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首页> 外文期刊>Journal of Asian earth sciences >Sedimentary processes on the Mekong subaqueous delta: Clay mineral and geochemical analysis
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Sedimentary processes on the Mekong subaqueous delta: Clay mineral and geochemical analysis

机译：湄公河水下三角洲的沉积过程：粘土矿物和地球化学分析

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摘要

Sedimentary processes on the inner Mekong Shelf were investigated by examining the characteristics of sediments sampled in gravity cores at 15 locations, including grain size, clay mineralogy, sediment accumulation rates, and the elemental and stable carbon isotopic composition of organic matter (atomic C/N ratios and δ~(13)C). Deltaic deposits exhibit contrasting characteristics along different sides of the delta plain (South China Sea, SCS hereafter, to the east and Gulf of Thailand, GOT hereafter, to the west) as well as on and off the subaqueous deltaic system. On one hand, cores recovered from the subaqueous delta in the SCS/GOT are consisted of poorly/well sorted sediments with similar/different clay mineral assemblage with/from Mekong sediments. Excess ~(210)Pb profiles, supported by ~(14)C chronologies, indicate either "non-steady" (SCS side) or "rapid accumulation" (GOT side) processes on the subaqueous delta. The δ~(13)C and C/N ratio indicate a mixture of terrestrial and marine-sourced organic matter in the deltaic sediment. On the other hand, cores recovered from areas with no deltaic deposits or seaward of the subaqueous delta show excess ~(210)Pb profiles indicating "steady-state" accumulation with a greater proportion of marine-sourced organic matter. Core analysis's relevance with local depositional environment and previous acoustic profiling are discussed.
机译：通过检查15个位置重力岩心中的沉积物特征，研究了湄公河内层架的沉积过程，包括颗粒大小，粘土矿物学，沉积物积累速率以及有机质的元素和稳定碳同位素组成（原子C / N比率和δ〜（13）C）。三角洲沉积物在三角洲平原的不同面（以下称南中国海，以下称南海，至东部和泰国湾，以下称GOT，西下）以及水下三角洲系统内外表现出鲜明的特征。一方面，从SCS / GOT的水下三角洲回收的岩心是由分类不佳/分类良好的沉积物组成的，这些沉积物具有类似/不同的黏土矿物组合和/或来自湄公河沉积物。 〜（14）C时序支持的〜（210）Pb过量剖面表示在水下三角洲上的“不稳定”（SCS侧）或“快速积累”（GOT侧）过程。 δ〜（13）C和C / N比表示三角洲沉积物中陆地和海洋来源的有机物的混合物。另一方面，从没有三角洲沉积物或水下三角洲的海域采出的岩心显示出过量的〜（210）Pb剖面，表明“稳态”蓄积且海洋来源的有机物比例更大。讨论了岩心分析与局部沉积环境和先前的声波廓线的相关性。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第ptaa期|520-528|共9页
  • 作者

    Zuo Xue; J. Paul Liu; Dave DeMaster; Elana L. Leithold; Shiming Wan; Qian Ge; Van Lap Nguyen; Thi Kim Oanh Ta;

  • 作者单位

    Department of Marine, Earth and Atmospheric Sciences. North Carolina State University, Raleigh, NC 27695, USA;

    Department of Marine, Earth and Atmospheric Sciences. North Carolina State University, Raleigh, NC 27695, USA;

    Department of Marine, Earth and Atmospheric Sciences. North Carolina State University, Raleigh, NC 27695, USA;

    Department of Marine, Earth and Atmospheric Sciences. North Carolina State University, Raleigh, NC 27695, USA;

    Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;

    HCMC Institute of Resources Geography, VAST, 1 Mac Dinh Chi St., 1 Dist.. Ho Chi Minh City, Vietnam;

    HCMC Institute of Resources Geography, VAST, 1 Mac Dinh Chi St., 1 Dist.. Ho Chi Minh City, Vietnam;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    South China Sea; Mekong River Delta; Clay mineralogy; Organic carbon; Depositional environment;

    机译：南中国海;湄公河三角洲;粘土矿物学;有机碳沉积环境;

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