Proc. IODP, 314/315/316, Expedition 316 Site C0007

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Chapter contents Background and objectives Operations Positioning on Site C0007 Holes C0007A, C0007B, and C0007C Hole C0007D Lithology Unit I Unit II Unit III Unit IV Diagenesis X-ray CT number Structural geology Slump-related structures in Unit I Deformation structures in the prism Fault zones Biostratigraphy Calcareous nannofossils Other microfossil groups Summary Paleomagnetism Natural remanent magnetization and magnetic susceptibility Discrete samples and core orientation Magnetostratigraphy Inorganic geochemistry Salinity, chloride, and sodium Pore fluid constituents controlled by microbially mediated reactions Major cations (Ca, Mg, and K) Minor elements (B, Li, H₄SiO₄, Sr, Ba, Mn, and Fe) Trace elements (Rb, Cs, V, Cu, Zn, Mo, Pb, U, and Y) δ¹⁸O Organic geochemistry Hydrocarbon gas composition Sediment carbon, nitrogen, and sulfur composition Microbiology and biogeochemistry Sample processing Cell abundance Physical properties Density and porosity P-wave velocity and electrical conductivity in discrete samples Thermal conductivity In situ temperature Heat flow Shear strength Color spectrometry Magnetic susceptibility Natural gamma ray Integration with seismic data References Figures F1. Hole locations. F2. 3-D seismic profile. F3. Core recovery and sand and silt distribution. F4. Core examples. F5. XRD data. F6. Pumice. F7. Gravel and sand. F8. Common clast types in gravel. F9. Chert clasts. F10. Gravel. F11. Ash layers and ash. F12. Pyritized and ash-filled burrows. F13. Pleistocene age sand, Unit IV. F14. Silt grains with isopachous rims of oriented clay. F15. CT number vs. depth. F16. Distribution of planar structures. F17. Planar structures, lithologic Unit I. F18. Deformation, lithologic Unit I. F19. Planar structures in the prism. F20. Deformation bands in the prism. F21. Projections of deformation bands. F22. Healed faults in bioturbated hemipelagic mudstone. F23. Sediment-filled veins. F24. Elements in fault Zone 1. F25. Brecciated mudstone in fault Zone 1. F26. Elements in fault Zone 2. F27. Structures in fault Zone 2. F28. Elements in fault Zone 3. F29. Structures in fault Zone 3. F30. Projections of fracture surfaces. F31. Foliated fault gouge in fault Zone 3. F32. Deformation in fault Zone 3. F33. Age and depth. F34. Age reversal from Zones NN12 to NN16. F35. Magnetic susceptibility and NRM, Holes C0007A–C0007C. F36. Magnetic susceptibility and NRM, Hole C0007D. F37. AF demagnetization and thermal demagnetization. F38. Inclinations isolated from discrete samples. F39. Magnetic inclination, inferred polarity, and biostratigraphy. F40. Salinity, Cl, Na, and Na/Cl. F41. pH, SO₄, alkalinity, and Ba. F42. NH₄, PO₄, and Br. F43. Ca, Mg, K, H₄SiO₄, Rb, and Cs. F44. Li, B, and Sr, Mn, Fe, and Mo. F45. Cu, Zn, V, Pb, U, and Y. F46. δ¹⁸O profile. F47. Methane, ethane, and C₁/C₂. F48. CaCO₃, TOC, TN, C/N, and TS. F49. Microbial cell abundance. F50. SYBR Green I–stained cells. F51. Density and porosity. F52. Discrete sample measurements. F53. Thermal data. F54. Temperature time series. F55. Shear strength. F56. L, a, and b*. F57. Magnetic susceptibility. F58. NGR. F59. Hole correlations. Tables T1. Coring summary, Holes C0007A–C0007C. T2. Coring summary, Hole C0007D. T3. Lithologic summary, Holes C0007A–C0007C. T4. Lithologic summary, Hole C0007D. T5. XRD data, Holes C0007A–C0007C. T6. XRD mineralogy, Holes C0007A–C0007C. T7. XRD data, Hole C0007D. T8. XRD mineralogy, Hole C0007D. T9. Calcareous nannofossil range chart, Hole C0007C. T10. Calcareous nannofossil range chart, Hole C0007D. T11. Nnannofossil events. T12. Uncorrected geochemistry. T13. Uncorrected minor elements. T14. Uncorrected trace elements and δ¹⁸O. T15. Headspace hydrocarbon gases. T16. Sample depth and processing. T17. CaCO₃, TOC, TN, C/N, and TS. T18. Sample depth and processing. T19. Thermal conductivity. T20. Temperature measurements. PDF file			Previous \| Next doi:10.2204/iodp.proc.314315316.135.2009 Expedition 316 Site C0007¹ Expedition 316 Scientists² Background and objectives Integrated Ocean Drilling Program (IODP) Site C0007 (proposed Site NT1-03A; Kimura et al., 2007) targets the main frontal thrust at the seaward edge of the accretionary prism (Figs. F1, F2). This site was drilled during IODP Expedition 316 after hole conditions at IODP Site C0006 precluded reaching the main frontal thrust fault. Based on seismic data and submersible studies, this thrust was interpreted to have placed moderately consolidated (and presumably older) clastic rocks over weak and unlithified late Quaternary trench section clastic sediments (Ashi et al., 2002). Site C0007 is located trenchward of Site C0006. At this location, a thrust fault is observed in the seismic section at ~200 meters below seafloor (mbsf), and the frontal thrust is interpreted to occur at ~400 mbsf. The scientific objectives of drilling at Site C0007 are the same as those at Site C0006: to clarify the evolution of the frontal thrust from its birth to death, the function of the frontal thrust with respect to large earthquakes, and the relationship between fluid behavior, slip, and deformation within this fault zone. Hole C0007D was located ~185 m northwest (upslope) of Hole C0007C to avoid thick gravels encountered in Hole C0007C. The last core recovered from Hole C0007C reached 166.59 m core depth below seafloor (CSF). Because of its upslope position, initiation of coring at 175.00 m CSF in Hole C0007D allowed overlap with equivalent horizons from Hole C0007C, as identified in seismic profiles (Fig. F2). Core samples from Expedition 316 drilling at this site will be integrated with the existing three-dimensional (3-D) seismic and Site C0006 results to characterize physical properties, strength, composition, and structure of the hanging wall, frontal thrust, and footwall at this site. In situ temperature data were also collected to assess the thermal gradient and heat flow in this area. ¹Expedition 316 Scientists, 2009. Expedition 316 Site C0007. In Kinoshita, M., Tobin, H., Ashi, J., Kimura, G., Lallemant, S., Screaton, E.J., Curewitz, D., Masago, H., Moe, K.T., and the Expedition 314/315/316 Scientists, Proc. IODP, 314/315/316: Washington, DC (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.314315316.135.2009 ²Expedition 314/315/316 Scientists’ addresses. Publication: 11 March 2009 MS 314315316-135 Top of page \| Previous \| Next