Petrogenesis and Tectonic Implications of the Carboniferous Andesites from Bayingou in the North Tianshan Belt, Xinjiang

CHEN Jian; WANG Xin; MENG Yuanku; XIONG Fahui; MENG Fanxue

doi:10.12401/j.nwg.2024006

2024 Vol. 57, No. 3

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Article navigation > Northwestern Geology > 2024 > 57(3): 91-112

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CHEN Jian, WANG Xin, MENG Yuanku, XIONG Fahui, MENG Fanxue. 2024. Petrogenesis and Tectonic Implications of the Carboniferous Andesites from Bayingou in the North Tianshan Belt, Xinjiang. Northwestern Geology, 57(3): 91-112. doi: 10.12401/j.nwg.2024006

Citation:

CHEN Jian, WANG Xin, MENG Yuanku, XIONG Fahui, MENG Fanxue. 2024. Petrogenesis and Tectonic Implications of the Carboniferous Andesites from Bayingou in the North Tianshan Belt, Xinjiang. Northwestern Geology, 57(3): 91-112. doi: 10.12401/j.nwg.2024006

Petrogenesis and Tectonic Implications of the Carboniferous Andesites from Bayingou in the North Tianshan Belt, Xinjiang

1.
1 1. 山东省第八地质矿产勘查院，山东日照　276800
1.
1 ¹Number 8 Geological Team of Shandong Provincial Bureau of Geology and Mineral Resources, Rizhao 276800, Shandong, China
2.
2 2. 日照地质地理信息大数据研究院，山东日照　276800
2.
2 ²Rizhao Big Data Research Institute of Geology and Geographic Information, Rizhao 276800, Shandong, China
3.
3 3. 山东省地矿局有色金属矿找矿与资源评价重点实验室，山东日照　276800
3.
3 ³Key Laboratory of Nonferrous Metal Ore Exploration and Resource Evaluation of Shandong Provincial Bureau of Geology and Mineral Resources, Rizhao 276800, Shandong, China
4.
4 4. 山东科技大学地球科学与工程学院，山东青岛　266590
4.
4 ⁴College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
5.
5 5. 地幔研究中心，自然资源部深地动力学重点实验室，中国地质科学院地质研究所，北京　100037
5.
5 ⁵CARMA (Center for Advanced Research on Mantle), Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Fund Project: 山东省高等学校青创科技支持计划（2019KJH004）资助。

Received Date: 06 March 2023

Revised Date: 29 November 2023

Accepted Date: 12 January 2024

Publish Date: 20 June 2024

Abstract

Abstract

The Late Paleozoic volcanic rocks in the North Tianshan complex belt are the products of closure of the North Tianshan Ocean, which are important for understanding the Paleozoic evolution history of the Paleo-Asian Ocean. In this study, we present new petrological, mineralogical, geochronological and geochemical data on the Carboniferous Bayingou andesites in the North Tianshan belt, and discuss their petrogenesis and tectonic implications of the andesites. The results show that: ① the andesites belong to the calc-alkaline series that formed in a convergent continental margin setting related to the plate subduction in this study, whereas these andesites have low MgO (＜3%) contents that are different from typical high-Mg andesites (＞6%), whereas the andesites have high Mg^# values (＞45), indicating mantle materials participating in the formation of the andesites. ② In-situ LA-ICP-MS zircon U-Pb dating on the andesites of the Bayingou Formation yielded an weighted average age of (324.1±1.1) Ma (MSWD=1.5), representing the emplacement age of the andesites. The Carboniferous andesites were a mixing product of the felsic and mantle-derived melts, and the felsic melts were derived from partial melting of the mafic lower crust in the North Tianshan orogenic belt. Integrated with the previous studies and geological data, this study holds that the Bayingou Carboniferous andesites were generated in a subduction zone or arc-related environment, which further indicates that the North Tianshan Ocean was still not closed in the late Early Carboniferous.

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