西北地质2025，Vol.58Issue(4)：87-101,15.DOI:10.12401/j.nwg.2024088
新疆东天山月牙湾铜镍硫化物矿床Sr-Nd-Pb-S同位素特征及其地质意义
Sr-Nd-Pb-S Isotopic Characteristics and Its Geological Significance of the Yueyawan Cu-Ni Sulfide Deposit in East Tianshan,Xinjiang
摘要
Abstract
The East Tianshan orogenic belt is an important Cu-Ni sulfide mineralization belt in China.Howev-er,the mantle source and sulfur saturation mechanism are still controversial.The newly discovered Yuyawan Cu-Ni sulfide deposit in the Dananhu arc provides a new target for these issues.The Yueyawan intrusion formed by two intrusive phases:the phase I is composed of gabbro,troctolite and olivine gabbro,and the phase II is com-posed of fine-grained olivine gabbro and fine-grained troctolite.The phase II rocks primarily contained sulfides.The rocks have low(87Sr/86Sr)i(0.703 3～0.703 48),high εNd(t)(6.54～8.35)and low Pb isotopic ratios((206Pb/204Pb)i=17.828～18.014,(207Pb/204Pb)i=15.446～15.478,(208Pb/204Pb)i=37.495～37.698),indicating that the Yueyawan intrusion is not directly related to the Tarim Large Igneous Province,but originated from the deplet-ed mantle and was replaced by subduction materials.The δ34S of sulfide ranges from 0.03‰ to 4.09‰,which is consistent with the δ34S of Carboniferous and Permian strata in Karatag area,indicating the addition of sulfur in the crust during the mineralization process.The mafic-ultramafic intrusions in the Dananhu arc have similar em-placement age and geochemical characteristics to those in Kangur shear belt and Middle Tianshan block,togeth-er with the denudation is relatively weak,which indicates that the Dananhu arc is an essential prospecting target for Cu-Ni mineralization in East Tianshan.关键词
岩浆源区/硫饱和机制/同位素/月牙湾矿床/东天山Key words
magma source/sulfur saturation mechanism/isotopic characteristics/Yueyawan Cu-Ni deposit/East Tianshan分类
天文与地球科学引用本文复制引用
周国超,王玉往,王京彬,石煜,解洪晶,李德东,程先锋..新疆东天山月牙湾铜镍硫化物矿床Sr-Nd-Pb-S同位素特征及其地质意义[J].西北地质,2025,58(4):87-101,15.基金项目
国家重点研发计划项目子课题"幔源岩浆型成矿系统三维机构与矿体定位机制"(2017YFC0601204)资助. （2017YFC0601204）
