【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。更多还原

【Abstract】 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.更多还原