作　　者： (张建军）; (牟传龙）; (周恳恳）; (伍皓）; (陈小炜）; (夏彧）;

机构地区： 中国地质科学院,北京100037 中国地质大学（北京）,北京100083

出　　处： 《矿物岩石地球化学通报》 2017年第4期574-581,共8页

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。 The sandstone-type uranium deposits were recently discovered in the Mangbang Formation,Husa basin,western Yunnan. In order to constrain the provenance and source weathering characteristics,Major,trace and rare earth elements of samples from the Mangbang Formation were examined. Geochemical compositions of mudstone from the Mangbang Formation show that they have not significantly affected by diagenesis so that the information about provenance and source weathering process was mostly retained in mudstones. The provenance of the Mangbang Formation mudstone is mainly Yanshanian granites with minor contribution of the Gaoligong Group metamorphic rocks. The Mangbang Formation mudstone were produced by rapidly sedimentation of mature crustal components under the active tectonic environment. The source of the third member of the Mangbang Foramtion has experienced strong chemical weathering,indicative of a warm and wet paleoenvironment.

关 键 词： 滇西地区 户撒盆地 物源 化学风化作用 古气候