Proc. IODP, 322, Site C0012

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Chapter contents Background and objectives Operations Hole C0012A Hole C0012B Typhoon evacuation and transit Lithology Lithologic Unit I (upper Shikoku Basin) Lithologic Unit II (middle Shikoku Basin) Lithologic Unit III (lower Shikoku Basin hemipelagites) Lithologic Unit IV (lower Shikoku Basin turbidites) Lithologic Unit V (volcaniclastic-rich) Lithologic Unit VI (pelagic claystone) Lithologic Unit VII (Kashinosaki Knoll basement) X-ray diffraction analyses X-ray fluorescence analyses Lithofacies at Site C0012 Sediment accumulation rates at Site C0012 Paleogeography and sediment provenance at Site C0012 Comparison between Site C0012 and ODP/IODP sites Structural geology Bedding Deformation structures Biostratigraphy Calcareous nannofossils Planktonic foraminifers Sedimentation rates based on biostratigraphy Paleomagnetism NRM, magnetic susceptibility, and Königsberger ratio Paleomagnetic stability tests Polarity sequence and magnetostratigraphy Integrated age model and sediment accumulation rates Paleomagnetic reorientation of the cores Paleomagnetic characterization of basement rocks Anisotropy of magnetic susceptibility Physical properties MSCL-W MAD measurements Shear strength Anisotropy of P-wave velocity and electrical resistivity Thermal conductivity Comparison with Site C0011 and Sites 1173 and 1177 Core quality and physical properties Inorganic geochemistry Fluid recovery Biogeochemical processes Halogen concentration (Cl and Br) Chemical changes due to alteration of volcaniclastics Basal fluids Organic geochemistry Hydrocarbon gases Hydrogen gas Carbon, nitrogen, and sulfur contents of the solid phase Characterization of the type and maturity of organic matter by Rock-Eval pyrolysis Microbiology Logging and core-log-seismic integration Hole C0012 B logging data quality Seismic analysis References Figures F1. Line 95 showing Sites C0011 and C0012. F2. Summary lithology. F3. Thickness of turbidites. F4. Chaotic deposit in Unit II. F5. Smear slide data. F6. Photomicrographs of smear slides. F7. Steeply inclined bedding in Unit III. F8. Lime mudstone correlation. F9. Laminated volcaniclastic siltstone sandstone. F10. Smear slide data for sandstones of Unit V. F11. Red calcareous claystone overlying basalt basement. F12. Close-up photographs of basement material. F13. Photomicrographs of basalts. F14. Close-up photographs of heterogeneous basalt pieces. F15. Photomicrographs of different alteration types. F16. Photomicrographs and close-up photographs of altered basalts. F17. Photographs of different alteration types. F18. Major elements in bulk rocks. F19. Lithology and bulk powder XRD. F20. Lithology and major elements from XRF. F21. 3-D PSDM seismic reflection profile, In-line 95. F22. Ratio of turbidites to hemipelagites. F23. Depth profiles of TOC/TN. F24. Dip angle variation of bedding and fault planes. F25. Stereo plots of bedding plane and faults after paleomagnetic correction. F26. Layer-parallel faults. F27. High-angle fault. F28. Bioturbated dark deformation band. F29. Mineral-filling vein and layer-parallel veins. F30. Sheath folding in laminated volcaniclastic sandstone. F31. Schematic of submarine slide event. F32. Chronostratigraphic correlation based on calcareous nannofossils and planktonic foraminifers. F33. Deformed planktonic foraminifers. F34. Sedimentation rates based on calcareous nannofossils. F35. Paleomagnetic measurements on discrete samples. F36. Histogram of inclinations. F37. Vector endpoint diagrams of magnetization. F38. Age models. F39. Vector endpoint diagrams of magnetization directions, basement basaltic rocks. F40. Downhole plot of parameters for AMS. F41. MSCL-W results. F42. MAD results, discrete mud(stone) and sand(stone) samples. F43. Undrained shear strength in the shallow section. F44. P-wave velocity and horizontal and vertical-plane anisotropy on discrete cube samples. F45. P-wave velocity versus porosity for discrete samples. F46. Electrical resistivity and vertical-plane anisotropy for discrete cube samples. F47. Porosity versus thermal conductivity. F48. Interstitial water volume recovered from whole-round sections. F49. Interstitial water cations and anions. F50. Interstitial water major elements. F51. Interstitial water trace elements. F52. Sulfate distribution compared with ODP Leg 190 Sites. F53. Estimated saturation indexes. F54. Methane, ethane, and C₁/C₂. F55. Inorganic carbon, TOC, TN, and total sulfur. F56. C₁/C₂ versus temperature. F57. H₂ concentrations in sediment samples as a function of time. F58. Rock-Eval pyrolysis. F59. 3-D PSDM seismic reflection profile, Cross-line 435. Tables T1. Coring summary. T2. Lithologic units. T3. Bulk powder XRD analysis. T4. XRF analysis. T5. Stratigraphic relations correlated to units in ODP and IODP sites. T6. Model B paleomagnetic and biostratigraphic age datums. T7. Calcareous nannofossil distribution. T8. Planktonic foraminifer distribution. T9. Calcareous nannofossil events and absolute age. T10. Planktonic foraminifer events and absolute age. T11. Model A paleomagnetic and biostratigraphic age datums. T12. Paleomagnetic directions for reorientation of coherent blocks. T13. Paleomagnetic results, basaltic samples. T14. Mudstone MAD data. T15. Sandstone MAD data. T16. Shear strength data. T17. P-wave velocity. T18. Electrical resistivity data. T19. Thermal conductivity data. T20. Interstitial water geochemistry. T21. Estimated major ion concentration at pore fluid anomaly. T22. Hydrocarbon gas composition. T23. H₂ concentration. T24. Carbon, nitrogen, and sulfur contents. T25. Type and maturity of organic matter. T26. Sample depth and type distribution. 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