Redetermination of the Depositional Age of the Haerdaban Group in the Northern Margin of the Yili Block,Western Tianshan,NW China:Implications for Regional Tectonics and Pb-Zn Mineralization  

作　　者：WANG Jialin GU Xuexiang XU Jingchi ZHANG Yongmei PENG Yiwei LU Liangtao 

机构地区：[1]State Key Laboratory of Processes and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China [2]School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China [3]Development Research Center of the China Geological Survey,Beijing 100037,China [4]Mineral Exploration Technical Guidance Center of the Ministry of Natural Resources,Beijing 100083,China [5]State Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of the Ministry of Natural Resources,Chengdu University of Technology,Chengdu 610059,China

出　　处：《Acta Geologica Sinica(English Edition)》2023年第2期404-417,共14页地质学报（英文版）

基　　金：funded by the Key Project of the National Natural Science Foundation of China(Grant No.42130804);the National Key R&D Program of China(Grant No.2018YFC0604003);the Fundamental Research Funds for the Central Universities(Grant No.35942019012);the State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Grant No.MSFGPMR201810)。

摘　　要：The Yili Block in the Western Tianshan orogen is a key area for understanding the early crustal formation and evolution of the Central Asian orogenic belt,due to the widely-distributed Precambrian rocks.Also,it hosts a lot of medium–to large-scale sedimentary exhalative(SEDEX)Pb-Zn deposits that mainly occur in Proterozoic metamorphosed clasticcarbonate rocks.In this study,LA-ICP-MS U-Pb analyses were carried out on detrital zircons in siltstones of the Precambrian Haerdaban Group in the Haerdaban Pb-Zn deposit and magmatic zircons in the diorite dyke that cuts through the strata and orebodies.The maximum depositional age of the siltstones was determined to be about 604 Ma,the diorite having formed at approximately 500 Ma.As such,the Haerdaban Group was most likely formed in the Neoproterozoic Sinian,rather than the previously considered Mesoproterozoic Changchengian.Detrital materials of the Haerdaban Group were mostly derived from the Nanhua–Sinian mafic dykes and granitic rocks around Lake Sayram at the northern margin of the Yili Block.It is proposed that the Yili Block,together with the Kazakhstan and Central Tianshan blocks and the Tarim Craton,might all pertain to the same Rodinia supercontinent,which has great potential for targeting large to super-large SEDEX Pb-Zn deposits.

关 键 词：Haerdaban Group zircon U-Pb dating SEDEX Pb-Zn mineralization Neoproterozoic Yili Block Western Tianshan 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]