Climatically driven changes in the supply of terrigenous sediment to the East China Sea

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doi: 10.1029/2017GC007339
Author(s): Anderson, C. H.; Murray, R. W.; Dunlea, A. G.; Giosan, Liviu; Kinsley, C. W.; McGee, D.; Tada, R.
Author Affiliation(s): Primary:
Boston University, Department of Earth and Environment, Boston, MA, United States
Woods Hole Oceanographic Institution, United States
Massachusetts Institute of Technology, United States
University of Tokyo, Japan
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 19(8), p.2463-2477. Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English with English summary. 78 refs.; illus., incl. 1 table, sketch map
Summary: We examine the paleoceanographic record over the last ∼400 kyr derived from major, trace, and rare earth elements in bulk sediment from two sites in the East China Sea drilled during Integrated Ocean Drilling Program Expedition 346. We use multivariate statistical partitioning techniques (Q-mode factor analysis, multiple linear regression) to identify and quantify five crustal source components (Upper Continental Crust (UCC), Luochuan Loess, Xiashu Loess, Southern Japanese Islands, Kyushu Volcanics), and model their mass accumulation rates (MARs). UCC (35-79% of terrigenous contribution) and Luochuan Loess (16-55% contribution) are the most abundant end-members through time, while Xiashu Loess, Southern Japanese Islands, and Kyushu Volcanics (1-22% contribution) are the lowest in abundance when present. Cycles in UCC and Luochuan Loess MARs may indicate continental and loess-like material transported by major rivers into the Okinawa Trough. Increases in sea level and grain size proxy (e.g., SiO2/Al2O3) are coincident with increased flux of Southern Japanese Islands, indicating localized sediment supply from Japan. Increases in total terrigenous MAR precede minimum relative sea levels by several thousand years and may indicate remobilization of continental shelf material. Changes in the relative contribution of these end-members are decoupled from total MAR, indicating compositional changes in the sediment are distinct from accumulation rate changes but may be linked to variations in sea level, riverine and eolian fluxes, and shelf-bypass processes over glacial-interglacials, complicating accurate monsoon reconstructions from fluvial dominated sediment. Abstract Copyright (2018). American Geophysical Union. All Rights Reserved.
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; 07 Marine Geology and Oceanography; Asia; China; Clastic sediments; Climate effects; Continental crust; Continental shelf; Crust; Currents; East China Sea; Expedition 346; Far East; Fluvial sedimentation; IODP Site U1422; IODP Site U1423; IODP Site U1424; IODP Site U1425; IODP Site U1426; IODP Site U1427; IODP Site U1428; IODP Site U1430; Igneous rocks; Integrated Ocean Drilling Program; Japan; Japan Basin; Japan Sea; Kuroshio; Kyushu; Loess; Luochuan China; Monsoons; Multivariate analysis; North Pacific; Northwest Pacific; Ocean currents; Pacific Ocean; Provenance; Quantitative analysis; Reconstruction; Sediment supply; Sedimentation; Sediments; Statistical analysis; Taiwan warm current; Terrigenous materials; Ulleung Basin; Upper crust; Volcanic rocks; West Pacific; Xiashu China; Yamato Rise
Record ID: 2019000251
Copyright Information: GeoRef, Copyright 2019 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

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