西藏地球化学填图及其意义

发布时间：2018-04-02 12:29

本文选题：地球化学　切入点：填图　出处：《地质论评》2017年02期

【摘要】：本文介绍谢学锦先生快速进行区域地球化学填图的计划在西藏取得的成果。区域水化学填图可分析66个指标,效率高,成本低,见效快;同时水化学填图的空间定位和分辨率比采集土壤样品的填图会差一些。西藏地球化学填图成果呈现了一定的规律性,例如西藏66种元素的地球化学图中,有三分之二沿雅鲁藏布江缝合带出现异常带。西藏许多元素的分布受雅鲁藏布江缝合带影响,是因为特提斯洋原有的一些元素残留在雅鲁藏布江缝合带两侧。氧化钾、氧化钠沿雅鲁藏布江缝合地带出现含量高的异常带,可见特提斯洋中丰富的钾、钠成分残留在代表大洋封闭的雅鲁藏布江缝合带两侧。沿雅鲁藏布江缝合地带氧化钙出现含量低的异常带,可用特提斯洋中的碳汇作用来解释,即特提斯洋中的钙由于碳汇作用变成碳酸盐岩石,氧化钙出现含量低的异常。西藏的地球化学图对矿产勘查和生态环境研究也具有一定意义。
[Abstract]:This paper presents the achievements of Mr. Xie Xuejin's plan for rapid regional geochemical mapping in Tibet.The regional hydrochemical mapping can analyze 66 indexes with high efficiency, low cost and quick effect, at the same time, the spatial location and resolution of hydrochemical mapping are worse than those of soil samples.The geochemical mapping results of Tibet show certain regularity. For example, out of 66 geochemical maps of elements in Tibet, 2/3 have abnormal zones along the Yalu Zangbo River suture zone.The distribution of many elements in Tibet is affected by the Brahmaputra suture zone because some of the original elements of the Tethys Ocean remain on both sides of the Yarlung Zangbo suture zone.The anomalous zone with high content appears along the suture zone of the Brahmaputra River. The rich potassium in the Tethys Ocean is visible, and the sodium component remains on both sides of the Yarlung Zangbo suture belt, which represents the closure of the ocean.The anomalous zone of low content of calcium oxide along the suture zone of the Yarlung Zangbo River can be explained by the carbon sequestration in the Tethys Ocean, that is, the calcium in the Tethys Ocean becomes carbonate rock due to carbon sequestration, and the anomaly of low content of calcium oxide appears in the suture area of the Yarlung Zangbo River.The geochemical map of Tibet is also of significance for mineral exploration and ecological environment research.
【作者单位】：浙江大学地球科学学院;中国地质科学院地球物理地球化学勘查研究所;
【基金】：国家自然科学基金资助项目(编号:41574111)的成果
【分类号】：P632

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