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学科主题: Geochemistry & Geophysics
题名: Deep sea records of the continental weathering and erosion response to East Asian monsoon intensification since 14 ka in the South China Sea
作者: Hu, DK ; Boning, P ; Kohler, CM ; Hillier, S ; Pressling, N ; Wan, SM ; Brumsack, HJ ; Clift, PD
通讯作者: dhu@abdn.ac.uk
关键词: Chemical weathering ; Geochemistry ; Clay mineralogy ; Isotopes ; East Asian monsoon ; South China Sea
刊名: CHEMICAL GEOLOGY
发表日期: 2012
卷: 326, 页:41292
部门归属: [Hu, Dengke; Koehler, Cornelia M.; Clift, Peter D.] Univ Aberdeen, Sch Geosci, Aberdeen AB24 3UE, Scotland; [Hu, Dengke; Clift, Peter D.] Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Boening, Philipp; Brumsack, Hans J.] Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, D-26111 Oldenburg, Germany; [Hillier, Stephen] James Hutton Inst, Aberdeen AB15 8QH, Scotland; [Pressling, Nicola] Univ Southampton, Natl Oceanog Ctr, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England; [Wan, Shiming] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
项目归属: 海洋地质
摘要: We analyzed sediment from Ocean Drilling Program (ODP) Site 1144 in the northern South China Sea to examine the weathering response of SE Asia to the strengthening of the East Asian Monsoon (EAM) since 14 ka. Our high-resolution record highlights the decoupling between continental chemical weathering, physical erosion and summer monsoon intensity. Mass accumulation rates, Ti/Ca, K/Rb, hematite/goethite and Sr-87/Sr-86 show sharp excursions from 11 to 8 ka, peaking at 10 ka. Clay minerals show a shorter-lived response with a higher kaolinite/(illite + chlorite) ratio at 10.7-9.5 ka. However, not all proxies show a clear response to environmental changes. Magnetic susceptibility rises sharply between 12 and 11 ka. Grain-size becomes finer from 14 to 10 ka and then coarsens until similar to 7 ka, but is probably controlled by bottom current flow and sealevel. Sr and Nd isotopes show that material is dominantly eroded from Taiwan with a lesser flux from Luzon, while clay mineralogy suggests that the primary sources during the Early Holocene were reworked via the shelf in the Taiwan Strait, rather than directly from Taiwan. Erosion was enhanced during monsoon strengthening and caused reworking of chemically weathered Pleistocene sediment largely from the now flooded Taiwan Strait, which was transgressed by similar to 8 ka, cutting off supply to the deep-water slope. None of the proxies shows an erosional response lasting until similar to 6 ka, when speleothem oxygen isotope records indicate the start of monsoon weakening. Although more weathered sediments were deposited from 11 to 8 ka when the monsoon was strong these are reworked and represent more weathering during the last glacial maximum (LGM) when the summer monsoon was weaker but the shelves were exposed. (C) 2012 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000309847400001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10303
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Hu, DK; Boning, P; Kohler, CM; Hillier, S; Pressling, N; Wan, SM; Brumsack, HJ; Clift, PD.Deep sea records of the continental weathering and erosion response to East Asian monsoon intensification since 14 ka in the South China Sea,CHEMICAL GEOLOGY,2012,326():41292
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