Multiple major faults at the Japan Trench; chemostratigraphy of the plate boundary at IODP Exp. 343; JFAST

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doi: 10.1016/j.epsl.2015.04.010
Author(s): Rabinowitz, Hannah S.; Savage, Heather M.; Plank, Terry; Polissar, Pratigya J.; Kirkpatrick, James D.; Rowe, Christie D.
Author Affiliation(s): Primary:
Lamont-Doherty Earth Observatory, Pasadena, NY, United States
Other:
Colorado State University, United States
McGill University, Canada
Volume Title: Earth and Planetary Science Letters
Source: Earth and Planetary Science Letters, Vol.423, p.57-66. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. Includes appendices. 44 refs.; illus., incl. 1 table, sketch map
Summary: We determine the trace element stratigraphy of Site C0019, drilled during the Japan Fast Trench Drilling Project (JFAST) International Ocean Discovery Program (IODP) Expedition 343, to illuminate the structure of the plate boundary following the Tohoku-Oki earthquake of 2011. The stratigraphic units at the JFAST site are compared to undeformed Western Pacific sediments from two reference sites (Ocean Drilling Program (ODP) Site 1149 and Deep Sea Drilling Project (DSDP) Site 436). The trace element fingerprints in these reference sedimentary units can be correlated to individual JFAST samples. At the JFAST site, we find that the accretionary wedge and downgoing plate sediments in the core are composed primarily of Holocene to Eocene sediments. There are several age reversals and gaps within the sequence, consistent with multiple faults in the bottom 15 m of the JFAST core. Our results point to several candidate faults that could have slipped during the 2011 Tohoku-Oki earthquake, in addition to the pelagic clay layer that has been proposed as the main decollement fault. Abstract Copyright (2015) Elsevier, B.V.
Year of Publication: 2015
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 16 Structural Geology; Accretionary wedges; Cenozoic; Chemostratigraphy; Clastic sediments; Clay; DSDP Site 436; Decollement; Deep Sea Drilling Project; Displacements; Earthquakes; Eocene; Expedition 343; Expeditions 343/343T; Faults; Holocene; IODP Site C0019; IPOD; Integrated Ocean Drilling Program; Japan Trench; Japan Trench Fast Drilling Project; Leg 185; Leg 56; Lithofacies; North Pacific; Northwest Pacific; ODP Site 1149; Ocean Drilling Program; Pacific Ocean; Pacific Plate; Paleogene; Plate boundaries; Quaternary; Sediments; Subduction; Tertiary; Thickness; Tohoku-Oki earthquake 2011; Trace elements; West Pacific
Coordinates: N375619 N375620 E1435449 E1435447
N312030 N312030 E1432100 E1432100
N395557 N395558 E1453329 E1453328
Record ID: 2015091171
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands