Proc. IODP, 348, Data report: a brittle (normal?) shear zone from Hole C0002P: deformation structures and their relationship with calcite veins (IODP Expedition 348, Nankai Trough accretionary prism)

IODP Proceedings Volume contents Search


Expedition reports Research results Supplementary material Drilling maps Expedition bibliography
Chapter contents Abstract Introduction Data and methodology Results Macroscopic observations Deformation structures observed in thin sections Discussion Deformation regime and kinematics Brecciation and timing of the veining Concluding remarks Acknowledgments References Figures F1. Regional location map and schematic cross-section. F2. Section 348-C0002P-5R-4. F3. Section 5R-4 thin section locations. F4. Sandstone and silty claystone. F5. Lentil-type clasts. F6. TS 78–85. F7. Microfaults. F8. Drag fold. F9. Array of microfaults. F10. Vein formed of aggregates of small calcite grains. F11. Vein formed of aggregates of small calcite grains. F12. Lentil-shaped aggregates. F13. Vein formed of swarms of veinlets. F14. Veinlets with a rhombic geometry. F15. Veinlets sealing cataclastic deformation. F16. Microfault cutting a veinlet. F17. Elongated calcite grains and wall rock inclusion bands. F18. Deformation structures, vein geometry, and apparent orientation in fault zone. PDF file			Previous \| Next doi:10.2204/iodp.proc.348.205.2017 Data report: a brittle (normal?) shear zone from Hole C0002P: deformation structures and their relationship with calcite veins (IODP Expedition 348, Nankai Trough accretionary prism)¹ Ana Crespo-Blanc² Abstract A brittle shear zone was sampled from Hole C0002P in the Nankai accretionary prism during Integrated Ocean Drilling Program Expedition 348. Macro- and microscopic structures observed both in the core and the covered petrographic thin sections of this fault zone permit characterization of the deformation during faulting. The observed kinematic indicators are coherent with an apparent normal fault sense with respect to its present-day position. Calcite veins are restricted to the most damaged interval of the cored fault. Descriptions of the vein geometry and relationship with the cataclastic foliation present in the fault suggest that these are extension veins that opened during a crack-seal. The various generations of veins suggest that a reiterative history of brecciation and veining took place. ¹ Crespo-Blanc, A., 2017. Data report: a brittle (normal?) shear zone from Hole C0002P: deformation structures and their relationship with calcite veins (IODP Expedition 348, Nankai Trough accretionary prism). In Tobin, H., Hirose, T., Saffer, D., Toczko, S., Maeda, L., Kubo, Y., and the Expedition 348 Scientists, Proceedings of the Integrated Ocean Drilling Program, 348: College Station, TX (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.348.205.2017 ² Departamento de Geodinámica-Instituto Andaluz Ciencias de la Tierra, Facultad de Ciencias, Universidad de Granada-Consejo Superior de Investigación Científica, Fuentenueva s/n, 18071 Granada, Spain. acrespo@ugr.es Initial receipt: 29 September 2016 Acceptance: 3 February 2017 Publication: 27 April 2017 MS 348-205 Top of page \| Previous \| Next