Detrital fine-grained sediment contribution from Taiwan to the northern South China Sea and its relation to regional ocean circulation
Detrital fine-grained sediment contribution from Taiwan to the northern South China Sea and its relation to regional ocean circulation
复制标题
台湾碎屑细粒沉积物对南海北部的贡献及其与区域海洋环流的关系
DOI：
10.1016/j.margeo.2008.08.003
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发表时间：
2008-12-05
期刊：
影响因子：
2.9
通讯作者：
Chen, Zhong
中科院分区：
文献类型：
--
作者：
Liu, Zhifei;Tuo, Shouting;Chen, Zhong
根据台湾西南部主要河流和湖泊及南海东北部台湾外海海底140个样品的粘土矿物学研究结果，结合珠江流域、吕宋河流域及华南陆棚和陆坡的粘土矿物记录，半定量地评价了台湾碎屑细颗粒沉积物对南海北方的贡献。台湾沉积物的粘土矿物组合主要由伊利石（平均56%）和蒙脱石（41%）组成，高岭石和蒙皂石非常稀少。它们各自的分布从河流和湖泊到台湾外海的海底并没有表现出明显的流域性差异。伊利石化学指标与伊利石结晶度、伊利石结晶度与高岭石（%）的线性相关关系表明，华南陆棚和陆坡的两个物源端员为珠江和台湾。假设南海北方高岭石完全由珠江提供，则台湾对华南陆棚和华南陆坡的贡献分别为29%和23%。据此，珠江对华南陆架和陆坡的贡献分别为52%和31%。吕宋岛弧主要通过提供蒙皂石来提供南海北方的粘土矿物组分。北太平洋深层水向南的巴士海峡分支和西太平洋表层黑潮向北的分支可以将台湾来源的悬浮物向西输送到南海北方。(C)2008 Elsevier B. V.保留所有权利。
Results of clay mineralogy in 140 samples collected in major rivers and lakes in southwestern Taiwan and on the seafloor off Taiwan in the northeastern South China Sea (SCS), combined with clay mineral records of the Pearl River drainage basin, rivers in Luzon, and the South China shelf and slope, are used to semi-quantitatively evaluate the detrital fine-grained sediment contribution of Taiwan to the northern SCS. The clay mineral assemblage of the Taiwan-sourced sediments consists dominantly of illite (average 56%) and chlorite (41%), with very scarce kaolinite and smectite. Their respective distribution from the rivers and lakes to the seafloor off Taiwan does not show obvious basin-wide differences. Linear correlations of illite chemistry index with illite crystallinity and of illite crystallinity with kaolinite (%) present two end-members of provenances, the Pearl River and Taiwan, for the South China shelf and slope. Assuming that kaolinite in the northern SCS is provided completely from the Pearl River, the contribution of Taiwan in clay minerals is evaluated as 29% to the South China shelf and 23% to the South China slope, respectively. Accordingly, the contribution of the Pearl River to the South China shelf and slope is 52% and 31 %, respectively. The Luzon Arc accounts for the rest of clay mineral components for the northern SCS mainly by providing smectite. The Bashi Strait-crossed branches of the southward deep North Pacific Deep Water and the northward Surface Kuroshio Current in the western Pacific may transport Taiwan-sourced Suspended sediments westwards to the northern SCS. (C) 2008 Elsevier B.V. All rights reserved.