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This study was financially supported by the National Natural Science Foundation of China (Grant Nos. 42172258, 42072227, U2244205), the Science and Technology Major Project of Xinjiang Uygur Autonomous Region, China (2023A03002), the National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2015BAB05B04), the Joint Innovation Fund of China National Uranium Co., Ltd., and State Key Laboratory of Nuclear Resources and Environment (Grant No. NRE2021-01) and the China Geological Survey (Grant Nos. DD20242868, DZLXJK202206). We are thankful for the assistance from Wang Xiaohu, Wang Wei, Du Xiaofei, Ma Ji, Yang Bing, Zhang Tao, and Ding Zhilei during fieldwork. The authors give their sincerest thanks to the reviewers and editors.

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    Abstract:

    The Southwest Tianshan is the suture zone between the Central Tianshan and the Tarim Craton. To better illustrate the subduction polarity of the Southwest Tianshan Ocean, a systematic detrital zircon LA-ICP-MS U-Pb geochronology of sedimentary rocks of the Devonian Apadaerkang Formation and the Carboniferous Akeqiayi Group of the Biedieli area in the Wushi region is the focus. Detrital zircon ages indicate that the youngest grains of the targeted quartz sandstones are Late Devonian and Early Carboniferous in age, respectively. These ages also have relatively similar age spectra, indicating a similar tectonic setting and source in the Biedieli area during the Devonian to Carboniferous. The main spectrum peaks occur at 2360, 1960, 810, 640 and 440 Ma, with a principal age peak in the early Paleozoic (474–430 Ma), and the Central Tianshan Terrane is indicated as the main source. The detrital zircon geochronology and sedimentary characteristics of the Biedieli rocks indicate that the Paleozoic sedimentary rocks in the northern Wushi region were formed at an active continental margin, associated mainly with the early Paleozoic subduction of the South Tianshan Ocean.

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HUO Hailong, CHEN Zhengle, ZHANG Qing, HAN Fengbin, ZHANG Wengao, WANG Yong, WANG Wenbao.2025.[J]. Acta Geologica Sinica(),99(1):38-52

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History
  • Received:December 26,2023
  • Revised:June 19,2024
  • Online: February 17,2025
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