LEG 197 PRELIMINARY REPORT 94
Figure F46
5 12 Unit 4 alkalic lava Unit 18
4 10 Unit 8 8 3 6 O (wt%)
2 2 4 CaO (wt%) Na Unit 18 1 2 Unit 8 Unit 4 alkalic lava 0 0 Unit 8 Unit 18 Unit 4 alkalic lava 20 Unit 4 alkalic lava 2 15 (wt%) 3 O O (wt%) 10 2 2
K 1 Al 5 Unit 18 Unit 8 0 0 Unit 18 Unit 8 Unit 8 3 300
(wt%) 2 Unit 18 200 2 Zr (ppm) TiO 1 100 Unit 4 tholeiitic lavas Unit 4 alkalic lava Unit 4 0 0 0 5 10 15 20 0 5 10 15 20 MgO (wt%) MgO (wt%)
Koko Seamount: Site 1206 Suiko Seamount Nintoku Seamount
Figure F46 LEG 197 PRELIMINARY REPORT 95
Figure F47
A 197-1206A-3R-2, 99-101 cm B 197-1206A-4R-5, 55-57 cm 1
0.8 ARM ARM IRM IRM
0.6
0.4
0.2 Normalized intensity
0 0204060800 20 40 60 80 100
C 197-1206A-9R-2, 29-31 cm D 197-1206A-16R-5, 75-77 cm 1
0.8 ARM ARM IRM IRM
0.6
0.4
0.2 Normalized intensity
0 0 20406080100 0 20 40 60 80 100
E 197-1206A-22R-1, 117-119 cm F 197-1206A-28R-1, 97-99 cm 1
0.8 ARM ARM IRM IRM
0.6
0.4
0.2 Normalized intensity
0 0 20406080100 0 20 40 60 80 100 120 AF field (mT) AF field (mT)
Figure F47 LEG 197 PRELIMINARY REPORT 96
Figure F48
A 197-1206A-3R-2, 99-101 cm B 197-1206A-4R-5, 55-57 cm 1
0.5
0
-0.5
Normalized intensity IRM acquisition IRM acquisition DC demagnetization DC demagnetization -1 0 100 200 300 400 500 0 100 200 300 400 500
C D 197-1206A-9R-2, 29-31 cm 197-1206A-16R-5, 75-77 cm 1
0.5
0
-0.5 IRM acquisition IRM acquisition Normalized intensity DC demagnetization DC demagnetization -1 0 200 400 600 800 0 100 200 300 400 500
E 197-1206A-22R-1, 117-119 cm F 197-1206A-28R-1, 97-99 cm 1
0.5
0
-0.5 IRM acquisition IRM acquisition Normalized intensity DC demagnetization DC demagnetization -1 0 100 200 300 400 500 0 200 400 600 800 Field (mT) Field (mT)
Figure F48 LEG 197 PRELIMINARY REPORT 97
Figure F49
A N, Up B N, Up
30
W E W E 35
S, Down S, Down 197-1206A-3R-4, 59-61 cm 197-1206A-7R-4, 64-66 cm
C D N, Up N, Up
W E W E 70 70
20 30
S, Down S, Down 197-1206A-16R-1, 33-35 cm 197-1206A-18R-2, 17-19 cm
E N, Up F N, Up
W E 70
30 W E 70
30
S, Down S, Down 197-1206A-20R-2, 85-87 cm 197-1206A-23R-1, 109-111 cm
Figure F49 LEG 197 PRELIMINARY REPORT 98
Figure F50 7 Fisher distribution around basalt mean 6 1206A inclination units (N = 14)
Hawaii Hole 1206A 5
4 Count 3
2
1
0 0 20 40 60 80 Inclination (°)
Figure F50 LEG 197 PRELIMINARY REPORT 99
Figure 51 cm
95
100
105
110
Figure F51 LEG 197 PRELIMINARY REPORT 100
Figure 52
Figure F52 LEG 197 PRELIMINARY REPORT 101
Figure 53
Figure F53 LEG 197 PRELIMINARY REPORT 102
Figure 54 FMS image (dynamic normalization) Plans tadpoles
Resistive Conductive Conductive features Dip plunge (°) 0 120 240 360 09030 60 640
641
642 Depth (mbsf)
643
644
Figure F54 LEG 197 PRELIMINARY REPORT 103
Figure 55 Accumulated angle (°) 0 3600 7200 10,800 14,400 18,000 21,600 0
500
1000
1500
Depth (mbrf) 2000
Downward
2500 Upward
BOP 3000 Open hole 3500
Figure F55 LEG 197 PRELIMINARY REPORT 104
Figure 56 vents To source To Nintoku Site 1205 T A C S A C A Lava pathway (tube) pathway Lava C Detroit Site 1204 Figure F56 A C a ’ Compound pahoehoe Simple pahoehoe Transitional a lava Pillow lobes) breccia and pillow foot delta (flow Lava Ocean Pacific T S A C Detroit Site 1203 A S S A C C Koko Site 1206 C C Tholeiite basalt (shield stage) Alkali basalt (postshield stage) Nearshore sandstone Bedded calcerous silt and sandstones intercalated with primary deposits fall tephra top flow Soil or weathered vents To source To Lithology type Flow LEG 197 PRELIMINARY REPORT 105
Figure 57
8 Hawaiite clasts
Mauna Kea shield stage alkalic lavas
6 Suiko Seamount lavas O (wt%) 2 4 O + K 2 Na 2 Alkalic Tholeiitic
Mauna Kea shield stage tholeiitic lavas 0 42 44 46 48 50 52 SiO2 (wt%)
Detroit Seamount: Sites 1203 and 1204 Nintoku Seamount: Site 1205 Koko Guyot: Site 1206
Figure F57 LEG 197 PRELIMINARY REPORT 106
Figure 58 A 0 Site 1203 Detroit Seamount
100
200
300 Depth (m in basement)
400
Tholeiitic Alkalic 500 -2 -1 0 1 2 3 40 60 80 100 120 140 Alkalinity Ti/Zr
Figure F58 LEG 197 PRELIMINARY REPORT 107
Figure 58 (continued) B 0 Tholeiitic Alkalic
100
Site 1205 Nintoku Seamount
200 Depth (m in basement)
0
100
Site 1206 Koko Guyot
200 Depth (m in basement)
Tholeiitic Alkalic 300 -2 -10123 40 60 80 100 120 140 Alkalinity Ti/Zr
Figure F58 (continued) LEG 197 PRELIMINARY REPORT 108
Figure 59
Figure F59 LEG 197 PRELIMINARY REPORT 109
Figure 60
Figure F60 LEG 197 PRELIMINARY REPORT 110
Figure 61
Figure F61 LEG 197 PRELIMINARY REPORT 111
Figure 62
cm
120
125
130
135
Figure F62