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学科主题: Paleontology
题名: Productivity and continental denudation history from the South China Sea since the late Miocene
作者: Zhang, LL ; Chen, MH ; Xiang, R ; Zhang, LL ; Lu, J
通讯作者: zhanglili1978108@163.com
关键词: Late Miocene ; Southern South China Sea ; Radiolarian ; Asian monsoon ; Weathering ; Productivity
刊名: MARINE MICROPALEONTOLOGY
发表日期: 2009
卷: 72, 期:40545, 页:76-85
收录类别: sci
部门归属: [Zhang, Lili; Chen, Muhong; Xiang, Rong; Zhang, Lanlan; Lu, Jun] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Zhang, Lili; Zhang, Lanlan] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China; [Zhang, Lili] CNOOC Ltd, Shenzhen Branch, Res Inst, Guangzhou 510240, Guangdong, Peoples R China
项目归属: 海洋地质
摘要: Late Miocene-Recent micropaleontological and geochemical records from Ocean Drilling Program (ODP) Site 1143 in the southern South China Sea (SCS) indicate that increase and decrease in abundance of siliceous plankton may be controlled mainly by the input of nutrients derived from land and provided by upwelling. A high export production event - a "biogenic bloom" event - occurred in the southern SCS between 12 and 6 Ma. During this period, high ratios of smectite/(illite + chlorite), smectite/quartz and Al/K indicate a high weathering intensity of the Asian continent, possibly due to the intensification of the East Asian Summer Monsoon (EASM), which may have increased the net flux of nutrients to the ocean, both directly through terrestrial input and indirectly through upwelling activity. A drop in Ba/Ti, Al/Ti and Ca/Ti values around 6 Ma may indicate a lowering of productivity, possibly due to the large consumption of sea surface nutrients by the "biogenic bloom". Alternatively. it may indicate a shift in terrigenous input source area. At about 5.4 Ma, a decrease in weathering intensity, as indicated by a sudden decrease in the values of smectite/ (illite + chlorite), smectite/quartz and Al/K, might have led to a sudden decrease of terrestrial nutrient input to the SCS. We suggest that the biogenic bloom ended when nutrients in surface waters were exhausted, because of a decrease in supply as well as a decrease in upwelling intensity due to weakening of the EASM. As a result, radiolarians were absent in the studied area between similar to 6 and 3.2 Ma. At similar to 3.2 Ma, radiolarians began to recover, possibly because the start of Northern Hemispheric glaciation and the rapid uplift of the Tibet Plateau led to intensification of the East Asian monsoon. After the Mid-Pleistocene Climate Transition at 0.9 Ma, the abundance and mass accumulation rates of radiolarians increased, probably as a result of increased upwelling activity driven by the increasing intensity of the summer monsoon. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000267515500007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4614
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhang, LL; Chen, MH; Xiang, R; Zhang, LL; Lu, J.Productivity and continental denudation history from the South China Sea since the late Miocene,MARINE MICROPALEONTOLOGY,2009,72(40545):76-85
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