Data report; Tectonic and induced structures in the JFAST core

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doi: 10.2204/iodp.proc.343343T.204.2016
Author(s): Keren, Tucker T.; Kirkpatrick, James D.
Integrated Ocean Drilling Program, Expedition 343 Scientists, College Station, TX
Author Affiliation(s): Primary:
Colorado State University, Department of Geosciences, Fort Collins, CO, United States
Other:
Texas A&M University, United States
Japan Agency for Marine-Earth Science and Technology, Japan
University of Leicester, United Kingdom
GEOMAR-Helmholtz Centre for Ocean Research Kiel, Germany
University of Calcutta, India
CEREGE, France
University of Southampton, United Kingdom
University of Texas-Austin, United States
University of Bremen, Germany
University of Wisconsin-Madison, United States
University of Tokyo, Japan
University of California-Santa Cruz, United States
Osaka City University, Japan
Pennsylvania State University, United States
Universita di Modena e Reggio Emilia, Italy
McGill University, Canada
Northern Arizona University, United States
University of Victoria, Canada
University of Otago, New Zealand
University of Tsukuba, Japan
University of New Hampshire, United States
China Earthquake Administration, China
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Japan Trench Fast Drilling Project (JFAST); Expedition 343/343T of the riser drilling platform, Shimizu, Japan, to Sendai, Japan; Site C0019, 1 April-24 May 2012; and Minami-Ise, Japan, to Hachinohe, Japan; Site C0019, 5-19 July 2012
Volume Author(s): Mori, James J.; Chester, Frederick M.; Eguchi, Nobuhisa; Toczko, Sean; Kido, Yukari; Saito, Saneatsu; Sanada, Yoshinori; Anderson, Louise; Behrmann, Jan H.; Bose, Santanu; Conin, Marianne; Cook, Becky; Fulton, Patrick; Hirose, Takehiro; Ikari, Matt; Ishikmawa, Tsuyoshi; Jeppson, Tamara; Kameda, Jun; Kirkpatrick, James D.; Lin, Weiren; Mishima, Toshiaki; Moore, J. Casey; Nakamura, Yasuyuki; Regalla, Christine; Remitti, Francesca; Rowe, Christie; Sample, James; Sun, Tianhaozhe; Takai, Ken; Toy, Virginia; Ujiie, Kohtaro; Wolfson, Monica; Yang Tao
Source: Proceedings of the Integrated Ocean Drilling Program; Japan Trench Fast Drilling Project (JFAST); Expedition 343/343T of the riser drilling platform, Shimizu, Japan, to Sendai, Japan; Site C0019, 1 April-24 May 2012; and Minami-Ise, Japan, to Hachinohe, Japan; Site C0019, 5-19 July 2012, James J. Mori, Frederick M. Chester, Nobuhisa Eguchi, Sean Toczko, Yukari Kido, Saneatsu Saito, Yoshinori Sanada, Louise Anderson, Jan H. Behrmann, Santanu Bose, Marianne Conin, Becky Cook, Patrick Fulton, Takehiro Hirose, Matt Ikari, Tsuyoshi Ishikmawa, Tamara Jeppson, Jun Kameda, James D. Kirkpatrick, Weiren Lin, Toshiaki Mishima, J. Casey Moore, Yasuyuki Nakamura, Christine Regalla, Francesca Remitti, Christie Rowe, James Sample, Tianhaozhe Sun, Ken Takai, Virginia Toy, Kohtaro Ujiie, Monica Wolfson and Yang Tao; Integrated Ocean Drilling Program, Expedition 343 Scientists, College Station, TX; Integrated Ocean Drilling Program, Expedition 343T Scientists. Proceedings of the Integrated Ocean Drilling Program, Vol.343/343T, 13p. Publisher: International Ocean Discovery Program, Washington, DC, United States. ISSN: 1930-1014 CODEN: IDSDA6
Note: In English. 39 refs.; illus., incl. sect., sketch map
Summary: Structures surrounding the inferred location of the Japan Trench plate boundary decollement define the fault damage zone. We quantify the density of tectonic and induced structures in the damage zone from drill cores collected between 770 and 835 meters below seafloor from Hole C0019E during Integrated Ocean Drilling Program Expedition 343/343T, the Japan Trench Fast Drilling Project (JFAST). Cores contain structures formed by tectonic deformation and structures resulting from drill core recovery and handling. Differentiating between these two origins is essential for structural analyses and interpretation. We defined 10 styles of induced structures that we used to develop a new set of criteria for identifying induced structures in drill cores containing fine-grained sedimentary rocks. These criteria were used to categorize structures according to confidence in a tectonic origin. Our results show structure density (including all fractures, faults, breccias, and phyllosilicate bands) has a maximum adjacent to the decollement. This pattern in structure density is apparent for both exclusively tectonic structures and tectonic and induced structures combined. Local increases in induced structure density mask trends in tectonic structures, demonstrating that detecting trends in spatial variability in structure density is dependent on the recognition of induced structures. Additionally, the tectonic structure density increases where cores contain faults with significant displacements inferred from stratigraphic information, indicating that tectonic structure density can be used to identify secondary faults. We suggest that the criteria for identifying induced structures used in this study could be applied during visual core description in a variety of tectonic settings as a method to collect and assess reliable structural data.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 16 Structural Geology; Breccia; Cores; Crust; Decollement; Deformation; Expeditions 343/343T; Faults; Fractures; IODP Site C0019; Integrated Ocean Drilling Program; Japan Trench; Japan Trench Fast Drilling Project; North Pacific; Northwest Pacific; Oceanic crust; Pacific Ocean; Plate boundaries; Sedimentary rocks; Tectonics; West Pacific
Coordinates: N375619 N375620 E1435449 E1435447
Record ID: 2016028288
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