地质学报2017，Vol.91Issue(4)：724-735,12.
东昆仑冰沟南铜镍矿锆石SHRIMPU-Pb年龄及构造意义
Zircon SHRIMP U-Pb Age of the Binggounan Magmatic Ni-Cu Deposit in East Kunlun Mountains and Its Tectonic Implications
摘要
Abstract
The Binggounan mafic-ultramafic intrusion is located in the East Kunlun orogenic belt that belongs to the southwestern margin of Qaidam basin and adjacent to the Kunbei fault.This intrusion is mainly made up of olivine-pyroxenite,gabbro,diorite and diabase dykes,but the orebodies only occur in the olivine-pyroxenite.Petrologic and geochemical characteristics show that the Binggounan mafic-ultramafic intrusion was a ferruginous series mafic-ultramafic intrusive body and the deposit belongs to magmatic segregation sulfide Cu-Ni deposit.The SHPIMP U-Pb age (377.8±3.4 Ma) of the zircons in the olivine-pyroxenite indicates that it is a relatively young Cu-Ni deposit in the East Kunlun orogenic belt.The rocks in the deposit have positive εNd(t) values ranging from +2.35 to +3.81 and (87Sr/86Sr)i from 0.7057 to 0.7105,indicating that the magma have experienced some contamination of the surrounding rocks which probably led to the sulfur saturation and then the immiscible of the sulfides.The Binggounnan Cu-Ni deposit perhaps is a product in the post-collision tectonic setting,which is different from the Xiarihamu Cu-Ni deposit.Therefore,the study is of significant implication for the exploration of Cu-Ni deposits in the East Kunlun orogenic belt.关键词
构造意义/铜镍矿/晚古生代早期/锆石SHRIMP U-Pb年龄/镁铁—超镁铁质侵入岩/冰沟南Key words
tectonic implication/magmatic Ni-Cu deposit/Early Late Paleozoic/zircon SHRIMP U-Pb age/mafic-ultramafic intrusions/Binggounan引用本文复制引用
张照伟,王亚磊,钱兵,李文渊..东昆仑冰沟南铜镍矿锆石SHRIMPU-Pb年龄及构造意义[J].地质学报,2017,91(4):724-735,12.基金项目
本文为国土资源部公益性行业科研专项(编号:201511020)和中国地质调查局地质调查项目(编号:DD20160013)资助的成果. （编号:201511020）
