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Chemical weathering processes in the Yalong River draining the eastern Tibetan Plateau, China

机译：青藏高原东部流域的雅long江化学风化过程

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摘要

To better understand chemical weathering and controlling processes in the Yalong River of the eastern Tibetan Plateau, this study presents major ion concentrations and stable isotopes of the dissolved loads. The isotopic compositions (δ~(13)C-DIC, δ~(34)S and δ~(18)O-SO_4) of the dissolved loads are very useful to quantify solute sources and define the carbon budget related with chemical weathering in riverine systems. The isotopic composition of sulphate demonstrates that most of the sulphate is derived from sulphide oxidation, particularly in the upper reach of the Yalong River. The correlations between δ~(13)C-DIC, water chemistry and isotopes of sulphate, suggest that the carbon dynamics are mainly affected by carbonate weathering by sulphuric acid and equilibration processes. Approximately 13% of the dissolved inorganic carbon in the Yalong River originates from carbonate weathering by strong acid. The CO_2 consumption rates are estimated to be 2.8 × 10~5 mol/km~2/yr and 0.9 × 10~5mol/km~2/yr via carbonate and silicate weathering in the Yalong River, respectively. In this study, the influence of sulphide oxidation and meta-morphic CO_2 on the carbon budget is estimated for the Yalong River draining the eastern Tibetan Plateau.
机译：为了更好地了解青藏高原东部雅long江的化学风化和控制过程，本研究提出了溶解负荷的主要离子浓度和稳定同位素。溶解负荷的同位素组成（δ〜（13）C-DIC，δ〜（34）S和δ〜（18）O-SO_4）对于定量溶质来源和确定与化学风化有关的碳收支非常有用。河流系统。硫酸盐的同位素组成表明，大部分硫酸盐均来自硫化物氧化，特别是在亚龙河上游。 δ〜（13）C-DIC，水化学与硫酸盐同位素之间的相关性表明，碳动力学主要受硫酸盐碳酸盐风化和平衡过程的影响。亚龙河中约13％的溶解无机碳来自强酸对碳酸盐的风化作用。通过雅long江的碳酸盐和硅酸盐风化作用，估计CO_2消耗率分别为2.8×10〜5 mol / km〜2 / yr和0.9×10〜5mol / km〜2 / yr。在这项研究中，估计了青藏高原东部流域的雅long江的硫化物氧化和变质态的CO_2对碳收支的影响。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|74-84|共11页
  • 作者

    Si-Liang Li; Benjamin Chetelat; Fujun Yue; Zhiqi Zhao; Cong-Qiang Liu;

  • 作者单位

    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cuiyang 550002, China;

    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cuiyang 550002, China;

    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cuiyang 550002, China;

    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cuiyang 550002, China;

    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Cuiyang 550002, China;

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  • 正文语种 eng
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  • 关键词

    Dual isotopes of sulphate; δ~(13)C-DIC; Hot spring; Weathering processes; Eastern Himalaya;

    机译：硫酸盐的双重同位素;δ〜（13）C-DIC;温泉;风化过程;喜马拉雅东部;

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