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地质论评  2007 

高喜马拉雅康布马曲和波曲河流放射成因^87Sr源岩追踪研究

Keywords: 青藏高原高喜马拉雅河流87Sr

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Abstract:

虽然喜马拉雅河流Sr同位素对现代海洋Sr同位素产生了重要影响,但国际上目前对有关喜马拉雅河流Sr同位素异常源岩(如放射成因87Sr的来源)的认识仍存在着较大争议。为此,笔者等对高喜马拉雅河流波曲和康布马曲在中国境内河水主要离子化学和Sr同位素进行了分析研究,对河流放射性87Sr的来源进行了追踪研究。笔者等的研究数据表明,高喜马拉雅康布马曲和波曲河流主要离子水化学主要是受硅酸盐岩风化的影响。青藏高原河流河水TDS和HCO3-主要受岩性控制,片麻岩和花岗岩区河流TDS〈100(mg/L)、HCO3-〈60(mg/L),沉积岩区河流TDS〉100(mg/L)、HCO3-〉60(mg/L),除受蒸发盐岩和地下卤水影响的河流外,河水中HCO3-与TDS成正比,但河水中Si与TDS的关系并不明显。高喜马拉雅河流具有高n(87Sr)/n(86Sr)、低Sr的特征,河流Sr是主要来自于中央结晶岩系硅酸盐岩片麻岩和花岗岩的风化,而片麻岩和花岗岩中具有高n(87Sr)/n(86Sr)、低Sr特征的黑云母的风化应是河流放射成因87Sr的主要来源。

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