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学科主题: Geology
题名: Reconstructing chemical weathering, physical erosion and monsoon intensity since 25 Ma in the northern South China Sea: A review of competing proxies
作者: Clift, PD ; Wan, SM ; Blusztajn, J
通讯作者: pclift@lsu.edu
关键词: Monsoon ; Erosion ; Weathering ; Clay mineralogy ; Sediment geochemistry ; South China Sea
刊名: EARTH-SCIENCE REVIEWS
发表日期: 2014
卷: 130, 页:86-102
收录类别: sci
部门归属: [Clift, Peter D.] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA ; [Clift, Peter D.] Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China ; [Wan, Shiming] Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China ; [Blusztajn, Jerzy] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02540 USA
项目归属: 海洋地质
资助者: China NSF [41076033]; JOI-USSAC; University of Aberdeen
摘要: Reconstructing the changing strength of the East Asian summer monsoon has been controversial because different proxies, many being indirect measures of rainfall, tell contrasting stories about how this has varied over long periods of geologic time. Here we present new Sr isotope, grain-size and clastic flux data and synthesize existing proxies to reconstruct changing chemical erosion in the northern South China Sea since the Oligocene, using the links between weathering rates and monsoon strength established in younger sediments as a way to infer intensity. Chemical proxies such as K/Rb, l(/Al and the Chemical Index of Alteration (CIA), together with clay proxies like kaolinite/(illite + chlorite) show a steady decline in alteration after a sharp fall following a maximum at the Mid Miocene Climatic Optimum (MMCO; 15.5-17.2 Ma), probably as a result of cooling global temperatures. In contrast, physical erosion proxies, including bulk Ti/Ca and clastic mass accumulation rates (MAR), show peaks at 21-23 Ma, similar to 19 Ma and 15.5-17.2 Ma, implying faster run-off in the absence of drainage capture. Rates increase again, likely driven by slightly increased run-off after 13 Ma, but decrease after 8 Ma, which is identified as a period of summer monsoon weakening. Sr isotope composition correlates with hematite/goethite and the spectral proxy CRAT to show stronger weathering linked to more monsoonal seasonality. These proxies argue for a strengthening of the East Asian Monsoon after 22-23 Ma, followed by an extended period of monsoon maximum between 18 and 10 Ma, then weakening. There is some suggestion that the summer monsoon may have strengthened since 3-4 Ma after reaching a minimum in the Pliocene. (C) 2014 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000332431900004
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10640
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Clift, PD; Wan, SM; Blusztajn, J.Reconstructing chemical weathering, physical erosion and monsoon intensity since 25 Ma in the northern South China Sea: A review of competing proxies,EARTH-SCIENCE REVIEWS,2014,130():86-102
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