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Figure 6. Previously unpublished thermal ionization–mass spectrometry (TIMS) and inductively coupled plasma–mass spectrometry (ICP-MS) U-Pb age data for an E–W transect at the lati-tude of Wrangell Island. (A) Zircon ages, (B) sphene ages, and (C) map showing sample locations for the ages reported here and in Tables 1 and 2; the plutons are color keyed to their ages as shown in Figure 5. The diagram numbers in Figures 6A and 6B correspond to location numbers in 6C. MSWD—mean square of weighted deviations.
4box heights are 2
box heights are 2
7 106
12
8
92
96
100
104
108WOR-1
ZIRCON = 93 ± 3 MaSPHENE = 92 ± 3 Ma
to ~974 Ma
0.017
0.015
0.095 0.115
206
238
Pb*
/ U
207 235Pb* / U
45
50
55
60
65
03WT102Age = 56.6 ± 1.9 Ma
Mean = 56.6 ± 0.9 Ma
MSWD = 0.54(2 )
Zircon
box heights are 1
13
5
WOR-2
ZIRCON = 88 ± 2 MaSPHENE = 88 ± 3 Ma
to ~1062 Ma
90
95
100
105
206
238
Pb*
/ U
207 235Pb* / U0.09 0.12
0.014
0.017
9
0.015
0.016
0.017
0.018
0.019
0.020
0.100 0.104 0.108 0.112 0.116 0.120 0.124 0.128 0.132
100
104
108
112
116
120
124Kell Bay granodiorite
115 ± 1.5 Ma
El Capitan granodiorite108 ± 1.5 Ma
Warren Island granodiorite111 ± 1.5 Ma
206 P
b*/23
8 U
207Pb*/ 235U
West of Wrangell
11
50
55
60
65
70
03WT107Age = 60.4 ± 1.9 Ma
Mean = 60.4 ± 0.7 Ma
MSWD = 0.68
(2 )
Zircon
box heights are 1
14
1
23
box heights are 2 box heights are 2
box heights are 2 box heights are 2 box heights are 2
A
2009156
DR p. 1
3
Figure 6. (Continued.)
2009156
DR p. 2
4
Figure 6. (Continued.)
°°
°
°
C
2009156
DR p. 3
Figure 7. Diagrams of previously unpublished thermal ionization–mass spectrometry (TIMS) and inductively coupled plasma–mass spec-trometry (ICP-MS) U-Pb age data for plutons of the Coast Plutonic Complex/Paleogene batholith. (A) Plutons emplaced across the batho-lith; (B) plutons emplaced along Pearse Canal. The diagram numbers of Figures 7A and 7B correspond to location numbers in Figure 8. MSWD—mean square of weighted deviations.
Geological Society of America Special Paper 456Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic ProcessesEdited by Robert B. Miller and Arthur W. Snoke
© 2009 The Geological Society of America
To accompany Chapter 4, “Mid-Cretaceous–Recent crustal evolution in the central Coast orogen, British Columbia and southeastern Alaska,” by Maria Luisa Crawford, Keith A. Klepeis, George E. Gehrels, and Jennifer Lindline
2009156
DR p. 4
Figure 7. (Continued.)
2009156
DR p. 5
Figure 8. Map showing the locations of dated samples shown in Figures 7 and 11, as well as in Tables 1 and 3–5. The plutons are color keyed to their ages as shown in Figure 5.
°°
°
°°
Geological Society of America Special Paper 456Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic ProcessesEdited by Robert B. Miller and Arthur W. Snoke
© 2009 The Geological Society of America
To accompany Chapter 4, “Mid-Cretaceous–Recent crustal evolution in the central Coast orogen, British Columbia and southeastern Alaska,” by Maria Luisa Crawford, Keith A. Klepeis, George E. Gehrels, and Jennifer Lindline
2009156
DR p. 6
Figure 11. (A–F) through ICP-MS (inductively coupled plasma–mass spectrometry) monazite ages of metamorphic rocks that host the plutons. The analytical data are presented in Table 3 and summarized in Table 1; the sample locations are in Figure 8. The reported ages are determined from the weighted mean (Ludwig, 2003) of the 208Pb/232Th ages. Analyses statistically excluded from the main cluster are shown in blue. Analyses from outer and inner portions of garnet crystals are shown with a green and red bars, respectively. Analyses from the same garnet crystal are indicated with a black bar. Two uncertainties are reported. The smaller uncertainty (labeled “Mean”) is based on the scatter and precision of the set of 208Pb/232Th ages, weighted according to their measurement errors (shown at 1σ). The larger uncertainty (labeled “Age”), which is the reported uncertainty of the age, is determined as the quadratic sum of the weighted mean error plus the total systematic error for the set of analyses. The systematic error, which includes contributions from the standard calibration, age of the calibration standard, composition of common Pb, and 238U decay constant, was 2% (2σ). (G) Line drawing of garnets from Coast Plutonic Complex gneiss collected between the Kasiks and Quottoon plutons showing the locations and ages of dated monazite inclusions.
2009156
DR p. 7
Figure 12. Diagrams of previously unpublished TIMS (thermal ionization–mass spectrometry) and ICP-MS (inductively coupled plasma–mass spectrometry) age data for Miocene plutons. The diagram numbers cor-respond to location numbers on Figure 8.
Geological Society of America Special Paper 456Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic ProcessesEdited by Robert B. Miller and Arthur W. Snoke
© 2009 The Geological Society of America
To accompany Chapter 4, “Mid-Cretaceous–Recent crustal evolution in the central Coast orogen, British Columbia and southeastern Alaska,” by Maria Luisa Crawford, Keith A. Klepeis, George E. Gehrels, and Jennifer Lindline
2009156
DR p. 8
1
TABLE 2A. WRANGELL TRANSECT: U-Pb (ZIRCON) GEOCHRONOLOGIC ANALYSES BY THERMAL IONIZATION MASS SPECTROMETRY
Apparent ages (Ma) Sample Wt.
(µg) Pbc
(pg) U
(ppm)
206Pbm 204Pb
206Pb 208Pb
206Pb* 238U
± 207Pb* 235U
± 207Pb* 206Pb*
±
Kell Bay Pluton (KP4) ZB-2 28 4 126 1530 8.3 115.9 1.2 117 1.5 139 19 ZE-6 16 3 181 859 6.9 113.5 1.5 113 2 111 31 ZD-3 18 18 407 1360 7.2 114.8 1.2 114 1.8 100 30 ZA-1 21 9 321 788 6.6 115.7 1.4 114 2.9 73 51 ZE-4 21 14 363 629 5.7 114.9 1.4 114 2.6 95 41 Warren Island (KP48) ZD-6 21 4 497 2740 11.2 112.2 1.0 113 1.4 125 16 ZD-5 22 9 618 1630 9.2 110.7 1.0 110 1.9 84 25 ZD-5 20 16 1219 1760 9.4 112.1 0.9 111 1.8 96 23 ZE-6 23 18 585 865 7.8 111.1 1.1 112 1.9 133 30 El Capitan Pluton (KP26) ZD-6 28 3 430 3640 8.8 107.9 0.9 108 1.5 113 22 ZB-2 31 6 357 2185 7.6 108.6 1.1 109 1.7 106 20 ZE-5 18 67 1398 420 6.1 108.0 1.1 107 3.5 83 65 ZE-5 16 9 1088 2260 8.5 110.7 1.0 112 2.2 140 33 ZE-5 17 10 938 1710 7.9 107.9 1.3 109 1.9 134 23 Grain size: A => 175µ, B = 145–175µ, C = 125–145µ, D = 100–125µ, E = 80–100µ, F = 63–80µ, G = 45–63µ. a = abraded. Sample Wt.
(µg) Pbc
(pg) U
(ppm)
206Pbm 204Pb
206Pb 208Pb
206Pb* 238U
± 207Pb* 235U
± 207Pb* 206Pb*
±
Woronkofski-1 ZG 9 936 1995 27.7 94.5 0.5 95.4 0.9 118 15 ZG 14 1054 9800 35.7 95.5 0.5 96.2 0.7 114 10 ZG 10 1760 11,700 37.7 96.8 0.5 98.6 0.6 141 8 ZF 160 1089 6550 27.2 102.4 0.4 108.0 0.7 233 13 ZF 185 628 5040 25.4 99.3 0.5 100.9 0.8 140 15 ZC 132 674 4790 34.4 98.6 0.5 100.1 0.9 138 16 ZB 210 518 271 6.1 97.8 0.7 99.4 3.6 138 78 ZB 184 322 1430 19.2 99.4 0.6 103.7 1 204 18 ZA 41 435 1610 20.5 103.2 0.7 108.7 1.4 230 23 SA 42 69 83 1.9 92.5 1.7 93.1 11 110 240 SA 49 42 79 1.8 91.1 1.8 90.6 12 76 260 Woronkofski-2 ZG 18 1998 10,550 39.5 88.3 0.6 88.7 0.8 98 10 ZG 21 1931 11,700 39.2 89.1 0.8 90.2 0.9 118 10 ZG 12 1248 8700 42.6 88.7 0.6 88.9 0.8 96 11 ZF 155 1371 11,550 42.9 88.7 0.6 89.2 0.7 102 8 ZC 185 1047 7600 28.9 97.2 0.5 101.7 0.7 209 10 ZB 205 856 1430 18.4 91.0 0.6 92.9 1.5 140 30 ZB 232 475 4680 24.3 104.7 0.7 114.8 1.1 329 15 SA 53 201 124 3.2 88.5 1.2 86.9 6 46 150 SA 48 129 122 3.1 88.5 1.2 88.7 6.1 97 150 Grain size: A => 175µ, B = 145–175µ, C = 125–145µ, D = 63–80µ, E = 45–63µ. Notes: All uncertainties are at the 95% confidence level. *—radiogenic Pb Z—zircon, S—Sphene Pbc—total common Pb in picograms 206Pbm/204Pb is measured ratio, uncorrected for spike, fractionation, or blank Pb. 206Pb/208Pb is corrected for blank, spike, fractionation, and initial Pb. Pb & U concentrations have uncertainties of up to 25% due to uncertainty in grain weight Constants used: 235U = 9.8485x10–10, 238U = 1.55125x10–10, 238U/235U = 137.88. In calculating U concentration and apparent ages, the isotope ratios are adjusted as follows:
(1) Mass dependent corrections factors of: 0.14 ± 0.06 %/AMU for Pb and 0.04 ± 0.04 %/AMU for UO2. (2) Pb ratios corrected for 0.010 ± 0.005 ng blank with 206Pb/204Pb = 18.6 ± 0.3, 207Pb/204Pb = 15.5 ± 0.3, and 208Pb/204Pb = 38.0 ±
0.8. (3) U has been adjusted for 0.001 ± 0.001 ng blank. (4) Initial Pb composition is from Stacey and Kramers (1975), with uncertainties of 2.0 for 206Pb/204Pb, 0.3 for 207Pb/204Pb, and 2.0
for 208Pb/204Pb. All analyses conducted using conventional isotope dilution and thermal ionization mass spectrometry, as described by Gehrels
(2000). Isotopic data were processed with programs of Ludwig (1991a, 1991b).
2009156
DR p. 9
2
TA
BLE
2B
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OL
OG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
S
PE
CT
RO
ME
TE
RY
Is
otop
ic r
atio
s
Ana
lysi
s U
(p
pm)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
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±
207 P
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±
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±
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A
2009156
DR p. 10
3
TA
BLE
2B
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OL
OG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
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LLE
CT
OR
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MA
SS
S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
Is
otop
ic r
atio
s
Ana
lysi
s U
(p
pm)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*
207 P
b*
±
RE
D B
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2.2
(Con
tinue
d )
)aM( sega tnerapp
A
2009156
DR p. 11
4
TA
BLE
2B
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OL
OG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
Is
otop
ic r
atio
s
Ana
lysi
s U
(p
pm)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*
207 P
b*
±
ZA
RE
MB
O E
AS
T (
Con
tinue
d )
ze
145
74,3
19
2.5
0.06
287
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741
8.8
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39
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36
7.9
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67
21
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2.
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429.
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103
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6.
9 –2
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164
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68
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8.
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12
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44
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6.
9 –2
40.9
11
0.4
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284
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241
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1.7
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7 58
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58
6 11
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55
9.8
WR
AN
GE
LL W
ES
T
ww
24
8 67
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33
91.0
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7 90
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10
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93
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2.7
71.0
5.
2 –6
18.5
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34
7 97
31
7.3
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401
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209
2.9
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89
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1.2
89.5
2.
7 82
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30.8
w
w
219
10,5
06
8.6
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349
0.8
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427
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0.18
86
.4
2.7
82.2
3.
8 –3
9.5
52.6
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w
187
9165
7.
9 0.
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0928
8 3.
9 0.
37
91.3
1.
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42
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44
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9 96
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24
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1.
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52
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32
0 14
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5.
5 0.
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7 0.
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20
90.5
2.
6 85
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3.1
–65.
5 41
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24
4 15
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9.
5 0.
0142
7 0.
7 0.
0919
4 3.
9 0.
19
91.3
2.
7 89
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3.6
36.2
45
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17
3 18
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7.
7 0.
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15
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2.
8 98
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119.
0 63
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21
3 13
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10
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0.01
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372
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0.21
86
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2.8
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3.
7 –6
2.4
51.6
w
w
200
3313
13
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1.8
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997
6.0
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9 6.
7 33
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w
369
21,5
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1.1
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782
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44
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6 18
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27
3 12
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8.
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33
5 26
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10
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560
1.3
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.8
1.3
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3.
8 84
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40.2
w
w
225
41,9
16
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527
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27
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7 10
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3 14
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31
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3 0.
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1 8.
1 0.
11
102.
8 0.
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8.8
138.
5 94
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23
8 48
34
25.6
0.
0150
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35
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2.
3 12
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9.0
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2 67
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16
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34
15.3
0.
0139
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9 4.
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19
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2.
8 87
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52
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25
7 14
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8.
4 0.
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2.
9 89
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2.9
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35
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ww
17
9 12
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9.
6 0.
0138
5 1.
0 0.
0851
2 4.
1 0.
25
88.6
2.
9 82
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3.5
–78.
3 48
.1
ww
24
8 17
,689
11
.6
0.01
457
1.4
0.09
395
3.2
0.43
93
.2
1.3
91.2
3.
0 37
.3
34.2
w
w
225
18,1
62
9.2
0.01
541
1.5
0.09
944
4.5
0.33
98
.6
1.5
96.3
4.
5 39
.7
51.0
w
w
230
13,2
05
11.7
0.
0146
4 1.
0 0.
0900
1 2.
9 0.
34
93.7
2.
9 87
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2.6
–77.
4 33
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ww
23
6 12
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11
.3
0.01
368
1.4
0.09
347
5.8
0.25
87
.6
1.3
90.7
5.
5 17
4.7
65.3
w
w
178
12,1
91
9.2
0.01
366
1.4
0.08
620
4.4
0.32
87
.5
1.2
84.0
3.
8 –1
4.8
50.3
w
w
162
10,7
85
9.9
0.01
579
1.9
0.10
515
6.3
0.30
10
1.0
2.0
101.
5 6.
7 11
4.0
71.1
w
w
208
11,6
57
15.2
0.
0145
7 1.
0 0.
1048
7 4.
3 0.
24
93.3
1.
0 10
1.3
4.6
293.
5 47
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BLA
KE
WE
ST
bw
17
46
10
.2
0.01
470
10.8
0.
6556
4 16
.9
0.64
94
.0
10.3
51
1.9
106.
5 35
86.9
99
.3
bw
94
135
6.6
0.01
368
1.0
0.13
909
3.9
0.26
87
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2.9
132.
2 5.
5 10
33.6
37
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bw
48
71
1.8
0.01
366
3.3
0.13
938
4.6
0.72
87
.4
2.9
132.
5 6.
5 10
41.9
32
.2
bw
30
56
8.3
0.01
330
2.7
0.21
068
7.0
0.39
85
.2
2.3
194.
1 14
.8
1877
.7
57.7
(C
ontin
ued
)
)aM( sega tnerapp
A
2009156
DR p. 12
5
TA
BLE
2B
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OL
OG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
Is
otop
ic r
atio
s
Ana
lysi
s U
(p
pm)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*
207 P
b*
±
BLA
KE
WE
ST
(C
ontin
ued
) bw
13
47
2.
2 0.
0130
9 6.
3 0.
3154
5 12
.0
0.53
83
.8
5.3
278.
4 37
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2604
.0
85.2
bw
81
14
3 4.
2 0.
0144
2 1.
1 0.
1201
5 4.
6 0.
23
92.3
4.
0 11
5.2
5.7
619.
3 48
.8
bw
82
131
3.5
0.01
308
0.7
0.09
356
13.2
0.
05
83.8
3.
6 90
.8
12.5
27
9.7
150.
9 bw
63
97
5.
9 0.
0138
5 0.
9 0.
2014
5 6.
9 0.
13
88.7
3.
8 18
6.4
14.0
17
22.8
62
.5
bw
63
101
9.6
0.01
440
1.3
0.24
229
3.3
0.38
92
.1
1.2
220.
3 8.
1 19
86.5
27
.2
bw
68
107
3.9
0.01
347
2.0
0.16
853
4.9
0.40
86
.2
1.7
158.
1 8.
4 14
41.4
42
.9
bw
136
94
1.9
0.01
447
1.0
0.29
139
2.9
0.35
92
.6
3.9
259.
7 8.
5 23
00.1
23
.2
bw
72
136
3.3
0.01
365
0.9
0.14
126
8.6
0.10
87
.4
3.8
134.
2 12
.3
1069
.7
85.9
B
LAK
E E
AS
T
be
248
3375
N
A
0.01
436
0.7
0.08
476
2.8
0.24
91
.9
5.3
82.6
2.
4 –1
78.3
34
.2
be
426
51,0
73
NA
0.
5502
9 0.
1 4.
1292
3 0.
8 0.
09
2826
.4
5.0
1660
.1
33.3
38
8.5
9.0
be
52
2440
N
A
0.01
727
3.5
0.10
069
18.2
0.
19
110.
4 7.
8 97
.4
18.4
–2
09.7
22
3.9
be
134
1121
N
A
0.01
365
0.7
0.23
369
3.1
0.23
87
.4
3.2
213.
2 7.
2 20
17.4
26
.4
be
92
808
NA
0.
0130
0 0.
7 0.
2346
2 3.
0 0.
25
83.3
5.
2 21
4.0
7.2
2109
.3
25.7
be
99
91
8 N
A
0.01
451
0.9
0.23
898
3.3
0.26
92
.8
7.6
217.
6 7.
9 19
48.4
28
.3
be
435
82,7
07
NA
0.
0555
4 0.
6 0.
4142
5 1.
1 0.
56
348.
4 4.
5 35
1.9
4.7
375.
0 10
.4
be
492
18,0
52
NA
0.
0149
2 0.
7 0.
1045
9 2.
2 0.
33
95.5
5.
4 10
1.0
2.3
233.
7 23
.8
be
80
775
NA
0.
0145
3 1.
1 0.
2485
2 4.
0 0.
28
93.0
2.
1 22
5.4
10.2
20
15.2
34
.5
be
66
750
NA
0.
0156
1 1.
8 0.
2660
1 4.
7 0.
39
99.8
3.
7 23
9.5
12.7
20
08.8
38
.9
be
159
863
NA
0.
0136
3 2.
2 0.
2335
2 3.
0 0.
75
87.3
3.
9 21
3.1
7.0
2018
.0
17.3
be
52
48
5 N
A
0.01
478
0.9
0.42
052
5.1
0.18
94
.6
5.7
356.
4 21
.6
2877
.3
40.9
be
41
42
5 N
A
0.01
530
1.4
0.41
134
3.0
0.48
97
.9
2.8
349.
8 12
.5
2784
.3
21.6
be
16
4 12
85
NA
0.
0141
5 0.
5 0.
1978
5 2.
4 0.
21
90.6
4.
9 18
3.3
4.7
1650
.4
21.4
be
10
66
98,5
90
NA
0.
0467
9 1.
1 0.
3495
2 1.
4 0.
76
294.
8 6.
6 30
4.4
5.1
378.
2 10
.5
be
316
12,5
63
NA
0.
0178
0 0.
8 0.
1250
4 2.
1 0.
37
113.
7 1.
8 11
9.6
2.6
238.
7 22
.0
be
414
14,9
44
NA
0.
0184
0 1.
5 0.
1373
5 3.
1 0.
48
117.
5 3.
5 13
0.7
4.3
377.
5 30
.2
be
447
10,8
89
NA
0.
0153
6 1.
5 0.
1257
4 3.
3 0.
46
98.2
3.
0 12
0.3
4.3
581.
5 32
.1
be
350
7563
N
A
0.01
473
1.6
0.10
085
6.3
0.26
94
.3
3.1
97.6
6.
4 17
8.1
70.9
be
12
39
14,9
47
NA
0.
0137
8 1.
0 0.
1065
4 1.
9 0.
51
88.2
7.
7 10
2.8
2.1
454.
7 18
.3
be
43
402
NA
0.
0144
1 1.
4 0.
2915
8 4.
4 0.
32
92.2
2.
6 25
9.8
12.9
23
08.5
35
.6
be
80
4393
N
A
0.01
453
1.7
0.08
948
20.2
0.
09
93.0
3.
2 87
.0
18.2
–7
3.2
245.
7 be
98
86
21
NA
0.
0146
5 0.
7 0.
0888
0 13
.4
0.05
93
.8
7.3
86.4
12
.0
–113
.6
164.
9 03
WT
102
1C
587
693
1.4
0.07
919
28.8
0.
0081
3 4.
2 0.
15
52.2
2.
2 77
.4
22.9
94
7.7
291.
8 2C
32
6 52
2 2.
1 0.
0988
4 32
.5
0.00
880
2.8
0.09
56
.5
1.6
95.7
32
.1
1232
.9
317.
6 3C
28
5 38
4 2.
2 0.
0410
7 67
.8
0.00
839
6.4
0.09
53
.9
3.5
40.9
27
.9
–669
.9
930.
8 4C
32
5 48
9 2.
1 0.
0732
0 52
.1
0.00
895
5.9
0.11
57
.4
3.4
71.7
38
.0
579.
2 56
2.0
5T
213
333
2.7
0.07
676
42.4
0.
0092
8 4.
7 0.
11
59.5
2.
8 75
.1
32.6
60
4.1
456.
3 6T
47
6 67
5 1.
5 0.
0661
9 49
.0
0.00
910
3.3
0.07
58
.4
2.0
65.1
32
.4
318.
2 55
5.3
7 19
2 62
1 2.
4 0.
0416
8 37
.4
0.00
871
7.2
0.19
55
.9
4.0
41.5
15
.7
–733
.2
513.
1 8C
45
1 97
5 2.
3 0.
0957
2 31
.8
0.00
884
4.9
0.15
56
.7
2.8
92.8
30
.4
1160
.4
311.
2 9C
22
2 43
8 2.
7 0.
0464
1 55
.5
0.00
870
4.8
0.09
55
.8
2.7
46.1
25
.8
–436
.9
726.
7 (C
ontin
ued
)
)aM( sega tnerapp
A
2009156
DR p. 13
6T
AB
LE 2
B. W
RA
NG
ELL
TR
AN
SE
CT
: U-P
b (Z
IRC
ON
) G
EO
CH
RO
NO
LO
GIC
AN
ALY
SE
S B
Y L
AS
ER
-AB
LAT
ION
MU
LTIC
OLL
EC
TO
R IC
P M
AS
S
SP
EC
TR
OM
ET
ER
Y (
Con
tinue
d )
Is
otop
ic r
atio
s
Ana
lysi
s U
(p
pm)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*
207 P
b*
±
03W
T10
2 (C
ontin
ued )
10T
29
4 41
7 2.
4 0.
0456
1 47
.3
0.00
891
3.6
0.08
57
.2
2.1
45.3
21
.7
–548
.4
634.
1 11
T
412
570
2.5
0.07
390
31.8
0.
0087
4 1.
3 0.
04
56.1
0.
7 72
.4
23.6
64
9.8
341.
1 12
T
173
114
2.6
0.50
358
19.8
0.
0127
5 6.
3 0.
32
81.6
5.
2 41
4.1
96.3
33
98.9
14
5.9
13T
35
2 57
9 1.
8 0.
0723
4 40
.2
0.00
876
4.1
0.10
56
.2
2.3
70.9
29
.1
599.
9 43
3.4
14T
96
1 56
37
2.2
0.21
161
8.2
0.02
723
2.3
0.28
17
3.2
4.1
194.
9 17
.5
466.
5 87
.4
15T
17
9 34
5 2.
6 0.
0366
1 77
.7
0.00
923
5.6
0.07
59
.2
3.3
36.5
28
.5
–128
8.0
1226
.3
16T
20
5 31
8 2.
1 0.
0554
9 69
.4
0.00
907
6.4
0.09
58
.2
3.8
54.8
38
.4
–89.
6 84
7.1
17T
23
2 39
9 2.
4 0.
0626
3 79
.4
0.00
892
6.0
0.08
57
.3
3.5
61.7
49
.3
236.
5 91
3.4
18T
26
2 79
8 2.
2 0.
0345
3 10
2.3
0.00
872
3.8
0.04
56
.0
2.1
34.5
35
.3
–129
6.0
1621
.2
19T
25
3 48
3 1.
7 0.
0607
9 48
.4
0.00
885
12.0
0.
25
56.8
6.
8 59
.9
29.5
18
6.4
546.
3 20
T
419
990
2.1
0.08
949
124.
5 0.
0093
4 5.
0 0.
04
59.9
3.
0 87
.0
107.
3 91
4.1
1280
.1
21T
17
7 36
9 2.
6 0.
0798
3 58
.9
0.00
903
9.4
0.16
58
.0
5.5
78.0
46
.7
744.
3 61
4.6
22T
26
8 46
5 2.
3 0.
0873
1 60
.4
0.00
903
7.2
0.12
58
.0
4.2
85.0
52
.2
931.
7 61
5.1
23T
22
2 38
1 2.
1 0.
0838
3 55
.4
0.00
899
7.4
0.13
57
.7
4.3
81.7
46
.1
856.
7 56
9.8
24T
34
4 51
6 2.
1 0.
1249
7 22
.3
0.00
913
3.5
0.15
58
.6
2.0
119.
6 27
.9
1611
.5
204.
9 03
WT
107
1T
457
963
2.7
0.06
984
45.6
0.
0093
5 1.
8 0.
04
60.0
1.
1 68
.6
31.9
37
7.4
512.
9 2T
67
2 15
36
1.7
0.07
637
22.4
0.
0095
4 2.
5 0.
11
61.2
1.
5 74
.7
17.2
53
1.0
243.
5 3T
73
6 13
80
2.7
0.08
024
17.0
0.
0096
5 3.
0 0.
18
61.9
1.
8 78
.4
13.7
61
4.9
180.
2 4T
47
9 66
9 2.
8 0.
0782
5 21
.4
0.00
922
2.9
0.13
59
.2
1.7
76.5
16
.9
658.
8 22
7.6
5T
430
996
2.5
0.09
475
39.0
0.
0098
0 3.
1 0.
08
62.9
2.
0 91
.9
36.8
93
1.8
398.
9 6T
39
3 83
4 1.
8 0.
0908
2 20
.9
0.00
949
3.6
0.17
60
.9
2.2
88.3
19
.1
911.
9 21
2.2
7T
292
696
2.7
0.04
409
68.7
0.
0095
9 4.
7 0.
07
61.5
2.
9 43
.8
30.3
–8
46.4
98
2.2
8T
531
1254
3.
2 0.
0915
4 17
.7
0.00
941
1.4
0.08
60
.4
0.8
88.9
16
.4
943.
4 18
1.2
9T
540
1113
3.
1 0.
0882
6 20
.8
0.00
942
1.4
0.07
60
.4
0.9
85.9
18
.5
867.
2 21
5.5
10T
89
5 22
56
2.9
0.07
630
11.6
0.
0095
8 3.
8 0.
33
61.5
2.
4 74
.7
8.9
520.
1 11
9.7
11T
20
6 54
6 3.
9 0.
1318
8 25
.3
0.00
912
8.3
0.33
58
.5
4.9
125.
8 33
.3
1712
.7
219.
5 12
T
587
1161
2.
5 0.
0866
7 40
.1
0.00
932
7.1
0.18
59
.8
4.3
84.4
34
.7
850.
9 41
0.0
13T
60
6 15
33
3.3
0.10
151
17.6
0.
0102
2 5.
7 0.
33
65.6
3.
8 98
.2
18.0
98
6.9
169.
4 14
T
537
1512
2.
5 0.
0822
5 33
.5
0.00
939
3.7
0.11
60
.3
2.3
80.3
27
.6
725.
1 35
3.5
15T
46
0 10
05
3.1
0.06
506
30.5
0.
0090
1 2.
3 0.
08
57.8
1.
4 64
.0
20.0
30
2.5
346.
8 16
T
237
714
4.0
0.10
674
63.1
0.
0092
7 8.
0 0.
13
59.5
4.
8 10
3.0
66.2
12
80.7
61
0.4
17T
29
9 88
5 2.
5 0.
0709
3 52
.1
0.01
000
5.3
0.10
64
.2
3.4
69.6
36
.9
260.
0 59
5.6
18T
49
5 15
72
2.2
0.08
747
33.6
0.
0092
9 2.
8 0.
08
59.6
1.
7 85
.1
29.4
87
7.2
346.
7 19
T
418
873
2.7
0.06
912
38.4
0.
0097
7 4.
3 0.
11
62.7
2.
7 67
.9
26.6
25
4.9
438.
3 20
T
667
1482
2.
8 0.
0685
4 26
.7
0.00
930
2.9
0.11
59
.7
1.7
67.3
18
.4
347.
7 29
9.9
21T
68
7 23
34
2.9
0.04
525
46.3
0.
0096
3 3.
4 0.
07
61.8
2.
1 44
.9
21.1
–7
82.6
65
2.8
22T
52
4 16
47
3.5
0.06
596
41.6
0.
0096
1 3.
9 0.
09
61.6
2.
4 64
.9
27.5
18
5.8
482.
5 23
T
511
1287
3.
4 0.
0809
9 34
.8
0.00
901
2.5
0.07
57
.8
1.4
79.1
28
.2
779.
6 36
4.7
24T
62
6 19
20
2.8
0.09
627
39.7
0.
0094
6 1.
7 0.
04
60.7
1.
0 93
.3
38.1
10
36.9
40
0.7
20
6 Pb/
204 P
b is
mea
sure
d ra
tio. I
CP
—in
duct
ivel
y co
uple
d pl
asm
a.
All
unce
rtai
ntie
s ar
e at
the
1-σ
leve
l, an
d in
clud
e on
ly m
easu
rem
ent e
rror
s.
U
con
cent
ratio
n an
d U
/Th
have
unc
erta
intie
s of
~25
%.
D
ecay
con
stan
ts: 23
5 U =
9.8
485×
10–1
0 , 238
U =
1.5
5125
×10
–10 , 23
8 U/23
5 U =
137
.88.
Isot
ope
ratio
s ar
e co
rrec
ted
for
Pb/
U fr
actio
natio
n by
com
paris
on w
ith s
tand
ard
zirc
on w
ith a
n ag
e of
564
± 4
Ma.
Initi
al P
b co
mpo
sitio
n in
terp
rete
d fr
om S
tace
y an
d K
ram
ers
(197
5), w
ith u
ncer
tain
ties
of 1
.0 fo
r 20
6 Pb/
204 P
b an
d 0.
3 fo
r 20
7 Pb/
204 P
b.
)aM( sega tnerapp
A
Not
es:
2009156
DR p. 14
7
TA
BLE
2C
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(SP
HE
NE
) G
EO
CH
RO
NO
LOG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
S
PE
CT
RO
ME
TE
RY
)aM( sega tnerapp
A soitar cipotosI
A
naly
sis
U
(ppm
)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*23
5 U
±20
6 Pb*
207 P
b*
±
ZA
RE
MB
O E
AS
T
ZE
-1
21
55
7.0
0.01
309
2.0
–0.1
4322
13
.3
0.15
83
.8
1.7
NA
N
A
NA
N
A
ZE
-2
28
96
4.0
0.01
459
1.6
–0.0
3301
18
.1
0.09
93
.4
1.5
NA
N
A
NA
N
A
ZE
-3
23
84
4.9
0.01
418
2.2
–0.0
1406
10
7.5
0.02
90
.8
2.0
NA
N
A
NA
N
A
ZE
-4
16
57
9.4
0.01
534
2.4
0.21
057
10.4
0.
23
98.2
2.
3 N
A
NA
N
A
NA
Z
E-5
21
71
6.
6 0.
0141
8 2.
2 0.
0132
3 92
.1
0.02
90
.8
2.0
NA
N
A
NA
N
A
ZE
-6
16
76
5.6
0.01
380
1.5
–0.0
3864
33
.6
0.05
88
.3
1.4
NA
N
A
NA
N
A
ZE
-7
23
93
4.0
0.01
477
1.9
0.07
454
12.1
0.
15
94.5
1.
8 N
A
NA
N
A
NA
Z
E-8
25
95
4.
4 0.
0137
9 2.
6 0.
0120
4 77
.0
0.03
88
.3
2.3
NA
N
A
NA
N
A
ZE
-9
28
107
3.4
0.01
476
1.8
0.01
079
70.1
0.
03
94.4
1.
7 N
A
NA
N
A
NA
B
LAK
E W
ES
T
BW
-1
15
49
9.4
0.01
358
2.7
–0.0
2442
69
.8
0.04
87
.0
2.3
NA
N
A
NA
N
A
BW
-3
45
118
1.5
0.01
466
1.0
0.13
280
4.7
0.21
93
.8
3.9
NA
N
A
NA
N
A
BW
-4
58
164
8.9
0.01
459
1.2
0.12
350
6.3
0.20
93
.4
2.2
NA
N
A
NA
N
A
BW
-5
28
80
3.0
0.01
419
1.3
0.14
788
8.5
0.16
90
.8
2.2
NA
N
A
NA
N
A
BW
-6
52
137
1.7
0.01
395
0.8
0.16
614
4.4
0.19
89
.3
2.7
NA
N
A
NA
N
A
BW
-7
93
199
6.1
0.01
346
2.2
0.16
592
6.7
0.32
86
.2
2.9
NA
N
A
NA
N
A
BW
-8
48
113
2.3
0.01
386
1.1
0.13
074
6.3
0.17
88
.8
3.9
NA
N
A
NA
N
A
BW
-9
43
162
2.1
0.01
476
1.5
0.17
445
5.5
0.27
94
.5
2.4
NA
N
A
NA
N
A
BLA
KE
EA
ST
BE
-1
26
63
1.3
0.01
220
2.2
–0.1
4327
11
.7
0.19
78
.2
1.7
NA
N
A
NA
N
A
BE
-2
20
61
1.8
0.01
298
1.9
–0.1
5790
13
.2
0.15
83
.2
1.6
NA
N
A
NA
N
A
BE
-3
56
108
1.1
0.01
467
1.2
0.13
134
5.8
0.22
93
.9
1.2
NA
N
A
NA
N
A
BE
-4
25
77
2.3
0.01
303
2.1
–0.0
6041
16
.1
0.13
83
.5
1.8
NA
N
A
NA
N
A
BE
-5
26
80
1.4
0.01
276
1.4
–0.0
3277
20
.9
0.07
81
.7
1.2
NA
N
A
NA
N
A
BE
-6
36
105
9.9
0.01
370
1.3
0.02
728
21.8
0.
06
87.7
1.
1 N
A
NA
N
A
NA
B
E-7
29
88
1.
1 0.
0138
8 1.
2 0.
0561
1 12
.7
0.10
88
.9
1.1
NA
N
A
NA
N
A
BE
-8
19
63
7.8
0.01
225
2.8
–0.1
0063
17
.9
0.15
78
.5
2.2
NA
N
A
NA
N
A
BE
-9
21
87
6.2
0.01
444
2.2
–0.0
0247
32
1.4
0.01
92
.4
2.0
NA
N
A
NA
N
A
03W
T10
2
S-1
34
0 72
0.
5 0.
0453
6 72
.6
0.00
794
3.0
0.04
51
.0
1.5
NA
N
A
NA
N
A
S-2
49
6 13
0 0.
4 0.
0619
8 57
.7
0.00
813
2.7
0.05
52
.2
1.4
NA
N
A
NA
N
A
S-3
53
4 15
8 1.
8 0.
0146
8 85
.5
0.00
836
3.3
0.04
53
.7
1.8
NA
N
A
NA
N
A
S-4
19
9 80
0.
6 –0
.023
56
124.
8 0.
0080
3 3.
0 0.
02
51.5
1.
6 N
A
NA
N
A
NA
S
-5
916
197
1.6
0.04
821
55.2
0.
0076
5 3.
3 0.
06
49.2
1.
6 N
A
NA
N
A
NA
S
-6
1170
15
4 1.
7 0.
0499
5 58
.3
0.00
776
2.7
0.05
49
.9
1.4
NA
N
A
NA
N
A
S-7
22
8 79
0.
6 –0
.006
85
107.
1 0.
0079
4 7.
4 0.
07
51.0
3.
8 N
A
NA
N
A
NA
S
-8
313
91
0.6
0.00
773
93.5
0.
0077
9 3.
1 0.
03
50.0
1.
6 N
A
NA
N
A
NA
S
-9
224
65
0.3
0.04
726
72.9
0.
0080
1 6.
3 0.
09
51.4
3.
2 N
A
NA
N
A
NA
S
-10
830
170
1.6
0.04
335
60.6
0.
0080
9 3.
2 0.
05
51.9
1.
6 N
A
NA
N
A
NA
(C
ontin
ued
)
2009156
DR p. 15
8
TA
BLE
2C
. WR
AN
GE
LL T
RA
NS
EC
T: U
-Pb
(SP
HE
NE
) G
EO
CH
RO
NO
LOG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
)aM( sega tnerapp
A soitar cipotosI
A
naly
sis
U
(ppm
)
206 P
b 20
4 Pb
U
Th
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
206 P
b*
238 U
±
207 P
b*23
5 U
±20
6 Pb*
207 P
b*
±
03W
T10
7
S-1
33
33
3.
6 0.
0035
9 10
5.3
0.00
919
29.4
0.
28
59.0
17
.4
NA
N
A
NA
N
A
S-2
25
9 10
0 15
.6
0.02
658
80.1
0.
0083
0 9.
2 0.
11
53.3
4.
9 N
A
NA
N
A
NA
S
-3
195
85
8.6
0.00
878
94.4
0.
0082
2 13
.8
0.15
52
.7
7.3
NA
N
A
NA
N
A
S-4
25
6 96
4.
8 0.
0506
3 69
.2
0.00
852
6.4
0.09
54
.7
3.5
NA
N
A
NA
N
A
S-5
50
8 14
1 8.
9 0.
0419
7 66
.4
0.00
841
4.7
0.07
54
.0
2.6
NA
N
A
NA
N
A
S-6
76
7 15
0 9.
9 0.
0219
0 78
.0
0.00
823
3.3
0.04
52
.8
1.7
NA
N
A
NA
N
A
S-7
16
8 52
7.
9 0.
0154
5 91
.0
0.00
793
4.6
0.05
50
.9
2.3
NA
N
A
NA
N
A
S-8
22
4 78
6.
7 0.
0103
6 93
.3
0.00
833
10.8
0.
12
53.5
5.
8 N
A
NA
N
A
NA
S
-9
282
81
3.0
–0.0
1198
11
2.5
0.00
836
3.4
0.03
53
.6
1.8
NA
N
A
NA
N
A
S-1
0 25
5 86
7.
8 0.
0287
7 80
.0
0.00
809
9.5
0.12
51
.9
5.0
NA
N
A
NA
N
A
N
otes
: IC
P—
indu
ctiv
ely
coup
led
plas
ma;
NA
—da
ta n
ot a
vaila
ble.
See
Tab
le 2
B fo
r ex
plan
atio
n of
oth
er d
ata.
2009156
DR p. 16
9
TABLE 3. Pb/Th AGES OF MONAZITE INCLUSIONS IN GARNET CRYSTALS
Sample Th (ppm)
208Pb 204Pb
208Pb 232Th
±(%)
208Pb Age 232Th (Ma)
±(Ma)
97-134-1A 1323 454 0.00379 3.5 76.4 2.7
92-34-1 839 800 0.00468 3.7 94.4 3.5
97-27-2 1383 712 0.00279 3.4 56.4 1.9 -3A 4424 469 0.00267 2.2 53.8 1.2 -3B 4020 459 0.00271 3.1 54.6 1.7 -3C 4045 468 0.00272 4.1 54.9 2.2 -4 2930 640 0.00280 4.5 56.6 2.5 -9A 4300 439 0.00271 2.3 54.7 1.3 -9B 4898 490 0.00275 2.6 55.5 1.5 -6 2477 378 0.00282 6.7 57.0 3.8 -7 281 306 0.00252 5.7 50.8 2.9
90-157B-1 67 687 0.00449 8.4 90.5 7.6 -2 2169 886 0.00442 4.2 89.2 3.7 -2B 3969 762 0.00440 1.8 88.7 1.6 -2C 2122 862 0.00438 4.3 88.3 3.8 -3 1828 754 0.00439 3.4 88.6 3.0 -4 1179 568 0.00432 4.0 87.2 3.5 -5 3333 658 0.00456 2.0 92.0 1.8 -6 1687 696 0.00468 8.3 94.3 7.9 -7 3024 657 0.00497 2.6 100.1 2.6 -8 1195 423 0.00453 5.1 91.3 4.6 -9 3931 1146 0.00456 3.1 91.9 2.9 -10 3659 751 0.00434 2.0 87.5 1.8 -11A 3638 562 0.00448 1.9 90.4 1.7 -11B 4747 643 0.00451 1.5 91.0 1.4 -12 3655 488 0.00456 2.7 91.9 2.5 -12B 209 285 0.00391 9.3 78.9 7.4 -13 1951 457 0.00450 5.4 90.8 4.9
90-157A-1 1239 493 0.00370 4.5 74.7 3.4 -2 1791 476 0.00341 2.6 68.8 1.8 -3 4894 621 0.00298 1.7 60.2 1.0 -5 858 759 0.00306 12.6 61.7 7.8 -6 364 580 0.00376 10.9 75.9 8.3 -10A 4126 551 0.00332 1.8 66.9 1.2 -10B 2685 497 0.00330 4.4 66.5 3.0 -11A 2055 224 0.00305 3.9 61.5 2.4 -11B 2008 411 0.00294 3.6 59.3 2.1 -11C 4403 420 0.00297 2.2 59.9 1.3 -12 3815 567 0.00335 1.6 67.6 1.1 -13 594 545 0.00321 2.5 64.8 1.6 -14 5310 495 0.00323 2.1 65.2 1.4 -15 6827 810 0.00326 2.3 65.7 1.5 -16A 3075 353 0.00327 3.6 66.0 2.4 -16B 3219 347 0.00336 2.9 67.8 2.0 -17 3702 477 0.00310 1.8 62.5 1.1 -18A 2279 294 0.00309 2.7 62.3 1.7 -18B 3072 425 0.00310 2.8 62.6 1.8 -19 1905 620 0.00324 4.0 65.4 2.6 -20 1453 529 0.00308 6.0 62.2 3.7 -21A 2444 474 0.00301 2.4 60.7 1.4 -21B 3513 427 0.00330 8.6 66.6 5.8 -24 1575 512 0.00324 8.5 65.3 5.6 -25A 2405 782 0.00317 4.9 64.0 3.2 -25B 3234 794 0.00311 6.5 62.7 4.1 -26A 4074 467 0.00299 1.1 60.4 0.7 -26B 3321 362 0.00309 2.5 62.3 1.6 -26C 3083 396 0.00299 3.8 60.3 2.3 -27 3023 494 0.00302 3.8 60.9 2.3 -28A 1129 551 0.00340 8.5 68.6 5.9 -28B 759 555 0.00323 5.8 65.2 3.8 -29 1534 394 0.00292 3.7 59.0 2.2
(Continued )
2009156
DR p. 17
10
TABLE 3. Pb/Th AGES OF MONAZITE INCLUSIONS IN GARNET CRYSTALS (Continued )
Sample Th (ppm)
208Pb 204Pb
208Pb 232Th
±(%)
208Pb Age232Th (Ma)
±(Ma)
-30 2550 227 0.00301 3.2 60.8 2.0 -31 1687 268 0.00320 4.0 64.7 2.6 -32A 4685 461 0.00311 2.9 62.8 1.9 -32B 4291 373 0.00300 2.6 60.5 1.6 -33A 4149 556 0.00316 6.6 63.8 4.2 -33B 6463 580 0.00313 1.9 63.2 1.2 -33C 6840 557 0.00299 2.7 60.4 1.6
86-113-1 2331 490 0.00442 2.5 89.1 2.3 -2 184 960 0.00585 5.8 118.0 6.8 -6 1161 376 0.00424 7.5 85.5 6.4 -11 93 420 0.00440 3.8 88.7 3.4 -14 409 590 0.00445 2.8 89.7 2.5 -16 808 520 0.00433 4.0 87.3 3.5 -18 618 522 0.00436 2.5 87.9 2.2 -21 244 480 0.00453 9.4 91.3 8.6 -23 1532 616 0.00404 5.1 81.6 4.2 -24 167 331 0.00446 13.2 89.9 11.9 -25 1561 568 0.00426 14.1 85.9 12.1 Notes: All uncertainties are reported at the 1-sigma level, and include only measurement errors. U concentration and U/Th are calibrated relative to NIST SRM 610 and are accurate to ~20%. Common Pb correction is from 204Pb, with composition interpreted from Stacey and Kramers (1975) and uncertainties of 2.0 for 208Pb/204Pb. 208Pb/232Th fractionation is calibrated relative to standard monazite 44069 (Aleinikoff et al., 2006). Th decay constant for 232Th = 4.9475 E–11.
2009156
DR p. 18
11
TABLE 4A. PALEOGENE BATHOLITH. U-Pb (ZIRCON) GEOCHRONOLOGIC ANALYSES BY THERMAL IONIZATION MASS SPECTROMETRY
Apparent ages (Ma) Sample Wt.
(µg) Pbc
(pg) U
(ppm)
206Pbm 204Pb
206Pb 208Pb
206Pb*238U
± 207Pb* 235U
± 207Pb* 206Pb*
±
98-148 ZAa-1 21 1 169 1280 13 194 1 194 1.7 191 21 ZAa-1 19 2 209 1085 10 192.8 1 193 1.6 196 23 ZAa-1 24 1 88 670 11 193.4 2 194 2.8 197 37 ZA-6 180 35 413 3250 15 175.5 1 177 0.7 192 14 ZB-15 165 23 432 4409 17 174.1 1 175 0.9 191 17 ZB-15 152 25 557 4702 15 168.3 1 170 0.9 189 16 ZE-30 110 21 1838 12,426 16 160.5 1 162 0.7 189 8 Hidden (98-87) ZAa-1 32 3 691 7560 9 186.2 1 187 0.7 189 12 ZAa-1 34 8 641 2994 10 176.9 1 179 0.8 206 14 ZAa-1 24 5 321 2296 12 156.6 1 158 1.2 180 18 ZAa-1 27 14 1133 2708 8 167.5 1 169 0.9 182 16 ZA-1 29 5 1049 4997 11 166.5 1 167 0.7 173 10 ZA-1 45 16 386 1275 10 155.6 1 156 1.1 161 20 ZA-1 41 13 1445 3633 14 113 1 114 0.8 136 12 94-36 ZA-1 15 18 1250 1505 6 65.2 1 65 1.3 74 29 ZA-1 14 11 391 43,800 13 81.4 1 83 0.8 113 16 ZA-1 20 15 1473 15,500 13 88.8 1 90 0.7 121 11 ZA-1 18 9 967 12,600 16 79 1 83 0.6 208 10 ZA-1 14 17 1085 2820 6 126.6 1 132 1.2 234 12 ZA-1 12 38 650 2900 16.5 82.09 0.5 88.3 0.6 258.0 13 ZA-1 17 24 1481 13,300 5.6 209.9 1.5 218.3 1.7 310.0 8 ZB-10 180 32 741 4780 12.8 80 0.4 81.5 0.6 124.0 13 ZB-10 165 20 695 14,280 11.7 89.1 0.4 92.3 0.5 177.0 18 ZD-20 140 19 276 3190 12.1 78.9 0.6 82.9 0.9 201.0 18 ZE-30 168 16 275 6190 13.1 82.1 0.5 87.4 0.8 233.0 16 ZF-30 90 30 877 3050 10.5 76.4 0.4 76.8 0.6 90.0 15 95-114 ZA-6 24 52 548 2070 10.1 65.8 1 64.4 0.9 12.0 30 ZB-10 180 29 494 3080 11.3 65.7 0.7 65.7 1.1 62.0 25 ZE-20 164 16 222 4600 10.5 65.7 0.6 65.7 1.0 65.0 26 ZG-30 86 24 375 2770 11.5 65.3 0.5 65.2 1.0 61.0 29 95-130 ZA-6 187 41 885 3610 12 63.2 0 63 0.7 54 20 ZB-10 146 25 850 7190 12 63.3 0 63 0.6 60 16 ZD-20 190 70 1164 1960 11 63.3 0 63 0.9 66 29 ZF-30 135 23 914 7960 12 63.2 0 63 0.6 60 16 98-23 Zaa-1 32 9 2791 5606 42 58.5 0 59 0.7 72 14 Zaa-1 28 7 5278 12,510 30 58.5 1 59 0.7 70 8 Zaa-1 31 8 6559 13,306 30 54.7 1 55 0.6 60 7 Zaa-1 34 11 3375 5685 27 55.5 1 56 0.8 64 15 Zaa-1 29 14 1060 2630 12 115.5 1 117 0.8 137 15 ZA-7 195 30 4868 15,052 39 55.4 2 56 1.6 67 7 ZC-15 142 46 7614 11,909 53 57 2 58 1.7 68 8 ZC-15 155 34 2318 5958 20 67 1 68 1.1 96 15 ZF-30 80 21 3291 6882 20 67.5 1 68 0.7 89 12 Getukti (97-46) ZA-1 95 7 336 2220 38 52 0 52 0.6 62 20 ZA-1 52 15 1180 2050 11 51.4 0 51 0.6 44 24 ZA-1 36 16 762 875 9 51.3 1 52 0.9 59 34 ZB-5 242 39 809 2630 9 52.4 0 53 0.5 66 16 ZB-5 140 20 747 2680 10 51.4 0 52 0.5 60 18 ZD-20 155 41 2425 5680 8 62 0 65 0.6 190 14 ZD-20 165 20 1396 7600 7 66.7 1 68 0.6 106 11 ZF-50 240 23 443 2850 7 61.9 0 64 0.6 153 15 Rousseau (97-123) ZA-1 24 8 1195 2117 12 59 0 59 0.4 69 23 ZA-1 29 8 610 1215 13 55 0 55 0.6 73 34 ZA-1 24 10 942 1192 11.4 54.9 0.4 55 0.6 63 40 ZA-1 36 11 591 1042 13.5 54.2 0.4 54 0.6 63 44 ZA-1 34 4 523 2167 15 53 1 54 1.1 57 64 ZA-1 44 7 668 2254 14 53 1 53 0.5 52 14 ZA-1 35 10 704 1272 13 53 0 53 1.1 55 99 ZA-1 25 5 1236 3002 14 53 0 53 0.5 56 33 SA-8 482 2040 29 59 1 52.7 4 47 14 –222 285
(Continued )
2009156
DR p. 19
12
TABLE 4A. PALEOGENE BATHOLITH. U-Pb (ZIRCON) GEOCHRONOLOGIC ANALYSES BY THERMAL IONIZATION MASS
SPECTROMETRY (Continued )
Apparent ages (Ma) Sample Wt.
(µg) Pbc
(pg) U
(ppm)
206Pbm 204Pb
206Pb 208Pb
206Pb*238U
± 207Pb* 235U
± 207Pb* 206Pb*
±
Halibut (98-42) ZA-1 119 34 684 1243 12 51.9 1 52 0.8 61 38 ZA-1 87 13 712 2376 14 51.8 0 52 0.4 49 26 ZA-1 53 9 1101 3329 15 51.4 0 52 0.4 55 28 ZA-1 64 12 942 2694 14 51.3 2 51 2.2 43 148 ZA-1 53 8 382 1301 19 51.3 1 51 0.7 40 72 SA-11 500 850 23 78 1 51.5 2 51 12 –36 280 SA-10 468 1600 36 78 1 51.2 2 50 13 –138 290 Notes: Grain size: A => 175µ, B = 145–175µ, C = 125–145µ, D = 100–125µ, E = 80–100µ, F = 63–80µ, G = 45–63µ. a = abraded. See Table 2A for explanation of other data.
2009156
DR p. 20
13
TA
BLE
4B
. PA
LEO
GE
NE
BA
TH
OLI
TH
. U-P
B (
ZIR
CO
N)
GE
OC
HR
ON
OLO
GIC
AN
ALY
SE
S B
Y L
AS
ER
-AB
LAT
ION
MU
LTIC
OLL
EC
TO
R
ICP
MA
SS
SP
EC
TR
OM
ET
ER
Y
)aM( sega tnerapp
A soitar cipotosI
A
naly
sis
(ppm
)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) E
rror
co
rr.
206 P
b*
238 U
±
207 P
b*23
5 U
±20
6 Pb*
20
7 Pb
±
01-2
02
15
3 39
55
0.7
0.08
352
14.6
0.
0098
5 2.
0 0.
14
63.2
1.
3 N
A
NA
N
A
NA
165
463
0.9
0.01
352
33.6
0.
0097
5 2.
1 0.
06
62.6
1.
3 N
A
NA
N
A
NA
280
7304
0.
9 0.
0507
2 17
.4
0.00
958
2.0
0.11
61
.4
1.2
NA
N
A
NA
N
A
13
0 54
9 0.
7 0.
0779
1 20
.3
0.00
958
2.1
0.10
61
.5
1.3
NA
N
A
NA
N
A
14
3 66
0 0.
9 0.
0136
3 28
.7
0.00
994
2.1
0.07
63
.7
1.3
NA
N
A
NA
N
A
24
8 63
6 0.
7 0.
0957
7 12
.4
0.00
989
2.1
0.17
63
.5
1.3
NA
N
A
NA
N
A
28
3 83
8 0.
8 0.
0178
2 18
.4
0.00
946
2.0
0.11
60
.7
1.2
NA
N
A
NA
N
A
32
6 99
6 1.
9 0.
0361
9 30
.7
0.00
987
2.0
0.07
63
.3
1.3
NA
N
A
NA
N
A
52
5 62
8 0.
9 0.
0484
4 8.
8 0.
0097
2 2.
1 0.
24
62.4
1.
3 N
A
NA
N
A
NA
195
655
0.7
0.03
209
15.6
0.
0097
3 2.
1 0.
13
62.4
1.
3 N
A
NA
N
A
NA
304
570
0.7
0.01
119
26.0
0.
0100
2 2.
1 0.
08
64.3
1.
3 N
A
NA
N
A
NA
258
707
2.1
0.04
344
11.9
0.
0100
6 2.
1 0.
17
64.5
1.
3 N
A
NA
N
A
NA
313
581
0.7
0.01
149
26.6
0.
0099
8 2.
1 0.
08
64.0
1.
3 N
A
NA
N
A
NA
241
505
0.8
0.01
224
27.2
0.
0100
2 2.
1 0.
08
64.3
1.
4 N
A
NA
N
A
NA
431
751
1.2
0.01
986
13.1
0.
0093
0 2.
1 0.
16
59.7
1.
2 N
A
NA
N
A
NA
243
1271
0.
7 0.
0660
0 6.
3 0.
0101
9 2.
0 0.
32
65.4
1.
3 N
A
NA
N
A
NA
206
282
0.9
0.00
519
79.3
0.
0097
3 2.
4 0.
03
62.4
1.
5 N
A
NA
N
A
NA
240
277
1.3
0.01
543
34.2
0.
0097
8 2.
4 0.
07
62.7
1.
5 N
A
NA
N
A
NA
148
388
1.0
0.00
358
68.1
0.
0097
8 2.
2 0.
03
62.7
1.
4 N
A
NA
N
A
NA
283
930
0.8
0.09
113
43.1
0.
0099
1 2.
0 0.
05
63.6
1.
3 N
A
NA
N
A
NA
350
348
1.6
0.03
032
18.2
0.
0096
6 2.
3 0.
12
62.0
1.
4 N
A
NA
N
A
NA
194
491
0.8
0.02
343
20.6
0.
0099
8 2.
1 0.
10
64.0
1.
4 N
A
NA
N
A
NA
311
885
0.7
0.02
604
10.1
0.
0101
0 2.
0 0.
20
64.8
1.
3 N
A
NA
N
A
NA
341
588
0.7
0.00
912
65.4
0.
0100
2 2.
1 0.
03
64.3
1.
3 N
A
NA
N
A
NA
243
355
1.1
0.00
072
90.1
0.
0100
0 2.
2 0.
02
64.1
1.
4 N
A
NA
N
A
NA
356
568
0.9
0.03
437
11.2
0.
0099
9 2.
1 0.
19
64.1
1.
3 N
A
NA
N
A
NA
300
383
0.7
0.00
611
47.3
0.
0093
8 2.
2 0.
05
60.2
1.
3 N
A
NA
N
A
NA
333
558
0.7
0.01
451
21.4
0.
0096
6 2.
1 0.
10
62.0
1.
3 N
A
NA
N
A
NA
275
393
0.9
0.05
579
11.5
0.
0096
6 2.
2 0.
19
62.0
1.
4 N
A
NA
N
A
NA
281
374
0.6
0.01
674
26.4
0.
0099
6 2.
2 0.
08
63.9
1.
4 N
A
NA
N
A
NA
01
-208
3605
76
99
2.5
0.04
027
2.8
0.00
779
2.0
0.72
50
.0
1.0
NA
N
A
NA
N
A
18
08
2894
1.
5 0.
0469
3 3.
0 0.
0082
4 2.
0 0.
68
52.9
1.
1 N
A
NA
N
A
NA
9427
13
,190
3.
0 0.
0481
0 2.
3 0.
0081
9 2.
0 0.
88
52.6
1.
0 N
A
NA
N
A
NA
5501
10
,000
2.
1 0.
0477
8 2.
5 0.
0081
2 2.
0 0.
79
52.1
1.
0 N
A
NA
N
A
NA
500
6461
1.
0 0.
0473
9 2.
5 0.
0082
3 2.
0 0.
79
52.8
1.
1 N
A
NA
N
A
NA
1166
69
06
2.4
0.04
461
2.8
0.00
832
2.0
0.73
53
.4
1.1
NA
N
A
NA
N
A
14
4 58
2 1.
5 0.
0903
9 7.
8 0.
0080
1 2.
6 0.
33
51.4
1.
3 N
A
NA
N
A
NA
1004
23
41
1.5
0.05
996
3.0
0.00
796
2.0
0.67
51
.1
1.0
NA
N
A
NA
N
A
11
72
757
1.6
0.06
494
12.6
0.
0080
0 2.
7 0.
22
51.3
1.
4 N
A
NA
N
A
NA
1094
85
8 1.
3 0.
0669
5 6.
6 0.
0079
6 2.
2 0.
34
51.1
1.
1 N
A
NA
N
A
NA
2457
21
09
0.5
0.05
387
5.3
0.00
783
2.1
0.40
50
.3
1.1
NA
N
A
NA
N
A
69
9 32
3 1.
5 0.
0913
6 28
.9
0.00
790
5.5
0.19
50
.7
2.8
NA
N
A
NA
N
A
(Con
tinue
d )
U
2009156
DR p. 21
14T
AB
LE 4
B. P
ALE
OG
EN
E B
AT
HO
LIT
H. U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OLO
GIC
AN
ALY
SE
S B
Y L
AS
ER
-AB
LAT
ION
MU
LTIC
OLL
EC
TO
R
ICP
MA
SS
SP
EC
TR
OM
ET
ER
Y (
Con
tinue
d )
)aM( sega tnerapp
A soitar cipotosI
A
naly
sis
U
(ppm
)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*23
8 U
± (%)
Err
or
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*20
7 Pb
±
01-2
08 (
Con
tinue
d )
69
6 29
38
1.4
0.05
835
4.0
0.00
788
2.0
0.51
50
.6
1.0
NA
N
A
NA
N
A
37
3 60
8 1.
4 0.
0215
7 21
.4
0.00
789
2.4
0.11
50
.6
1.2
NA
N
A
NA
N
A
55
2 21
25
1.6
0.05
912
5.8
0.00
834
2.0
0.35
53
.5
1.1
NA
N
A
NA
N
A
69
9 32
3 1.
5 0.
0964
3 21
.3
0.00
841
4.5
0.21
54
.0
2.4
NA
N
A
NA
N
A
69
6 29
38
1.4
0.05
995
4.0
0.00
808
2.0
0.50
51
.9
1.0
NA
N
A
NA
N
A
69
0 26
04
1.0
0.05
276
16.7
0.
0080
1 2.
0 0.
12
51.4
1.
0 N
A
NA
N
A
NA
3163
12
,619
1.
1 0.
0480
2 2.
5 0.
0078
3 2.
0 0.
80
50.3
1.
0 N
A
NA
N
A
NA
4717
22
09
4.9
0.04
740
6.1
0.00
820
2.1
0.35
52
.6
1.1
NA
N
A
NA
N
A
81
89
6 1.
2 0.
0594
1 16
.7
0.00
839
2.1
0.13
53
.9
1.1
NA
N
A
NA
N
A
23
8 78
1 2.
3 0.
0239
4 49
.4
0.00
780
2.2
0.04
50
.1
1.1
NA
N
A
NA
N
A
93
8 11
91
1.4
0.03
318
13.4
0.
0080
3 2.
3 0.
17
51.6
1.
2 N
A
NA
N
A
NA
01
-232
948
2583
1.
6 0.
0671
3 2.
8 0.
0105
7 2.
0 0.
72
67.8
1.
4 N
A
NA
N
A
NA
498
13,4
62
1.4
0.07
458
2.2
0.01
125
2.0
0.89
72
.1
1.4
NA
N
A
NA
N
A
92
9 18
75
1.7
0.05
354
2.9
0.01
079
2.0
0.70
69
.2
1.4
NA
N
A
NA
N
A
18
99
2797
0.
6 0.
0721
4 2.
4 0.
0104
8 2.
0 0.
83
67.2
1.
3 N
A
NA
N
A
NA
862
2288
1.
4 0.
0678
0 2.
5 0.
0105
0 2.
0 0.
79
67.4
1.
3 N
A
NA
N
A
NA
1174
57
99
1.8
0.05
603
2.3
0.01
026
2.0
0.87
65
.8
1.3
NA
N
A
NA
N
A
10
32
12,0
68
1.1
0.05
797
2.3
0.01
053
2.0
0.89
67
.5
1.3
NA
N
A
NA
N
A
24
34
8573
5.
8 0.
0627
4 2.
3 0.
0105
9 2.
0 0.
88
67.9
1.
4 N
A
NA
N
A
NA
715
1315
1.
4 0.
0791
5 3.
0 0.
0116
1 2.
0 0.
67
74.4
1.
5 N
A
NA
N
A
NA
993
1669
0.
9 0.
0745
1 2.
7 0.
0107
2 2.
0 0.
75
68.8
1.
4 N
A
NA
N
A
NA
474
10,7
81
2.1
0.08
326
2.8
0.01
119
2.0
0.72
71
.7
1.4
NA
N
A
NA
N
A
12
70
1649
0.
9 0.
0833
0 2.
6 0.
0110
4 2.
0 0.
76
70.8
1.
4 N
A
NA
N
A
NA
937
502
1.1
0.03
786
9.7
0.01
050
2.1
0.22
67
.3
1.4
NA
N
A
NA
N
A
93
5 10
36
0.9
0.07
225
3.3
0.01
081
2.0
0.61
69
.3
1.4
NA
N
A
NA
N
A
64
6 67
56
1.5
0.07
316
3.5
0.01
101
2.0
0.58
70
.6
1.4
NA
N
A
NA
N
A
53
5 85
04
2.3
0.06
794
3.2
0.01
083
2.0
0.63
69
.4
1.4
NA
N
A
NA
N
A
92
1 16
28
0.9
0.07
893
2.8
0.01
118
2.0
0.71
71
.7
1.4
NA
N
A
NA
N
A
12
65
3358
0.
6 0.
0742
6 2.
6 0.
0111
8 2.
0 0.
78
71.7
1.
4 N
A
NA
N
A
NA
309
27,1
78
1.6
0.05
752
3.9
0.01
072
2.0
0.51
68
.8
1.4
NA
N
A
NA
N
A
64
0 15
20
2.4
0.07
384
3.1
0.01
107
2.0
0.65
71
.0
1.4
NA
N
A
NA
N
A
11
01
53,4
52
0.7
0.06
687
2.2
0.01
090
2.0
0.89
69
.9
1.4
NA
N
A
NA
N
A
58
5 51
67
1.0
0.06
356
2.3
0.01
051
2.0
0.87
67
.4
1.3
NA
N
A
NA
N
A
75
9 11
48
0.9
0.08
046
3.2
0.01
031
2.0
0.62
66
.2
1.3
NA
N
A
NA
N
A
43
7 10
28
1.4
0.09
500
3.3
0.01
109
2.0
0.61
71
.1
1.4
NA
N
A
NA
N
A
53
0 30
04
1.0
0.05
696
3.2
0.01
059
2.0
0.62
67
.9
1.4
NA
N
A
NA
N
A
01-2
35
90
9 57
00
0.9
0.46
520
2.3
0.03
776
2.0
0.87
23
9.0
4.7
387.
9 7.
4 14
12
22
52
5 23
66
1.7
0.04
825
8.3
0.00
907
2.1
0.26
58
.2
1.2
47.8
3.
9 –4
46
212
55
8 48
77
3.5
0.07
406
2.6
0.01
151
2.0
0.78
73
.7
1.5
72.5
1.
8 33
38
1351
41
94
1.2
0.05
087
3.9
0.00
829
2.0
0.53
53
.2
1.1
50.4
1.
9 –8
3 80
626
29,3
96
1.6
0.04
883
4.1
0.00
842
2.0
0.48
54
.0
1.1
48.4
2.
0 –2
23
91
69
6 50
65
0.9
2.09
043
2.3
0.12
603
2.0
0.88
76
5.2
14.5
11
45.7
15
.6
1961
19
(C
ontin
ued
)
2009156
DR p. 22
15
TA
BLE
4B
. PA
LEO
GE
NE
BA
TH
OLI
TH
. U-P
b (Z
IRC
ON
) G
EO
CH
RO
NO
LOG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
IC
P M
AS
S S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
)aM( sega tnerapp
A soitar cipotosI
A
naly
sis
U
(ppm
)
206 P
b
204 P
b U
T
h
207 P
b*23
5 U
± (%)
206 P
b*
238 U
± (%
) E
rror
corr
.
206 P
b*
238 U
±
207 P
b*
235 U
±
206 P
b*
207 P
b ±
01-2
35 (
Con
tinue
d )
537
2751
2.
9 0.
1761
0 3.
5 0.
0147
0 2.
1 0.
59
94.1
2.
0 16
4.7
5.4
1358
55
625
6752
1.
6 3.
8797
3 2.
3 0.
1629
9 2.
0 0.
89
973.
4 18
.1
1609
.5
18.2
25
83
17
14
40
14,1
16
1.7
0.09
905
2.3
0.01
043
2.0
0.88
66
.9
1.3
95.9
2.
1 89
6 23
1422
10
,603
1.
6 0.
0539
2 2.
4 0.
0083
8 2.
0 0.
84
53.8
1.
1 53
.3
1.2
33
31
34
78
7409
6.
2 0.
0509
9 2.
4 0.
0084
5 2.
0 0.
82
54.3
1.
1 50
.5
1.2
–125
35
2837
69
16
3.2
0.05
174
2.9
0.00
823
2.0
0.68
52
.9
1.1
51.2
1.
5 –2
5 52
871
2935
3.
2 0.
0420
0 27
.0
0.00
818
2.0
0.07
52
.5
1.1
41.8
11
.0
–540
73
3
547
1675
1.
6 0.
0524
9 10
.0
0.00
844
2.2
0.21
54
.1
1.2
51.9
5.
1 –4
9 23
9
1639
63
46
2.8
0.50
116
2.5
0.03
422
2.0
0.82
21
6.9
4.3
412.
5 8.
3 17
35
26
15
14
2297
3.
3 0.
0557
5 4.
6 0.
0089
5 2.
1 0.
45
57.4
1.
2 55
.1
2.4
–45
99
23
53
28,1
77
6.9
0.19
285
2.2
0.01
670
2.0
0.89
10
6.8
2.1
179.
1 3.
7 12
87
20
57
9 32
27
2.4
0.14
137
3.1
0.01
238
2.0
0.67
79
.3
1.6
134.
3 3.
8 12
64
44
69
1 24
42
2.0
0.04
507
5.6
0.00
910
2.0
0.36
58
.4
1.2
44.8
2.
5 –6
36
144
51
7 62
66
2.1
0.05
314
3.8
0.00
829
2.0
0.52
53
.2
1.1
52.6
2.
0 23
79
1093
14
99
1.1
0.04
557
11.1
0.
0082
6 2.
3 0.
21
53.0
1.
2 45
.2
4.9
–351
28
1
3533
25
35
6.0
0.05
332
5.3
0.00
802
2.1
0.39
51
.5
1.1
52.7
2.
7 11
1 11
5
2150
10
,961
1.
5 0.
0506
6 2.
3 0.
0082
3 2.
0 0.
86
52.9
1.
1 50
.2
1.1
–77
29
64
0 42
8 2.
5 0.
0166
7 35
.0
0.00
833
2.7
0.08
53
.4
1.4
16.8
5.
8 –4
373
1093
1042
17
4 2.
1 0.
0473
4 46
.9
0.00
840
8.8
0.19
54
.0
4.7
47.0
21
.5
–297
12
34
66
0 12
72
1.2
0.03
912
11.1
0.
0080
8 2.
2 0.
20
51.8
1.
1 39
.0
4.3
–698
30
4
1555
14
71
1.8
0.05
508
7.5
0.00
805
2.2
0.29
51
.7
1.1
54.4
4.
0 17
6 16
7 01
-268
46
238
1.2
0.17
356
14.8
0.
0115
4 3.
3 0.
23
74.0
2.
4 N
A
NA
N
A
NA
137
634
1.5
0.02
447
42.1
0.
0100
8 3.
5 0.
08
64.7
2.
2 N
A
NA
N
A
NA
94
318
0.9
0.06
091
24.2
0.
0098
3 2.
7 0.
11
63.1
1.
7 N
A
NA
N
A
NA
263
613
1.1
0.01
661
46.8
0.
0100
2 3.
1 0.
07
64.3
2.
0 N
A
NA
N
A
NA
76
4507
0.
9 0.
0573
5 34
.8
0.00
988
2.0
0.06
63
.4
1.3
NA
N
A
NA
N
A
78
15
5 1.
0 –0
.068
6771
7.9
0.00
869
11.0
0.
02
55.8
6.
1 N
A
NA
N
A
NA
118
252
1.4
–0.0
3935
14
75.2
0.
0090
8 7.
6 0.
01
58.3
4.
4 N
A
NA
N
A
NA
164
582
1.4
0.02
497
26.1
0.
0095
4 2.
5 0.
10
61.2
1.
5 N
A
NA
N
A
NA
61
1933
1.
0 0.
0655
8 6.
9 0.
0099
5 2.
1 0.
30
63.8
1.
3 N
A
NA
N
A
NA
62
1167
1.
6 0.
0655
1 11
.9
0.00
980
2.1
0.18
62
.9
1.3
NA
N
A
NA
N
A
11
0 52
2 1.
6 0.
0421
5 30
.0
0.01
012
3.5
0.12
64
.9
2.3
NA
N
A
NA
N
A
99
68
74
1.1
0.05
407
26.4
0.
0098
2 2.
0 0.
08
63.0
1.
3 N
A
NA
N
A
NA
91
6405
0.
9 0.
0850
6 3.
8 0.
0104
8 2.
0 0.
53
67.2
1.
3 N
A
NA
N
A
NA
86
600
1.1
0.01
311
53.0
0.
0100
4 3.
0 0.
06
64.4
2.
0 N
A
NA
N
A
NA
40
317
1.2
–0.0
0725
15
3.6
0.00
995
3.9
0.03
63
.8
2.5
NA
N
A
NA
N
A
75
80
0 0.
9 0.
0325
1 29
.4
0.00
974
2.2
0.08
62
.5
1.4
NA
N
A
NA
N
A
64
90
0 1.
2 0.
0871
6 26
.0
0.00
965
2.5
0.09
61
.9
1.5
NA
N
A
NA
N
A
99
90
0 0.
8 0.
0278
7 32
.2
0.00
977
2.1
0.07
62
.6
1.3
NA
N
A
NA
N
A
13
4 15
74
1.2
0.05
387
9.9
0.00
982
2.2
0.22
63
.0
1.4
NA
N
A
NA
N
A
(Con
tinue
d )
2009156
DR p. 23
16T
AB
LE 4
B. P
ALE
OG
EN
E B
AT
HO
LIT
H. U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OLO
GIC
AN
ALY
SE
S B
Y L
AS
ER
-AB
LAT
ION
MU
LTIC
OLL
EC
TO
R
ICP
MA
SS
SP
EC
TR
OM
ET
ER
Y (
Con
tinue
d )
)aM( sega tnerapp
A soitar cipotosI
Ana
lysi
s U
(p
pm)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) E
rror
co
rr.
206 P
b*
238 U
±
207 P
b*23
5 U
±20
6 Pb*
207 P
b ±
02-1
6
1c
29
2036
8.
9 0.
0728
9 39
.4
0.01
244
2.5
0.06
79
.7
4.0
71.4
28
.7
–197
.6
492.
1 2c
20
30
59
1.0
0.10
121
171.
7 0.
0126
2 3.
6 0.
02
80.8
5.
9 97
.9
162.
6 53
6.1
1878
.0
3c
22
1336
3.
6 0.
1007
0 35
.5
0.01
251
3.6
0.10
80
.1
5.8
97.4
35
.7
544.
5 38
5.9
4c
40
1217
44
.8
0.08
504
106.
4 0.
0131
8 1.
6 0.
01
84.4
2.
7 82
.9
87.9
38
.6
1272
.8
5c
41
931
13.6
0.
0578
4 23
.1
0.01
227
1.7
0.07
78
.6
2.7
57.1
13
.4
–774
.0
324.
3 6c
45
21
25
10.6
0.
0754
4 18
.6
0.01
325
1.0
0.05
84
.8
1.7
73.8
14
.2
–269
.1
236.
3 7c
15
11
10
8.1
0.18
288
112.
8 0.
0126
2 4.
0 0.
04
80.9
6.
5 17
0.5
190.
5 17
15.8
10
36.6
8c
20
10
47
6.1
0.11
047
227.
1 0.
0123
6 3.
1 0.
01
79.2
4.
9 10
6.4
227.
3 76
8.5
2391
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9c
57
1877
11
.3
0.06
606
27.8
0.
0123
4 1.
7 0.
06
79.1
2.
8 65
.0
18.5
–4
28.2
36
3.7
10c
30
2253
8.
7 0.
0719
0 75
.9
0.01
260
1.5
0.02
80
.7
2.4
70.5
53
.9
–263
.8
962.
6 11
c 94
31
01
11.9
0.
0825
1 17
.1
0.01
285
1.0
0.06
82
.3
1.7
80.5
14
.3
27.6
20
5.1
12c
52
883
31.4
0.
0842
3 11
.9
0.01
275
1.3
0.11
81
.7
2.2
82.1
10
.1
95.2
13
9.9
13c
13
632
5.0
0.09
419
267.
1 0.
0127
1 2.
8 0.
01
81.4
4.
6 91
.4
227.
9 35
9.7
3013
.6
14c
59
1362
6.
0 0.
0677
9 22
.7
0.01
261
1.2
0.05
80
.8
2.0
66.6
15
.5
–416
.8
296.
3 15
c 47
39
63
11.0
0.
1425
6 12
.8
0.01
266
1.7
0.13
81
.1
2.7
135.
3 18
.3
1238
.2
124.
2 16
c 43
21
09
11.6
0.
0773
8 30
.7
0.01
313
1.7
0.05
84
.1
2.8
75.7
23
.8
–182
.0
382.
8 17
t 48
15
79
5.5
0.07
184
20.4
0.
0129
7 1.
0 0.
05
83.1
1.
6 70
.4
14.8
–3
40.7
26
2.7
18t
49
4862
6.
9 0.
0812
7 14
.2
0.01
307
1.0
0.07
83
.7
1.6
79.3
11
.7
–50.
0 17
2.9
19t
70
2584
10
.2
0.07
631
25.5
0.
0130
6 1.
0 0.
04
83.6
1.
8 74
.7
19.5
–2
03.3
31
8.8
20t
32
3394
8.
7 0.
1160
2 85
.7
0.01
351
1.8
0.02
86
.5
3.2
111.
5 96
.3
683.
2 91
5.3
21t
45
1779
6.
6 0.
0704
1 29
.4
0.01
231
1.1
0.04
78
.9
1.7
69.1
20
.8
–258
.4
372.
3 22
t 62
20
66
7.0
0.09
207
16.5
0.
0136
4 1.
3 0.
08
87.3
2.
3 89
.4
15.3
14
6.5
192.
9 23
t 12
0 87
73
11.5
0.
0814
9 16
.3
0.01
271
1.1
0.07
81
.4
1.8
79.5
13
.4
24.3
19
4.8
24t
54
4302
9.
2 0.
0763
4 10
.6
0.01
205
1.3
0.12
77
.2
2.0
74.7
8.
2 –5
.0
127.
5 02
-25
1t
29
67
8 4.
9 0.
0454
7 32
.6
0.01
042
1.7
0.05
66
.8
2.3
45.1
15
.0
–997
.5
482.
9 2t
29
99
8 6.
6 0.
0530
5 81
.5
0.00
978
1.7
0.02
62
.8
2.1
52.5
43
.0
–394
.5
1060
.9
3t
36
1704
9.
2 0.
1013
8 48
.8
0.01
002
1.8
0.04
64
.3
2.3
98.1
49
.1
1024
.7
493.
8 4t
44
14
06
4.4
0.09
379
30.3
0.
0098
6 1.
6 0.
05
63.2
2.
1 91
.0
28.4
89
8.9
311.
7 5t
28
98
8 7.
9 0.
1825
3 24
9.0
0.00
993
3.4
0.01
63
.7
4.3
170.
2 38
0.4
2142
.3
2175
.7
6t
34
4513
5.
7 0.
0393
8 35
.2
0.01
049
2.1
0.06
67
.2
2.8
39.2
14
.0
–146
6.7
578.
9 7t
26
59
92
12.0
0.
0727
6 63
.2
0.01
005
0.9
0.01
64
.4
1.2
71.3
45
.6
308.
6 71
9.2
8t
22
814
8.0
0.05
049
27.2
0.
0099
9 4.
5 0.
17
64.1
5.
8 50
.0
13.8
–5
82.5
36
3.1
9t
32
1796
5.
0 0.
0789
3 52
.5
0.00
979
3.0
0.06
62
.8
3.8
77.1
41
.2
547.
4 57
2.5
10t
26
27,1
70
11.7
0.
0952
7 71
.8
0.00
944
2.3
0.03
60
.6
2.8
92.4
67
.2
1018
.5
726.
8 11
t 44
10
63
9.2
0.04
632
46.1
0.
0097
9 1.
8 0.
04
62.8
2.
2 46
.0
21.4
–7
64.8
64
7.9
12t
31
8502
7.
1 0.
0975
1 11
5.1
0.01
003
2.3
0.02
64
.4
3.0
94.5
10
8.0
942.
7 11
79.3
13
t 34
11
89
14.7
0.
3641
6 26
0.2
0.00
933
2.8
0.01
59
.9
3.3
315.
3 67
6.9
3379
.4
2029
.1
14t
44
583
14.4
0.
0829
0 84
.8
0.00
983
1.7
0.02
63
.0
2.1
80.9
69
.0
645.
6 91
1.0
15t
37
1266
9.
9 0.
0474
0 45
.9
0.01
032
2.2
0.05
66
.2
3.0
47.0
21
.8
–848
.8
657.
0 16
t 32
93
7 9.
9 0.
0552
5 49
.1
0.00
971
2.4
0.05
62
.3
3.0
54.6
27
.2
–269
.9
622.
9 17
t 16
43
7 8.
6 0.
0270
6 40
.4
0.00
959
5.0
0.12
61
.6
6.2
27.1
11
.0
–253
8.4
858.
9 18
t 19
54
9 9.
4 0.
0304
1 95
.1
0.01
073
3.4
0.04
68
.8
4.6
30.4
29
.0
–251
4.8
2024
.2
19t
22
482
6.9
0.11
815
138.
0 0.
0097
1 3.
2 0.
02
62.3
4.
0 11
3.4
153.
3 13
88.5
13
23.7
20
t 48
15
09
8.8
0.07
878
30.4
0.
0104
0 0.
9 0.
03
66.7
1.
2 77
.0
24.0
40
9.6
340.
1 (C
ontin
ued
)
2009156
DR p. 24
17
TA
BLE
4B
. PA
LEO
GE
NE
BA
TH
OLI
TH
. U-P
b (Z
IRC
ON
) G
EO
CH
RO
NO
LOG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
IC
P M
AS
S S
PE
CT
RO
ME
TE
RY
(C
ontin
ued
)
)aM( sega tnerapp
A soitar cipotosI
Ana
lysi
s U
(p
pm)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) E
rror
co
rr.
206 P
b*
238 U
±
207 P
b*23
5 U
±20
6 Pb*
207 P
b ±
02-3
1
1c
99
10,2
94
5.9
0.26
476
3.4
0.03
660
1.7
0.49
23
1.7
7.8
238.
5 9.
1 30
5.8
33.9
2c
14
0 30
1 25
.4
0.46
408
7.0
0.04
768
1.3
0.18
30
0.3
7.9
387.
1 32
.3
945.
7 70
.1
3c
77
4758
10
4.3
0.24
194
6.6
0.03
127
1.3
0.19
19
8.5
5.0
220.
0 16
.1
456.
6 72
.2
4c
53
2696
9.
8 0.
0975
2 10
3.8
0.00
771
2.1
0.02
49
.5
2.0
94.5
97
.9
1462
.4
986.
3 5t
14
0 42
58
2.0
0.05
099
7.2
0.00
787
0.9
0.13
50
.5
0.9
50.5
3.
7 48
.3
85.4
6c
8
1110
12
8.7
0.24
398
11.9
0.
0320
7 3.
8 0.
32
203.
5 15
.8
221.
7 29
.0
419.
5 12
5.7
7t
29
23,6
01
5.0
0.37
084
9.8
0.05
060
3.5
0.35
31
8.2
22.5
32
0.3
36.4
33
5.5
104.
3 8c
17
9 64
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2.
5 0.
3947
5 3.
5 0.
0545
7 2.
8 0.
79
342.
5 19
.4
337.
8 14
.0
305.
9 24
.7
9t
89
611,
352
4.6
0.31
782
4.2
0.04
818
1.9
0.44
30
3.3
11.5
28
0.2
13.5
91
.4
44.7
10
c 11
9 21
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4.
9 0.
2938
1 2.
3 0.
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2 1.
3 0.
54
272.
8 7.
0 26
1.6
6.9
162.
2 22
.8
11c
98
2035
7.
4 0.
3711
7 3.
8 0.
0537
4 1.
8 0.
47
337.
5 12
.4
320.
5 14
.4
199.
2 39
.5
12c
186
23,5
54
2.2
0.28
090
1.8
0.04
078
0.9
0.53
25
7.7
4.9
251.
4 5.
0 19
2.9
17.2
13
t 20
0 11
,538
2.
4 0.
0485
6 8.
4 0.
0080
9 2.
8 0.
34
52.0
3.
0 48
.1
4.1
–138
.3
97.4
14
c 56
29
52
2.3
0.23
996
5.3
0.03
914
2.8
0.52
24
7.5
13.9
21
8.4
12.7
–8
5.0
54.9
15
c 10
4 66
3 7.
9 0.
2633
1 11
.1
0.03
784
1.3
0.11
23
9.4
6.1
237.
3 29
.2
216.
8 12
7.2
16c
154
13,5
43
11.1
0.
2956
4 2.
3 0.
0419
9 1.
2 0.
52
265.
1 6.
3 26
3.0
6.8
243.
8 22
.3
17c
50
8380
1.
9 0.
4111
0 5.
4 0.
0576
7 0.
8 0.
15
361.
4 6.
0 34
9.7
22.4
27
2.4
61.5
18
t 16
0 37
94
4.1
0.04
136
16.8
0.
0076
5 3.
0 0.
18
49.1
3.
0 41
.1
7.0
–402
.6
215.
7 19
t 16
1 73
21
3.7
0.04
668
16.1
0.
0080
2 3.
1 0.
19
51.5
3.
2 46
.3
7.6
–215
.5
198.
8 20
c 25
74
1 4.
6 0.
0277
0 31
.7
0.00
844
5.7
0.18
54
.2
6.1
27.7
8.
9 –1
937.
9 57
5.3
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15
982
5.1
0.07
019
72.3
0.
0080
1 3.
4 0.
05
51.4
3.
5 68
.9
50.2
72
6.5
765.
2 22
c 11
9 34
67
6.8
0.38
962
3.1
0.05
292
2.6
0.84
33
2.4
17.5
33
4.1
12.0
34
5.8
18.9
23
c 11
23
10
3.6
0.43
497
30.0
0.
0597
6 1.
3 0.
04
374.
2 9.
8 36
6.7
124.
6 31
9.8
340.
8 24
c 14
10
,931
3.
9 0.
3931
3 10
.0
0.05
766
1.2
0.12
36
1.4
9.2
336.
7 39
.2
169.
2 11
5.9
25c
147
3196
2.
8 0.
0677
4 11
.7
0.00
802
2.1
0.17
51
.5
2.1
66.6
8.
0 64
7.2
124.
0 26
c 82
79
03
4.2
0.04
000
15.1
0.
0076
5 1.
5 0.
10
49.1
1.
5 39
.8
6.1
–489
.2
199.
7 27
c 27
9 1 1
60
NA
0.
0523
6 8.
8 0.
0077
6 6.
7 0.
76
49.8
6.
7 51
.8
4.6
145.
1 67
.0
28c
218
1321
2.
3 0.
0460
9 6.
8 0.
0078
4 1.
0 0.
15
50.3
1.
0 45
.8
3.2
–188
.8
83.8
29
c 14
7 14
68
4.6
0.05
939
16.6
0.
0080
7 1.
1 0.
07
51.8
1.
1 58
.6
10.0
34
4.0
187.
3
Not
es:
Ana
lyse
s in
ital
ics
are
from
rim
s or
tips
vis
ible
in C
L im
ages
. S
ee te
xt fo
r fu
rthe
r ex
plan
atio
n.
S
ee T
able
2B
for
expl
anat
ion
of o
ther
dat
a.
IC
P =
indu
ctiv
ely
coup
led
plas
ma;
NA
= d
ata
not a
vaila
ble.
2009156
DR p. 25
18
TA
BLE
5A
. MIO
CE
NE
BO
DIE
S: U
-Pb
(ZIR
CO
N)
GE
OC
HR
ON
OLO
GIC
AN
ALY
SE
S B
Y T
HE
RM
AL
ION
IZA
TIO
N M
AS
S
SP
EC
TR
OM
ET
RY
)a
M( sega tnerappA
Sam
ple
Wt.
(µg)
U
(p
pm)
206 P
b m
204 P
b
206 P
b 20
8 Pb
206 P
b*
238 U
±
207 P
b*
235 U
±
207 P
b*
206 P
b*
±
TO
MB
ST
ON
E
ZD
11
0 94
2 12
10
5.2
22.5
0.
4 22
.5
0.4
19
24
ZB
13
0 83
4 34
5 3.
6 22
.2
0.2
22.4
0.
4 42
64
Z
B
125
1005
54
0 4.
6 22
.3
0.3
22.4
0.
5 30
41
Z
A
155
585
540
4.9
22.1
0.
2 22
.3
0.5
37
40
N
ote:
See
Tab
le 2
A fo
r ex
plan
atio
n of
dat
a.
T
AB
LE 5
B. M
IOC
EN
E B
OD
IES
: U-P
b (Z
IRC
ON
) G
EO
CH
RO
NO
LOG
IC A
NA
LYS
ES
BY
LA
SE
R-A
BLA
TIO
N M
ULT
ICO
LLE
CT
OR
ICP
MA
SS
SP
EC
TR
OM
ET
ER
Y
)aM( sega tnerapp
A
soitar cipotosI A
naly
sis
U
(ppm
)
206 P
b
204 P
b U
T
h
207 P
b*
235 U
± (%
)
206 P
b*
238 U
± (%
) er
ror
corr
.
20
6 Pb*
23
8 U
±20
7 Pb*
23
5 U
±20
6 Pb*
20
7 Pb*
±
02-K
TN
-1
106
3309
9.
1 0.
0305
6 31
.1
0.00
427
2.3
0.07
27.5
2.
5 30
.6
9.6
283.
1 35
4.6
-2
119
4073
9.
0 0.
0256
3 23
.2
0.00
416
2.0
0.09
26.8
2.
2 25
.7
6.0
–73.
2 28
3.1
-3
172
7271
5.
6 0.
0264
9 11
.8
0.00
414
1.2
0.10
26.6
1.
2 26
.5
3.2
19.4
14
0.8
-4
101
3618
6.
9 0.
0266
3 36
.1
0.00
414
2.1
0.06
26.6
2.
2 26
.7
9.7
32.4
43
1.1
-5
54
2992
5.
1 0.
0283
8 52
.9
0.00
414
3.0
0.06
26.6
3.
2 28
.4
15.1
18
1.5
614.
8 -6
14
1 27
96
11.5
0.
0251
3 20
.1
0.00
420
1.4
0.07
27.0
1.
5 25
.2
5.1
–146
.9
248.
6 -7
10
2 87
2 10
.5
0.02
430
16.9
0.
0044
0 2.
0 0.
12
28
.3
2.3
24.4
4.
2 –3
49.1
21
6.8
-8
96
1265
9.
6 0.
0219
6 21
.2
0.00
424
1.8
0.08
27.3
1.
9 22
.1
4.7
–518
.1
282.
1 -9
81
20
39
5.0
0.04
297
69.7
0.
0039
7 2.
6 0.
04
25
.5
2.7
42.7
30
.0
1160
.9
690.
9 -1
0 15
5 34
15
8.4
0.03
048
8.9
0.00
412
0.8
0.09
26.5
0.
9 30
.5
2.7
359.
1 99
.7
-11
241
23,1
58
10.1
0.
0304
8 14
.3
0.00
395
1.0
0.07
25.4
1.
1 30
.5
4.4
450.
5 15
8.5
-12
144
8354
12
.8
0.02
191
45.8
0.
0040
6 1.
4 0.
03
26
.1
1.4
22.0
10
.1
–410
.2
598.
1 -1
3 57
43
8 38
.4
0.04
042
13.1
0.
0044
3 2.
6 0.
20
28
.5
2.9
40.2
5.
4 81
3.1
134.
7 -1
4 16
3 71
7 16
.5
0.04
502
8.1
0.00
419
2.0
0.25
27.0
2.
2 44
.7
3.7
1144
.9
77.9
-1
5 16
3 55
26
9.1
0.02
437
15.4
0.
0042
4 1.
3 0.
08
27
.3
1.4
24.5
3.
8 –2
46.6
19
4.3
-16
62
1554
7.
6 0.
0245
1 64
.3
0.00
401
2.2
0.03
25.8
2.
3 24
.6
15.9
–9
0.0
787.
6 -1
7 72
14
74
5.9
0.02
056
107.
5 0.
0043
3 2.
5 0.
02
27
.8
2.7
20.7
22
.2
–753
.2
1509
.5
-18
178
1633
9.
1 0.
0234
4 25
.6
0.00
420
1.3
0.05
27.0
1.
4 23
.5
6.1
–322
.4
328.
3 -1
9 42
10
05
18.0
0.
0867
8 15
2.6
0.00
379
4.2
0.03
24.4
4.
1 84
.5
126.
3 25
18.3
12
81.6
-2
0 17
0 24
51
8.5
0.06
048
223.
8 0.
0040
2 0.
9 0.
00
25
.9
1.0
59.6
12
8.9
1782
.8
2039
.9
N
otes
: S
ee T
able
2B
for
expl
anat
ion
of d
ata.
ICP
—in
duct
ivel
y co
uple
d pl
asm
a.
2009156
DR p. 26
APPENDIX. METHODS
TIMS Analyses
U-Pb samples were processed using a jaw crusher, roller crusher, Wilfley table, heavy liquids, and Frantz magnetic sepa-rator. The non-magnetic zircons were sieved into size fractions and then selected for analysis based on optical properties using a binocular microscope. An effort was made to select grain with few fractures, inclusions, and cores, and highly elongate rods were possible. The zircons were dissolved in HF>HNO
3 in 0.01
ml Teflon microcapsules within a 125 ml dissolution chamber during a period of 30 h at 245 °C. The solutions were evapo-rated to dryness, 205Pb/235–233U spike was added, and the precipi-tate was dissolved in the dissolution chamber in 3.1 N HCl for 8 h at 225 °C.
Isotope analyses were conducted with a VG-354 mass spec-trometer equipped with six Faraday collectors and an axial Daly detector. The measurements were made in computer-controlled dynamic mode, with the Daly detector used simultaneously with the Faraday collectors to measure 204Pb. The gain factor of the Daly detector was determined continuously by comparing 206Pb
(Faraday) / 205Pb
(Faraday) with 206Pb
(Faraday) / 205Pb
(Daly) and 206Pb
(Faraday) /
207Pb(Faraday)
with 206Pb(Faraday)
/ 207Pb(Daly)
. Analytical methods are reported by Gehrels et al. (1991), and isotopic data were pro-cessed utilizing data reduction and plotting programs of Ludwig (1991a, 1991b).
All uncertainties are at the 95% confidence level.* = radiogenic PbZ—zircon, S—SphenePb
c—total common Pb in picograms
206Pbm/204Pb is measured ratio, uncorrected for spike, frac-
tionation, or common Pb.206Pb/208Pb is corrected for blank, spike, fractionation, and
initial Pb.Pb and U concentrations have uncertainties of up to 25% due
to uncertainty in grain weight. Constants used: λ
235 = 9.8485×10–10, λ
238 = 1.55125×10–10,
238U/235U = 137.88.In calculating U concentration and apparent ages, the iso-
tope ratios are adjusted as follows:(1) Mass dependent corrections factors of: 0.14 ± 0.06%/
AMU for Pb and 0.04 ± 0.04%/AMU for UO2.
(2) Pb ratios corrected for 0.010 ± 0.005 ng blank with 206Pb/204Pb = 18.6 ± 0.3, 207Pb/204Pb = 15.5 ± 0.3, and 208Pb/204Pb = 38.0 ± 0.8.
(3) U has been adjusted for 0.001 ± 0.001 ng blank.(4) Initial Pb composition is from Stacey and Kramers
(1975), with uncertainties of 2.0 for 206Pb/204Pb, 0.3 for 207Pb/204Pb, and 2.0 for 208Pb/204Pb.
All analyses conducted using conventional isotope dilution and thermal ionization mass spectrometry, as described by Geh-rels et al. (1991).
Isotopic data were processed with programs of Ludwig (1991a, 1991b).
ICP Analyses
206Pb/204Pb is measured ratio.All uncertainties are at the 1-sigma level, and include only
measurement errors.U concentration and U/Th have uncertainties of ~25%.Decay constants: 235U = 9.8485×10–10, 238U = 1.55125×10−10,
238U/235U = 137.88.Isotope ratios are corrected for Pb/U fractionation by com-
parison with standard zircon with an age of 564 ± 4 Ma. Initial Pb composition interpreted from Stacey and Kram-
ers (1975), with uncertainties of 1.0 for 206Pb/204Pb and 0.3 for 207Pb/204Pb.
REFERENCES CITED
Aleinikoff, J.N., Schenck, W.S., Plank, M.O., Srogi, L., Fanning, C.M., Kamo, S.L., and Bosbyshell, H., 2006, Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Mor-phology, cathodoluminescence and backscattered electron zoning, and SHRIMP U-Pb geochronology of zircon and monazite: Geological Soci-ety of America Bulletin, v. 118, p. 39–64.
Gehrels, G.E., 2000, Introduction to detrital zircon studies of Paleozoic and Triassic strata in western Nevada and northern California, in Soreghan, M.J., and Gehrels, G.E., eds., Paleozoic and Triassic paleogeography and tectonics of western Nevada and northern California: Geological Society of America Special Paper 347, p. 1–18.
Gehrels, G.E., McClelland, W.C., Samson, S.D., and Patchett, P.J., 1991, U-Pb geochronology of detrital zircons from a continental margin assemblage in the northern Coast Mountains, southeastern Alaska: Canadian Journal of Earth Sciences, v. 28, p. 1285–1300.
Ludwig, K.R., 1991a, A computer program for processing Pb-U-Th isotopic data: U.S. Geological Survey Open-File Report 88-542, 37 p.
Ludwig, K.R., 1991b, A plotting and regression program for radiogenic- isotopic data: U.S. Geological Survey Open-File Report 91-445, 39 p.
Stacey, J.S., and Kramers, J.D., 1975, Approximation of terrestrial lead iso-tope evolution by a two-stage model: Earth and Planetary Science Letters, v. 26, p. 207–221, doi: 10.1016/0012-821X(75)90088-6.
Geological Society of America Special Paper 456
Crustal Cross Sections from the Western North American Cordillera and Elsewhere: Implications for Tectonic and Petrologic Processes
Edited by Robert B. Miller and Arthur W. Snoke
© 2009 The Geological Society of America
To accompany Chapter 4, “Mid-Cretaceous–Recent crustal evolution in the central Coast orogen, British Columbia and southeastern Alaska,” by Maria Luisa Crawford,
Keith A. Klepeis, George E. Gehrels, and Jennifer Lindline
2009156
DR p. 27
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