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The authors would like to thank chief-engineer Cheng Yong and Li Yong, Cao Xinnan, Xie Chenghao from the Xinjiang Nonferrous Geological Survey Institute for their assistance in the field. We also thank the experts from the National 305 Project Office in Xinjiang for their kind help. This study was 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) and the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Grant No. MSFGPMR201810).

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    Abstract:

    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 clastic-carbonate 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.

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WANG Jialin, GU Xuexiang, XU Jingchi, ZHANG Yongmei, PENG Yiwei, LU Liangtao.2023.[J]. Acta Geologica Sinica(),97(2):404-417

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History
  • Received:November 03,2021
  • Revised:June 09,2022
  • Online: April 24,2023
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