The geochemical behavior of Cu and its isotopes in the Yangtze River
作者： Qian Wang , Lian Zhou , Susan H. Little , Jinhua Liu , Lanping Feng
DOI: 10.1016/J.SCITOTENV.2020.138428
关键词:
摘要: Copper (Cu) isotopes can be a useful tool to constrain the interaction of water and environment, but they have not been widely applied riverine research in preceding decades. Isotopically heavy Cu rivers (global average: about +0.7‰) compared rocks (at 0‰) has attributed to: a) mobilization during oxidative weathering, b) partitioning between an isotopically heavy, organically complexed dissolved pool, light pool adsorbed particulates. Here, we report concentrations isotope ratios main stream Yangtze River its several tributaries. We find that exhibits anomalously compositions other rivers: δ65CuNIST 976 for stream, from Chongqing Nanjing, ranges +0.59 +1.65‰, while tributaries vary +0.48 +1.20‰. A negative correlation is observed compositions. attribute anomalous geochemistry two key features basin: first, influence Three Gorges Dam (TGD), second, presence extensive sulphide deposits close lower reaches river. In upper reaches, downstream towards TGD, δ65Cu values increase as decrease, reflecting preferential adsorption by sedimenting particulate phases. continue maximum +1.65‰ middle at Guangxingzhou. The Jiujiang Tongling, are characterized less positive +0.60‰), due weathering deposits. overall Cu-δ65Cu trend river reflects mixing these waters influenced sulphides, with upstream, which elevated values.
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