| 湄公河三角洲第四系沉积物地球化学特征及其地质意义 |
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| 引用本文： | 杨允柳,何云龙,解习农,裴健翔,Hoang Dinh Tuan,张道军.湄公河三角洲第四系沉积物地球化学特征及其地质意义[J].地球科学,2022,47(3):1107-1121. |
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| 作者姓名： | 杨允柳 何云龙 解习农 裴健翔 Hoang Dinh Tuan 张道军 |
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| 作者单位： | 1.中国地质大学海洋地质资源湖北省重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目(Nos.42130408,42172125,41502102)； |
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| 摘 要： | 湄公河三角洲是由发源于青藏高原的世界第7长河——湄公河于南海西南部入海口处沉积而成.由于缺少可靠的地球化学资料和系统研究,湄公河三角洲地区第四系沉积物源性质尚不明确,制约了对湄公河三角洲源汇系统的进一步认识.本文对湄公河三角洲第四系沉积物进行了重矿物、主量元素和微量元素的地球化学特征分析,结果表明:所有样品稀土元素球粒...
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| 关 键 词： | 物源 地球化学 第四系 湄公河三角洲 |
| 收稿时间： | 2021-07-28 |
Geochemical Characteristics and Geological Significance of Quaternary Sediments in the Mekong Delta |
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| Abstract: | 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. |
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