Embed Size (px)
Citation preview
UNITED STATES DEPARTMEN!C OF TEE IN!CERIOR
. GEOLOGICAL SURVEP
R E C O ~ S S A N C E GEOLOGIC MAP AND GEOCHEMICAL ANALYSES
OF STREAM SEDIMENT AND ROCK SAMPLES OF THE
ANCHORAGE B-7 QUADRANGLE, ALASKA
BY
Sandra H. B. Clark and Susan R. Bartsch
Open-file report
This report is preliminary and has not been edited or rmAewed for conformity with Geological Survey standards and nomenclature
Reco~a~.ssance gemdcgic map and geochemical analyses . of stream sediment and rock samples of the
Anchorage B-7 quadrangle, Alaska
by Sandra A. B. Clark and Susan R. Bartsch
I Introduction I
A reconnaissance geologic map and analytical data for 56 stream-
sediment samples and a4 rock samples from the ~nchdra~e B-7, 1:63,360-scale I
quadrangle are presented in this report, together with a statistical
treatoleat af the geochemical data. The bedrock was mapped and the samples
were collected in 1969 aad 1970 as part of a continuing U.S. Gcological
Survey project to map basement rocks in the western Chugach Mountains.
Most of the eaxly work on the bedrock geology of the Anchorage '8-7
quadrangle and the surro~ding areas was by S. R. Capps (1916 and 1940),
More recently, chrkte-bearing ultramafic rocks in the northeast part' of the
quadrangle and the adjacent part of the Anchorage B-6 quadrangle were mapped
and described by A, W, Rose (1966). Other studies of the chromite-bearing
ultramafic rocks and studies of the adjacent areas that wexe made as the
result of construction of a tunnel and dam as part of a hydroelectric power
development program by the City of Anchorage are summarized by Rose (1966).
The geology and geochemistry of the adjoining Anchorage B-6 quadrangle was
described by Clark and Bartsch (19,71), Ernest Dobrovolny and H:R. Schmoll
of the U.S. Geological Survey are currently mapping the surficial deposits
of the Anchorage Borough, including those in the Anchorage B-7 quadrangle.
In this report no attempt was made to differentiate units within the
surficial deposits. The contacts between bedrock and surficial deposits in
figure 1 and some of the information used i n compiling the bedrock geologic
I map (fig;. 1) are from unpublished map8 by H. R. Schnoll and E. Dobrovolny.
.Allen L. Clark and Ivan Barnes of the U.S. Geological Survey each spent 4
approximately a week helping with geologic mapping and sampling in the
Anchorage B-6 and B-7 quadrangles. David L. Jones and Arthur Grantz of
the U.S. Geological Survey generously shared information and ideas on
geologic interpretation of the units.
Map -its
The age assi&arnents of units in figure 1 aie based on sparse
paleontoPogica1 data and two R-Ar age determinations. The information is
partly from the Anchorage B-7 quadrangle and partly from adjacent areas.
The undifferentiated unit (JPu) includes a variety of plutonic, metaplutonic,
metasedimentary and metavolcanic rocks that crop out near the northwestern
front of the Chugach Mountains. The plutonic and metaplutonic rocks have
compositions ranging from gabbro to quartz diorite. Gxaeissesl and schists I .
have well-developed echistosity and greenschist facies metamorphic
assemblages, sometimes overprinted by prehnf te-pumpellyite f acies minerals.
Ifetasedimentary rocks are generally fine grained and include ineragraywastes ,
sfficeous argillftes, cherts, and marbles. Some metabasalts also oecux in
the unit, The rocks included in the undifferentiated unit differ from the
heterogeneous assemblage (JKa) primarily in the presence of plutonic and
metaplutonic rocks and of gneisses and schists with well-developed
schistosity,and greenschist facies mineral assemblages. The relations of the
different types of rocks in the undifferentiated unit to each other are
obscure because of the lack of continuity of bedrock and the probability
of complex faulting in the area near the range front,
* .. . Ages have been,determined at two localities in the unit of
undifferentiated rocks: krsulinids found in'marble a few hundred feet
from the west contact of 'the ultramafie rocks (fossil locality 1, fig. 1)
were described by Raymond C. Douglaas of the U.S. Geological Survey as
follows (writ ten commuaication, 1971) :
"This sample contains fractured, def omed, and partly secrys tallized specimens of at least twa kinds of fw ulinfds. One is a form of schwagerinid that m y represent Schwagerina sp., Chusenella sp., or Parafusuliaa sp. The possibility that all three are represented cannot
- A be ruled out thus far. The second form is Cancellina sp., a neocchwagerinid,"
"Cancellina is a genus recognized in several places within the Permian Tethyan seaway. This is the first known occurrence of a neoschwagerinid in Alaska, and this is only the third place in the western hemisphere where Cancellina has been recognized."
"Cancellina is considered to be of late Leonardian age but may extend into earliest Guaddupien. At the moment, I would favor a Leonardian age for the Alaskan sample. I' I
"Tomowo Ozawa has recently (1910) summarized the group to which Cancellina is assigned and he concLuded .that Cancellins developed in relatively calm .. waters characteris~tically in the micritic facies. Recrystallization in. this sample has destroyed m ~ s t of the lithologic evidence, but remnants of echinodermal material can be recognized in what may have been a micritic groundmass.
Slightly chloritized biotite from quartz diorite (K-Ar locality 1,
fig. 1) collected by Manrin Laaphere and Arthur Grantz pf the U.S. Geological
Survey was dared with K-Ar metRod by Lanphere at' 161 + 5 m.y. (oral
communication, 197f),
Because a wide variety of rock types are included in the undifferentiited
I unit, it is possible that rocks of ages other than Permian to Jurassic are
included also.
The heterogeneous assemblage (JKa) crops out in the Anchorage B-7
quadrangle mostly in a fault-bounded northeast-trending belt in the central
pare of the quadrangle. The unit is composed predominantly of massive
metaclastic rocks that include weakly metamorphosed graywacke, arkose, and
conglomerate sandstone. The unit also includes greenstones of basaltic I
composition (including pillow lavas) that are usually associated with
radiolaxian chert, cherty argillite, and argillite. Small amounts of
drramafic rocks and marble occur in this unit in the adjacent Anchorage
A-7 quadrangle. The radiolerian chert-pillow basalt associati on is interpreted, 1
to indicate a marine environment: of deposition. The deformation of the . i heterogeneous assemblage is characterized by pervasive closely spaced
shears. The attitudes of locally prombent sets of shears in thia unit
are shown by a cleavage symbol in figure 1. Tight folds are present rarely.
The shearing and-lenticular remuante of beds commonly seen in the
cherty argillite' sequences, as well as lack of persistence of distinctive I lithologic sequences from one ridge to the next (fig. 1) suggests a rnhlange-
like style deformation. Attitudes of bedding and shears show large local
0 variations, but the pattern is not random,and a general northwest dip can
be discerned. Prehnite and pumpellyite are widespread in thia unit. I
Prehnite in veidets, usually associated with quartz, is commonly visible in I
hand specimens and characteristic of the unit. 1 I
The maximum age of the heterogeneous assemblage is indicated by a K-Ar
date of 146 - + 7 m.y. on hornblende from a granitic cobble in a conglomeratic
sandstone near the Seward Highway in the Anchorage A-8 quadrangle (Marvin
Lanphere and Arthur Grantz, U.S. Geological Survey, oral communication',
1969). The minimum age of the unit is limited by the beginning of
accumulation of the wnetamorphosed Tertiary non-marine sediments in the Cook
Inlet region.
Metagraywacke, siltite, argillite, and calcareous sandstones tentatively
correlated with the Valdez Group (KJV) crop out in the southeast part of
'the quadrangle below the heterogeneous assemblage. The rocks are part of
a widespread thick marine flysch sequence that in some areas contains
sedimentary features that are generally associated with turbiditea. Fossils
are very scarce in the flyach deposits, and none have been found in the
Anchorage B-7 quadxangle. Worm trails and plant fragments have been found
in the adlacent Anchorage B-6 quadrangle (Clark and Bartsch, 1971) and
Inoceramus fossils of Jurassic or Cretaceous age have been found in several
localities (Plafkee and MacNeil, 1966, p. B63; Park, 1931, p. 393) in the western
Chugach Mountains. Fossils from a newly discovered locality in the flysch .. I
negr Mile 100 of the Seward Highway (Seward D-7 quadranglej'"'are similar I
to the Upper Crs taceous (Maes trichtisn) Iaoceramus kusiroensis (David L . Jones, U.S. Geological Survey, written comunication, 1970).
Sparsity of fossils and absence of shallciw-water features suggest that
the flysch represents a moderate to deep water deposit.
Deformation in the flysch is characterized by tight similar folds with
slaty cleavage and numerous high- and low-angle faults.
mite mica, chlorite, epidote, and albite are widespread in the unit.
Micaceous minerals commonly show a distinct metamorphic fabric, but detrital
textures are still discexnible.
The non-marine Kenai Formation (Tk) consisting predominantly of
sandstone, siltstanq, ana claystone is exposed in only a few small areas
near Eagle River (fig. 1). Fossil plants from the Kenai Formation near
Eagle River (fossil locality 2, fig. 1) have been described by J. A,
Wolfe (1966) and J. A. Wolfe and others (1966). In these reports, fossils
from the Eagle River locality ate assigned to t1.e "Lower(?) Seldovian" .
Stage, which ia considered to be of late Oligocene age (Wahrhaftig and
others, 1969, p. I)-9 to D-11) . The surffcial deposits include a variety of glacial and alluvial
deposits that are being mapped and described by Ernest Dobrovolny and R. R.
Schmoll.
Igneous rocks in the q.uadrangle include quartz diorites to gabbtos in
the h d i f ferentiated assemblage described above, protrusive ultramsf ic
rocka, and felsic to intermediate hypabyssal rocks.
The ultramafic rocks $Pp) are exposed in a linear belt near the
northwest part of the quadrangle between the undifferentiated rocka and
' the bet erogeneous a~eemblaja. The body is a weakly serpent inired layered
protrusion composed predominantly of peridotite (wehrlice), dunite, and
pgroxenite. Clinopyrsxene is the predominant pyroxene in the body,
Small amounts of gabbro occur locally. No contact metamorphism was noted
in the vicinity of the ultramafic body. A detailed map of the ultramafic
body by Rose (1966) shows the distribution of the rock types
in the ultramafic. Rose (1966) noted a similarity in appearance of
clinopyroxenes in the ultramafic rocks and in the strongly altered gabbros
that crop out northwest of the ultranafic body near Mo&t Eklufna and on the
ridge between Thunder Bird Creek and the Eklutna River. Rose (1966)
considered the gabbros to be a part of the ultramafic body, On figure 1 of
this report the gabbros near the ultramafic rocks are included with other
plutonic rocks i n the undifferent iated- u n i t , This grouping is l i tho log ic
only and not meant t o imply t h a t these gabbros a r e not r e l a t ed genet ica l ly
t o the ul tramafic rocks. Small bodies of f e l a i c t o intermediate .
intrus.ive.rock cut a l l . o f the metamorphic rock units. Most a r e light-
colored fine-grained a l t e r e d rocks compoeed predominantly of plagioclase,
quartz , c h l o r i t e , and s e t i c i t e , and sometimes carbonate, Mafic minerals
a r e commonly absent o r completely replaced, Dacite porphyry containing
hornblende, quartz, and p lagioc lasr phenocrysts occurs i n a few places
along ths range f ron t , bur was not found eleewhere.
S t ruc ture
Two major f a u l t s a r e postu1atecT.h the quadrangle.
The f i r s t is a t h r u s t f a u l t which results i n rocks of the heterogeneous
assemblage overlying younger (?) f lysch deposi ts of the Valdez (?) Gtoup. The
ages a r e not ye t f i rmly es tabl i shed f o r these two groups of rocks so t h e
fault is only infer red at t h e present time. However, the avai lable age da ta
(discussed in an e a r l i e r p a r t of t h i s paper) indfca te t h a t it i s unlikely
t h a t the heterogeneous assemblage is younger than the upper Cretaceous
p a r t s of the f lysch, and t h a t a t h r u s t fault is necessary t o account f o r
the r e l a t i v e pos i t ions of tlie two groups of rocks.
a . The boundary between the heterogeneous assemblage and the undiffer-
e n t i i t e d rocks t o the nor thmet is thought t o be a major f a u l t zone. The
i n fe r red fault jurrtaposes rock types of continental a f f i n i t y (plutonic
rocks, gneisses, and s c h i s t s ) on the northwest against weakly metamorphosed
b a s a l t i c pi l low lavas and rad io la r i an che r t s of oceanic a f f i n i t y on the
southeast . Rocks of cont inenta l af f h i ty are absent i n the heterogeneous
assemblage except as clasbs in metaconglomerate sandstones.
The approximate location of the juxtaposition of the two terranee--
the c o n t i ~ a l undifferentiated unit and the oceanic heterogeneous
assemblage--is marked by the ultramafie body in the northeast part of
the qrudrmgle (unit %PZu). In other places the position of the contact
between the two units is obscured by intense shearing and recrystallization
of roch in both units aa well as lack of exposure in critical areas..
Metallic miaeral occurrences
No meallfc mineral production has been reported from the Ancharage
B-7 quadrangle, but three occurrences are known.
A. W. Rosc (1966) described chromite-rich bands in durulte at two
localities; one on the ridge between Thunder Bird Crkek and Eklutna River,
and the second on the west slope of Morrat Elclutaa (fig. 2). According to ' . , I 1
Rose (%966) , the known chroaclte occurrences are of low grade and -11 size.
- Landes (1927, p. 71) described a lead-zinc preapect located "...at an
elevation of 1,500 feet in a slight draw in the face of the cliff between
EErlutaa and Petets Creeks." The approximate location is shown on figure 2.
Acc~rding to Landes (1927) the country rock is impregnated through a zone
about three feet wide with arsenopyrite , pyrite, sphalerf te, and galena.
A vein less than 2 inches wide contains sphalerite, galena, and chalcopyrite.
Landes (1927) did not think eufficient base-metal minerals were exposed to
encourage development work.
Data on stream sedimeut and rock samples
Standard procedures were followed in the.collection and prepaxation
of samples. Outcrop mmples were chosen for anilysis to provide data on
background or because they were strongly iron atained or contained visible
sulfidae, Descriptions of analyzed rock specimens are given in Table 1.
Stream-sediment earuplee of fine-grained material were generally
collected from active stream c h a ~ e l s ; where this' was not possible, samples
were collected from b+ ox terrace deposits adjacent to the channel.
Rock aamples.were crushed and split, and one split was pulverized.
The pulverized splits of the rock samples and the minus 80 mesh fractions
of the stream-sediment samples were analyzed for 30 elements by the
U. S . Geological Survey' a standard six-step semiquantitative spectrographic
method and fox gold and mercury by the a~tomic abeorption method (Tables
2 and 3) . .The precision of a reported value is approximately plus 100
pexcant or minus 50 percent. Analyses for gald by the atomic absorption
method are accurate to 4 100 percent. Semiquantitative spectrographic
analyses were done by K. J, Cu~ry, and atomic sbaorption d y e a s were done
by R. B. Tripp, H. D. Ring, R. L. Miller, A. L, Meier, and D. G. Murrey.
Locations of the rock and stream-sediment samples are shown on figure
2.
Table 1.--Description of bedrock samples from the Anchorage B-7 quadrangle.
Sample localities are shown by sample number plotted on figure 2.
Map number Sample description
Greenstone, altered zone about 1 to 2 feet wide at contact between two metoigneous rock types.
Greenstone, porphyritic metabasalt. Greeaotone, rnetabasalt ('2) with minor pyrite. Greenstone, metabasalt ( 9 ) with minor pyrite. Hornblende quartz diorite. Greenstone; strongly sheared; hematite stained locally. Metagabbro. Serpentinite. Serpentinfzed dunite(?). Intermediate (?) metaigneou rock, f ine-grained , calcareous, contains minor pyrite, limonite stained.
Same aB lor. Same a8 lor. Pyroxeni te . Peridotite. Peridetite. Altered porphyritic quartz diorite. Massive green metasandstone. Fault gouge. Altered intermediate (?) dike rock. Altered dacite dike xock. Graywacke. Green metasandstone. Alaskite. Homfelsed graywacke.
The results of the analyses of the stream-sediment and rock analyses
have been processed by means of a computer horn as GEOSUM and are
presented in Tables 2 and 3. The GEOSUM program is designed primarily for
summarizing and tabulating geochemical data--especially data from
semiq~ntitative spectrographic analyses (commonly referred to as six-siep
spectrographic analyses) by the laboratories of the U.S. Geological Survey.
The computer output coasiete of: (a) a tabulation of the data, (b) histogram
and cumulative frequency distributiona for inll elements for which there f a
sufficient data, (c) a statistical 8.rmrmary which includes geometric means
I/ and geometric deviations.-
Y ~ h e frequency tables and histogram for gold and mercury have been '
omitted because the classes used in calculating these tables are those used in the semiquantitative spectslographic method, and gold and mercury were analyzed by the quantitative atomlc absorption method. The frequency tables and histograms that contain no valid data points and those for which the minimum and maximum are the same have also been ~ m i t t e d .
e I
Explanation of Tables 2 and 3
Analytical results from rock and stream-sediment samples are given in Tables 2 and 3 as analytical values such as 7.0000 ppm, 10.0000 percent, etc . , or as qualifted values expressed as a letter. These letter codes are N net detected, E 9 less than specified lhit of detection, G n greater than value shown, B 5 no data. The terns H = interference and T = trace, but do not occur in these data. Note that the right-most zero digits for each analytical value may or may nor be significant. The specified limits of detection are as follows:
Specified limits of detection
FE PCT MG PCT CA PCT I
TZ PCT MN PPM AG PPM !
0.05000
AS PPM
200.00
CD PPM .
20.00000
AU PPM B PPM BA PPH BE PPM Bf PPM
CO PPM CR PPM CU PPM LA' PPM MO PPM '
N33 PPM N I PPM PB PPM SB PPM SC PPM SN PPM
10.00000 5,00000 10.00000 200.000 5,08000 10.00000
SR PPM V PPM W PPM - " - P PPM 214 ~fil ZTC PPM
0.02000' 0.01000 Semiquantitative spectrographic analyses by the U.S. Geological Survey are
reported in percentage (pct) or parts per million (ppm) as geometric midpoints (1.0, 0.7, 0.5, 0.3, 0.2, 0.15, 0.1, etc.) of geometric brackets having the boundaries 1.2, 0.83, 0.56, 0.38, 0.26, 0.18, 0.12, 0.83, etc. TI4e frequency distributions and histograms are on logarithmic scales and are computed using these brackets as class intervals, for example:
Reported value (ppm) Limits
* . .... L'~nnlysas by atomic absorption method.
On the his<ograms decimal numbers are shown as powers of 10, for example:
7.OE-01 means 2.0 x 10-I or 0.. 7
0 7.OE 00 means 7.0 x.10 or 7.0
1 7.0E.01 means 7.0 x 10 or 70.0
2 7.OE 02 means 7.0 x 10 or 700.0
3 7.OE 03 means 7.0 x 10 or 7,000.0
The histograms are constructed of X's, each of w N c h represents 1 percent '
of the total number of samples.
The hirstograms and the statistics given below them are derived only from data values within the ranges of analytical determination ("analytical values"). The histograms are, therefore, incomplete, and the statistics are
. biased if data values qualified with N, L, C, T, or H codes.are present. Statistical estimates that are unbiased in this regard are given at the end of Tableo 2 and 3. The geometric mean is the antilogarithm of the arithmetic mean of the logs of the analyses and ag estimate of "central tendency," or of a characteristic value, of a frequency distribution.that is approximately spnmletrical on a log scale, and is therefore useful for characterizing k n y I
geochemical distributions. The geometric mean is not an estimate of geochemical.abundance. The geometric deviation is the antilogarithm of ' the atandard deviation of the logs of the analyses. See USGS Professional . Paper 574-B (Miesch, 1967) for further discussion and USGS Bulletin 1147E (Miasch, 1963, p. 20-23), for further discussion and explanation of geometric
I i deviation. j
\
In the computations performed to produce the statistical summary at the I
. end of Tables 2 and 3 all elements are ignored where one or more of the unqualified data values is less than the analytical limit of detection I specified on input 01: where any data values are qualified with the G (greater I
than) code. Data values qualified with B or H are not used in the computa- I
tions. Wl~ere none of the data values for an element are qualified the mean I
and deviation should be the same as those given in the preceding section, . Where data are qualified tilth the codes N, L, or T, the estimatcs.of geometric
mean and deviation are based on a method by A. J. Cohen for treating censored distributions. The application of this method of geochemical problems is described in USGS Professional Paper 574-B (lliesch, 1967). The estimates are unbiased in a strict sense only whe're the data are derived from a lognormal parent population, but experiments have shown that large departures from this require~nent may not greatly invalidate the results. Acceptance and use of the estimates, however, is the responsibility of the individual.
Anomalous samples
Normal background contents f o r rocks and stream-sediment samples in
the map a rea were determined by inspect ion of the histograms given i n
Tables 2 and 3, supplemented by inspect ion of histograms f o r sampler from
the adjacent Anchorage B-6 quadrangle (Clark and Bartsch, 1971).
Most of the samples t h a t contain grea te r than background mounts of
one o r more elements a r e associated with the ultramafic body. Chroaite-
. r i c h zones a r e known i n the dunite (Rose, 1966). Contents of 5,300 or
mre ppm ( p a r t s per million) of chromium, 1,000 o r more ppm of nicke l , and
150 or more pprn of cobal t a r e ccmrmon i n the ultramafic rocks. Chromium
contes t s of between 300 and 3,000 ppm are conrmca i n t h e s t r e w dra.!:ling
the area of ul t ramafic rock outcrops. Two samples (map nos. 22 and 23)
co l lec ted frqm L i t t l e Peters:Creek contain '700 to 3;000 ppm of chror,.ium,
t h a t is probably derived from ul t ramafic rocks. No ul t ramafic rocks were
found on the p a r t of the r idge between Pe ters ahd L i t t l e Peters Creek t h a t
was examined, but i t is probable t h a t at least small ul t ramafic .bodies are
present.
A mercury content of 1.0 pprn was detected in a stream-sediment sample
(map no. 3) from below the falls i n Thunder Bird Creek. Although no melcury
occurrences are known on ~hunder Bi rd Creek, an occurrence of cinnabar was
reported by Atherton and Judd (1956) i n the tunnel between Eklutna Lake and
the Eklutna power p lan t near the Knik River i n the Anchorage B-6 quadrangle.
A mercury content of 1 .2 pprn was reported f o r one sample (map no. 25) from
Peters Creek.
Weakly anomalous gold contents (0.04 ppm) were found i n two samples
(map nos. 27 and 32) from peters Creek. Cappd (1916, p . 192-193) described
several lode gold prospects on quartz veins near the head of Peters Creek,
approximately 8-1/2 milea upstream from the weakly anomalous samples.
Weakly anomalous contents of silver (0.5 to 1.5 ppm) were detected in
two stream-sediment samples and one rock samgle from the South Fork of ths e
Eagle Uvar'area. The source of the silver in the stream-sediment samples
is not known.
The mercury, gold, and sllvez anomalies discussed above are from a very
few samples wlth weakly anomalous amounts of only on; or a very emall number
of element*. The significance of these samples is not known, but they
should be interpreted with caution.. A few othsr samples in Tables 2 and 3
ate weakly anomalous in one or more metais, and, thq significance of. these .. .
. . ... . values i~ a l so uuknown.
Refeyerices c i t e d
Atherton, 24. S. , and ~udd ' , W e R., 1956, F ina l engineering geology report on the Eklurna project: U. S. 'Bur. Reclamation, unpublished repor t , 109 p ,
Capps, S. R., 1916, The Turnagain-Knik region, Alaska: U.S, Geol. Survey Bull. 642-E, p. 147-194.
1940, Geology of t he Alaska Railroad region: U,S. Geol. Survey Bull. 907, 201 p.
Clark, S. H. B., and Bartsch, S. R., 1971, Reconnaissance geologic map and geochemical analyses of stream sediment and rock samples of the Anchorage B-6 quadrangle, Alaska: U.S. Geol. Survey open-file repor t , 8 p.
Landes, K. K., 1927, Geology of the M i k - b t a n u s k d i s t r i c t : V.S. Geol. Survey B u l l . 792, p . 51-72.
Miesch, A. T., 1963, Dis t r ibu t ion of elements in Colorado Plateau uranium . I I
depoeits-A prel9minarg repor t : U.S. Geol. Survey B u l l . 13474, 57 p .
1967, Methods of computation f o r es t imat ing geochemical abundance: , U . S , Geol. Survey Prof. Paper 574-B, 15 p . 1 ,
Q z ~ w ~ , Tomwas 1970, Notes on the phylogeny and c lass i f . i ca t ion of t h e super- family Verbeekinidea: Kyusho Univ. Fas. ~ c i . Ma., Geology, Sax. D, v. ,20, no. 1, p. 17-58.
Park, C. F., Jr., 1933, The Girdwood d i s t r i c t , Alaska: U.S. Geol. Survey B u f l . 849-G, p. 381-424.
Plafke t , George; and MacNeil, F. S. , 1966, strati .gr&hic s ign i f icance of Tertiary f o s s i l s from the Orca Group i n the Prince W i l l i a m Sound region, Alaska: U.S. GeoP. Survey Prof. Paper 550-B, p. B62-B68.
Rose, A. W . , 1966, deology of chromite-bearing u l t r w i c rocks near Eklutna, I
Q Anchorage quadrangle, Alaska : Alaska ' ~ i v . Mines and Minerals, Dep t . I
Nat. Resources Geol. Repr. no. 18, 20 p.
W.ahrhafti.g, Clyde, Wolfe, J. A., Leopold, Ee B.,, and. Lanphere, Me A . , 1969, The coal-bearing group i n the ~ e n a n a coal f i e l d , Alaska: U. S . k o l . Survey Bull . 1274-D, p. D9-D11.
' ~ o l f e , J, A * , 1966, Te r t i a ry plants from the Cook Inle t region, Alaska: U.S. Geol. Survey Prof. Paper 398-B , p . 81432.
Wolfe, J. A., Hopkins, D. M., and Leopold, E. B., 1966, Te r t i a ry stratigraphy and paleobotany of t h e Cook I n l e t region, Alaska: U.S. 'G~OL. Survey Prof . Paper 398-8, p. A1-A29.
x
~O
O~
~O
~~
OO
O~
~~
OO
~~
OO
~O
~O
~O
OQ
OO
O~
OO
OO
OO
~O
~~
~~
~~
~~
~~
~
ao
00
00
00
0o
oO
OO
o0
00
o0
oo
Oo
~O
Co
oO
OO
3C
)o
OO
OO
Oo
oo
oo
oo
oo
oa
0
00
0a
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
a0
00
00
00
00
00
0
40
00
00
a0
00
0q
99
~9
94
99
93
49
93
99
94
04
99
~~
~~
~~
~~
0~
~
m.
. .
..
.I
I
..
OO
OO
OO
OO
OO
OO
OO
OO
OO
OQ
OO
OO
OO
OO
OO
OO
OO
Od
OO
OO
OO
OO
O~
O~
O~
m
oo
oo
oo
oo
o~
mm
mo
oo
oo
o~
a~
oa
o~
~~
~o
~~
~~
~~
~o
~~
oo
o~
o~
oo
o
-m
mm
mm
mc
m~
m-
-r
ew
cw
mm
m~
mm
wm
~m
ec
cc
b~
~m
mm
m~
mm
~~
ec
m~
mm
~~
tz
tz
zz
%~
tz
zx
zx
zx
lz
zz
~2
z~
Zz~~LZ2~2ZtZ%~2ZZtZ2OzX~P
00
00
00
0
00
00
00
00
00
00
00
0 OOOOOOOQB0O00050000000.300
00
00
00
00
00
00
00
00
0~
00
~0
00
00
00
00
00
00
00
a0
00
0a
00
00
0m
a0
0
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OC
OO
OO
OO
~O
OO
OO
OO
~3
OO
OO
OO
OO
O
RO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OP
O~
O~
~O
OO
OO
OO
OO
OO
OO
O~
O
4a
.r
or
.~
r*
**
r.
.*
*a
*o
m1
r*
re
.s
..
.
OO
OO
OO
OO
O~
~~
~~
OO
OO
OO
~~
OP
OO
OO
OO
O~
OO
~~
~~
~~
~~
~~
~~
~~
~~
0
O0
00
00
00
00
00
00
00
00
00
00
00
O0
00
00
00
00
00
00
05
00
00
00
0a
0
WW
NN
HN
NN
NN
NN
HN
NN
NN
NN
NN
NN
NW
NN
NN
NN
NN
WN
NN
NN
NN
NN
WN
NN
NN
OO
OO
O
00
00
0
OO
OO
O
qooao
*.
.*
0
00
00
O
OO
OC
)
0000~ .
dd
dl
I 2
sl
m
~~
-~
~~
-~
C~
~~
~~
~~
~c
~r
r~
r~
~~
rr
~r
~e
r~
~~
cc
rr
r-
-C
-
....
....
....
....
....
. I
..
..
..
..
..
*.
.,
**
.
*.
..
*.
w
V1
't
r
0t
~~
0~
w=
~o
t~
~~
~~
~o
ow
~b
5b
bb
0o
00
e0
o0
u0
o0
e0
oo
wo
oo
oo
~~
m
- rl
o0
03
0D
oU
00
oo
~o
oo
oo
o0
QO
OO
oO
OO
OO
o~
mD
OO
OO
D~
oo
oa
oo
oo
oo
~
P
00~~0c00~0000030000t000~~~0e00~00~000~0000~00~0~00~
m
r
0~
0~
0~
00
0~
00
00
00
00
~0
00
00
0~
00
~0
00
~0
0~
00
t0
00
~~
~0
~0
~0
~~
rrrt-
rr
rr
~r
~
r
r
rr
rr
rr
z
zr
~r
r
.-
rr
rx
z
t:
CC
C
CI
C
u
-cc
P
CC
r
C
CC
r
WL
~~
~W
DO
~d
~O
W4
ON
WO
J~
OO
O~
Or
lO
O4
OU
Y4
4O
~4
OO
4~
W~
W~
4~
4O
~~
.
.*
I.
.*
*.
QC
~~
OO
~O
OD
OO
OO
OO
OO
O~
~O
~D
OO
~~
OO
~~
OO
O~
OD
OO
~~
~~
O~
~O
O~
~
OOOOOOOOOOOOOOOOOOOOCOOOOODOOOOOOOO~OOOOOOODOO~OO~
~O
BO
OO
OO
OO
OO
OO
0O
00
00
~O
OO
OO
OO
OO
~O
OO
OO
DO
OO
OO
OO
O~
~O
OO
~
DO
~O
OO
OO
OO
OP
O~
~O
~~
~~
~O
~O
OO
OO
OO
~~
OO
OO
OO
OO
~~
~~
~O
~~
~~
~
x
z*****.**
OO
OO
OO
OO
r
dr
rl
dd
wd
X"dZ4ddddA
1 a
Oo
oO
OO
QO
O
OO
OO
OO
OO
O
OO
OO
OQ
O
59
99
99
33
3
cnmmmmmmm
2
~0
00
00
00
0
PO
OO
OO
OO
O
00
0e
00
00
3
0O
O0
00
00
U
r*
ao
o*
*r
ln
0O
OQ
OO
O
-mbmmQem
rn
d
I
5d
oO
oO
ee
o
e0
a0
00
00
0
d9
00
00
00
O
OO
OO
OO
OO
U
.*
~t
**
**
O
Od
QO
OO
ln
N
NN
CIr
nr
nN
d
rezzzrrzt
POOOOOOOO
eO
QO
oO
Oo
O
00
00
00
00
P
OQ
OO
OO
OO
2
VI 2 244
A
A
a
PO
OO
oo
ae
O
a
a
U
00
00
3Q
OC
3
a
OO
OO
OO
OO
U -
- ul w
oe
oe
oq
m....g
t
- d
dr
@d
ur
r
TABLE 2. AXCHURAGE
MAP NO- SAMPLE 51 BAN229 52 AKC546 53 &AN227 54 BAN214 55 BAN228 56 BAN126 57 BLt4LZT 58 BAN129 .
PB PPA 30.0000 30 -0000 30.0000 30.0000 50.0000 30.00L)O 30.0000 15.0000
SB PPM 100,0000N 100.0000N IOO.OOOON IO0,OOOON 100.0000~ 100.0000M 1 0O.OOOOH 100.0000M
S STATPAC
SN PPM 10.0000N 1C-OWON 10,0000H 10. OOOON 10.0000N 10.0000N 10.000DN 10-0000H
w PPU so. 0000W 50.0000N 50.0000~ SO.OOOON SO~OOOON 50.000QN 50.000ON 50.00OON
DATE
Y PPR 15.0000 lS.0000 15,0000 20,0000 20~0000 15.0000 20.0000 15,0000
* w
wm
z
gs
z 03 11-
so
* mot-
* **>
rm
w~
u
=a
C%
X
UX
Y
OX
%
XYX
4
XY
X
u
XX
X
.x x
x '
- X
XX
x
xx
x
m rxxx
XX
XX
X
KY
*
nx
x~
d
xx
xx
x x x
X
x x
z
YX
X
L
xn
x
3 *x*z:: 0
xx
xx
U
C
Z
w s
111
0
IY
V)
2
4
w
1
C
VI . rl I
w m
4
CU
J
- m
C4
e
0
2
U
2
X x
x x
x x
X
x
X x
X
X
x
X
x
xx
Y
XX
X
YX
' x
xx
X
XY
X
XX
XX
x
xx
x
xx
xx
X
XX
X
0
mN
u
eo
m u
x
x x
c.
x X
Y
X
r x
X
xx
0
XX
0
XX
X
XY
6
XK
XX
%
%X
I
- X
XY
Y
XX
YX
X
XX
X
P
XX
XX
X
XX
X
XX
XY
X
X I
X
XX
YX
X
XX
X
2
xL
Ix
*x
Y
x X
XX
XI
X
a
XX
YY
XX
J
'Y
XX
XX
X
0
XX
X*
XX
U
' 1470 GEOCHEHICAL SUHIARY - U S G S STATPAC ( 0 4 / 1 2 , 7 1 1
l l T L E ANCHORAGE 0-7.STREhH SEOIWEHT
FREQUENCY TABLE FOR GOLUPIN 10 1 BA P P I )
L I N I ~ S FREO FREQ PERCENT LOYER - UPPER - cun FREQ
i . 8 ~ OL Y 2 . 6 ~ n l o o 0.0 2.6E O f - . 3-8E 01 0 0 0.0 3.8E 01 - 5 - 6 E 01 0 0 Q.0 5.6E OL - 8-3E 01 0 0 0.0 6.3E 01 - 1.2E 02 0 ' 0 0.0 1 . 2 E O 2 - 1-BE02 4 4 6.90 1.8E 02 - 2-6E 02 1 5 1 - 7 2 2 . b E O 2 - 3 0 8 E 0 2 2 4 29 4 1 - 3 6 3.8E 02 - 5-6E 02 11 40 18-91 5 . 6 E 0 2 - %-3E02 18 58 31-03
PERCENT FREQ CUU
0-0 0-0 0.10 0.0 0.0 be00 8 - 6 2
SO. 00 68-97
100.00
HISTOGRAM FOR COLUMN 10 I 8 A P P I 1
1.5E 0 2 HUXXXXX 2-OE 02 XX 3.OE 02 XXXXXXXXXXXXXXXXXXXXXXXIKXXXXXXXXXXXXXXXX 5.0f 0 2 XXXXX~XXXXXXXXXXXXX 7 . u ~ a 2 xxxxuxxxxxnrxxxxxxxnxxxxxxxxxxx
""
-
-
C
0
ura
I u
Xl
ll
W
O - -
-J
JQ
'O
C
W *
WO
O
-0
U
3
1
ha
x
ay
lu
a
LY
479
a a
r a
a d
V
W
5:
.
co?
0
A G I O GEOCHEMlCAL SUMMARY - U S G 5 SIATPAC i 0 4 1 1 2 ~ 7 1 1
TITLE . fiNCHORAGE 0-7.STREAn SEDIREUT .
FREQUENCY TABLE FOR COLURY 14 t CO PPM I
L I H I T S FREQ LOUER - UPPER
3 9 8 E 0 0 - 5 - 6 E 0 0 0 5.6E00- 8.3E00 0 8.3E00- t - 2 E 0 1 0 1,2E 01. - 1-BE 01 1 1-8E 01 - 2.bE 01 9 2.6E 01 - 3.8E 01 48
FREQ cun
0 ' 0
0 1
10 58
PERCENT FREQ 0.0 0.0 0.0 I. 12
15.52 8.2. 76
HlSTOGRdH FOR COLUMN 14 I CO PPW 9
L.5E OL X X 2.OE 01 X X X K X X X X X X X X X X X X 3.OE 01 XXXX%XXX%XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX~XXXXXXXXXXXXXX%XXXXXXXXXXXXXXXXXXX
ANALYTICAL N L H I T G VALUES 0 0 4 0 0 0
0.0 5a
0.0 0.0 0.0
& -
HAXlnUR = 3-00000E .OC MINIhUH 1-SOOOOE 01 GEOHETRIC UEAN a 2.78355E OX GEOHErRlC OEVIAIIOM a 1-18486E 00
A470 GEOCHEHlCAL SUMNARY - U S G S STATPAC i04/tZ/YLI
T I T L E ANCHORAGE 8-?,STREAH SEDIMENT
L I ~ I ~ S FREQ FREQ LOUER - UPPER CUM
3 . 8 E 0 0 - 5 . 6 E 0 0 0 0 5 . 6 E 0 0 - 8-3E00 0 0 0.3E 00 - 1.2E 01 0 0 1 - 2 E 01 - 1-8E 01 3 3 1.8f 01 - 2.6E 01 2 5 206E 01 - 3,BE OL 6 ' i f 3.8E 01 - 5-6E 01 6 17 5.6E 01 - 8-,3E 0k 21 38 8.3E 01 - I.2E 0 2 19 5 1 1 . 2 ~ 0 2 - i . a ~ o z L 58
HISTOGRAM FOR COLURH 1 6 i CU P P I D
PERCENT . FREQ
0.0 0.0 0.0 5 - 1 1 . 3.45
10.34 10. 3 4 3 4 - 2 1 3 2 - 1 6
1-72
PERCENT FREQ GUN
0.0 0.0 0.0 5-17 B.62
11-97 29-31 65 152 96-28
lao.ao
xxxxx X X X
. X X X Y X X x X X X
. X X X X X X X X X X X X X X x X X X X X X X X X x X X X x X x X X x X X x X X X X X
! XXXXXXXXXKXXXXXXXXXXXKXYXXXXYXXXX '
! xx
AN4EVYLLAL G VALUES 0 . $8
0.0
GEOMETRIC MEAN = 6.23728E 01 GEOHETRIG DEVIATIUN 1.73961E 00
DATE 4 /21 /71 .
DATE 4 / 2 1 / 1 1
L I ~ I T S FREQ FREO PERCEtdl PEICENI LOUER - UPPER C UH F%EQ F R E P C U ~ ~
8-3E 00 - 1 - Z E OL 52 52 69-66 89-16 1 . 2 ~ 01 - 1 . a ~ 01 I 5 3 1-72 91.3~
ANALYTICAL Al L H 0 0
T 5 0 0
G VALUES
0.0 0
8-62 0 53
0.0 0.0
MAXIHUH = 1.50000E 01 nlmnun a i.oooaoE 01 GEOMETRIC HEAW a 1.00765E 01 .
(J GEOMElRlC OEVIArIOH = 1.05784E 00 &-
r l r L E ANCHORAGE 6-TISCREAM SEDIMENT
FREQUENCY TABLE FOR COLUMN 2 0 4 ~i PPU I
L I M I T S FRfQ FREQ . PERCENT LONER - UPPER .CUM FREQ
3.BE 00 - 5.6E 00 0 0 0.0 5 0 6 E 00 - 8-3E 00 Q '1 0.0 B . 3 E 0 0 - 1 - Z E O L 0 ' 0 0.L 102E 01 - 1-BE 01 0 0 0.0 1oBE OL - 2-bE 01 0 0 0.0 2.6E 61 - 3.8E 6 1 3 3 5. 17 3.8E 01 - 1-6E 01 7 10 12-07 5.6E 01 - B-3E 01 15 25 25.86 8.3E Oi - 1.ZE 02 2 1 4 6 36-21 1 . 2 E 0 2 - 1 . B E 0 2 12 58 20.69
P f R C t N l FREQ CUM
0.0 0.0 0.0 C.0 0.0 5.17
1 7 - 2 4 43.10 1 9 - 3 1
100.00
HISTOGRAM FOR COLUHN 20 I N I PPM 8
3.0E 0 1 XXXXX S.OE Oi XXXXXXXXYXXX
ANALYTICAL T G VALUES o o sa
0. 0 0.0.
A 4 1 0 GEOCHEHlCAL SUNNlRY - U S ' G S STBTPAC ( 0 4 / L 2 t T i l
I I TLE ANCHORAGE B-PsSIRfAH SEOlMEWT
FREQUENCY TABLE FOR CULUHN 2 1 'I . PB PPH I
L EMITS FREQ F R ~ Q PERCENT LOWER - UPPER CUn FREQ
8 . 3 E 0 0 - 1 0 2 f E 0 1 5 5 80 62 1.2E OL - 1-BE 01 13 1B 22.41 i . 8 E 01 - 2.bE 01 8 2 6 13.19 2 o b E 01 - 3eBE 01 16 42 27.59 3.aE 01 - 5.bE 01 LO 5 2 11-24 5-(rf OL - % o f € 01 1 5 3 1.12 8 .3E 01 - 1-2E 0 2 0 53 0.0 1 .2E 02 - 1.8E 02 0 53 L - 8 F 0 2 - 2 .6E02 L 54
1.5E 01 XIXXXXXXXXXXYXXXKXKXXX 2.OE 01 XXXXXYXXWXKKXX 3.OE 01 ~ X X X X ~ X X X X Y X X X X X X ~ X X X X X ~ W ~ X X 5.OE 01 YXXXKXYKXXXXKIXXX 7.0E 01 XX '
1 - 0 E 0 2 1,SE 02 2.OE 02 X X
ANILYY ICAL r G VALUES 0 0 54
0.0 0.0
HAXIHUH = 2 . 0 0 0 0 0 E 02 i4lNlMUH = 1.OOOOOE 01 GCOHETRIC UEAN = 2 . 4 9 7 6 6 E O I GEOMETRIC D E V I A I I O N 1 . B l l 5 8 E 00
T I T L E ANCHORAGE B-7rSTREhH SEDIMENT
FREQUEMCY TABLE FOR COLUMN 23 '1 SC PPH 1
L ln l rs L W E R - UPPER
3-BE 00 - 5-6E 00 5 . 6 ~ ~ 0 - 8 . 3 ~ 0 0 8 - 3 E 0 0 - 1 - 2 E O l 1.2E 01 - 1-8E 01 l.0E 01 - 2.6E 01 2 . 6 ~ 0 1 - i . 8 ~ 0 1 3-aE 01 - 5-6E 01
FREO FREQ PERCENT CUIl FREQ
0 0.0 0 0.0 0 0.0
11 18-91 31. 34 48 5 1 44-83
' 5 8 1- 72
PERCENT FREQ CUR
0.0 0-0 0.0 f8.97 53.45 98-28 LOO. 00
HISTOGRIH FOR, COLUHH 23 L SC PPR 8
I
aNILYIICIL N L H I T G VALUES 0 a 0 0 0 Q 5s 0.0 0.0 0-n 0.0
DATE 4/21/71
A470 GEOCHEMICAL SUMMARY - U . 5 G S STATPAC ( 0 4 / 1 2 / 7 L )
T ITLE '
ANCHURAGE 0-7rSTREAH SEDIMENT
FREQUENCY TABLE FUR COLUMN 25 1 SR PPM I
L I M I T S FREQ LOUER - UPPER
8.3E 0 1 - 1.2E 0 2 0 1.2E 0 2 - 1.8E 02 6 1-BE 02 - 2-6E 0 2 22 2.6E 02 - 3,BE 0 2 18 3.8E 02 - 5.bE 0 2 1 1 5.bE 02 - Bo3E 02 1
FREQ c un
0 b
26 4 6 57 58
PERCENT FRf Q 0.0
10.34 37.93 31.03 18.97
1 - 7 2
PERCEMT FREQ CUM
0.0 10.34 48.28 79.3 l 9 8 - 2 9
100.00
Hi5TOGRAM FOR COLUMN 25 t SR PPH )
1.5E 02 XXKXXKXXXX 2.OE 02 XXKXXXXXKKXXXKKXKXXKXXIKKXXKXWXXXKXXXX 3.OE 0 2 XXKXKXXXXXXXXKXXIXXXXXXXXXXXXXK 5.OE 02 XXXXXXXXXXXXKXXXXXX 7.OE 02 XX
nAxtnuW = T.OOOOOE 02 MINIMUM = L.50000E 0 2 GEOHETRIC HEAN = 2.67669E 02 GEOHETRIC DEVIATION = L.49884E 90
AMALYT ICAL G VALUES 0 50
0.0
DATE 4 / 2 1 / 7 1
A470 GEDCHEHICAL SUMMARY - U S . G S STATPAC tO4 /12 /71 )
l.1 TLE ANCHORAGE 0-7rSIREhH SEDIMENT
FREQUENCY TABLE FOR COLUMN 26 I W BBR )
L I M I T S FREQ FREQ PERCENT LOWER - UPPER tun FREQ
8.3E00- 1 . Z E 0 1 0 0 0.0 1.2E 01 - 1.8E OL 0 0 0.0 1m8E 0 1 - 2,bE 01 0 0 0.0 2.bE 0 1 - 3 - % E 01 0 0 0.0 3.8E OL - 5.6E OP 0 0 0.0 5-6E 0 1 - 8.3E 0 1 0 0 0.0, 0.3E 0 1 - 1.2E 02 0 0 0.0 1.2E 0 2 - 1-BE 0 2 2 2 3.45 1 . B E 0 2 - 2 . 6 E 0 2 11 19 29.3 1 2.6E 0 2 .- 3.8E 02 39 58' 67-24
PERCEHT FREQ cum
0.0 0.0 0.0 0.0 0.0 0.0 0.0 3.45
32.76 lOO.00
HISTOGRAM FOR COLUMH 26 t V PPH B
1.5E 02 X X X Z.OE 02 X K X X K X X X X X X X X X X X X X X X X K X X X X X X X 3.OE 02 XXXXKXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXKXXXKXXXXKXXXXKKXXXXXXXXK
ANALVTICAL N L H I T G VALUES 0 0 . 0 0 0 0
0.0 0.0 0.0 0.0 58 . *.
MAXIMUM = 3.OOOOOE 0 2 MINIHUH = 1.50000E 0 2 GEOMETRIC MEAN = 2.60087E. 02 GEOMETRIC DEVlA l IOH = 1.23682E 0 0
DATE 4 / 2 1 / 7 1
A 4 7 0 GEOCHEHlCAL SUMMARY - U S G S STATPAC (04/12/11t
T I T L E I
ANCHORAGE 0-7rSTREAH SEDIMENT
FREQUENCY 'TABLE FOR COLUHN 28 1 Y P P I I
L I U I T S . FREQ FREQ PERCENT PfRCEYf LOWER - UPPER cun FREQ FREO cum
8-3E 00 - 102E -01 1 1 1.72 1.72 1 - Z E 01 - L-BE 01 11 1 2 18-91 20.69 1 -8E OL - 2.6E 0 1 34 46 56-62 7 9 - 3 1 2 -6E 01 - 3.8E 01 1 2 58 20.69 100-00
HISTOGRAM FOR COLUMN 28 t Y PPh )
1.0E .01 xx 1.5E 01 XXXXXXXXXXXXXXXXXXX 2.OE 01 XXXXlXXXKXXXXXXXXlXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXNXX 3.OE 01 XXXXXXXXKXXXXXXXXXXXX
N L H 0 T AMALYTICIL 0
6 VALUES 0 0 0 0
0.0 0
0.0 50
0.0 0.0
MAXIHUH = 3.00000E 0 1 M l N l H U H 1*00000E 01 GEORETRIC MEAN = 2-03503f OL GEOMETRIC OEVI&TIOH 1.27425E 00
- X
x
x X
r
X x
a
X X
a
*: x
X K
w
X X
C
J x
X
X
X
- x
X
X X
0
XX
m
x
x
XX
XX
X
XX
X
d
W1 ., N.
d@
I-
Nd
N
oas n
XX
XX
X
2
XX
XX
X
L
XX
XX
X
3
XX
XX
X
XX
XX
X
CI X
XX
XX
U
d
NN
NN
*
ooooo
DATE 4 / 2 1 / 7 1
T i TLE ANCHORAGE 8-7.STREAM SEDIMENT
I N THE COUPUTATEDNS PERFORRED TO PRODUCE THE FOLhOYlMG TABLE OF GEOMETRIC MEAHS AND DEVIATIONSe A L L ELEMENTS ARE IGNORED WHERE ONE OR MORE OF THE UNQUALIFIED DATA VALUES i s LESS THAN THE ANALYTICAL Ltnlr OF DETECTION SPECIFIED ON INPUT DR WnERE ANY DATA VhLUES ARE U U A L I F l E D WITH THE G'RGREATER THAN8 CODE. DATA VALUES Q U A L I F I E D WITH B OR H ARE NOT USED I N THE CORPUTATIONS. WHERE NONE OF THE OAT4 VALUES FOR AN ELEMENT ARE Q U A L I F I E D THE HEAN AND O E Y t A T I O N SHOULD B E THE SAHE AS THOSE GIVEN I N THE PRECEDlNG SECTION- WHERE DATA ARE Q U A L I F I E D WITH THE CODES NI L e OR T t THE ESTIH&TES OF GEOMETRIC HEAN AND DEVIATION ARE BASED ON B MEFHOD BY A. J. COHEN FOR TREATING CENSORED DISTRIRUTIOMS. THE APPLlCATPON OF T H I S METHOD TO GEOCHEMICAL PROBLEHS I S DESCRIBE0 IN USGS PROFESSlONAL PAPER 574-0. THE ESTIMATES ARE UNBIASED I N A STRICT SEHSE ONLY WHERE THE DATA ARE DERIVED FROM A LOGNORMAL PARENT POPULATIDNI BUT E X P E R I H ~ ~ T S HAVE SHOWN THAT LARGE DEPARTURES FROM THIS REQUIREMENT MAY NOT GREATLY I N V A L I D A T E THE RESULTS ACCEPTANCE AND USE OF THE ESTIMAtES. HOWEVERI I S THE I E S P D N S I B I L I T Y OF THE INDIV IDUAL.
ELEMENT
FE PCT MG P C 1 CA PCT r l PCT HN PPH
B PPH BA P P I BE PPH CO P P I CR PPH cu P P n NB PPW M I PPH PB PPR S t PPH SR PPM
V PPH Y PPH
ZR PPR
ELEMENT FE P C 1 nG PCT L A PCT T I PCT HN PPM
0 PPM PA .PPM RE PPM LO PPH CR PPll GU PPM 18 PPPs ilat BPM PE PPM SC PPW SR PPH
GEOklETRIC D E V I A T I O N
1.40 1.53 1.81 ****** 1.29 1.69 t.60 1 - 4 8 1.16 2.64 1 - 7 4 1-09 1-53 1-97 1 - 3 4 1-50 .
ANALYTICAL G YALUES
REMARKS 5 8 SAHPLES AND 58 ANALYBfCAL VALUES. 5 8 SAHPLES AND 58 AWALYKUCAL YALUES. 50 SAMPLES AND 58 ANALYTICAL VALUES. 1 GREATER THAN VALUES. NO COWPUKATIONS.
58 SAMPLES AND 58 ANALYTICAL VALUES. 58 SAHPLES AND 58 ANALYT!CAL VALUES. 58 SAHPLES AN0 58 ANALYTICAL VALUES. 34 MOT DETECTED, LESS THANI 08 TRACE YALUES. 24 REPORVEO VALUES* 58 SAHPLES AND 58 A N I L Y T I C A L VALUES. 58 SAMPLES AND %B A M A L Y T i t d t VALUES. 58 SAMPLES AND 58 BMWLYTXCAL YALUES.
5 NOT OETECTEDs bE55 THAN1 OR TRACE VALUESO 53 REPORTED VAkUESs 58 SAMPLES AND 58 AWBLYTI&&L VALUES, 4 NOT DEBECTEDv LESS BHAlo OW BRACE VILUES. 54 REPORTED VALUES.
5 8 SAMPLES AND 58 AMAkYFBthL VBLUES, 58 SAMPLES AM0 5 1 ANALYTICAL VALUES.
- -
V PPH 260.086914 1.24 Y PPM 20.350281 1.27
Z R P P ~ ~ 6 2 . ~ 1 ~ 8 6 8 1 - 4 2
58 SAMPLES AND 58 ANALYTICAL UILUES- 58 SAMPLES AND 58 ANALYTICAL VALUES. 58 SAMPLES AND 58 ANALYTICAL VALUES*
mi
i-
e r
e;>
;;*-e-e
e
i r
;;
;'-
ei-
o<
i O
OO
OO
QO
WO
OO
OO
OO
OO
OO
OQ
OO
O
wo
ma
mm
o~
~+
m~
~~
~m
oa
ao
~o
ao
~0
00
00
00
aO
OO
00
00
00
00
O0
00
0
8.O
OO
Oo
Oa
oo
OO
Oo
OO
aO
OO
OO
oo
o
OOQOOObOOOOOOOObOOOOoOOO
-POOOOOOOQOOooOOOo0OOOOOO
Zs
*e
es
es
*s
o~
~s
**
ss
**
se
se
e
00
00
00
00
00
00
Q0
00
00
00
00
00
m
~~
~-
mm
oo
o~
mo
oo
m~
~~
mw
m~
m
- eo-
mot-
rr O
N
4
M
~z
z~
zz
ZX
zZ
2z
Zt
xz
Zz
Zr
Zz
2Z
Z
a0
00
00
00
00
e0
00
00
00
00
00
Og
q
EO
Ow
OO
OQ
OO
om
OO
OO
OO
oO
OO
OO
O
00
00
~0
0O
00
00
00
00
00
00
0~
~0
P
a0
OO
OO
oO
OO
Oo
OO
OO
oO
OO
Oo
OO
U
o*
.r
~o
.s
**
ss
s*
~e
e*
sQ
*a
e~
~
o~
OO
~d
00
0O
O0
~0
0o
00
od
oo
OO
a
NN
NN
NN
NN
NN
NN
NN
NN
NN
NN
NN
NN
Vt X
Zz
Zz
ZZ
ZtP
zZ
fZ
z~
zZ
zZ
zz
ZZ
zz
O
OO
QO
OO
QO
OO
OO
OO
OO
OO
OO
OO
QO
3
a0
00
00
00
00
00
00
G0
.0
00
00
00
00
O
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
OO
O
I m
oo
~o
ao
oo
oo
oo
oo
oe
~o
~~
~~
~~
~
em
vo
~o
re
rn
e~
r~
os
~~
~~
~~
~~
~
r
VI
00
00
00
00
0Q
00
00
00
00
00
00
00
W
O
QO
OO
OO
OO
OO
OO
OO
QO
OO
OO
OO
O
a
A
44
d-d
dd
dd
dd
rlM
d4
dd
dd
dd
dd
d
TABLE 3. ANCHORAGE 8-7rROCK SAMPLES
DATE 4123171
SAMPLE BhJLO1 BAN0 11 BAMOlO BAN009 BAN156 AKCO3b AKtO35 BAN173 BAN168 81W153 8AW152 BAN154 8ANZOS BAN203 BAN176 AKC039 AKCOLZ hKtO3O AKC031 AKCO42 BAN013 AKC032 AKC034 AKCOC?
6 .
AU PPH * HG PPM* O.OZOOL 0.12 0.0t00L 0.22 0-OZOOL 0.12 0.0200L 0.20 0*0200L 0.10 0. OZOOL B 0I0200L 3 0.02001 0.09 0.0200L 0.11 00020OL 0.10 OIO2OOL 0 . s . . 0-0200L 0.30 0.OZWt. 0.22 0.0200L 0.14 0.0200~ 0.55 0-O2OOt B 0.0200L B 01 O200L B 0*0200L a 0-02OQL B 0.02001 0.13 OIOZOOL B 0. OZOOL B. . 0.0200L B
><
LI
* ii.
XX
X
CX
YY
U
XX
X
0.
X
Y
Y.
x
xx
W
XX
X
YX
YY
X
XX
-
x
XX
X
X
XX
X
LI
X
XX
X
X
XX
X
x
XX
Y
YX
XY
X
XX
XX
X
YX
XX
Y
2
MX
*X
X
X
XX
XX
X
XX
XX
X
2 w
xx
vx
0
XX
XX
X
a YIC
O*z
A09
zg
z 0
,
OO
ll
C
00
*
nor-
* m
a,
4
mw
u
X 0
A470 GEOCHEHICAL SUMMARY - U s G S STbTPAC 1041tZ tT l i DATE 4123/71
T I T L E ANCHORAGE B-7tAOCK ShMPLES
FREQUENCY 1ABLE FOR COLUMN 2 I HG PCT b
LIMITS FREQ FREQ PERCENT LOHER - UPPER CUM FREQ
I.~E-OZ - ~.&E-oz o 0 . 0.0 2-6E-02 - 3.8E-02 0 0 0.0 3 .8E~02 - Sob€-02 0 0 0.0 5-6E-02- 0-3E-02 0 0 0.0 8.3E-02 - 1.2E-01 0 0 ' 0.0 1-ZE-01 - LeBE-01 0 0 0.0 1.8E-01 - 2-6E-01 0 0 01 0 2.M-0k - 3.8E-01 Q 0 0.0 3.8f-01 - 5.bE-01 0 0 0.0 5-6E-01 - 8.3E-01 0 0 0.0 8.3E-OL- 1 .2E00 3 3 12.50 1 . 2 E 0 0 - 1 - B E 0 0 ' b 9 25 00 l . B E 0 0 - 2 .6E00 1 10 4-17 2-6E 00 - 3.8E 00 4 14 16.67 3 . 8 E 0 0 - 5 - 6 E 0 0 1 15 4.17 5 . 6 E 0 0 - 8.3E 00 4 '19 . 16-61
HISTOGRAN FOR COLUMM 2 i MG PC? 8
PERCENT FREQ CUM
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
b
0.0 12.50 37.50 41 67 58-33 62-50 79-11
1.OE 00 XXXXXXXXXXXXX 1.5E 00 XXXXXXXXXXXXXXXXXXXXKXXXX 2-Of 00 XXXK 3.OE 00 XXKXXXXXXXXXXXXXX 5.OE 00 XXKX 7.OE 00 XXXXXXXXXXXXXXXXX
ANALYTICAL M L H 0 . T G VALUES 0 0 0 0 0 S 19
0.0 0.0 0.0 20.83
HAXIHUH 7.000QOE 00 MINIHUM 1.00000E 00. GEOMETRIC MEAN = 2.43557E 00 GEOMETRlC DEV1ATION 2.02613E 00
. .
-- -- x
iix
x
xw
x
XX
X
XX
x
YY
Y
YY
w
A&
NN
Wd
~d
dd
40
~d
00
0~
d
WO
OO
OO
OO
OO
OO
OO
OO
OO
X
I1
II
II
11
1
ow
uw
~U
1w
LY
ww
ww
ww
~w
ww
~
a-
ar
n~
ma
m~
m~
ma
ma
m~
~
................. m
tn
~e
r~
mt
nm
+d
~r
nm
m-
-
A470 GEOCHEMICAL SUMMARY - U S G S STATPAC 404/12/111
TITLE ANCHORAGE B-?rROCK SAMPLES
FREQUENCY TABLE FOR COLUMN 4 I T I PCT 1
L I M I T S LOWER - UPPER
t.8E-03 - 2.6E-03 2-6E-03 - 3.0E-03 3-8E-03 - 5-6E-03 506E-03 - %.3E-03 8.3E-03 - 1.2E-02 1.2E-02 - 1,BE-02 1.BE-02 - 2.6E-02 2.6E-02 - 3.8E-02 3-8E-02 - 5.6E-02 5-6E-02 - 8.3E-02 8.3E-02 - I.2E-01 1.2E-01 - 1-8E-01 LOBE-01- 2-bE-01 2-6E-OL - 3.0E-01 3.8E-01 - S16E-01 5-6E-01 - 8.3E-01
FREQ FREP CUR
0 ' 0 0 0 1 1 1 2 0 2 0 2 0 2 0 2 1 3 2 5' 0 - 5 1 6 3 9 4 13 4 11 7 24
HlSTOGRAH FOR COLUMN 4 I T I PCT B
5-OE-03 KKXX 7oOE-03 XKXX 1 .OE-02 1 - 5E-02 2 OE-02 3.OE-02 5.OE-02 XXXX 7. 0E-02 XXXXXXXX 1.OE-01 1.5E-01 XXXX
PERCENT FREQ 0.0 0.0 4 - 1 7 4 - 1 7 0.0 b.0 0.0 0.0 4. 17 8.33 0.0 4 - 1 7
1 2 - 5 0 16 -67 L6.67 29.17
2.OE-01 XXXXXXXXXXXXX 3.OE-01 XXXXXXXXXKXXXXXXX 5.OE-01 XXUXXXXXXXXXXXXXX 7.OE-01 XXXYXXKXXXXXXXXXXXXKXXXXXXXXX
PERCENT FREQ CUM
0.0 0.0 4- 17 8 - 3 3 8.33 0.33 8-33 6 - 3 3
12 -50 :
20.63 20.83 25 OO 31-50 54.17 '
70.83 100.00
HAXlMUM 7.00000E-01 . IINIMUI P 5r00005E-03 GEOMETRIC HEAN = 2-2B922E-01 GEOMETRIC DEVIATION = 3-96350E 00
ANALYT tCAL 6 VALUES 0 24
0.0
A470 GEDCHEHlCAL SUMMARY - U 5 G S STATPAC 104 /12 /711
TITLE ANCHORAGE 8-PIROCK SAHPLES
L I M I T S LOUER - UPPER
803E 0 0 - 1-2E i e 2 E 01 - 1-BE 1 e B E O L - 2-bE 2.6E 0 1 - 3-8E 3.8E 0 1 - 5.6E 5.6E 01 - B . 3 E 8 . 3 E O P - 1-2E 1.ZE 02 - 1*8E I.BE 0 2 - P.bE 2.6E 0 2 - 3.8E 3.8E .02 - 506E 5 . 6 E 0 2 - B03E 8.3E 0 2 - 1a2E 1.2E 0 3 - 1-8E 1 . 8 E 0 3 - 2-bE 2 . 6 E 0 3 - 3-BE
FIEQ FREQ PERCENT cun FWEQ
0.1 0 0 0 - 0 0 1 0 ' 0 0.0 0 1 0 ' 0 0-0 0 1 0 0 0.0 0 1 0 0 0.0 01 0 0 0.0 0 2 0 0 0.0 0 2 0 0 0.0 0 2 I 1 . 4-17 02 2 3 8.33 0 2 0 3 0.0 02 4 7 16 -67 0 3 3 1 0 . 1 2 - 5 0 03 10 20 4 1 - 6 7 03 3 23 1 2 - 5 0 0 3 1 2 4 4-17
PERCENT FREO cum
0-0 0.6 0.0 0.0 0-0 0 - 0 0-0 0.0 4- 17
12-50 12.50 29-17 41 -67 83-33 95-83
100.00
HISTOGRAM FOR COLUMN 5 t U# $PM 1
03 XKXXXXKXXYXXXXXXXXXXXXXXXXXXXXXXKXXKKXXXXX 03 xxxxnxxxnxxxx 03 XKXX
AMA'hYTItAC G VALUES , 0 24
0.0
DATE 4 / 2 3 / 1 1
MAXIMUM 3o000QPE 03 HPNlHUH = 2.OQOOOE 02 GEOMETRlC MEAN = 1.07736E 03 GEOHETRIC D E V I A T I O N = Pe94394E 00
x
iix
Y
KX
X
X
X
x
xx
K
xx
Y
XX
XX
Y
XX
XY
X
YX
XX
X
XX
XY
X
X~
XX
Y Y
YY
%X
*X
%
X
XX
XX
X
x
XX
XX
XX
Y
A470 GEOCHEt4IC&L. SUMMARY - U 5 G S STATPAC (04 /12 /711
T I T L E ANCHORAGE B-ISROCK SANPLES
FREQUENCY TABLE FOR COLUMN 10 t BA PPH I
LIMITS FREQ FREQ LOWER - UPPER c un
1.BE 0 1 - 2-6E 0 1 2 ' 2 2.bE 0 1 - 30BE 01 0 2 3.8E 01 - 5-6E 01 1 3 S o b € O l - 8-3E 0 1 2 5 8 . 3 E 0 1 - 1 0 Z E Q 2 I 6 L . Z E 0 2 - 1 0 B E D 2 4 1 0 L a B E 0 2 - 2 - 6 E 0 2 1 11 2 - b E 0 2 - 3 - 8 E 0 2 4 1 5 3-8E 02 - 5-6E 0 2 L 16 5-6E 02 - B-3E 0 2 2 k8 8 . 3 E 0 2 - P e 2 E 0 3 1 19 1.2E 03 - 1.8E 03 0 1 9 1 . 8 E 0 3 - 2 - Q E Q 3 0 19 2-6E 03 - 3-BE 0 3 1 2 0
HISTOGRhH FOR COLUMN 10 1 BA PPH I
2-DE 01 XXXKXXXX 3.OE 01 5.OE 0 1 XXXX T.OE 01 XXKKXXKX 1-OE 02 XKKX. 1.5E 0 2 #ltXWXXKXXXXXXXXXX 2 . O E 0 2 XXXK 3.OE 0 2 XKXXXXXXXXXXXXXXX 5.OE 0 2 XXKX 7.OE 02 XXKXfXXX 1-OE 03 XXXK k.5E 03 2.OE 0 3 3 . O E 03 XXXX
PERCENT FREQ .
8.33 0.0 4 - 1 7 8.33 4- 17
16-67 4.17
16-61 4-17 8.33 4.17 0.0 0.0 4- 11
PERCENT FREQ CUM
8-33 8 -33 :...
14.50 "
20.63 25-00 . 4 1 - 6 7 49-83 62.50 6 6 - 6 1 75-00 79.17 79.17 79-11 83.33
ltHALYTllQAL G VALUES 0 20
8- 0
DIVE 4123/78
LY .t
0-
Off
N
wry
m
1
94
9
e O
Q
ao+ n
ruru
iz
00
0
00
- D
DII C
0
0
4
'no
r-
. .d
5
T I T L E hNCHORAGE B-?*ROCK SAMPLES
FREQUENCY TABLE FOR CDLUHN 15 1 CR PPR f '
L I M I T S LOWER - UPPER
3.BE00- 5-bE00 S.bE 00 - 803E 00 8.3E 00 - 1.ZE 01 1.2E 01 - 1.8E 01 1.8E 01 - 2-bE 01 206E 01 - 3.8E 81 3-8E 01 - 5-6E OL 5.6E 01 - 8.3E Ot 8.3E 01 - L.2E 02 1.2E 02 - 1.8E 02 l .BE02 - Z.bE02 2 .6E02- 3-BE02 3.8E 02 - S06E 02 5.6E 02 - 8-3E 02 8-3E 02 - 102E 03 102E03 - 1-8E03. 1-BE 03 - , 2.6E 03 2-6E 03 - 3r8E 03
FREO FREQ tun
0 0 0 0
0 0 1 1 3 4 4 a i - 9 4 13 0 13 4 17 0 17 2 r 9 0 19 0 . 19 0 19 0 19 . O 19 2, 21
XXXX XXXXXXXXXXXXX XXXXxXX.~XXXXXXXXX XXXX XXXXXXXXXXXXXXXXX
XXKXXXXXXXXXXXKXX
XXXXXKXK
PERCENT FREQ 0.0 0.0 0.0 4-17 L2.50 16.67 4. 17
15-67 0-0
16-67 0-0 8.33 0.0 0.0 0.0 0.0 0.0 8.33
PERCENT FREO cum
0- p 0.0 0-0 4-17
16.67 33.33 Pl.50 54-17 54-17 10-93 70.83 79-17 79- 17 7 9- 11 79-17 79-17 79. 11 87-50
ANALYTICAL G VALUE5 3 . 21
12.50
naxIwun 3.ooooo~ 03 MINIMUM = 1-50000E 01 GtiOMETRIC MEAN = 8,65230E 01
.GEOMETRIC DEVIATION = 4-40174E 00 . . . . . . . . - . . .
A470 GEOCHEMICAL SUMMARY - U S G S STATPAL IO4/12/711
T I T L E ANCHORAGE 8-7rROCK SAHPLES
FREQUENCY TABLE FOR COLUHN 16 t CU PPM 1
L I M I T S FREQ FREQ PERCENT LOWER - UPPER cum F REQ
3 . B E 0 0 - 5 e b E 0 0 2 2 8 -33 5 . 6 E 0 0 - 8 - 3 E 0 0 0 2 0.0 0.3E 00 - 1.2E 01 0 2 0.0 1.2E 0 1 - 1.8E 0 1 1 3 4.17 1.8E 01 - 2.6E 01 0 3: 0.0 2.bE' 0 1 - 3.0E 0 1 3 12-50 3.8E 01 - 5.6E 0 1 2 B 8-33 5.6E 01 - B.3E 0 1 6 14 . 25.00 8.3E 0 1 - 1.2E 02 1 1 5 4. I 7 1.ZE 02 - 1.8E 02 5 20 20.83 1.8E 02 - 2.6E 02 1 21 4. 17 2 . 6 E 0 2 - 3 .6E02 1 ' 22 40 17
HISTDGRhH FOR COLUMN i 6 4 CU PPH 1
S.OE 00 xxxxxxnx 7,OE 00 1.OE 01 1o5E 01 XXXX 2.OE. 0 1 3,OE 0 1 XXXXXXXXXXXXX 5-OE 0 1 X X K X X X X X 7.0E 01 XXXXXXXXXXXXXXXXXXXXXXXXX 1.OE 02 XXXZ 1.5E 02 XXXXXXXXXXXXXXXXXXXXX . 2.OE 02 XXKK 3.OE 02 XXKX
nAXIMUH .= 3-00000E 02 HINIHUR = S.O~OOOE 00 GEOMETRIC MEAN = 6.00823E 0 1 GEOMETRIC D E V I A T I O N = 2.9399% 00
PERCENT FREQ CUn
8.33 8-33 8.33
12-59 12.50 25.00 33.33 50.33 62.50 83.33 , . 87-50 91-67
INALITIGAL 0 T G VALUES 0 0 0 22
0.0 0.0
A470 GEDCHEMIC4L SUMMARY - U G S STATPAC 1 0 4 / 1 2 / 7 1 1
T I T L E 4NCHORAGE 8-7rROCK SIMPLES '
FREQUENCY TABLE FOR COLUMN 19 ( NB PPW 1
LIMCTS FREQ FREQ PERCENT PERCENT
. . LOUER - UPPER C UH FREQ FREQ CUM 8.3E 00 - 1.2E 01 6 6 25 00 25.00 1.2E 01 - 1.BE 0 1 1 7 0 4-17 29- 17
HISTOGRAM FOR COLUMN 19 1 NB PPH )
HAXIHUH a L.50000E 01 nlNlnun = ~ . o o o o o ~ 01 GEOMETRIC MEAN = 1.05963E OL
6- - GEOMETRIC D E V i A T l O N = 1.16563E. 00
ANALYTICAL T G VALUES 0 0 7
0.0 0.0 '
DATE 4 /23 /71
A470 GEDCHEHIClL SUMMARY - U S G S STATPAC (04 /12 /711 DATE 4 / 2 3 / 7 1
T I T L E ANCHORAGE B-7rROCK SAMPLES
FREQUENCY TABLE FUR COLUMN 2Q i N I PPH )
LIHITS FREQ FREQ LOWER - UPPER CUH
3. BE 0 0 - 5.6E 0 0 0 0 5 . 6 E 0 0 - 8 - 3 E 0 0 0 0 8.3E 00 - 1.2E 01 2 2 1 . 2 E 0 1 - 1 . 8 E 0 1 0 2 1.0E 0 1 - 2.bE 0 1 0 2 2-6E 0 1 - 3.BE 01 7 9 3 - 8 6 0 1 - 5.6E 0 1 2 1 1 5-6E 0 1 - 0.3E 0 1 C 15 8.3E 0 1 - 1.2E 0 2 3 10 1 o Z E 0 2 - 1 - B E 0 2 1 1 9 l . B E 0 2 - 2 . 6 E 0 2 0 19 2,6E 02 - 3.EE 0 2 0 1 9 3 . B E 0 2 - 5 . 6 E 0 2 1 2 0 5 - 6 E O 2 - 8 . 3 E 0 2 1 21 8 . 3 E 0 2 - 1 - 2 E 0 3 1 2 2 l . Z E 0 3 - 1 . 0 E 0 3 0 22 1.0E 0 3 - 2.6E 0 3 1 2 3 2.6E 0 3 - 3.8E 0 3 1 24
PERCENT FREQ
0.0 0.0 8.33 0.0 0.0
2 9 - 1 7 8- 3 3
16.67 1 2 - 5 0 4. 1 7 0.0 0.0 4-17 4 - 1 7 4 - 1 7 0.0 5 - 1 7 4 - 1 7
PERCENT FREQ cum
0.0 0.0 8 - 3 3 8 - 3 3 8.33
3 7 - 2 0 45.83 6 2 - 5 0 7 5 0 0 19 -17 1 9 - 1 1 79.11 83 -33 '
07e50 91.67 91 -67 95.83
loo. 0 0
Q..
P HISTDGRAM FOR COLUHN LO I NI PPM 1
1.OE 01 KXXXXXXX L.5E 01 2,OE 0 1 3mOE 01 X X X K X K K X X X X X X X X X X X X X X X X X X X X X X 5mOE 01 XXXKXXXK 7.OE 0 1 XXXXXXXXXKXXXXXXI 1.OE 02 XXKKXXXXXXXXX 1.5E 0 2 XXXX 2.OE 02 3 o O E 0 2 5.OE 0 2 XXXX 7.OE 0 2 XXXX 1.OE 03 XXXX 1.5E 0 3 2.OE 03 X X X X 3-OE 0 3 XUKX
HAXERUI = 3.08000E 0 3 MINIHUH P.OOOOQE 01 GEOMETRIC M A N = 8.75687E 01 ,
GEOMETRIC OEVIATlON = 4.6407bE 08
ANALYT1,CAL G VALUES 0 24
0. 0
A470 GEOCHEWICAL SUMMARY - U S G S STATPAC 1 0 4 / 1 2 / 7 1 1
T l T L E ANCHORAGE 0 -7rROCK ShPPLES
FREQUENCY TABLE FOR CULUHN 21 ( PB PPM 1
L I H ~ T S FREQ FREO LOWER - UPPER C UH
8 . 3 E 0 0 ' - 1.2E 01 2 2 1 . 2 ~ 01 - 1 . 8 ~ 01 2 4 1.BE 01 - 2.6E OL 1 5 2.6E 01 - 3-8E 01 0 5 3 . 8 E 01 - 5.6E OL 0 5 5.6E 01 - 8-3E 01 0 5 8.3E 0 1 - 1-2E 0 2 1 B
HISTOGRAH FDR COLUMN 21 1 PB PPM I
1.OE 01 XXXXXXXX 1.5E 01 XXXXXXXX 2.OE 01 XXXX 3.OE 01 5.OE OL 7.OE 01 L.OE 02 XKXX
PERCENT FREQ
8 - 3 3 8.33 4.17 0.0 0.0 0.0 4 .17
PERCENT FREQ CUM
8-33 . 16-67 20.8 3 20-83 20.83 2 0 . 8 3 25-00
ANALYTICAL G VALUES 0 6
0.0 .
M A X I M U M = 1.00000E 0 2 MINIHUH 1 . 0 0 0 0 0 E 01 GEOMETRIC MEAN = 1 . 8 8 5 9 7 E 01 GEOMETRIC D E V I A T i O N = 2.36263E 00
A470 GEOCHEHlCAL SOHHARY - U S G S STATPAC (0%/12/71)
T I T L E PNCHUIAGE 8-7rROCK SAMPLES
FREQUENCY TABLE FOR CIlLUMM 2 3 1 SC PPH 1
L I M I T S FREQ FREO PERCENT LOWER - UPPER CUM FREO
3 o B E 0 0 - § . L E O 0 0 0 0.0 5 o b E 0 0 - 8 - 3 E 0 0 2 2 8 - 3 3 8.3E 00 - L.2E 01 2 4 80 33 1 0 Z E OL - '1.8E 01 3 7 12.50 1.8E 01 - 2-6E 01 3 10 12.50 2.6f Oi - 3.SE 01 3 13 12-50 3-BE 01 - 5-6E 0 1 5 1 8 20.83 5.6E 01 - 3.3E 01 2 2 0 8-33 B a 3 E 0 1 - 1 . 2 E 0 2 1 2 1 40 l f
HISTPGRAH FOR COLUHN 2 3 I SC PPH 1
7-OE 00 XXXXXXXX 1.0E 01 XXXXKXXX 1.5E 01 XXXXXXXXXXXXX 2.0E 01 XXXXKXKXXXXXX 3.OE 01 XXXXXXXXXXXXX ' '
5.OE 01 XXXXXXXXXXXXXXXXXXXXX ?.OE 01 XXXXXXXX 1.OE 0 2 XXXX
PERCEMt FREQ CUH
0.0 8 - 3 9
16-67 2 9 - 1 7 41-61 54- 17 75.00 83- 3 3 87.50
ANALYTICAL B T G VALUES 0 0 0 ' 21
0.0 0.0
DATE 4/23/?L
wxInun = l.ooooo~ 02 MINIRUM 5 7.00000E 00 GEOHETRIC MEAN 2 r b 0 6 6 8 E 01 GEOMETRIC DEVIATPON = 2 - 1 9 4 9 0 E 00
A470 GEOCHEMICAL SUMHARY - U S G 5 STATPAC 1 0 4 / 1 2 / 7 1 )
T I T L E hi4CHORAGE B-7sROCK SAMPLES '
FREQUENCY TABLE FUR COLUMN 2 5 ( SR PPM I
L I M I T S FREQ FREQ PERCENT PERCENT LOWER - UPPER c un FREQ FREQ CUM
8.3E 01 - I - Z E 02 1 1 4-17 4. 17 1 . 2 E 0 2 - l . B E 0 2 Q 5 1 6 . 6 7 2 0 . 8 3 1 .8E 02 - 2 . 6 E 0 2 5 10 20 . 83 41.67 2 .6E 02 - 3.8E 02 5 15 20.83 6 2 . 5 0 3.8E 02 - 5.6E 0 2 4 19 16.67 79.17
HISTOGRAM FOR COLUMN 2 5 ( SR PPW ?
1.0E 02 XKXX 1.5E 02 KUXXIXXXXXXXXXKXX 2.OE 02 XXXXXXXKXXXXXXXXXXXXK 3.OE 02 XXXXXXXXXXXKXXXXXXXXX 5.OE ' 0 2 XXXXXXKKXXXXXXXXX
DATE 4 / 2 3 / 7 1
MhXlHUM = 5 , 0 0 0 0 0 E 0 2 M I N I M U M = 1 o 0 0 0 0 0 E 0 2 GEOMETRlC MEAN = 2 . 4 4 9 0 3 E 02 GEOMETRIC D E V I A ~ I O N = 1 . 6 2 2 2 9 E .00 '
21 x
xx
xx
9
X
XY
XX
X
h
x
XY
XP
X
Y
X*
%iiY
4
dd
dd
MN
NN
NN
N
X
XX
XX
X
OO
dO
OO
OO
OO
OO
Y
Y
XY
XX
X
X
XX
XX
W
WW
UJ
UJ
WW
LU
YW
WL
U
z
Y
XY
XY
Y
NP
~W
G~
NQ
*~
~~
r
~x
xx
~~
xx
x
dL r
ro
**
ro
#*
**
r
9
XX
XX
XX
%X
X
UI
~~
NA
KS
~~
~N
~W
Q
A
wx
xx
wx
xx
x
P
0
xx
xx
xx
xx
x
Lnll
U
-I
Clu
.r a
C
4
er P U
a
d
~u
r~
Ww
Wu
ll
uw
ww
wL
u
A~
N~
Q~
Q~
N~
Q~
Q
.. I.
..
..
..
..
A470 GEOCHEHICAL SUMMARY - U S G 5 S T A ~ P A C t O 4 / 1 2 / 7 1 )
TITLE ANCHORAGE 0-79 ROCK SAMPLES
FKEQUENCY TABLE FOR COLUMN 28 'l Y PPM 1
L I M I T S FREQ FREQ PERCENT PERCENT LOWER - UPPER c un FREQ FREQ tun
B.3E 00 - 1.2E 01 3 3 1 2 . 5 0 12.50 1.2E 01 - 1.8E 01 7 10 2 9 . 1 7 4 1 . 6 1 1-8E O t - 2.6E 01 4 1 4 . 16.67 58.33 2 .6E 01 - 3.8E 01 2 16 8 - 3 3 66.67
1.OE 01 XXXXKXXXXXXXX 1.5E 01 X X X X X X X X X X K X X X X X X X X X X X X X W X X X K 2.OE 01 XXXXXXKKXXXKXXXXf . 3 - O E 01 XKXXXXXX
wxlwun = 3 .ooooo~ 01 nrNrnun = 1.ooooo~ 01 GEOMETRIC MEAN 1-b2905E 01 GEOMETRIC O E V I A T I O N = 1 . 3 9 6 9 % 00
ANALYTICAL G YAlUES 0 16
0 - 0
DATE 4 / 2 3 / 7 1
A470 GEOCHEMICAL SUMNARY - ll S G S STATPBC ( 0 4 / 1 2 / 7 1 i
T I T L E ANCHORAGE B-7rRDCK SARPLES
L I ~ I T S FREQ 'FREP LOWER - UPPER CUM
8w3E 0 0 - 1-2E OP 0 0 1.2E 01 - l o B E 01 0 0 198E 01 - 2.6E 01 1 1 2.6E 0 1 - 3.BE 01 2 3 3.8f 01 - 5.-E 01 2 5 5.6f 01 - 893E 01 5 10 8.3E 01 - 1.2E 0 2 3 13 L.2E 02 - 1.8E 0 2 . 2 IS 1 . B E 0 2 - 2 1 b E 0 2 2 1 7
HISTOGRAM FOR COLUHN 3 0 1 ZR PPM 1
2.OE 01 XXXX 3.OE 01 X X X X X I X X 5.OE 01 XXXXXXXX 7.OE Of XXXKXXXXXXXXXXXXXXXXX I. OE 02 X X X X X X I X X X X X X 1 . 5 ~ 02 xrxxxxxx ZIOE 0 2 X X X X X X X I
nrrxrnura = 2 , o o o o o ~ 02 MlNIRUM a 2~00000E 01
. GEOMETRIC HEAH = 7.45629E 01 GEOMETRIC DEVIATION = 1.92948E 00
PERCENT FREQ cun
0.0 0.0 4-17
12.50 2 0 - 8 3 41-67 54.17 62.50 70.13
DATE 4 / 2 9 / 7 1
A 4 7 0 GEOCHEMICAL SURMARY - U S G 5 SIATPAC t 0 4 / 1 2 / 7 1 1 DATE 4 / 2 3 / 7 1
T I T L E ANCHORAGE 8-7.ROCK SAMPLES
I N THE COMPUTATIONS PEIFURHEO T d PRODUCE THE FOLLOWlWG TABLE OF G E O ~ E T R I C WEANS AND DEVIATIONS. & L L ELEMENTS ARE IGNORED YNERE ONE OR MORE OF THE UNQUALIFIED DATA VALUES 1s LESS THkH THE AMALYf ICAL L I M I T OF DETECTION S P E C I F l E D ON INPUT OR UHERE ANY DhTA VALUES ARE Q U A L I F I E D WITH THE G (GREAfER THAWl CODE* DATA VALUES P U A L I F I E O Y t T H B OR H ARE NOT USED IN THE COWPUTATIONS. WHERE NONE OF THE DATA VhLUES FOR AN ELEMENT ARE Q U A L l F I E O THE MEAN AN0 O E V l h T I O N SHOULD B E THE SAME AS THOSE GIVEN IN THE PRECEDING SECTION. WHERE D A t A ARE Q U A L I F I E D WITH THE CODES NI Lr OR TI THE ESTIMATES OF GEOMElRlG HEAN AN0 DEVIATION ARE BASED ON A METHO0 BY A. J. COHEN FOR TREATING CEI~SORED DISTRIBUTIONS. THE A P P L I C A T I O N OF T H I S METHOD TO GEOCHERICAL PROBLEMS I S DESCRIBED IN USGS PROFESSIONAL PaPEa 574-8. THE ESTIMATES ARE UNBIASED IN A STRICT SENSE ONLY WHERE THE DATA ARE DERIVED FROM A LOGNORHAL PARENr POPULbTIOM. BUT EXPERIHENTS HAVE SHOWN THAT LARGE DEPARTURES FROM T H I S REOUIREWENr MAY NOT GREATLY INVALIOATE THE RESULTS ACCEPTAfiCE AND USE O f THE ESTlHATESq HOYEVERs I S THE R E S P O N S I B I L l f Y DF THE INDIV IDUAL.
ANLCYTICRL ELEMENT H L H 8 r 6 VALUES
FE PCT hG P C 1 LA P C 1 T I P C 1 MN PPM
0 PPM BA PPM BE PPH CO PPH CR PPM C U PPt4 NB PPH N I P P I PB PPH St PPH SR PPM
V PPM Y PPH
ZR PPM
ELEMENT F E PCT HG PCT C A PCT T I PCT HN PPH
B PPM BA PPM BE PPH CO PPM CR PPW CU PPM 30 PPM N I PPM PB PPH SC PPH SR PPM
GEOMETRIC GEOMETRIC MEAN D E V I A T I O N
7.217159 1.78 *****I** ***a*+
1.975247 4.76 0.228922 3.96
1077.3583?8 1.94 19.706329 2.42 112.829819 5 - 4 6
0.487588 1-70 36.222504 2.90 *++***** *+**+* 45.613678 4.00
6.798606 1.44 87.568527 4.64
++****a*- ****+* 19,286692 2-96
179,875092 2.13
REMARKS 2 4 SAMPLES AND 24 A N A L Y r I C A L VALUES.
5 GREATER THAN VALUES. MO COCtPUTATIEmS. 1 NOT OETECTEO* LESS THANt OR TRACE VALUES* 23 REPORTEO VALUES.
2 4 SAMPLES AND i4 ANALYTICAL VALUES. 2 4 SAMPLES AND 24 AYALYTICAL VAL3ES.
3 NOT DETECTED* LESS THANr OR TRACE VALUES. 2 1 REPORTEO VALUES. 4 NOT DETECTED9 LESS THAW* OR TRACE VALUES. 20 REPORTED VALUES.
2 0 MOT DETECTED9 L E S S T H A N i OR TRACE VALUES* 4 REPORTED VALUES. 24 SAMPLES AND 24 ANALYTICAL VALUES-
3 GREATER THAN VALUES. NO COMPUTATIONS. 2 NOT DETEC~EOI LESS THANI OR TRACE VALUES. 2 2 REPORTEO VALUES. I7 NOT DETECTEOI LESS THAN* OR TRACE VALUES. 7 REPORTEO VALUES- 2 4 SAHPLES AND 2 4 ANALYTICAL VALUES.
COHEN'S TABLE EXCEEDED. H ( 0.81 OR GAMWdf 1-18 688 THAN AkLOUo NO COHPUTBTIONS- 3 NOT DETECTED* LESS THAN."OR TRACE VALUES. 2 1 REPORTED WALUES. 5 NOT DEIECIEDI LESS THAN* OR TRACE VALUES. 19 REPORTED VALUES.
V PPR 185.218399 2-68 Y PPI 11-471986 1 -a1
ZR P P ~ 30.464417 4-71
24 SAMPLES AND 24 ANILr r ICAL VALUES. 8 HOT DETECTEDI LESS THANI OR TRACE VALUES. 16 REPORTED VALUES. 9 NOT DETECTED* LESS THAN. OR TRACE VhLUES. i l REPORTED VALUES.
