青海北祁连西段岩金矿成矿地质条件及找矿方向

Analysis of metallogenic geological conditions and prospecting direction of rock gold deposits in the western part of North Qilian Mountains in Qinghai Province

在北祁连西段甘肃境内金矿找矿取得了巨大成果,但在青海境内,该成矿带上金矿找矿遇到了瓶颈。文章以青海境内已有的典型金矿陇孔、黑刺沟金矿床为基础,结合以往区内金矿研究成果。认为金矿体主要产于下奥陶统阴沟群火山岩组,受区域断裂及次级断裂控制明显,蛇绿混杂岩带内基性—超基性岩浆活动为金矿的富集提供了条件,韧性剪切带是主要的容矿构造。通过对研究区成矿地质条件及地球化学背景初步分析,提出了该区找矿方向。

Great achievements have been made in gold prospecting in Gansu Province in the western part of North Qilian Mountains.However,in Qinghai Province,gold prospecting in this metallogenic belt has encountered a bottleneck.Based on the existing longkong and Heicigou typical gold deposits in Qinghai Province,this paper combines with the previous research results of gold deposits in this area.It is considered that the gold ore bodies are mainly produced in the volcanic rock formation of the Ordovician yingou group,which is obviously controlled by regional faults and secondary controls.The basic and ultrabasic magmatism in the ophiolitic melange belt provides conditions for the enrichment of gold deposits,and the ductile shear zone is the main ore hosting structure.Based on the preliminary analysis of metallogenic geological conditions and geochemical background in the study area,the prospecting direction is put forward.