黔西南水银洞超大型金矿龙潭组赋矿层岩相特征及对金成矿的控制  

Lithofacies characteristics of the Longtan Formation and its control of gold mineralization in the Shuiyindong gold deposit,Southwestern Guizhou Province

作　　者：杨成富 刘建中[3,4] 顾雪祥 王泽鹏[2,3] 陈发恩[2,3] 王大福[2,3] 徐良易 李松涛[2,3] YANG Chengfu;LIU Jianzhong;GU Xuexiang;WANG Zepeng;CHEN Faen;WANG dafu;XU Liangyi;LI Songtao(School of Geosciences and Resource,China University of Geosciences(Beijing),Beijing 100083,China;No.105 Geological Party,Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,Guizhou,China;Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock,Ministry of Natural Resources,Guiyang 550001,Guizhou,China;Guizhou Bureau of Geology and Mineral Exploration and Development,Guiyang 550001,Guizhou,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]贵州省地质矿产勘查开发局一○五地质大队,贵州贵阳550018 [3]自然资源部基岩区矿产资源勘查工程技术创新中心,贵州贵阳550001 [4]贵州省地质矿产勘查开发局,贵州贵阳550001

出　　处：《地质通报》2020年第8期1221-1232,共12页Geological Bulletin of China

基　　金：国家重点研发计划项目课题《深部矿产资源三维找矿预测评价示范》(编号:2017YFC0601506);国家自然科学基金项目(批准号:U1812402);贵州省地质矿产勘查开发局地质科研项目(编号:黔地矿科合[2017]9号)。

摘　　要：黔西南地区水银洞超大型金矿床产于上二叠统龙潭组,金异常富集的高品位层状-似层状矿体受特定的不纯碳酸盐岩和有利岩性组合控制。对龙潭组赋矿层及围岩开展系统岩石学对比分析,总结制约龙潭组沉积作用及岩石类型的控制因素,分析龙潭组中高品位金矿体产出特征及其对岩性岩相的选择性规律。结果表明,龙潭组整体为一套浅水三角洲泥炭沼泽与滨岸潮坪泻湖相沉积,以富含有机质为特征,灰岩夹层可能代表不同时期的海侵事件;峨眉山玄武岩浆的喷溢改变吴家坪期沉积古地理格局和龙潭组中陆源碎屑岩的成分,发育与火山活动有关的沉积,矿石中铁白云石可能是火山碎屑物质热蚀变产物;富有机质和玄武质火山碎屑的不纯生物碎屑灰岩是金异常富集形成高品位矿体的重要控制因素。在黔西南地区找寻该类型矿床时应重点评价特定的岩石类型及组合特征。The Shuiyindong superlarge gold deposit,located in southwestern Guizhou Provence,has a high-grade layered orebody in the Upper Permian Longtan Formation(P 3 l).It is controlled by specific impure carbonate rocks and favorable lithology.In this paper,the authors summarized constraints on the sedimentary facies and rock characteristics of the Longtan Formation.Based on a detailed and systematic petrographic comparative analysis of the host rocks and wall rock,the authors hold that the Longtan Formation consists of a set of shallow-water delta peat bogs and coastal tidal flat lagoon sediments characterized by rich organic matter.Limestone interlayers in Longtan Formation may represent transgressive events of different periods.The Emeishan basalt magma eruption changed Wujiapingian epoch sedimentary paleogeographic pattern and composition of terrigenous clastic rocks in the formation of the Longtan Formation and developed sediments related to volcanic activity;iron dolomite in the ore might have been a thermal alteration product of volcanic clastic material;organic matter and basaltic volcanic fragments in impure bioclastic limestone was an important controlling factor for the abnormal enrichment of gold to form high-grade orebodies.When looking for this type of gold deposits in southwestern Guizhou Provence,researchers should focus on the evaluation of the favorable lithological unit.

关 键 词：岩性控矿 龙潭组 岩相 水银洞金矿 黔西南 

分 类 号：P618.51[天文地球—矿床学] P534.46[天文地球—地质学]