吉林和龙长仁铜镍矿区含矿橄榄辉石岩年代学及其地质意义  

Zircon U-Pb geochronology of ore-bearing olivine-pyroxenite of Changren Cu-Ni mining area in Helong, Jilin, and its geological significance

作　　者：吴琼 孙丰月[2] 刘金龙 田力丹[2] 范兴竹 WU Qiong;SUN FengYue;LIU JinLong;TIAN LiDan;FAN XingZhu(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;College of Earth Sciences,Jilin University,Changchun 130061,Jilin,China;Shenyang Center of Geological Survey,China Geological Survey,Shenyang 110000,Liaoning,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]吉林大学地球科学学院,吉林长春130061 [3]中国地质调查局沈阳地质调查中心,辽宁沈阳110000

出　　处：《矿床地质》2019年第3期620-630,共11页Mineral Deposits

基　　金：国家重点研发计划“南岭成矿带典型成矿系统的深部过程和成矿模式”(编号:2016YFC0600205)项目资助

摘　　要：长仁铜镍矿床位于华北克拉通铜镍硫化物矿床成矿带-吉黑成矿亚带,为一处岩浆硫化物矿床,成矿作用与镁铁质-超镁铁质岩体密切相关。文章对吉林省长仁铜镍矿区Σ11基性-超基性岩体中橄榄辉石岩进行了锆石LA-ICP-MS U-Pb年代学的研究,获得谐和年龄为(226±1)Ma,为印支晚期,限定长仁铜镍矿成岩成矿时代为晚三叠世,与红旗岭、漂河川、茶尖岭等矿床为同期岩浆活动的产物。结合区域内前人研究成果,认为古亚洲洋最终闭合时间为晚二叠世到早三叠世,晚三叠世已进入古亚洲洋闭合后伸展环境,长仁矿区成岩成矿大地构造背景为古亚洲洋闭合后的造山后伸展环境。This paper presents geochronology date of ore-bearing olivine-pyroxenite from Σ11 basic-ultrabasic rock mass of Changren Cu-Ni deposit in Helong, Jilin Province. Zircon LA-ICP-MS U-Pb analysis yields an age of (226±1)Ma for the unltramafic rock, indicating that these rocks were formed during the Late Triassic (Late Indosinian stage). Changren deposit was coeval with Hongqiling, Piaohechuan and Chajianling deposit, formed in the same tectonic setting. Based on the previous research results in this area, we consider that the final closing time of Paleo Asian Ocean was from the late Permian to the early to middle Triassic. The study area was dominated by post-collisional extensional setting during the late Triassic. The basic-ultrabasic rock mass of Changren was formed in post-collisional extensional setting after the closure of Paleo Asian Ocean.

关 键 词：地球化学 锆石U-PB测年 长仁铜镍矿 橄榄辉石岩 古亚洲洋 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]