Increased contribution of terrigenous supply from Taiwan to the northern South China Sea since 3 Ma

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doi: 10.1016/j.margeo.2010.09.008
Author(s): Wan Shiming; Li Anchun; Clift, Peter D.; Wu Shiguo; Xu, Kehui; Li Tiegang
Author Affiliation(s): Primary:
Chinese Academy of Sciences, Key Laboratory of Marine Geology and Environment, Qingdao, China
Other:
Coastal Carolina University, United States
Volume Title: Marine Geology
Source: Marine Geology, 278(1-4), p.115-121. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. Supplementary information/data is available in the online version of this article. 46 refs.; illus., incl. sketch map
Summary: Seismic profiles provide evidence that there has been strong transport by deep-water bottom currents and drift deposition on the northern slope of the South China Sea. Earlier geochemical studies suggest that the drift sediments originated primarily from Taiwan. However, the transport process, history and origin of the deep-water bottom deposition in the northern South China Sea, on both glacial-interglacial and tectonic time scales, remain unclear. Here, we show new high-resolution records of clay minerals, grain size and mass accumulation rate (MAR) of terrigenous materials from Ocean Drilling Program (ODP) Site 1144, together with trace element concentrations in siliciclastic sediments from ODP Site 1146. Combined with other published data, we find that the primary source for sediments at ODP Sites 1144-1148 since 3Ma is from Taiwan, and not from Pearl River as previously thought. Before 3Ma, however, sediment source to ODP Sites 1146 and 1148 was mainly from the Pearl River. Increased contribution of terrigenous supply from Taiwan to the northern South China Sea since ≈3Ma may be related to the formation of the Taiwan Orogen and strengthening of deep-water bottom current transport in the northern South China Sea. Variations in clay mineralogy and sedimentology at ODP Site 1144, located on a sediment drift, shows strong glacial-interglacial cyclicity. This suggests that bottom current deposition is highly dependent on sea-level fluctuations, which control the terrigenous supply to the deep sea. Abstract Copyright (2010) Elsevier, B.V.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Asia; Bottom currents; Cenozoic; Clay mineralogy; Currents; Deep-water environment; Depositional environment; Far East; Geophysical methods; Geophysical profiles; Geophysical surveys; Grain size; Leg 184; Marine sedimentation; Marine sediments; Neogene; North Pacific; Northwest Pacific; ODP Site 1144; ODP Site 1145; ODP Site 1146; ODP Site 1148; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Pliocene; Provenance; Quaternary; Sea-level changes; Sediment supply; Sediment transport; Sedimentation; Sedimentation rates; Sediments; Seismic methods; Seismic profiles; South China Sea; Surveys; Taiwan; Terrigenous materials; Tertiary; Transport; West Pacific
Coordinates: N185010 N210010 E1173356 E1163356
Record ID: 2011022141
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands