北祁连西段寒山金矿控矿构造及富集规律  

Ore-Controlling Structure and Enrichment Law of the Hanshan Gold Deposit in the Western Section of the North Qilian Mountains

作　　者：李生栋 李大民 杨永春 LI Shengdong;LI Damin;YANG Yongchun(Forth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources,Jiuquan,Gansu 735000)

机构地区：[1]甘肃省地质矿产勘查开发局第四地质矿产勘查院,甘肃酒泉735000

出　　处：《地质与勘探》2020年第4期675-687,共13页Geology and Exploration

摘　　要：寒山金矿床产于北祁连西段加里东褶皱带北缘,区内矿产资源丰富,加强其控矿构造及矿化富集规律研究,对矿区勘查意义重大。通过野外调查及室内研究,发现矿区内赋矿地层为奥陶系阴沟群火山碎屑岩。矿区内褶皱构造及韧-脆性剪切带发育,联合控制了矿体的分布。韧-脆性剪切带发育在褶皱两翼,受层滑剪切系统控制。矿体产在背斜转折端及两翼韧-脆性剪切带内,呈楔形产出,向下迅速尖灭。研究认为,矿体主要富集在韧-脆性剪切带发育部位,矿体的富集程度与蚀变带规模正相关,靠近背斜转折端的位置为矿体富集地段,多阶段成矿作用同部位叠加构成富矿体。The Hanshan gold deposit is located in the northern margin of the Caledonian fold belt,western section of the North Qilian Mountains,hosting abundant mineral resources.It is of great significance for exploration to further understand the ore-controlling structure and mineralization enrichment law in this area.Field geological investigations and theoretical studies suggest that the ore-bearing strata in the mining area are Ordovician Yingou Group pyroclastic rocks.Fold structure and ductile-brittle shear zones developed in the mining area,which jointly control the distribution of ore bodies.Ductile-brittle shear zones developed on both limbs of the fold,controlled by the layer-slip shear system.Ore bodies are present in the hinge zone of an anticline and the ductile-brittle shear zone of both fold limbs,which are wedge-shaped and rapidly pinch out downward.Research suggests that the ore body is mainly concentrated in locality with ductile-brittle shear zones,the enrichment degree of the ore body is positively correlated with the scale of the alteration zone,and the position near the hinge zone of the anticline is the section of ore body enrichment,and the multi-stage mineralization and superposition jointly created rich ore bodies.

关 键 词：韧-脆性剪切带 褶皱 富集规律 寒山金矿 北祁连 

分 类 号：P613[天文地球—矿床学]