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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

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Acta Geologica Sinica(English Edition) 2023年第2期97卷 404-417页

作者： WANG Jialin GU Xuexiang XU Jingchi ZHANG Yongmei PENG Yiwei LU Liangtao State Key Laboratory of Processes and Mineral Resources China University of Geosciences(Beijing)Beijing 100083China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Development Research Center of the China Geological Survey Beijing 100037China Mineral Exploration Technical Guidance Center of the Ministry of Natural Resources Beijing 100083China State Key Laboratory of Tectonic Controls on mineralization and Hydrocarbon Accumulation of the Ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China

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 ***,it hosts a lot of medium–to large-scale sedimentary exhalative(sedex)pb-zn deposits that mainly occur in Proterozoic metamorphosed clasticcarbonate *** 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 *** maximum depositional age of the siltstones was determined to be about 604 Ma,the diorite having formed at approximately 500 *** such,the Haerdaban Group was most likely formed in the Neoproterozoic Sinian,rather than the previously considered Mesoproterozoic *** 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 *** 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

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