滇西户撒盆地芒棒组第三段泥岩地球化学特征:物源及其风化作用

发布时间：2018-06-08 14:22

本文选题：滇西地区 + 户撒盆地　；参考：《矿物岩石地球化学通报》2017年04期

【摘要】：滇西地区户撒盆地芒棒组新近发现有砂岩型铀矿化。为了开展砂岩型铀矿的进一步找矿工作,对芒棒组第三段泥岩样品的主量元素、微量元素和稀土元素进行了测试分析,并对芒棒组的沉积物源及其风化作用特征进行了探讨。结果表明,户撒盆地芒棒组第三段泥岩组成较少受成岩作用影响,样品较完整的保存了物源和风化作用信息;芒棒组第三段碎屑沉积岩物源主要为周缘燕山期花岗岩,少量为高黎贡山群变质岩;芒棒组第三段碎屑沉积岩为活动构造环境下再循环沉积物的快速沉积产物,其源岩经历了强烈的化学风化作用,沉积期古气候总体为温暖、潮湿环境。
[Abstract]:Sandstone-type uranium mineralization has recently been discovered in the Mangwan formation of the Husa basin in western Yunnan. In order to carry out further prospecting for sandstone-type uranium deposits, the main elements, trace elements and rare earth elements of mudstone samples in the third member of the Manggang formation were tested and analyzed, and the sediment source and weathering characteristics of the Manggang formation were discussed. The results show that the mudstone composition of the third member of the Mangbang formation in the Husa basin is less affected by diagenesis, and the samples have completely preserved the information of provenance and weathering, and the third member of the Mangbang formation is mainly derived from the Yanshanian granites in the peripheral margin. A small amount of metamorphic rocks in the Gaoligongshan Group, the clastic sedimentary rocks of the third member of the Mangbang formation are the rapid depositional products of the recirculating sediments in the active tectonic environment, the source rocks have experienced strong chemical weathering, and the paleoclimate in the sedimentary period is generally warm. A wet environment.
【作者单位】：中国地质科学院;中国地质大学(北京);中国地质调查局成都地质调查中心;
【基金】：中国地质调查局地质调查项目(121201010000150006)
【分类号】：P588.22;P619.14

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