Depositional architecture, provenance, and tectonic/eustatic modulation of Miocene submarine fans in the Shikoku Basin; results from Nankai Trough Seismogenic Zone Experiment

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doi: 10.1002/ggge.20107
Author(s): Pickering, Kevin T.; Underwood, Michael B.; Saito, Sanny; Naruse, Hajime; Kutterolf, Steffen; Scudder, Rachel; Park, Jin-Oh; Moore, Gregory F.; Slagle, Angela
Author Affiliation(s): Primary:
University College London, Department of Earth Sciences, London, United Kingdom
Other:
University of Missouri, United States
Japan Agency for Marine-Earth Science and Technology, Japan
University of Kyoto, Japan
IFM-GEOMAR, Germany
Boston University, United States
University of Tokyo, Japan
University of Hawaii at Manoa, United States
Lamont-Doherty Earth Observatory, United States
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 14(6), p.1722-1739. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 89 refs.; illus., incl. 1 table, sketch map
Summary: Seismostratigraphy, coring, and logging while drilling during Integrated Ocean Drilling Program Expeditions 319, 322, and 333 (Sites C0011/C0012) show three Miocene submarine fans in the NE Shikoku Basin, with broadly coeval deposits at Ocean Drilling Program Site 1177 and Deep Sea Drilling Project Site 297 (NW Shikoku Basin). The sediment dispersal patterns have major implications for paleogeographies at that time. The oldest, finer-grained (Kyushu) fan has sheet-like geometry; quartz-rich flows were fed mostly from an ancestral landmass in the East China Sea. During prolonged hemipelagic mud deposition at C0011-C0012 (∼12.2 to 9.1 Ma), sand supply continued at Sites 1177 and 297. Sand delivery to much of the Shikoku Basin halted during a phase of sinistral strike slip to oblique plate motion, after which the Daiichi Zenisu Fan (∼9.1 to 8.0 Ma) was fed by submarine channels. The youngest fan (Daini Zenisu; ∼8.0 to 7.6 Ma) has sheet-like geometry with thick-bedded, coarse-grained pumiceous sandstones. The pumice fragments were fed from a mixed provenance that included the collision zone of the Izu-Bonin and Honshu Arcs. The shift from channelized to sheet-like flows was favored by renewal of relatively rapid northward subduction, which accentuated the trench as a bathymetric depression. Increased sand supply appears to correlate with long-term eustatic lowstands of sea level. The stratigraphic position and 3-D geometry of the sandbodies have important implications for subduction-related processes, including the potential for focused fluid flow and fluid overpressures above and below the plate boundary fault: In sheet-like sands, pathways for fluid flow have greater horizontal permeability compared with those in channel sands. Abstract Copyright (2013), American Geophysical Union. All Rights Reserved.
Year of Publication: 2013
Research Program: DSDP Deep Sea Drilling Project
IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; Asia; Bathymetry; Bottom features; Cenozoic; Clastic rocks; Clastic sediments; Coarse-grained materials; Coral Sea; Cores; DSDP Site 297; Daiichi Zenisu Fan; Deep Sea Drilling Project; Earthquakes; East China Sea; Eustasy; Expedition 319; Expedition 322; Expedition 333; Far East; Faults; Fine-grained materials; Honshu Arc; IODP Site C0011; IODP Site C0012; Igneous rocks; Integrated Ocean Drilling Program; Izu-Bonin Arc; Japan; Kyushu; Leg 180; Leg 31; Marine sedimentation; Miocene; NanTroSEIZE; Nankai Trough; Neogene; North Pacific; Northwest Pacific; ODP Site 1117; Ocean Drilling Program; Ocean floors; Overpressure; Pacific Ocean; Philippine Sea; Plate tectonics; Provenance; Pumice; Pyroclastics; Sand; Sandstone; Sea-level changes; Sedimentary rocks; Sedimentation; Sediments; Seismic stratigraphy; Seismicity; Shikoku Basin; Solomon Sea; South Pacific; Southwest Pacific; Strike-slip faults; Subduction; Submarine fans; Tectonics; Tertiary; Three-dimensional models; Volcanic rocks; Well-logging; West Pacific; Woodlark Basin
Coordinates: N300000 N350000 E1380000 E1310000
Record ID: 2014029583
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom, Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union