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197 Preliminary Report 94 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 Figure 56 P L EG RELIMINARY Nintoku To source 197 Site 1205 vents To source Koko Detroit Detroit vents Site 1206 Site 1203 Site 1204 R EPORT T C S C A C Pacific Ocean S CA C C A Lava pathway (tube) SA CA CA Lithology Flow type Tholeiite basalt (shield stage) C Compound pahoehoe Alkali basalt (postshield stage) S Simple pahoehoe Nearshore sandstone T Transitional Bedded calcerous silt and sandstones intercalated A a’a with primary tephra fall deposits Pillow lava Soil or weathered flow top Lava delta (flow foot breccia and pillow lobes) Figure F56 104 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.
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