Metallogenic characteristics of Shitoukengde intrusion and its implications for Ni-Co-(Cu)sulfide mineralization in East Kunlun  

作　　者：Xue-peng Duan Fan-cong Meng Zong-qi Wang Xiao-fei Yu 

机构地区：[1]Development and Research Center,China Geological Survey,Ministry of Natural Resources,Beijing 100037,China [2]China University of Geosciences(Beijing),Beijing 100083,China [3]Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《China Geology》2024年第4期714-729,共16页中国地质（英文）

基　　金：financially supported by the National Natural Science Foundation of China(41272052);the projects(1212011120158 and 12120114080101)of the China Geological Survey。

摘　　要：Xiarihamu deposit is the only super-large Ni-Co deposit found in East Kunlun orogenic belt(EKOB)until present.Shitoukengde(STKD)intrusion is considered to have the potential to become a large Ni-Co deposit in East Kunlun.In order to discuss the metallogenic potential,this study present petrographical,geochemical data,and zircon U-Pb dating for the STKD intrusion.The STKD intrusion is hosted within mafic-ultramafic rocks which contain peridotite,pyroxenite and gabbro,and mainly intruded into the marble of the Paleoproterozoic Jinshuikou Group.Harzburgite and orthopyroxenite are the main country rocks for the Cu-Ni sulfide mineralization.Combine with the positiveε_(Hf)(t)values(+1.1 to+8.6)of zircons,the enrichment of LILEs,depletion of HFSEs,and lower Ce/Pb ratios of whole rocks indicate that the parental magma was originated from the depleted asthenospheric mantle and experienced 5%–15%crustal contamination.Troctolite formed during the Early Devonian and it has weighted mean^(206)Pb/^(238)U age of 412 Ma.Regional background information has indicated that the post-collisional extension setting has already existed during the Early Devonian,leading to the formation of STKD intrusion and Cu-Ni sulfide mineralization.STKD intrusion may have the potential to be one economic Cu-Ni sulfide deposit but seems unlikely to be a super-large one.

关 键 词：Troctolite Zircon U-Pb Mafic-ultramafic intrusion Depleted asthenospheric mantle Cu-Ni sulfide mineralization East Kunlun orogenic belt Shitoukengde 

分 类 号：P618.2[天文地球—矿床学]