夹皮沟金成矿带成矿模式讨论  

Discussion on metallogenic model of Jiapigou gold metallogenic belt

作　　者：臧兴运[1] 姜建军[2] 李德洪[1] 赵华伟[1] 靳皇玉 马春生[1] ZANG Xing-yun;JIANG Jian-jun;LI De-hong;ZHAO Hua-wei;JIN Huang-yu;MA Chun-sheng(Institute of Geological Survey of Jilin Province,Changchun 130102,Jilin,China;Bureau of Non-ferrous Metals Geological Exploration of Jilin Province,Changchun 130021,Jilin,China)

机构地区：[1]吉林省地质调查院,吉林长春130102 [2]吉林省有色金属地质勘查局,吉林长春130021

出　　处：《吉林地质》2020年第3期1-14,28,共15页Jilin Geology

基　　金：中国地质调查局项目(DD20160346)资助。

摘　　要：运用大型剪切带控矿理论,对夹皮沟成矿带成矿机制进行了分析。研究表明,夹皮沟成矿带具有多期次、多成因的成矿作用:矿源层(表壳岩)形成于中太古代至新太古代早中期(约3000~2600 Ma),第一次成矿作用为新太古代末(约2500 Ma),成矿机制为区域变质;第二次成矿作用为古元古代中晚期(约1900~1800 Ma),成矿机制为区域变质+岩浆作用;第三次成矿作用为晚三叠世至中侏罗世早期(约230~170 Ma),成矿机制为岩浆作用。中侏罗世末至晚侏罗世初(约170~150 Ma)的差异性断块升降,是造成同一成矿带的各矿床(点),地质特征不完全相同的主要原因。受剪切带控制的矿床(点),由浅部至深部,矿石类型具有由石英脉型向构造蚀变岩型、片糜岩型依次转化的趋势。夹皮沟成矿带是表壳岩、岩浆岩、大砬子-夹皮沟断裂带相互作用、长期演化的结果,并与吉林省构造演化史相耦合。The ore-forming mechanism of the Jiapigou metallogenic belt is analyzed and studied using the theory of large-scale shear zone ore control.The research results show that the Jiapigou metallogenic belt has multi-stage and multi-genetic mineralization,and the ore source layer was formed from the middle Archean to the early and middle Neoarchean(about 3000~2600 Ma).The first mineralization was at the end of Neoarchean(about 2500 Ma),and the mineralization mechanism was regional metamorphism.The second mineralization was the middle and late of Paleoproterozoic(about 1900~1800 Ma),and the mineralization mechanism was regional metamorphism and superimposed magmatism.The third mineralization was from the late Triassic to the early middle Jurassic(about 230~170 Ma),and the mineralization mechanism was magmatism.The rise and fall of differential fault blocks from the end of the middle Jurassic to the beginning of the late Jurassic(approximately 170 Ma to 150 Ma)is the main reason for the different geological characteristics of the deposits(or ore spot)in the same metallogenic belt in the Jiapigou area.The deposits(or ore spot)controlled by the shear zone range from shallow to deep,and their mineralization types tend to transform from quartz vein type to tectonic altered rock type and schistite type.The Jiapigou metallogenic belt is the result of the interaction and long-term evolution of supracrustal rocks,magmatic rocks,and the Dalazi-Jiapigou fault zone,and is coupled with the tectonic evolution history of Jilin Province.

关 键 词：剪切带 表壳岩 区域变质 岩浆作用 成矿机制 夹皮沟成矿带 

分 类 号：P618.51[天文地球—矿床学]