Deep Sea Drilling Project Initial Reports Volume 81 · PLATEAU, DEEP SEA DRILLING PROJECT LEG 811 K. Krumsiek, Geologisches Institut, Bonn and ... A/m to 6 × 10 ~5 A/m, and satisfactory

35. PALEOMAGNETICS OF TERTIARY SEDIMENTS FROM THE SOUTHWEST ROCKALLPLATEAU, DEEP SEA DRILLING PROJECT LEG 811

K. Krumsiek, Geologisches Institut, Bonnand

D. G. Roberts, Institute of Oceanographic Sciences, Wormley

ABSTRACT

Paleomagnetic data are tabulated for DSDP Sites 552, 553, 554, and 555, drilled on the southwest margin of Rock-all Plateau. No interpretation of these data has been given; because the results provide a particularly valuable record ofPaleogene and Neogene magnetostratigraphy they have, however, been provided here for use by the community.

INTRODUCTION

This chapter presents data from the shipboard andpost-cruise paleomagnetic studies of sediments and ba-salts cored on the southwest margin of Rockall Plateauduring Leg 81 of the International Phase of OceanDrilling of the Deep Sea Drilling Project (DSDP). (SeeTable 1, at end of chapter, and Figs. 1-3.)

The study was intended to extend the results earlierobtained during Leg 48 by Hailwood (1979). It wasthought that the paleomagnetic study would provide auseful source of information with which to constrainboth the age and eruption history of the lavas thoughtlargely to compose the suite of dipping reflectors. It wasalso thought that, by providing a more exact chronol-ogy, the identification of magnetic polarity reversals mighthelp in understanding the closely spaced events that pre-ceded and heralded the breakup of Greenland and Rock-all. Finally, it was hoped that detailed paleomagneticstudies of the late Neogene and Quaternary would con-tribute to studies of the evolution of North Atlantic pa-leoceanography and climate (Zimmerman, this volume;Backman, this volume). Unfortunately, time constraints,and changing circumstances in German universities since1981 which were beyond the control of the senior au-thor (the shipboard paleomagnetist), did not allow prep-aration of a written report. As the observations are ofpotentially great value, however, they have been tabu-lated for future reference, pending a subsequent fullreport.

PALEOMAGNETIC TECHNIQUESPaleomagnetic measurements on Leg 81 were carried

out with the equipment installed on Glomar Challeng-er—a "Digico" computerized spinner magnetometerfor measurement of discrete samples having volumes in

Roberts, D. G., Schnitker, D., et al., Init. Repts. DSDP, 81: Washington (U.S. Govt.Printing Office).

^ Addresses: (Krumsiek) Geologisches Institut, Friedrick-Wilhelms-Universitàt, Bonn,Nussallee 8, D53OO Bonn 1, Federal Republic of Germany; (Roberts) Institute of Oceano-graphic Sciences, Wormley, Godalming, Surrey, United Kingdom (present address: British Pe-troleum Co. Ltd., Britannic House, Moor Lane, London EC2Y 9BU, United Kingdom).

the range of 10 to 20 cm3, and a Schonstedt AF de-magnetizer enclosed in a mu-metal shield. A variablespeed, reversible, motor-driven system allowed automaticincrease of the demagnetizing field to a predeterminedpeak value, and smooth down to zero. The noise level ofthe magnetometer was usually in the range of 2 × 10 ~4

A/m to 6 × 10 ~5 A/m, and satisfactory repeatability ofmeasurements was possible for most samples using anintegration time corresponding to 23 to 25 revolutions.

Additional shipboard measurements were made onHPC cores using the long core spinner. In the case ofmany samples, further post-cruise studies were carriedout in the paleomagnetic laboratories at Bonn and atZurich to confirm and extend the initial measurementsmade at sea. At Bonn University the specimens weremeasured with an UGF 4 spinner magnetometer pro-duced by Geofisika, Brno (CSSR). The sample rotatesat 88 revolutions per second; the integration time is 1 or10 seconds. Demagnetization experiments were carriedout with the motor-driven system described above butalso incorporating a two-axis tumbling system. Duringdemagnetization, the Earth's magnetic field was com-pensated down to values 50 nT using Helmholtz coils1.4 m in diameter. The magnetic behavior of the RMvector was plotted automatically by means of demag-netization curves (Ir/Io) and Zijderveld diagrams. Thepaleomagnetic work at Bonn University was limited bythe resolution of the spinner magnetometer (2 × 10 ~5

A/m) and by the inconsistency of the specimen.Post-cruise studies were continued at Zurich Univer-

sity, using a two-axis cryogenic magnetometer for themeasurements. The demagnetization experiments werecarried out with a Schonstedt AF demagnetizer as hasbeen described. The results were plotted by means ofIr/Io-curves only.

Although the shipboard instruments, the spinner mag-netometer, and the AF demagnetizer at Bonn Universityare still calibrated in the cgs measurement system, theSI metric system is established at Zurich. Since the SIsystem should be used in all future paleomagnetic work,all data presented here have been converted to thissystem.

837

K. KRUMSIEK, D. G. ROBERTS

Table 1. Compilation of paleomagnetic results, Leg 81.

Sample(interval in cm) Decl. Incl.

Intensity(A/m)

AFD( × I O ~ 1 mT) Decl. Incl.

Intensity(A/m) (×4x SI units)

Hole 552

1-1 73-751-1, 142-1441-2, 85-871-2, 131-1331-3, 11-132-1, 30-322-1, 80-822-1, 100-1023-1, 75-773-2, 75-773-3, 54-563-4, 75_773-5, 130-1323-6, 75-774-1, 136-1384-3, 75-774-4, 68-705-1, 80-825-3, 109-1115-4, 20-225-5, 20-226-1, 19-216-2, 19-216-3, 19-216-4, 19-217-1, 109-1117-2, 123-1257-3, 140-1427-4, 78-808-1, 100-1028-3, 100-1028-4, 19-218-4, 71-739-1, 70-729-2, 70-729-3, 70-729-4, 70-729-5, 70-7212-1, 60-6212-1, 60-6212-3, 60-6212-4, 60-6212-5, 60-6212-6, 60-6212-7, 48-5013-1, 119-12114-1, 94-9614-2, 27-2914-3, 140-14214-2, 15-1716-1, 74-7617-18-18-.21-21-21-21-21-

, 29-31, 58-60

>, 19-21, 77-79, 86-88, 117-119, 134-136, 142-144

21-2, 5-721-2, 15-1721-2, 36-3821-2, 65-6721-2, 85-8721-2, 104-10621-2, 110-11221-2, 129-13121-3, 5-721-3, 25-2721-3, 78-8022-1, 59-6122-2, 66-6823-2, 6-8

208131280199313.334.8

230217173.8196.215.0

207273.1352.390.0

234.0132.0261.0112.8174.32041941351413251071882133.7

182.5195.0207.0204.0113.7295.4274.1

1.6193.8100.1104.4106.8239.4340.270.9

285.5213.9336.322.5

281.565.0

150.7334.3267176.8219

38.3227.9217.9160.3326.7264.1

4.6261183.934.145.2

202.8223.5277316341.482.1

336.7

- 2 16

54584.1

-41 .867.538.127.9

5.0-54 .0-21 .1

5.5-32 .2

33.43.9

18.0- 8 . 3

-15 .023.019

- 2 0- 2 2- 5 5

19144121

-46 .9-14 .6

23.037.031.0

-66 .9-29 .5-49 .6-64 .4-42 .8-44.7-63 .7-14 .8-45 .0-61 .4-45 .5

36.069.471.071.674.361.4

-56 .949.6

- 4 8-44 .8- 3 8-77 .2-45 .6-73 .3

- 3 . 9-66 .3

10.555.1

-63 .8-79 .6-78 .3

50.4-63 .9-67 .9- 6 1- 6 7-55 .5-68 .7-55 .9

3.261.828.807.724.761.53.79.01.33.08.03.01.07.02.49.03.63.62.22.72.331.521.051.461.299.128.461.071.01.31.31.34.947.659.364.492.497.071.061.155.149.099.751.391.072.913.502.186.612.915.029.097.61.867.25.011.151.871.442.345.832.454.854.845.401.228.004.616.66.96.66

10.36.79

×××X

×××××××××××××××××××××××××××XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

- 3- 3- 3- 3- 4- 5- 5- 6- 5- 6- 6- 6- 5- 6- 5- 6- 5- 5- 5- 5- 5— 4- 3- 4- 4- 5- 4- 3- 5- 5- 5- 5- 2- 3- 4- 3- 3- 3- 3- 2- 3- 3- 3- 3- 2- 3- 3_ 2

- 3- 3- 3- 4- 3- 2- 3- 3- 2- 2- 2- 2- 3- 3- 2- 2- 2- 2- 2- 2- 2- 1

480640320

95304157

735070

2.752.99

××

- 3- 3

480

400500

320720500400640700500400200320320320400320480

50240240320150240320

480480400400

57

162243

51-70

1.89 × 10-5

7.46 × 105.5 × 10

-5-4

30823

23934516915625218917716916210932

146173

1014

3068

27325165

239181173343

4743585063

- 5 4- 4 6- 3 6- 5 0- 1 9- 5 3- 3 7- 6 0

- 3- 6 5

42- 6 1- 6 6- 4 3- 3 0- 5 5- 6 3

- 6 6- 6 4- 5 2- 5 0

2.52.71.52.52.91.91.86.81.21.57.01.21.32.44.2

1.28.76.72.86.76.02.6

1.63.73.53.3

××××××××X

×××××X

X

×XXXXX

X

××X

-3-3-3-3-3-3-5-3-2-3-4-3-3-3-3

-4-3-3-3-4-3-3

-2-1-1-1

838

Table 1. (Continued).

PALEOMAGNETICS OF TERTIARY SEDIMENTS


Intensity(A/m)

AFDmT) Decl. Incl.


Hole 552A

1-1, 47-491-1, 80-821-2, 93-953-1, 115-1173-2, 115-1173-3, 135-1374-1, 117-1194-2, 115-1174-3, 113-1155-1, 53-555-2, 53-555-3, 14-165-4, 14-167-1, 145-1477-2, 105-1077-3, 102-1048-1, 142-1448-2, 141-1438-3, 108-1109-1, 136-1389-2, 106-1089-3, 136-13810-1, 125-12710-2, 24-2610-3, 114-11611-2, 104-10611-4, 6-812-2, 104-10612-3, 93-9514-1, 113-11514-3, 113-11515-1, 113-11515-2, 113-11515-3, 113-11516-1, 117-11916-2, 117-11916-3, 106-10817-1, 106-10818-2, 63-6518-3, 63-6519-1, 107-10919-2, 107-10919-3, 107-10920-1, 63-6520-2, 63-6521-1, 130-13221-2, 130-13221-3, 49-5122-1, 130-13222-2, 130-13222-3, 49-5123-1, 89-9123-2, 89-9123-3, 89-9124-1, 89-9124-2, 89-9124-2, 106-10824-3, 89-9125-1, 88-9025-2, 29-3125-3, 110-11226-1, 19-2126-1, 39-4126-1, 59-6126-1, 79-8126-1, 99-10126-1, 119-12126-1, 139-14126-2, 19-2126-2, 39-4126-2, 59-6126-2, 79-8126-2, 119-12126-2, 139-14126-3, 19-21

29127316552542533423162493227288266202247021318027223724819526817057165297112186270220137357317330115297731812371892001619769542361841171631117126129730308263901718931812616123133824878803139913333766676

671858686557292117617250-671

-8073

-84-35-38-61-57-10-45-1524191558

-53-8714

-28-1011

-15-18-962

-4139

-49-61-42-7342-5-50-14-16-26-39-50-2-6618

-53-53-55-3914

-3710

-63-50-19-114-215

-2567

-681814-1

1.831.871.771.284.132.508.917.329.012.454.338.359.532.791.391.441.425.81.173.144.195.395.54.557.29.451.301.481.705.903.001.051.501.653.631.403.211.031.601.578.001.002.752.961.631.391.202.451.825.002.178.273.421.374.131.102.201.754.044.255.615.919.651.629.009.007.76.61.41.606.003.152.41.21.1

××××X

×X

X

X

×X

X

×X

×X

×X

X

×X

X

X

X

×X

×X

×X

X

×××X

X

X

X

X

X

XX

X

X

X

X

X

XX

X

×X

XX

X

X

X

×X

X

X

X

X

X

X

XX

X

X

X

XX

XX

X

- 2- 2- 2- 2- 2- 2- 2- 3- 3- 2- 3- 3- 4- 2- 4- 2- 2- 4- 2- 2- 3- 4- 5- 3- 4- 4- 3- 3- 4- 4- 5- 4- 5- 4- 5- 4- 4- 4- 4- 4- 5- 4- 5- 3- 4- 2- 4- 5- 4- 5- 5- 5- 5- 5- 5- 4- 5- 5- 5- 5- 5- 3- 5- 4- 5- 5- 4- 4- 4- 4_ 5

- 5- 4- 4- 4

700700

500700400

350281

40246312

2055

56-3-26

6.622.86

8.241.621.48

××××X

1010

101010

- 2- 3

- 3- 3- 3

80 254 30 1.39 × 10 - 5

160

240

320120

320

400

211

323

29762

54 7.15 × 10 - 6

- 644 8.10 × 10

60 7.64 × 10~°37 8.08 × 1 0 ~ 6

169 60 1.08 × 10

317 - 5 9 2.7 × 10

- 5

- 5

240 319 - 7 3 2.67 × 10 - 5

839




Intensity(A/m)

AFD(×IO~1 mT) Decl. Incl.

Intensity(A/m) (× 4x SI units)

Hole 552A (Cont.)

26-3, 39-4126-3, 59-6126-3, 79-8126-3, 99-10126-3, 119-12126-3, 140-14227-27-27-27-27-27-

I, 19-21, 39-41,58-60I, 79-81, 101-103, 139-141

27-2, 19-2127-2, 39-4127-2, 59-6127-2, 79-8127-2, 99-10127-2, 119-12127-2, 139-14127-3, 19-2127-3, 40-4227-3, 59-6127-3, 79-8127-3, 99-10127-3, 119-12127-3, 141-14327-4, 11-1328-1, 19-2128-1, 69-7128-1, 89-9128-1, 112-11428-1, 136-13828-2, 11-1328-2, 30-3228-2, 49-5128-2, 69-7128-2, 89-9128-2, 112-11428-2, 135-13728-3, 12-1428-3, 30-3228-3, 49-5128-3, 69-7128-3, 112-11428-3, 125-12728-3, 146-14828-4, 11-1328-4, 32-3429-1, 142-14429-2, 142-14429-3, 142-14430-1, 117-11930-2, 117-11930-3, 117-11931-1, 81-8331-2, 49-5131-3, 48-5032-1, 73-7532-2, 73-7532-3, 73-7533-1, 137-13933-2, 137-13933-3, 137-13934-1, 110-11234-2, 110-11235-1, 130-13235-2, 130-13235-3, 130-13236-1, 35-3736-2, 35-3736-3, 35-3736-3, 135-13737-2, 56-5737-2, 73-74370, 118-119

3514965914685752562422446199923292807514611779

21432411353

341763136729209307431713373418

2372411481646516922818616313205509014615017428621127416015916317681911101323321741431693213125121417092

31-6921

-11-20-36-72-7-25-182839

-71124860237071791546594843

5913

-683854

-407373696360448168

-12-51-82-54-58-3-45-7925

-158817

-55-32-58-39-68-76-162671534912

-6013286144

-57-57-167367-8

2.03.558.006.004.001.101.009.001.003.005.004.004.92.25.928.003.002.701.005.003.007.579.003.005.00

6.001.005.841.401.106.505.001.007.387.009.001.802.103.471.008.001.291.101.403.507.009.502.214.306.774.003.009.006.005.495.261.743.863.655.691.469.586.611.292.611.262.006.661.831.261.901.312.534.77

××××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

XX

X

×X

X

XX

X

X

X

X

X

×X

X

X

×X

X

×X

X

X

X

X

X

X

X

X

×X

X

io :10-510-510-510-5

iorIO-*10-5io-4io-10-510-510-410-410-510-510-510-410-410-510-510-510-510-510-5

10-510-410-310-410-410-410-510-410-510-51 0 ~ A10 A10-4

10-410-510-410-410 A10-410-510-510~l10-410-510-510-510-510-510-510-510-310-410 A10-410-310-510-510-410-510-310-310-5IO-?10-210-4io-2

10-2to"3

120

320

320

160

160320

320640

320

288

234

238

78

102155

186358

338

73

67

-50

79

1381

46-43

-66

2.15 ×

1.66 ×

6.15 ×

4.28 ×

2.27 ×1.73 ×

2.11 ×1.47 ×

1.88 ×

10 - 5

10 - 5

10 - 6

10 - 5

- 5- 4

- 5- 3

10 - 3

840



Sample(interval in cm)

Hole 552A (Cont.)

37-3, 26-2837-3, 56-5737-3, 73-7537-3, 118-11938-1, 135-13738-2, 135-13738-3, 135-137

Hole 553A

4-2, 53-554-3, 85-874-4, 53-554-5, 53-554-6, 53-554-7, 30-325-1, 91-935-2, 91-935-3, 91-935-4, 91-935-5, 91-935-6, 91-936-1, 20-226-3, 20-226-4, 20-226-5, 15-176-6, 15-177-1, 120-1227-5, 37-397-5, 119-1218-1, 113-1158-2, 19-218-3, 113-1158-3, 136-1389-1, 89-919-2, 88-919-3, 90-929-4, 21-239-5, 55-579-5, 136-1389-6, 15-179-6, 57-5910-1, 118-11910-2, 29-3110-3, 88-9010-4, 16-1810-5, 10-1210-6, 62-6410-7, 42-4411-1, 19-2111-2,26-2811-3,77-7911-4, 26-2811-5, 45-4711-6, 3-511-6, 58-6012-1, 44-4612-2, 25-2712-3, 19-2112-4, 19-2113-1, 23-2513-2, 99-10114-1, 12-1414-1, 52-5414-2, 107-10914-4, 46-4814-5, 33-3514-7, 30-3215-1, 47-4915-2, 109-11115-3, 142-14415-4, 63-6518-1, 104-10618-2, 37-4019-1, 54-56

Decl.

35134431732864

267169

119627

1128

219243

87347152161176204143168229261119151132225252163.334

245.8200322101.1346285.8138106140.528

103.8354175166.1

3.8229.055.5

253.6268.2310.0217.5276.8239.6

7136.7

103.526.9

180.1224.9275156.772.7

201.889.3

114.7286.567.9

186.9105.5343.333.0

Incl.

- 4 2- 6 0- 7 3- 2 0- 7 5- 6 2- 5 7

- 1 113136975

- 4 0- 9- 1

- 6 4185

- 6 85875623718

- 4 7- 6

- 4 74

1377.110

-41.2- 4 5- 7 3

52.95671.3

- 4 8- 4 0

76.85762.2696876.2

-34.4-13.0-57.0

57.564.467.0

-26.163.062.95171.370.969.158.862.8

- 4 512.4

-70.4-25.2-50.8-62.8-36.8

67.870.9

-6 .019.0

- 5 5

Intensity(A/m)

4.18 × 1 0 " 2

2.11 × 10~ 2

1.91 × 10"2

8.44 × 10"2

2.86 × 10";1.88 × 10~;2.04 × 10" 2

3.5 × lO~4

2.6 × 10"4

9.1 × 10"4

1.9 × 10~4

1.9 × 10~4

3.2 × 10"4

2.6 × 10"4

7.0 × 10"4

5.6 × 10~4

4.8 × 10"4

3.3 × 10"4

5.8 × 10~4

1.11 1

8.7 × 10"4

6.0 × 10"4

9.6 × 10" 3

1.3 × 10"3

3.5 × lO~4

8.5 × lO~4

3.25 × 10 ~ 4

1.2 × 10"3

4.90 × lO~4

9.3 × 10"4

4.63 × 10"4

1.9 × lO~l1.1 × 10"3

4.22 × 10~"4

5.4 × 10"3

4.08 × 10 ~ 3

9.8 × 10"3

5.8 × lO~3

1.42 × 10~3

9.3 × lO~l3.01 × lO~2

2.0 × 10"2

5.1 × io" 3

1.37 × lO~2

9.04 × 10" 3

1.2 × IO"3

2.94 × 10 ~ 2

1.01 × 10~2

2.03 × 10" 2

3.0 × lO~2

2.39 × 10 ~ 2

2.18 × 10~2

1.4 × lO"*4.80 × 10~2

2.70 X 1 0 " ;6.84 × 10" 2

1.51 × 10" 2

3.15 × 10~2

4.0 × 10~2

4.30 × 10" 3

2.93 × 10" 4

2.62 × 10 ~ 4

1.25 × 10~2

1.00 × 10~2

1.95 × 10~2

1.84 × 10" 2

8.17 × 10~2

5.75 × lO~~2

1.45 × 10~2

1.24 × 10" 2

AFD(×IO~1 mT)

480

240320420

640

320

200600

320

320

320240

320

480

320320

320

320240

160

160

160240480

480160

240

160

Decl.

29

205147256

54

193

219277

77

311

11081

29

172

180353

80

65114

97

124

71147331

83146

199

309

Incl.

75

325564

69

- 2 1

- 4 2- 1 4

- 2 9

49

- 5 6- 4 9

70

- 4 3

- 6 5- 4 5

37

- 5 733

49

19

- 2 2- 4 2- 6 8

1730

- 1 2

- 6 5

Intensity(A/m)

4.25

7.11.22.5

2.36

7.7

2.67.2

9.6

2.0

2.75.7

2.3

1.7

1.047.1

1.4

6.0

4.8

1.2

5.03.51.6

8.93.5

1.9

8.4

X

×××

×

×

XX

×

X

×X

×

×

×X

×

×

×

×

X

×X

XX

×

×

10"4

lO"4

10"4

10"4

10~4

lO~ 5

lO~4

10~4

10~4

10~4

i o - 3

10~3

10~3

10"3

io-3

10"3

10~3

10"3

10"2

10"2

io"3

10"2

10"2

10"2

10"3

X(×4x SI units)

0.362.0

0.41

0.71.951.92.92.22.12.54.46.52.03.24.96.2

14.82.64.60.04.17.05.6

12.411.810.57.6

10.5

7.98.87.42.01.67.3

16.613.09.9

12.74.8

841




Intensity(A/m)

AFD( x l O ~ 1 mT) Decl. Incl.


Hole 553A (Cont.)

19-2, 38-4019-3, 101-10319-4, 64-6620-1, 39-4120-2, 40-4220-3, 42-4420-4, 43-4420-5, 45-4720-6, 22-2421-1, 102-10421-2, 100-10221-3, 54-5621-4, 99-10121-5, 13-1522-1, 108-11022-2, 95-9722-3, 44-4622-4, 101-10322-5, 57-5923-1, 19-2123-2, 19-2123-3, 19-2123-4, 12-1423-5, 13-1524-1, 14-1624-2, 63-6525-1, 72-7425-2, 78-8026-2, 71-7327-1, 105-10727-2, 10-1227-3, 11-1327-4, 13-1527-5, 31-3327-6, 40-4234-1, 11-1335-1, 70-7235-1, 70-8136-1, 46-4836-1, 93-9536-2, 21-2336-3, 13-1537-1, 25-2737-2, 89-9137-3, 31-3337-4, 138-14038-1, 24-2638-2, 36-3839-1, 90-9240-1, 95-9740-2, 19-2140-3, 124-12641-2, 30-3241-2, 128-13042-1, 112-11442-2, 37-3943-1, 80-8243-2, 52-5443-3, 35-3746-4, 29-3146-5, 79-8146-6, 5-747-1, 58-6047-2, 132-13447-3, 80-8247-4, 66-6848-1, 22-2448-2, 8-1048-3, 119-12148-4, 29-3148-5, 79-8148-6, 110-11249-1, 10-1249-2, 10-1249-3, 10-12

76.2221.8118.3320.4310.7193.6253.3270.4273.8321.063.0

104.4122.551.615.1

256.9184.110.354.9

107.9237.0

63.1277.4

66.0170.143.7

232.2263.4

60.0147.216.437.2

272.6171.122.988.8

211.492.264.3

359.4324.5

31.6296.3230.6152.0

17.5146.2247.8119.716.57.0

38.949.1

261.7119.6

4.3122.2111.1273.6143.7146.5299.1107.6131.4332.2297.9336.3210.6134.582.6

284.24.4

220.4133.771.7

78.287.781.3

-53 .459.576.178.577.454.5

-43 .0-50 .0

62.846.554.475.0

-10 .9-15 .4-39 .5

7.3-64 .9

1.6-58 .7-77 .1-66 .0-43 .2

27.9-25 .4

59.178.754.530.039.133.6

5.017.854.7

-34 .4-58 .3

40.164.744.7

-83 .151.961.081.577.0

-56 .2-65 .7-56 .2-34 .0-48 .9

5.4-63 .0-66 .8-55 .4-55 .6-37 .2

8.4-27 .9-21 .2-21 .6-27 .1

27.7-38 .3-28 .5-37 .4-50 .7-54 .2-53 .8-54 .2-55 .4- 4 7 . 0-49 .6-56 .5-62 .6

1.761.674.184.036.951.171.153.991.252.21.11.363.093.174.053.62.31.162.613.041.562.692.001.861.671.072.043.694.241.261.917.052.789.771.744.571.891.631.531.081.957.62.943.562.372.70

10.374.451.548.748.051.002.172.151.831.835.146.592.182.424.111.671.542.602.861.603.084.515.422.506.142.932.975.665.97

X

×××××××××X

××X

××××××X

×XXX

××××××XXX

×XXXXX

××××X

×

XX

×

10101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010

1010

10

- 2

- 2- 3- 3- 2

- 3- 3

- 3- 5- 5- 3

- 3

- 2

- 3

- 2

- 3- 3- 3

- 5- 4- 3- 3- 2

160

100300

100

400

300

300250250

300100

450

50300200400400400150

200200750

480450450120100

240200

240200720

24032040064040024048012040024064080240240480

256

13.042.5

322.8

187.9

259.8

172.629.0275

243.035.9

292.6

0.428.8192.299.161.3295.1343.1

228.475.7276.1

77213.223.2188355.5

91121.2

296116.567145.8326119296314158126166283222548318144

307237

63

-46.3-53.7

-54.9-3.6-44.4

66.4-56.6

53.453.565.961.152.750.4-34.3

57.865.1-24.9

-65-60.3-48.3-47-42.2

-63-53.5

-49-46.7-53-22.1-29-23-33-40-28-33-33-55-54-56-59-55-65-65-59

8.9 × 10-3

1.412.02

× 10× 10

-3-4

-45.5 3.80 × 10-3

-52.9 1.94 × 10

-63.0 1.97 × 10-2

7.22 × 10-39.44 × 10"47.1 × 10 3

1.12 × 101.95 × 10

-3-2

-55.0 2.30 × 10-3

9.27 ×5.18 ×2.13 × 101.84 ×6.40 ×2.5 ×2.16 ×

-4-3-2-3-3-3- 2

8.36 × 101.95 × 108.89 × 10

5.22 × 102.31 × 10

1010

5.12 × 10

1.66 ×7.29 ×

6.02 × 107.84 × 10

-4-4-3

-1-1-1-1-1

-1-1

2.504.10 ×1.13 ×2.10 ×3.231.008.29 ×2.57 ×1.258.05 ×6.48 ×3.946.54 ×7.24 ×3.20 ×2.506.34 ×2.987.23 ×

-1-1

-1

-1-1-1

10

10

-1

-1

5.06.98.25.73.32.84.13.04.72.73.12.56.46.05.21.41.63.21.66.33.96.97.46-06.53.18.718.69.511.018.813.313.510.610.614.411.614.05.56.78.72.62.92.62.74.2

123.898.3108.6154.7285.098.391.665.2183.892.0190.7260.4110.060.474.069.165.076.467.678.8103.4113.682.087.779.2105.0103.587.177.6

842




Hole 553A (Cont.)

49-4, 19-2149-5, 14-1649-6, 49-5149-6, 97-9950-1, 128-13050-2, 123-12550-3, 88-9051-1, 88-9051-2, 63-6551-3, 30-3252-1, 21-2352-2, 59-6152-3, 24-2652-4, 41-4353-1, 87-8953-2, 83-8553-3, 15-1753-3, 142-14453-4, 24-2653-4, 63-6554-1, 3-554-2, 3-554-2, 60-6254-3, 119-12154-4, 105-10754-5, 75-7755-1, 100-10255-2, 75-7755-2, 140-14255-3, 77-7955-4, 75-7755-5, 75-7755-6, 93-9556-1, 52-5456-2, 35-3756-3, 34-3657-1, 109-11157-2, 30-3258-1, 43-4558-1, 133-13558-2, 67-6958-2, 129-13159-1, 53-5559-2, 107-10959-3, 114-11659-4, 101-103

Hole 554

2-3, 101-1032-4, 131-1332-5, 96-982-6, 38-403-2, 136-1383-4, 61-633-5, 35-373-6, 40-423-6, 100-1025-2, 76-785-3, 135-1375-5, 78-805-6, 78-806-5, 144-1466-6, 91-937-3, 134-1368-4, 45-47

Hole 554A

1-1, 91-932-1, 110-1122-2, 110-1123-1, 20-223-2, 20-223-3, 20-22

Decl.

148.1216.6341.6170.0281.3122.2299.2358.9

1.211.4

108207131290.1252.2265.9151.792.5

276.3289.399.6

271.5261.0128.8125.6143.3155.8288.845.0

295.48.9

202.7339.3147.841.9

3.1191.6226.6131.1196.0261.338.7

202.0257.6318.0114.4

77119275354248241

63183171703481861269046

116153

184181106184216188

Incl.

-59.8-61.4-62.0-66.4-52.6-48.2-48.2-48.2-48.1-55.4- 3 5- 5 1

- 9-48.4-56.0-60.8-59.8-65.6-61.8-64.0-66.3-64.1-74.0-62.4-59.9-61.4-30.7-53.3-51.6-59.4-13.9-53.3-58.3-55.5-64.1-68.3-52.5-46.4-46.8-46.0-44.7-57.0-46.3-48.5-52.8

52.9

- 7 643

369

1- 5 3- 8 6

472722

7305482

- 3 12460

213175

- 8 66377

Intensity(A/m)

5.976.135.223.402.903.021.992.783.112.972.464.721.52.772.612.322.525.833.305.764.373.313.775.095.384.362.28

13.2024.614.047.044.333.861.891.811.64

17.355.972.002.641.491.745.092.994.153.48

8.319.294.221.702.051.861.671.069.369.253.223.544.921.571.036.961.10

5.545.833.591.361.612.42

X

×X

×XX

×X

×××X

×XXXX

×

XXX

×XX

i o - l

10-310 A10-4

It)"?10-310-2lO-?io-?10-310-410 A10-410-410-410-510-5lO-4

10-410-410-310-310-3lO-4

AFD(×IO~I mT)

64024024016048024040080

160240160640320240400240880240160320480640400320120480240400640240320320640880480720640480480400480320640320640400

400

40

320480

Decl.

32736

165181117299124178182188118215137107857429

289123131248

8326733531733032010522312117741

159338228169

1554

30820175

2062659

134298

319

324

108304

Incl.

- 6 2- 6 1- 6 1- 6 5- 5 3- 5 5- 5 4- 4 8- 4 8- 5 7- 5 5- 5 0- 1 0- 4 9- 5 5- 5 9- 6 3- 7 5- 6 3- 6 2- 7 2- 6 4- 7 3- 6 2- 6 3- 6 3- 3 5- 5 6- 5 4- 6 1- 4 5- 6 7- 5 5- 6 2- 7 9- 7 2- 4 8- 4 9- 5 1- 5 2- 5 3- 5 3- 4 7- 5 0- 5 4- 6 3

52

8

5470

Intensity(A/m)

5.66 × 10" ]

4.133.773.322.02 X 10"8.46 × 10"1.62 × 10" ]

2.282.271.195.61 × 105.76 × 10"8.42 × 10"1

1.623.46 × 10"5.93 X 10",6.49 × 10""1.911.901.046.85 × 10~2.57 × 10"1.211.254.298.58 × 10"3.59 × 10"3.232.902.634.15 × 10"6.67 X 10"3.99 X 10"1.67 × 10"1.99 X 10"1.07 × 10"1.341.398.35 × 106.24 × 10"2.02 × 10-3.44 × 10"4.11 × 10~4.18 × 10"1.71 × 10"2.32 × 10"

9.67 × 10~

7.60 × 10"

1.46 × 10~8.69 × 10~

X(X 4x SI units)

87.383.693.5

197.260.053.961.672.548.843.754.069.8

162.476.593.6

1 133.184.162.486.386.1

100.4

96.189.6

119.1138.8145.9282.068.0

227.892.075.941.226.5

1 30.4141.571.929.1

62.883.281.174.846.458.5

5

5

iI

843




Hole 554A (Cont.)

3-4, 20-224-2, 10-124-2, 30-324-2, 50-524-2, 70-724-2, 95-974-2, 118-1204-2, 138-1404-3, 23-254-3, 58-604-3, 80-824-3, 118-1204-4, 20-225-1, 29-315-1, 70-725-1, 99-1015-1, 130-1325-2, 10-125-2, 41-435-2, 80-825-2, 110-1125-2, 146-1485-3, 22-245-3, 52-545-3, 80-825-3, 118-1205-4, 15-175-4, 58-605-4, 137-1396-1, 86-886-2, 83-856-2, 115-1176-3, 29-317-1, 110-1127-2, 29-317-3, 61-637-4, 34-368-1, 36-388-1, 55-578-1, 84-869-1, 110-11210-1, 66-6814-1, 70-72

Hole 555

1-1, 131-1331-2, 98-1001-2, 112-1141-3, 89-912-2, 35-372-4, 12-143-1, 15-173-1, 90-923-3, 76-783-4, 74-763-5, 75-773-5, 18-206-3, 126-1288-5, 23-259-2, 131-13311-3, 41-4312-2, 99-10114-1, 35-3715-1, 102-10416-4, 11-1317-3, 32-3418-2, 50-5219-2, 75-7722-1, 135-13724-1, 67-6924-4, 67-6924-7, 35-3725-3, 23-2525-5, 24-26

Decl.

317277294

61290273113190337308340253345193304318334205

3228160

85188355289296

2735752

35519

13359

113200

993013462521571816

221.748.8

224.1121.56191.8

330.9179205.298.7

201

213195923

102225232258166126105110137193162339152

Incl.

2654837385398972665774

- 2 04821553

6122727153

671359464661595664557256

- 5 764

- 6 2- 1 9- 4 4

95451

- 4 7

82.924.0

8.367.56262.756.3

- 5 557.853.7

- 4 4

716

- 2 5- 2 9

36- 4 2- 1 3- 2 5- 4 7

70- 6 7- 4 0- 8 3- 2 3

4- 724

Intensity(A/m)

1.49 × 10"3

6.55 X lO~4

9.20 × 10 ~^6.50 × 10 " 3

2.58 × 10"3

5.20 × 10 ~ *1.91 × 10" 4

2.62 × 10 " 3

6.46 × 1 0 " ,2.76 × 10~3

4.66 × lO~4

5.87 × 10" 4

1.70 × lO~4

1.58 × 10~3

9.50 × 10~5

1.59 × 10" 3

5.16 × 10" 4

1.40 × 10~5

7.40 × 10" 4

1.66 × lO~3

1.96 × 10 3

5.67 × 10" 3

1.88 × lO~3

6.86 × 10 ~ 4

6.79 × 10 " 4

6.00 × 10 ^5.13 × 1 0 " ;6.07 × 1 0 " ;4.48 × 10" 2

8.28 × lO~2

4.89 × 10" 2

6.67 × 10" j1.34 × 10" {2.69 × 10" 1

4.13 × 10" |4.00 × 10" *1.778.45 × 10~ 2

1.792.423.143.59

1.2 × lO~ 2

4.0 × lO~4

7.7 × 10";1.7 × 10";2.1 × lO~2

2.4 × 10";2.4 × 10"3

3.3 × lO~3

1.0 × lO~3

1.4 × lO~4

1.3 × lO~5

8.2 × 10"^3.8 × 10"5

2.1 × lO~5

2.1 × 10~*6.4 × 10"5

3.6 × lO~*9.0 × 10"°2.0 × 10"5

2.4 × 10";1.6 × 10";6.5 × 10";2.7 × 10"5

3.2. × lO~3

5.6 × lO~4

1.3 × lO~3

1.2 × 10"3

1.6 × 10"3

AFD(×IO~1 mT)

400

200

200

150

150

12080

240240

160480480320

480

Decl.

287

107

338

158

11

20649

2947

120336183152

123

Incl.

44

- 5 5

49

45

- 4 7

2316

- 1 0- 1 2

- 4 8- 6 6

2310

32

Intensity(A/m)

3.02

1.25

9.28

7.5

8.41

2.28.5

5.33.0

1.29.71.84.2

3.9

× 10"4

× 10"!

× lO~3

× 10" l

× 10" 1

× lO~f× lO~6

× lO~6

× 10"5

× lO~5

× 10"4

× 10"4

× 10"4

× 10"4

X(× 4* SI units)

•

1.52.23.33.1

2.02.0

0.9

844




Hole 555 (Com.)

26-5, 45-4726-6, 35-3727-1, 16-1827-2, 31-3327-2, 95-9727-2, 117-11927-3, 13-1528-1, 5-730.CC 5-731-1, 111-11332-1, 86-8832-2, 119-12132-3, 136-13832-4, 84-8632-5, 70-7232-6, 14-1633-1, 125-12733-2, 69-7133-3, 103-10533-4, 120-10433-5, 129-13133-6, 27-3134-1, 21-2334-2, 97-9934-3, 99-10134-4, 30-3234-4, 60-6234-5, 87-8935-1, 6-836-1, 35-3736-1, 104-10636-2, 12-1437-1, 77-7937-1, 77-7937-2, 100-10238-1, 118-12038-2, 122-12438-3, 124-12639-1, 97-9939-2, 109-11139-3, 114-11639-4, 93-9539-5, 76-7839-6, 81-8339-7, 22-2440-1, 26-2840-3, 19-2140-4, 54-5640-5, 35-3740-6, 115-11741-1, 108-11041-2, 104-10641-3, 103-10541-4, 100-10241-5, 10-1242-1, 73-7542-2, 126-12842-3, 97-9942-4, 8-1043-1, 135-13743-3, 91-9343-4, 13-1543-5, 70-7244-1, 48-5044-2, 89-9145-1, 66-6845-3, 82-8446-1, 23-2546-2, 63-6546-2, 95-9746-3, 88-9046-4, 92-9446-5, 76-7846-6, 40-4247-1, 144-146

Decl.

1967352

15279.9

149162213.5133.695.0

251.0224.869.866.7

319.0259.9309.0328.3321.7292.3104.5291.6255.1

87.3104291.6227.3223.1270.2

31.7308.5256.1104273.2

64.3177.4180.3183.4231.5206.0

56.0350.7287.5344.221.5

255.4194.0

3.9269.6171.8240.7115.0335.0328.2284.9125.0

12.587.174.715.4

292.0283.4328.172.2

254.3266.171.7

178.7333.8208.7

67.9273.228.4

321.4207.5

Incl.

4410

- 7 231

- 8 . 1- 1 3

1161.7

-33.033.759.974.974.373.510.550.8

-14.573.052.750.840.7

5.1- 1 . 2

5.30

-55 .610.30.9

-13 .43.9

-33 .93.1

3855.758.814.510.476.866.654.113.1

-18 .9-41 .6-12 .7

77.1-27 .6

15.2-58 .0

59.6-18 .8

5.5-34 .4

24.8-58 .2

30.8-51 .3

14.3-30 .0-27 .0

19.4-24 .5-27 .6-15 .1

52.4-15.5

0.442.4

-29 .4-60 .6-47 .4-52 .2-42 .6-57 .1-61 .8-57 .5

Intensity(A/m)

1.51.19.33.0

15.459.85.01.81.91.01.41.21.69.22.21.96.88.53.24.14.36.51.41.27.11.55.94.17.13.76.02.48.88.21.54.12.55.82.32.33.64.66.74.73.07.61.01.37.91.87.88.35.62.34.32.01.73.51.29.55.87.71.46.87.47.92.93.31.14.71.15.41.63.56.2

××XX

XXX

×XXXXXXXXXXXXX

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

X

c

lO-3

10"3

lO-3

lO-3

10-3lO-2

lO~2

10" 1

lO~ 1i

10"'10-2lO-2

lO-2

lO-2

10-310-2lO-2

10-2lO-2

10-4lO-2

lO-2

10~ 1

10-4lO-2

10-3

10-310-310

io-5

1010-210-2IO-4,10"2

10-210-210"2

10"210-2lO-3

10 — 210 — 3

10"2

10 ~ 4

10"2A

lO-4

10 " 3

10"210-2lO-2

1010-210-210-410" 3

10~3

io-3

10-41010-310-41010" *10"2

10" *10-2lO-2

10IO-4

AFD(×IO~1 mT)

400

160

320480

160

480

Decl.

88

353

12693

75

3

Incl.

- 7

28

75- 5 2

- 2 5

- 2 8

Intensity(A/m)

3.1 × 10" 4

2.5 × to" 3

7.3 × 10"31.6 × 10"3

2.6 × 10"2

1.6 × 10~2

X(×4ir SI units)

3.4

8.58.39.1

10.413.325.7

21.921.631.527.017.822.714.417.818.99.9

12.94.6

11.422.715.62.9

41.95.53.44.12.96.7

2.516.611.82.6

13.112.911.113.715.114.15.1

12.42.86.92.79.23.12.23.2

11.111.65.7

11.612.010.92.12.92.82.92.62.95.02.97.8

28.39.5

18.613.04.72.12.0

845




Hole 555 (Cont.)

47-2, 126-12847-3, 31-3347-4, 71-7348-1, 103-10548-2, 7-948-3, 96-9848-4, 95-9751-1, 26-2852-1, 102-10452-3, 76-7853-1, 93-9553-2, 61-6353-3, 33-3553-4, 114-11653-6, 70-7254-4, 85-8754-2, 122-12454-3, 97-9954.4, 77_7954-5, 95-9754-6, 52-5455-1, 59-6156-1, 121-12356-2, 47-4956-3, 53-5556-4, 114-11656-5, 43-4556-6, 124-12858-1, 44-4658-2, 133-13558-3, 128-13058-4, 98-10058-5, 26-2859-2, 23-2559-3, 55-5759-4, 89-9159-5, 129-13159-6, 89-8160-1, 80-8260-2, 10-1260-3, 7-960-4, 95-9760-5, 97-9960-6, 8-1060-7, 12-1461-1, 32-3461-2,9-1161-2, 36-3861-3, 117-11961-4, 64-6661-5, 40-4261-6, 15-1762-1, 89-9162-1, 107-10962-2, 19-2162-3, 60-6262-4, 42-4462-5, 66-6863-1, 7-963-1, 107-11964-1, 20-2264-2, 35-3764-3, 34-3664-4, 72-7464-4, 81-8364-5, 12-1465-1, 94-9665-2, 30-3266-1, 45-4767-1, 47-4967-2, 123-12567-3, 10-1267-4, 113-11568-1, 48-5068-2, 24-26

Decl.

67.9316.3358.4112341.5110.394.247.4

350.7151.4138.865.0

267.5225.9247.2269.6289343.5173254.3207.9118273

90328.0180.1176.161.9

183110.6286.2281.1306.4322.2108.460

169244.9

85.3181308.5l&>.l208156168220.617349.8

14414.6

127259106328.640.811.5

314.2352158232.1222149.9

12.3291.1327.5259.3307.8310.7

33.9296.7225.4292.8273.4181.3270.0

Incl.

71.674.477.65343.8

-41 .5-60 .2-16 .4-34 .0-37 .2-45 .1

2.937.9

- 3 . 842.520.0

- 1 3- 9 . 5- 3

4.4-29.1- 1 2

10- 4 9-43 .7- 5 . 1- 3 . 8

-20 .51361.534.8

- 2 . 327.436.279.7

- 2 51357.682.32468.757.74835

161.45875.57777.0

- 1 4- 1 6

2571.570.381.167.6

- 4 9- 4 2-41 .6- 4 3-27 .2-40 .0-30 .9-42 .5-62.7-31 .3-57 .4-72 .5-61 .3-18 .6-31 .4-32 .4

6.00.0

Intensity(

1.43.62.49.01.42.71.14.03.82.36.89.72.63.11.01.89.11.22.06.71.12.76.71.12.11.51.71.43.25.67.97.74.39.08.71.33.93.04.33.52.53.94.44.58.51.91.32.52.41.92.74.12.62.37.64.12.82.66.23.62.06.79.21.42.42.11.62.19.88.82.72.11.31.81.7

A/m)

× 10~4

× 10~4

× 10~4

× io~4

× IO~3

× 10~2× 10~2

× IO~3

× 10~4

× 10~3

× 10~4

× 10~4

× 10~3

× IO~3

× IO~3

× IO~3

× 10~4

× 10~3

× IO~3

× IO~3

× IO~3

× IO~3

× IO~3

× IO~2

× 10~2

× 10~2

× IO~2

× 10~2

× 10~4

× 10~4

× 10~4

× 10~4

× IO~4

× 10~4

× 10~4

× IO~3

× 10~4

× l0~.× 10~4

× 10~4

× 10~4

× 10~*× 10~4

× 10~4

× 10~4

× 10~4

× IO~3

× 10~4

× 10~4

× 10~4

× 10~4

× 10~4

× IO~3

× 10~3

× 10~4

× 10~4

× IO~3

× 10~3

× 10~2

× IO~2

× IO~2

× IO~2

× IO~3

× IO~2

× IO~2

× IO~2

× IO~2

× IO~2

× IO~3

× IO~3

× IO~2

× 10~2

× IO~1

× 10~3

× IO~2

AFD(×IO~ 1 mT)

240

320

480

320

240320

240

320

320

400

240

Decl.

19

361

286

190

13087

187

166

145

106

115

Incl.

54

- 4 5

0

- 2 8

25- 2 7

-8.3

31

25

- 3 5

61

Intensity(A/m)

1.9

2.8

2.2

5.6

2.27.9

4.5

1.1

3.2

4.0

8.4

×

×

X

×

××

×

×

×

×

X

10~4

10~4

IO~3

10~5

10~4

10~5

10~5

10~4

10~4

10~5

10~4

X(×4x SI units)

1.92.52.42.42.45.2

12.59.52.2

13.12.42.62.22.42.22.52.52.53.57.25.45.73.24.95.47.06.46.90.21.82.11.91.82.22.01.51.91.82.01.92.01.91.92.11.92.82.52.52.41.91.72.3

2.01.92.13.54.5

13.8

4.27.57.58.36.56.16.2

10.17.86.9

10.434.08.1

14.2

846




Hole 555 (Cont.)

68-2, 56-5868-3, 33-3569-1, 86-8869-1, 85-8769-2, 61-6369-2, 60-6269-3, 62-6469-3, 61-6369-4, 6769-4, 66-6869-5, 2569-5, 27-2969-6, 3370-1, 11770-1, 116-11870-2, 1570-2, 14-1670-2, 40-4271-1, 11-1372-1, 98-10072-2, 7-972-2, 31-3372-3, 109-11173-2, 120-12273-3, 68-7073-4, 45-4773-5, 36-3874-1, 22-2474-2, 116-11874-3, 47-4975-1, 73-7575-2, 36-3875-2, 43-4576-1, 48-5076-2, 23-2576-2, 124-12676-3, 25-2776-4, 78-8076-5, 33-3577-1, 91-9377-3, 67-6977-5, 81-8378-1, 67-6978-3, 28-3079-1, 34-3679-3, 127-12980-3, 39-4180-3, 125-12781-1, 100-10281-2, 88-9081-3, 86-8882-1, 99-10182-1, 129-13182-3, 102-10483-1, 30-3284-1, 126-12884-1, 142-14485-1, 47-4985-2, 107-10986-1, 26-2886-2, 44-4686-3, 124-12687-1, 39-4187-2, 10-1287-3, 60-6287-4, 16-1887-5, 31-3387-5, 120-12288-1, 130-13288-2, 30-3288-3, 33-3588-4, 26-2888-5, 4-689-1, 113-11590-1, 62-64

Decl.

320.5101.0105.9358219.5

5352.9

20555.5

198260.8

75267.066.89735.1

15811689

3233178

1139589

10694

338.650

175182.38052

358972325

21488

215219240.2

5752.2

185.469289082

10271

14692

326806785

134220

9438

147106

9108587341

2064344586081

247

Incl.

-51.5-54 .3-59.8- 6 6-46 .3- 4 4-51 .2- 6 4-53.1- 7 6- 8 . 8- 1 1

-30 .9-70 .4- 4 2-59.8- 6 5- 6 4- 1 4

24- 5 3

- 2- 3 7- 1 9

2- 1 4- 3 5-19 .4- 3 6- 5 5-52 .8- 3 3- 3 7- 5 0- 3 6- 4 6- 4 2- 5 4- 3 5

29- 7 1

41.6- 4 6-63 .3-54.5- 7 6- 7 2- 3 8- 1 3- 2 1- 9

- 4 8- 3 6- 5 9- 1 2- 3 3- 1 4

8- 5 2- 4 9

14- 2 7- 4 5- 1 5

g- 2 8

- 4- 4 5- 7 9- 2 7

19- 1 7- 3 4- 4 3- 7 2

Intensity(A/m)

3.05.13.03.04.95.34.43.92.82.51.83.01.21.47.61.61.42.83.22.41.22.52.03.92.93.41.73.39.31.62.18.83.32.03.94.21.73.12.92.21.32.55.31.83.74.56.54.91.21.41.42.11.44.37.64.25.01.91.36.25.66.15.17.11.87.21.16.01.87.18.27.82.61.55.7

× w~l× io ~;× 10~2

× lO~1

× 10~2

× 10~2

× 10~2

× 10"2

× IO~2,× io" 2

× i o .× io~;× io~;× io~ ;× io~ 2

× io~ 2

× io~1

× io~i× io~ 2

× io~ 2

× lO~J× i o .× IO~2

× IO~3

× lO~J× IO~1

× IO~ 2

× IO~1

× io~.× IO~3

× IO~2

× io~.× IO~3

× io~.× IO~3

× 10~3

× IO~3

× IO~2

× IO~3

× IO~2

× IO~3

× IO~3

× IO~3

× IO~3

× IO~3

× IO~3

× IO~3

AFD(×IO~1 mT)

640

480

320

640

640

480

400240880480480240240880880160240

880240

320480480400880400480480880400

880

880320160320480160140160320160720240320480320320480480320320240320240720480640720320880640

Decl.

154

128

189

199

170

169

112343176178357125131178180425184

1180

38130

2118354

36194129178348

164

15325914531

14872

252130328115359107149255220341167178292

112859

6229345417291

15014

Incl.

- 6 3

- 1 6

- 4 8

- 4 6

- 4 4

- 2 3

- 3 9- 5 6-20

- 8 1- 6 4- 3 7- 3 8- 3 9- 2 8- 3 9- 1 5

- 4 0- 5 8

- 4 0- 5 1- 4 3- 3 1- 4 0- 5 5- 4 0- 4 3- 5 2- 4 9

- 5 7

- 4 4- 4 5- 6 4- 4 8- 2 3- 3 3- 7 8-49

- 5 3- 4 3- 5 8- 5 8- 1 3- 5 2- 5 3- 3 9- 2 4- 5 8- 5 6- 4 3- 5 2- 3 9- 5 3- 6 8- 4 9- 7 2- 3 1- 6 6- 6 2- 6 6

Intensity(A/m)

1.1

8.2

9.6

8.9

7.5

9.9

4.41.01.59.01.44.73.31.52.31.07.1

2.51.2

2.61.74.35.21.84.08.02.85.65.2

4.5

9.13.41.21.23.01.91.23.11.98.19.21.33.81.36.51.71.11.12.73.82.51.83.34.91.31.47.87.82.81.9

×

X

×

X

×

×

××XX

×XX

×××X

XX

X

×XXX

×X

×X

×

X

XXXXXX

×XXXXXXXXX

×XXXXXXXXXXXX

×

10~ l

10~2

10~2

1O~2

10~3

10~3

10~3

io~2

10~2

lO~3,10~2

io~3

io~3

10~210~2

io~2

10~3

10~3

lO~1

io~?10~210~2

io~ 2

10"?lO~?io~ 2

10~210~2lO~2

10"2

i o - ;10~2lO~io-iio-2

io~i10~2

io-

io-210"tlO~ 1i o - 3

i o - 2

lO~lio~3

io~3

lO~ Ii o - 3

io-io~3

i o - 3

i o - 310~tio-3

io-3

io-4.IO-4

io~4

10~ 4

X( × 4 - SI units)

91.291.589.2

80.4

72.0

66.2

12.0

7.078.5

85.6

11.4

4.972.8

5.54.47.57.2

11.47.87.96.5

74.73.2

53.088.863.6

102.679.865.576.087.68.67.44.46.86.75.52.2

96.678.293.463.099.5

9.493.4

9471.84.46.89.26.07.28.66.57.8

10.010.06.57.75.03.18.56.26.83.23.0

146.0

847




Hole 555 (Cont.)

90-1, 115-11790-2, 87-8990-3, 86-8890-4, 69-7191-1, 43-4591-2, 97-9992-1, 94-9692-2, 86-8893-1, 80-8293-2, 53-5593-3, 80-8294-1, 88-9094-2, 24-2695-1, 30-3295-1, 45-4795-1, 143-14595-2, 101-10396-1, 114-11696-2, 105-11096-3, 79-8196-4, 56-5896-5, 97-9996-6, 90-9297-1, 88-9097-3, 109-11197-5, 4-697-7, 9-1198-2, 143-14598-4, 73-7598-5, 67-6798-6, 18-2098-7, 32-34

Decl.

10764

10081

12188

30382

10592.257

110241.111096

1453369

194155118355342295

9864

2402232234972

289.4

Inch

- 6 3- 3 5

- 9- 1 5- 2 8- 1 8

36- 5 4

0.16.1

- 2 2- 2 0-36.1- 4 5- 2 9- 3 2- 4 1- 4 0- 4 2- 4 4- 2 3- 4 9- 4 2- 4 4- 1 9- 3 8- 4 7- 4 0- 4 3- 3 9- 4 1

44

Intensity(

11.02.82.11.81.63.73.01.61.3

12.71.56.42.44.04.43.67.27.65.38.23.03.22.81.92.24.22.32.44.59.07.47.6

A/m)

× 10~3

× 10~3

× 10~3

× 10~2

× IO~:?× 10~3

× 10~5

AFD(×IO~1 mT)

48012060

16080

320720480400

75160320

320240880720640480640480720480880720480480240720320880500

Decl.

13249

14459

185221338132110134.333

132

1251161532862

19516013535033332610547

2482242044263

294

Incl.

- 6 5- 6 1- 2 2- 5 9- 6 2- 4 9- 3 8- 6 7- 3 7-88.2- 4 3- 3 3

- 4 5- 4 1- 3 8- 5 1- 4 4- 5 5- 5 1- 5 1- 5 0- 5 0- 5 2- 4 4- 4 2- 5 0- 4 4- 4 6- 4 2- 4 2

48

Intensity(

1.21.64.14.27.08.34.04.31.9

A/m)

× 10

× 10× 10× 10× 10× 10× 10× 10

1.2074.78.2

6.83.87.82.81.41.31.53.11.33.55.52.01.31.94.31.62.31.2

× 10× 10

× 10× 10× 10× 10× 10× 10× 10× 10× 10× 10× 10

× 10

× 10

- 1

- 1- 1- 1- 4- 4- 4- 3

- 3- 4

- 1- 1- 1- 1— 1- 1- 1- 1- 1- 1- 1

- 1

- 1

X(× 4π SI units)

94.5111.8125.0100.5129.7

7.55.55.48.47.37.84.72.0

34.4142.175.465.694.587.598.9

105.666.088.666.473.563.564.381.576.097.264.468.1

SAMPLING

In the relatively soft, unconsolidated and semicon-solidated sediments encountered in the upper parts ofthe holes, paleomagnetic samples were taken by push-ing plastic tubes (2.2 cm long and 2.5 cm in diameter)into the split core sections by means of a specially de-signed plunger supported by an aluminum bridge. Theends of the tubes were sealed with adhesive tape. In themore highly lithified material and basalts encounteredat deeper levels, either 2.5 cm-diameter cylindrical sam-ples were drilled from the cores or cube-shaped sampleswere cut by means of a diamond saw and trimmed toshape using a stainless steel scalpel. In all cases an ori-entation arrow pointing in the uphole direction was care-fully placed on the sample before it was removed fromthe core. Where inclined bedding was encountered andjudged to have resulted either from nonvertical drill pen-etration or from local movement of portions of the coreduring drilling, the orientation arrow was aligned per-pendicular to the bedding rather than parallel to the coreliner.

ASSIGNMENT OF POLARITY

Unlike conventional piston or gravity cores, DSDPcores are drilled by means of a rotating drill pipe (exceptin the uppermost, very soft sediments). This process cancause relative rotation (called "disking") between differ-ent parts of the core section, with consequent apparent

changes in the declination of magnetic remanence. Fur-thermore, the absolute azimuthal orientation of the coresis not normally measured, and relative azimuthal orien-tation is not maintained, from one 9.5-m core to thenext. For this reason the declination of remanence mag-netization is of limited use, except within individualcores in which disking is absent, or in the uppermostfew cores at each site, which are commonly drilled with-out rotation. During Leg 81a limited number of orient-ed cores were taken.

Consequently, in this study, magnetic polarity has beenassigned on the basis of the inclination of the stablecomponent of remanent magnetization alone. Since allsites are situated at moderate to high latitudes in theNorthern Hemisphere, positive magnetic inclinationsare taken to signify normal polarity and negative incli-nations are taken to indicate reversed polarity. Occa-sionally, in a series of samples taken from undisturbedportions of the same drill core, polarity reversals detect-ed on the basis of changes in sign of magnetic inclina-tion were corroborated by abrupt changes in declina-tion of approximately 180°.

REFERENCES

Hailwood, E. A., 1979. Paleomagnetism of late Mesozoic to Holo-cene sediments from the Bay of Biscay and Rockall Plateau drilledon Leg 48. In Montadert, L., Roberts, D. G., et al., Init. Repts.DSDP, 48:305-369.

Date of Acceptance: June 19, 1984

848


Inclination Intensity

0-1

5 0 -

100-

150-

200-

250-

300-

TD:314.00m —

10

15

20

rv

ONRM

CARM

-80 -60I I I I

-40 -20 0 20 40 60 80I I I I I I I | I I I i I

Susceptibility

6600103006790

x 10"3A/m

10 20 30 40I I I I

× 4π SI units

5 10 15I

20 25I

Figure 1. Paleomagnetics, Site 552.

849


x 10 x 4π SI units5 10 15 20 25-80 -60 -40 -20 0 20 40 60 80


850


10 20 30 40 5 %"i0 15 20 25


851

Documents

Deep Sea Drilling Project Initial Reports Volume 81 · PLATEAU, DEEP SEA DRILLING PROJECT LEG 811 K. Krumsiek, Geologisches Institut, Bonn and ... A/m to 6 × 10 ~5 A/m, and satisfactory