Geochemical Characteristics and Geological Significance of Quaternary Sediments in the Mekong Delta

被引：0
|
作者：
Yang Y. [1 ]
He Y. [1 ,2 ]
Xie X. [1 ,2 ]
Pei J. [3 ]
Tuan H.D. [1 ]
Zhang D. [3 ]
机构：
[1] Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan
[2] Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan
[3] Zhanjiang Branch, CNOOC Limited, Zhanjiang
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 03期
关键词：
Geochemistry; Mekong River Delta; Provenance; Quaternary;
D O I：
10.3799/dqkx.2021.110
中图分类号：
学科分类号：
摘要：
Originating from Qinghai-Tibet Plateau, the Mekong River is seventh longest river of the world, forming the Mekong River Delta in southwestern South China Sea. Due to lack of reliable geochemical data and systematic research, the properties of Quaternary sediments in the Mekong Delta are still unclear, which restricts further understanding of the source and sink system of the Mekong River. Based on the analysis of heavy minerals, geochemical characteristics of major elements and trace elements of samples from Mekong Delta, all the samples present negative chondrite-normalized Eu anomaly, indicating typical terrigenous deposition. With respect to the Pleistocene samples, the ZTR index ranges between 21 and 69. By contrast, the ZTR index of the Holocene samples ranges from 2 to 13. The correlation diagrams show that the Holocene samples are mainly affected by sorting and the Pleistocene samples are mainly affected by sedimentary recycling. The provenance of sediments from the Pleistocene with high component maturity was probably derived from eastern part of the Tibet, which has experienced several depositional recycling and have been transported by Paleo-Mekong River to the Delta. However, with low component maturity, the sediments of the Holocene are proximal source, and most likely from basement of Dalat area nearby. Variation of provenance of Mekong River Delta during different depositional periods may be related to the tectonic activities, depositional processes and evolution of the Mekong River and the Mekong River Delta in Quaternary. © 2022, Editorial Department of Earth Science. All right reserved.
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页码：1107 / 1121
页数：14
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