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Reconstructing chemical weathering, physical erosion and monsoon intensity since 25 Ma in the northern South China Sea: A review of competing proxies
Clift, PD; Wan, SM; Blusztajn, J; pclift@lsu.edu
2014
发表期刊EARTH-SCIENCE REVIEWS
ISSN0012-8252
卷号130页码:86-102
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.
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
关键词Monsoon Erosion Weathering Clay Mineralogy Sediment Geochemistry South China Sea
学科领域Geology
资助者China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen
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收录类别sci
资助项目海洋地质
资助者China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen ; China NSF [41076033]; JOI-USSAC; University of Aberdeen
WOS记录号WOS:000332431900004
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被引频次:89[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/10640
专题中科院边缘海地质重点实验室
通讯作者pclift@lsu.edu
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Clift, PD,Wan, SM,Blusztajn, J,et al. Reconstructing chemical weathering, physical erosion and monsoon intensity since 25 Ma in the northern South China Sea: A review of competing proxies[J]. EARTH-SCIENCE REVIEWS,2014,130:86-102.
APA Clift, PD,Wan, SM,Blusztajn, J,&pclift@lsu.edu.(2014).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,130,86-102.
MLA Clift, PD,et al."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 130(2014):86-102.
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