期刊
INTERNATIONAL GEOLOGY REVIEW
卷 60, 期 15, 页码 1816-1854出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00206814.2017.1393634
关键词
Oligocene-Recent; deep-sea sediments; tuffaceous sediments; oceanic crust; magnetic data; biostratigraphy; Izu-Bonin forearc; IODP Expedition 352; northwest Pacific region
类别
资金
- UK Natural Environmental Research Council, SF/USSSP postcruise [COL-T352A13]
- German Research Foundation (DFG) [KU2685/4-1, SCHI1349/1-1]
- IODP-JRSO
- NSF/USSSP postcruise grant [COL-T352A13]
- Australian-New Zealand IODP Consortium (ANZIC) IODP [ARC-LE0882854]
- NERC [NE/M008193/1] Funding Source: UKRI
New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary and tectono-magmatic development of the Izu-Bonin outer forearc region. The oceanic basement of the Izu-Bonin forearc was created by supra-subduction zone seafloor spreading during early Eocene (c. 50-51 Ma). Seafloor spreading created an irregular seafloor topography on which talus locally accumulated. Oxide-rich sediments accumulated above the igneous basement by mixing of hydrothermal and pelagic sediment. Basaltic volcanism was followed by a hiatus of up to 15 million years as a result of topographic isolation or sediment bypassing. Variably tuffaceous deep-sea sediments were deposited during Oligocene to early Miocene and from mid-Miocene to Pleistocene. The sediments ponded into extensional fault-controlled basins, whereas condensed sediments accumulated on a local basement high. Oligocene nannofossil ooze accumulated together with felsic tuff that was mainly derived from the nearby Izu-Bonin arc. Accumulation of radiolarian-bearing mud, silty clay, and hydrogenous metal oxides beneath the carbonate compensation depth (CCD) characterized the early Miocene, followed by middle Miocene-Pleistocene increased carbonate preservation, deepened CCD and tephra input from both the oceanic Izu-Bonin arc and the continental margin Honshu arc. The Izu-Bonin forearc basement formed in a near-equatorial setting, with late Mesozoic arc remnants to the west. Subduction-initiation magmatism is likely to have taken place near a pre-existing continent-oceanic crust boundary. The Izu-Bonin arc migrated northward and clockwise to collide with Honshu by early Miocene, strongly influencing regional sedimentation.
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