| 南海台西南盆地南部海域19 ka以来沉积物物源与输运机制分析 |
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| 引用本文： | 唐荣,冯秀丽,冯利,肖晓,刘爽.南海台西南盆地南部海域19 ka以来沉积物物源与输运机制分析[J].海洋学报,2021,43(8):54-65. |
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| 作者姓名： | 唐荣 冯秀丽 冯利 肖晓 刘爽 |
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| 作者单位： | 1.中国地震局第一监测中心，天津 300180 |
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| 基金项目： | 国家重点研发计划（2017YFC0306703）；中国地震局第一监测中心科技创新主任基金（FMC2020003）。 |
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| 摘 要： | 通过对南海台西南盆地南部海域TS6岩芯沉积物样品稀土元素地球化学特征和黏土矿物组合进行分析，探讨了研究区近19 ka (末次冰消期)以来沉积物物质来源、输运机制及物源变化特征。物源综合分析结果显示，台湾河流是研究区沉积物的主要源区，其中台湾西部河流较东部河流贡献更大，珠江也为研究区输送了部分沉积物。由于各源区物质主要黏土矿物种类及含量存在较大差异，推测研究区沉积物黏土矿物中的伊利石和绿泥石主要由台湾河流提供，高岭石主要由珠江提供，含量较少的蒙脱石由东南部的吕宋岛提供。末次冰消期以来，研究区陆源物质输入量受控于海平面变化而逐渐减少，黏土矿物组合反映的物源变化主要受控于气候和洋流变化，还可能叠加了多种因素的影响。
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| 关 键 词： | 台西南盆地 末次冰消期 物源 输运机制 陆源输入量 |
| 收稿时间： | 2020-09-01 |
Analysis on the provenance and transport mechanism of sediments in the southern area of Southwest Taiwan Basin,South China Sea over the last 19 ka |
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| Affiliation: | 1.The First Monitoring and Application Center, China Earthquake Administration, Tianjing 300180, China2.College of Marine Geosciences, Ocean University of China, Qingdao 266100, China3.Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China |
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| Abstract: | Based on the analysis of the rare earth element (REE) geochemical characteristics and clay mineral assemblages of Core TS6 sediment samples in the southern area of Southwest Taiwan Basin, South China Sea, the provenance and characteristics of its changes, material transport mechanism of sediments in the study area over the last 19 ka (the last deglaciation) are discussed. The comprehensive analysis of provenance shows that the rivers in Taiwan are the main provenance of sediments in the study area. The rivers in the west of Taiwan contribute more than the rivers in the east, and the Zhujiang River also transports part of sediments to the study area. Due to the large differences on the types and contents of the main clay minerals in different provenance areas, it is judged that the illite and chlorite of the clay minerals in the study area are mainly provided by the rivers in Taiwan; the kaolinite is mainly provided by the Zhujiang River and the less content of montmorillonite is provided by Luzon Island in the southeast. Since the last deglacial period, the input of terrigenous materials in the study area has been gradually reduced under the control of sea level changes. The provenance changes reflected by the combination of clay minerals are mainly controlled by changes in climate and ocean currents, and the influence of multiple factors may be superimposed. |
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