Ge/Si ratios indicating hydrothermal and sulfide weathering input to rivers of the Eastern Tibetan Plateau and Mt. Baekdu
Ge/Si ratios indicating hydrothermal and sulfide weathering input to rivers of the Eastern Tibetan Plateau and Mt. Baekdu
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DOI：
10.1016/j.chemgeo.2015.06.001
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发表时间：
2015-09
期刊：
影响因子：
3.9
通讯作者：
Yeongcheol Han;Y. Huh;L. Derry
中科院分区：
文献类型：
--
作者：
Yeongcheol Han;Y. Huh;L. Derry
河流沃茨中溶解硅的浓度反映了原生硅酸盐矿物的化学风化、次生粘土矿物的形成和风化、水热输入和生物循环（蛋白石植硅体的形成和溶解以及硅藻的生长）之间复杂的相互作用。我们应用Ge/Si比值来评估来自青藏高原东部的河流中溶解硅的不同来源-萨尔温江，湄公河，长江（长江），红（红）和黄河（黄）和从山。白头山-杜曼。在萨尔温江、长江和天山等地热活动高的干旱地区，河流Ge/Si比值升高。白河溪流。在黄河和洪江流域地热的影响并不明显，但风化的硫化物和含煤矿物可能是负责高Ge/Si比。在河流中，从热液和硫化物风化的输入是最小的，我们的数据大多落在高河流Si浓度和低Ge/Si比的风化限制制度。
Concentrations of dissolved silicon in river waters reflect a complex interplay among chemical weathering of primary silicate minerals, formation and weathering of secondary clay minerals, hydrothermal input and biological cycling (formation and dissolution of opal phytoliths and growth of diatoms). We applied the Ge/Si ratio to assess the different sources of dissolved Si in rivers hailing from the eastern Tibetan Plateau — the Salween, Mekong, Chang Jiang (Yangtze), Hong (Red) and Huang He (Yellow) and from Mt. Baekdu — the Duman. Elevated riverine Ge/Si ratios were observed in arid regions with high geothermal activity in the Salween, Chang Jiang and Mt. Baekdu streams. In the Huang He and Hong River basins geothermal influence was not as pronounced, but weathering of sulfide- and coal-bearing minerals may be responsible for the high Ge/Si ratios. In rivers where inputs from hydrothermal and sulfide weathering are minimal, our data mostly fall in the weathering-limited regime of high riverine Si concentrations and low Ge/Si ratios.