Home > Archive>Volume 97, Issue 5, 2023 >1422-1450. DOI:10.1111/1755-6724.15077
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This work was jointly funded by the National Natural Science Foundation of China (Grant Nos. 41972120, 42172129), the State Key Laboratory of Paleobiology and Stratigraphy (Nanjing Institute of Geology and Paleontology, CAS) (Grant No. 173131), the Science and Technology Cooperation Project of the CNPC-SWPU Innovation Alliance (Grant No. 2020CX050103) and the China Postdoctoral Science Foundation (Grant No. 2021M702720). Gao Lubiao and Zhu Guangyi are thanked for samples pretreatment.

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    Abstract:

    Deep-water gravity depositional processes and evolution in arc systems have become topics of intense research focus in recent years. This study discusses the co-evolution of volcanism and deep-water gravity flow deposits at the southern margin of the Junggar Basin, based on petrology, geochronology and geochemical analyses. The results show that a massive collapse of unstable sediments from the slope was triggered by volcanism, resulting in the formation of slumping gravity flows. The occurrence of volcanic beds in the slump deposits confirm that synchronous volcanism likely affected sediment instability, triggering gravity flows. The Th/Yb, Ta/Yb and Th/Ta elemental ratios, U-Pb ages of detrital zircons and paleocurrent directions indicate that the North Tianshan (NTS) island arc represents the provenance of the Qianxia Formation. Moreover, statistical data on the pyroclastic components in the gravity flow deposits reveal an intensity index of volcanism, indicating that volcanism is strongly related to gravity flow deposits, especially in terms of the type and distribution of the deposits. A model for volcanically-triggered deep-water gravity flow deposits is established, in order to provide a more in-depth understanding of the co-evolution of volcanism and gravity flow deposits within the depositional setting of the late Paleozoic NTS oceanic subduction margin in the Junggar Basin.

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LI Shixin, ZHANG Tingshan, ZHANG Xi, LIANG Zeliang, JI Dongsheng, Mihai Emilian POPA, YONG Jinjie, LUO Jinyu, ZENG Jianli, ZHU Haihua.2023.[J]. Acta Geologica Sinica(),97(5):1422-1450

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History
  • Received:September 21,2022
  • Revised:May 15,2023
  • Online: October 24,2023
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