Proc. IODP, 335, Site 1256

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Chapter contents Introduction Redescription of Expedition 312 Cores 312-1256D-202R through 234R Material recovered during Expedition 335 Igneous petrology Redescription of plutonic section recovered during Expedition 312 Cores recovered during Expedition 335 Rocks recovered during cleaning operations in Hole 1256D Discussion Geochemistry Basalt Granoblastic basalts Gabbroic rocks Downhole chemical variations Alteration and metamorphism Summary of Expedition 312 results Expedition 335 Sections 335-1256D-235R-1 through 239R-1 Expedition 335 junk baskets Expedition 335 rocks Structural geology Reevaluation of macroscopic structures in the Hole 1256D plutonic section Expedition 335 plutonic section Paleomagnetism Remanence data Multicomponent remanence in gabbroic rocks from Hole 1256D Origin of moderately inclined remanence components Magnetic susceptibility, NRM intensity, and Königsberger ratio Magnetic fabric Physical properties Multisensor core logger data Thermal conductivity Discrete sample measurements Magnetic susceptibility of Expedition 335 non-core material Downhole logging Operations Data quality Logging results Temperature logs Core section image analysis Underway geophysics References Figures F1. Stratigraphic column. F2. Age map. F3. Tools. F4. Thin sections. F5. Deepening of Hole 1256D. F6. Igneous stratigraphy. F7. Olivine and orthopyroxene mode. F8. Olivine-rich and olivine-poor gabbro. F9. Granoblastic basalt. F10. Tonalite in diorite. F11. Tonalite. F12. Oxide quartz diorite. F13. Leucocratic sample. F14. Oxide diorite patches. F15. Dike/dike contact. F16. Plagioclase. F17. Dioritic to tonalitic patches. F18. Diorite, amphibole, and zircon. F19. Diorite dikelet. F20. Tonalite patch. F21. Veins crosscutting granoblastic basalt. F22. Diorite dikelet. F23. Gabbro. F24. Clinopyroxene. F25. Fe-Ti oxide. F26. Olivine gabbro. F27. Basalt. F28. Albitite. F29. Albitite. F30. Loss on ignition. F31. Major element compositions. F32. Cr, Sc, Ni, V, Cu, and Zn. F33. Ba, Sr, Zr, and Y. F34. Ca#, TiO₂, and Ni. F35. Mg#, Zr, Zr/Y, Zn, and Cu. F36. Alteration. F37. Secondary minerals. F38. Background alteration. F39. Secondary mineralogy replacements. F40. Volume percent alteration patches. F41. Alteration patch. F42. Alteration mineralogy. F43. Vein density. F44. Veins. F45. Volume percent veins. F46. Alteration vs. degree of contact metamorphic recrystallization. F47. Degree of recrystallization. F48. Granoblastic recrystallization textures. F49. Alteration of granoblastic material. F50. Veins. F51. Amphibole veins. F52. Veins. F53. Felsic material. F54. Recrystallized dike contact. F55. Chilled margin. F56. Alteration of gabbroic rocks. F57. Structures. F58. Structural synthesis. F59. Igneous contact orientations. F60. Vein orientations. F61. Reoriented veins. F62. Gabbro 1. F63. Leucocratic patches. F64. SPO parameters. F65. SPO shape ratio. F66. SPO attitude. F67. Fracture orientations. F68. SIF density. F69. Gabbro microstructures. F70. Granoblastic dike microstructures. F71. Foliated gabbro. F72. Vein network. F73. Vein network. F74. Vein crosscutting relationships. F75. Leucrocratic and granoblastic basaltic material contact. F76. Shear veins. F77. AF demagnetization experiments. F78. AF demagnetization. F79. AF demagnetization data. F80. Thermal demagnetization data. F81. Remanence components. F82. Magnetic properties. F83. DIRM/VDS vs. ChRM inclination. F84. Geomagnetic field directions. F85. Tectonic tilting. F86. NRM and susceptibility. F87. AMS data. F88. WRMSL, SHMSL, and NGRL measurements. F89. K, Th, and U. F90. Color reflectance data. F91. Thermal conductivity measurements. F92. Thermal conductivity probe. F93. Thermal conductivity vs. angle of half-space needle probe. F94. P-wave velocity. F95. Bulk density, porosity, and P-wave velocity. F96. Magnetic susceptibility measurements. F97. Log summary. F98. Log comparison. F99. Hole size. F100. Log summary. F101. Temperature log. F102. Photographs. F103. Photographs. Tables T1. Operations and sampling. T2. Grain counting. T3. Junk basket samples. T4. Igneous unit description. T5. Weight and abundance of material. T6. Size and weight of cobbles. T7. Major and trace element compositions. T8. Paleomagnetic summary. T9. AMS. T10. Thermal conductivity. T11. Thermal conductivity. T12. Density, porosity, and compressional velocity. T13. Logging operations. PDF file			Previous \| Next doi:10.2204/iodp.proc.335.103.2012 Underway geophysics While transiting between Costa Rica and Site 1256 during Expedition 335, we collected echo sounder data over most of 860 km of trackline and magnetometer data over most of 730 km of trackline away from shipping lanes. The profile covers the early record of spreading between the Cocos and Pacific plates. Magnetic and bathymetric data were also collected on the transit from Site 1256 to Panama. Top of page \| Previous \| Next

Underway geophysics