Mafic-ultramafic magma activity and copper-nickel sulfide metallogeny during Paleozoic in the Eastern Kunlun Orogenic Belt,Qinghai Province,China

作     者：Zhao-wei Zhang Ya-lei Wang Chi-yuan Wang Bing Qian Wen-yuan Li Jiang-wei Zhang Min-xin You 

作者机构：Key Laboratory for the Study of Focused Magmatism and Giant Ore DepositsXi’an Center of China Geological SurveyMinistry of Natural ResourcesXi’an 710054China Natural Resources Department of Xinjiang Uygur Autonomous RegionUrumqi 830000China Institute of Earth SciencesChengdu University of GeosciencesChengdu 610059China 

出 版 物：《China Geology》 (中国地质（英文）)

年 卷 期：2019年第2卷第4期

页      面：467-477页

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：This study was financially supported by the Special Fund for Land and Resources Scientific Research of Public Interest(201511020) the Natural Science Foundation of Shaanxi Province(2017JM4002) Natural Science Foundation of China(41873053) 

主　　题：Early Devonian Early Carboniferous Mafic-ultramafic complexes Cu-Ni deposit Mineral exploration engineering Eastern Kunlun orogenic belt Qinghai China 

摘      要：The Eastern Kunlun Orogenic Belt(EKOB)has a complex geological structure and diverse magmatic activities,which are closely related to the Qaidam Basin and the Tethys tectonic *** are at least 3 stages mafic-ultramafic rocks occurred in the Early Paleozoic in *** first stage is the Later-Silurian to Early Devonian,represented by the giant Xiarihamu super large magmatic Cu-Ni deposit,containing about 1.18 million metric tons(Mt)of nickel with average grades of 0.65%Ni,and its age of ore-forming pyroxene peridotite is 411 Ma;The second stage is the Early Carboniferous,represented by the large Shitoukengde magmatic Cu-Ni sulfide deposit,and its ore-forming age of the olivine websterite is 334 Ma;The third stage of mafic-ultramafic rocks occurred mainly during the Middle-Late Triassic,represented by Xiaojianshan,Lalinggaoli,and Kaimuqi complexes,and no economical ore bodies have been found in this *** authors summarized the difference between the ore-bearing and the nonmineralized mafic-ultramafic rocks in the *** olivine of the ore-bearing complexes contains higher MgO and SiO2 content but lower FeO and CaO contents,and the clinopyroxene of ore-bearing complexes contains lower FeO and CaO *** sulfur contamination is key to the formation of the giant Xiarihamu Ni deposit,and crustal sulfur contamination degree of the giant magmatic Ni deposit is higher than that of large Ni *** above indicators could guide the exploration and evaluation of similar deposits in the EKOB.