黔西南包谷地金矿区构造控矿特征及找矿预测  

Ore-controlling structure and prospecting prediction of Baogudi gold mining areain Southwest Guizhou

作　　者：陈发恩[1] 刘建中[2,3] 谭礼金 蒙明华 王泽鹏 王大福[1] 万大学 CHEN Fa′en;LIU Jianzhong;TAN Lijin;MENG Minghua;WANG Zepeng;WANG Dafu;WAN Daxue(Geological Brigade No.105,Guizhou Provincial Bureau of Geology and Mineral Exploration and Development,Guiyang 550018,Guizhou,China;Guizhou Provincial Bureau of Geology and Mineral Exploration and Development,Guiyang 550004,Guizhou,China;Engineering Technology Innovation Center for Mineral Resources Exploration in Bedrock Zones,Ministry of Natural Resources,Guiyang 550081,Guizhou,China)

机构地区：[1]贵州省地质矿产勘查开发局一○五地质大队,贵州贵阳550018 [2]贵州省地质矿产勘查开发局,贵州贵阳550004 [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550081

出　　处：《矿产与地质》2020年第4期673-681,共9页Mineral Resources and Geology

基　　金：国家自然科学基金联合项目(U1812405);国家重点研发计划“深地资源勘查开采”专项(2017YFC0601500)共同资助。

摘　　要：包谷地金矿区主体构造为近EW向包谷地箱状复式背斜,由铁厂坳、沟头、轿子山、安者、包谷地、猴子坡等金矿点构成,矿体集中产于上二叠统龙潭组中下部次级背斜核部、高角度逆冲断裂带、断裂牵引膝折带及构造蚀变体中,构造分级控矿特征明显,包谷地箱状复式背斜控制金矿区的分布范围,次级大垭口、包谷地、云顶、马古地等背斜控制金矿化带的展布,次级背斜核部、高角度逆冲断裂、断裂牵引膝折带及构造蚀变体是金矿体就位空间。通过地质矿产资料综合研究,建立包谷地背斜找矿地质模型,进行深部找矿预测,认为包谷地金矿区中矿段是实现找矿突破较好地段,目前只发现露头矿,深部找矿潜力大,东矿段未出露,西矿段矿体发现零星矿体,依据区内构造变形、蚀变矿化具有靠近茅口组增强、远离茅口组减弱的特征点,深部隐伏低级别褶皱、断裂及构造蚀变体存在,具有较好的找矿潜力。The main structure of Baogudi gold mining area is a box-like compplex anticline near EW,in where there are several gold mineralization segments such as Tiechang'ao,Goutou,Jiaozishan,Anzhe,Baogudi and Houzipo ore occurrences.The ore bodies are concentrated in the middle and lower secondary anticline cores of the Upper Triassic Longtan Formation(P 3 l),the high-angle thrust fault zone,the traction knee break zone and the structural alteration body,which are obviously controlled by the hierarchical structures.The Baogudi box-shaped compplex anticline has controlled the distribution range of the whole gold ore field,The distribution of gold mineralization belts is controlled by the secondary anticlines such as Dayakou,Baogudi,Yunding and Magudi ones.The core of secondary anticlines,high-angle thrust faults,fracture traction knee folds and structural alteration body are the hosted space for the gold orebodies.Through a comprehensive study of geological data and mineral resources,an ore prospecting model is established in the Baogudi anticline in order to make further prospecting prediction.It is considered that the middle ore section of the Baogudi gold mining area is the better place for a great prospecting breakthrough.Currently there are only ore outcrops in the surface,and there is a great potential for the deep prospecting.The east section is not exposed,and there are sporadic ore bodies in the west section.According to the structural deformation,alteration and mineralization in the area,there are the features of strengthening near the Maokou Formation(P 2 m)and weakening away from the Maokou Formation,and in the deep place there are concealed and low-level folds,faults and structural alteration.It is shown that there is a good prospecting potential in the area.

关 键 词：包谷地金矿区 构造控矿 深部找矿预测 黔西南 

分 类 号：P618.51[天文地球—矿床学]