Accretionary orogenic processes of the Beishan orogenic belt

SONG Dongfang; XIAO Wenjiao; ZENG Hao; MAO Qigui; AO Songjian

doi:10.12097/gbc.2024.09.040

2024 Vol. 43, No. 12

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SONG Dongfang, XIAO Wenjiao, ZENG Hao, MAO Qigui, AO Songjian. 2024. Accretionary orogenic processes of the Beishan orogenic belt. Geological Bulletin of China, 43(12): 2131-2150. doi: 10.12097/gbc.2024.09.040

Citation:

SONG Dongfang, XIAO Wenjiao, ZENG Hao, MAO Qigui, AO Songjian. 2024. Accretionary orogenic processes of the Beishan orogenic belt. Geological Bulletin of China, 43(12): 2131-2150. doi: 10.12097/gbc.2024.09.040

Accretionary orogenic processes of the Beishan orogenic belt

1.
State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
National Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China

Received Date: 11 July 2024

Revised Date: 30 September 2024

Publish Date: 15 December 2024

Abstract

Abstract

The Beishan orogenic belt is located in the middle of the southern margin of the Central Asian orogenic belt, and is at the key tectonic position of the east−west tectonic connection. In recent years, the tectonic evolution of Beishan has become a research focus, and important progress has been made in the aspects of orogenic basement, magmatism, ophiolitic mélanges, sedimentation, and deformation. This paper focuses on recent advances and summarizes the basic characteristics of each tectonic unit of Beishan, particularly the spatial−temporal distribution of magmatism and ophiolitic mélanges, and discusses the accretionary processes of Beishan. The Precambrian magmatic records are scattered Mesoproterozoic (Ca. 1.4 Ga) and Neoproterozoic (Ca. 0.9~0.8 Ga) gneissic granitoids, and there is no large−scale Precambrian basement in Beishan. Continuous magmatism developed from Early Paleozoic to Early Mesozoic across Beishan. The ophiolitic mélanges changed from Cambrian–Ordovician in the middle to Carboniferous–Permian in the north and south, and the final suture zone is located in the Liuyuan–Houhongquan area in southern Beishan. The ages of mafic rocks and the youngest sedimentary matrix jointly define the age for terminal accretion as the Middle–Late Triassic. Beishan was located at the margin of supercontinent from the Mesoproterozoic, and then experienced long−term accretion in Neoproterozoic and Paleozoic, and terminated accretionary orogeny and shifted to intracontinental evolution in Triassic. The accretion of mantle−derived arc magmatism and growth of accretionary wedges are of great significance to continental growth during the long−lived accretionary orogenesis.
- Beishan orogenic belt /
- magmatism /
- ophiolitic mélange /
- accretionary orogeny /
- continental growth

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References

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