贵州碧江广龙坡铅锌矿控矿因素及矿化富集规律

Ore-controlling factor and mineralization enrichment regularity of Guanglongpo lead-zinc deposit in Bijiang District of Tongren City,Guizhou

广龙坡铅锌矿是湘黔铅锌矿成矿带上的一个典型MVT型矿床,本文在总结矿床地质特征的基础上,结合深部钻探资料对比,从构造、地层、岩性及岩相控矿等方面对广龙坡铅锌矿的矿化富集规律进行研究。结果表明,矿床赋存于寒武系第二统清虚洞组中第二段地层中,矿体呈似层状与地层整合产出,构造、地层、岩性及岩相是重要的控矿因素,含矿层顶面褶皱对矿化有控制作用,宽缓的次级背斜对成矿有利,矿化严格受层位控制,产于碳酸盐岩中。矿化富集与岩相有关,特别是与藻丘相的分布关系密切,含矿地层总厚度越大,对成矿越有利。

Guanglongpo Pb-Zn deposit is a typical MVT deposit in the Hunan-Guizhou Pb-Zn metallogenic belt.On the basis of summary of the geological characteristics of the deposit,Combined with deep drilling data comparison,the mineralization enrichment regularity of Guanglongpo lead-zinc deposit is studied from the aspects of structure,strata,lithology and lithofacies controlling factor.The result shows that the deposit is hostedat the second member of Qingxudong Formation of the Second Cambrian Series.The ore body is stratified and integrated with the strata.Structure,strata,lithology and lithofacies are the important ore-controlling factors.Mineralization is controlled by the fold of the top surface of ore-bearing layer.Wide and gentle secondary anticlines are favorable for the mineralization.Mineralization is strictly controlled by the strata,Found in carbonate rocks,Mineralization enrichment is also related to lithofacies,especially closely related to the distribution of algal dome facies.The greater the total thickness of ore-bearing strata,the more favorable it is for mineralization.The research result can provide a reference for the prospecting and exploration of the same type of lead-zinc deposit in the metallogenic belt of Hunan-Guizhou lead-zinc deposit.