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首页> 外文期刊>Journal of Asian earth sciences >Sediment distribution and provenance on the continental shelf off the Mekong River, SE Vietnam: Insights from heavy mineral analysis
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Sediment distribution and provenance on the continental shelf off the Mekong River, SE Vietnam: Insights from heavy mineral analysis

机译：湄公河大陆架的沉积物分布与出差，SE越南：重型矿物分析见解

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摘要

The continental shelf off southern Vietnam is relatively well studied regarding the dominant transport paths of bulk and fine-grained sediments discharged by the Mekong River. Thus, this region is particularly suitable for testing the applicability of heavy mineral analysis in determining the extent and origin of the sandy fraction of continental shelf deposits supplied mainly by a large river and their distribution over the adjacent extensive shelf. The fine sand fraction of 105 sediment samples from the Mekong River Delta and neighbouring continental shelf is investigated, applying two approaches: i) considering only the transparent non-micaceous mineral assemblage and ii) considering all the identified heavy minerals. The geological complexity of the source areas and local dominance of micaceous and non-transparent heavy minerals require the inclusion of all heavy mineral components when interpreting sediment provenance and dominant transport paths. The most diagnostic heavy minerals, amphibole, chlorite, epidote, limonite, opaques, tourmaline and zircon, are used for this purpose. The investigated continental shelf can be divided into two main regions characterised by various heavy mineral assemblages, namely, SW and NE off the Mekong River Delta. The south-western region is dominated by chlorite and limonite, indicating prevailing southward sediment transport from the Mekong River, whereas the north-eastern region is characterised by amphibole, epidote, opaques, tourmaline and zircon, indicating various sources from SE Vietnam and relict sediments partly covering the continental shelf. Between the two main regions, a large mixing zone is found where sediments from all sources are present, including Mekong River sediments transported eastward.
机译：越南南部的大陆架在湄公河排出的散装和细粒度沉积物的主导运输路径上相对良好。因此，该区域特别适用于测试重型矿物分析在确定主要由大型河流的大陆储存的砂质沉积物的范围和起源以及它们在相邻的广泛架子上的分布。研究了来自湄公河三角洲和邻近的大陆架的105个沉积物样品的细砂分数，应用了两种方法：i）仅考虑透明的非云母矿物组合和II）考虑所有已识别的重型矿物质。云碱和非透明重质矿物质的源区和局部优势的地质复杂性需要在解释沉积物来源和显性运输路径时包含所有重型矿物组分。最诊断的重型矿物质，锥形，氯酸盐，蛇类动物，褐铁矿，不错，电气石和锆石，用于此目的。调查的大陆架可分为两个主要区域，其特征在于各种重型矿物组合，即湄公河三角洲的SW和NE。西南部地区以氯化物和褐铁矿为主，表明湄公河的南方沉积物运输，而东北地区的特点是锥形，潮流，渗透率，陀螺仪和锆石，表明来自SE越南的各种来源和遗留沉积物部分覆盖大陆架。在两个主要区域之间，发现一个大的混合区，存在来自所有来源的沉积物，包括湄公河沉积物向东运输。

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