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Sedimentary responses to sea-level rise and Kuroshio Current intrusion since the Last Glacial Maximum: Grain size and clay mineral evidence from the northern South China Sea slope
Liu, Jianguo; Xiang, Rong; Kao, S. -J.; Fu, Shaoying; Zhou, Liping; Liu, JG (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
2016
发表期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号450页码:111-121
摘要We analyzed the terrigenous fraction of a sediment core from the northern slope of the South China Sea, to better understand the depositional history of the region since the Last Glacial Maximum (LGM). Temporal variations in the grain size and clay mineral composition revealed a complex set of overlapping controls. Approximately 90% of terrigenous sediment throughout the core ranged in size from 55 to 8.5 Phi, with the 525-6.25 Phi size class being particularly sensitive to environmental changes. The proportion of this fraction decreased during deglacial, indicating a reduction in the supply of coarser grains due to coastline retreat. As the sea level rose toward its present position, the relative proportion of clay derived from Taiwan increased; however, the mass accumulation rate of Taiwan-derived clay decreased, suggesting a reduction in the westward bottom current intensity. In contrast, the relative contribution of clay from the Pearl River decreased from similar to 40% during the LGM, to similar to 5% when the sea level reached similar to 70 m below its present position. The Pearl River contribution has remained consistently low throughout the Holocene, indicating that shore-parallel circulation patterns on the shelf resembled their present configuration by 13 ka. Compared to Taiwan and the Pearl River, the proportion of clay derived from the area east of Pearl River (EPR) was relatively minor, and less variable. A local peak in the relative contribution from this area occurred during a Melt Water Pulse Event (MWP-1A), suggesting that a reservoir of smectite-rich clays residing in coastal bays was remobilized by this marine transgression. Spectral analysis of the relative contributions of the three major clay sources revealed a significant periodicity of similar to 380 years, which may reflect changes in solar insolation modulating the flux of clay minerals from Taiwan and the Pearl River to the deposition site on a centennial scale. (C) 2016 Elsevier B.V. All rights reserved.
部门归属[Liu, Jianguo; Xiang, Rong] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China; [Kao, S. -J.] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China; [Fu, Shaoying] Guangzhou Marine Geol Survey, Guangzhou 510075, Guangdong, Peoples R China; [Zhou, Liping] Peking Univ, Coll Urban & Environm Sci, MOE Key Lab Earth Surface Proc, Beijing 100871, Peoples R China ; 边缘海地质
关键词Provenance Taiwan Pearl River Monsoon Deglacial Holocene
学科领域Physical Geography ; Geology ; Paleontology
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15434
专题中科院边缘海地质重点实验室
通讯作者Liu, JG (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
推荐引用方式
GB/T 7714
Liu, Jianguo,Xiang, Rong,Kao, S. -J.,et al. Sedimentary responses to sea-level rise and Kuroshio Current intrusion since the Last Glacial Maximum: Grain size and clay mineral evidence from the northern South China Sea slope[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2016,450:111-121.
APA Liu, Jianguo,Xiang, Rong,Kao, S. -J.,Fu, Shaoying,Zhou, Liping,&Liu, JG .(2016).Sedimentary responses to sea-level rise and Kuroshio Current intrusion since the Last Glacial Maximum: Grain size and clay mineral evidence from the northern South China Sea slope.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,450,111-121.
MLA Liu, Jianguo,et al."Sedimentary responses to sea-level rise and Kuroshio Current intrusion since the Last Glacial Maximum: Grain size and clay mineral evidence from the northern South China Sea slope".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 450(2016):111-121.
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