| Citation: |
TENG Xuejian, FU Chao, LI Junjian, LI Zhidan, TANG Wenlong. 2024. Characteristics and geological implications of the Ophiolite Belts in the Sino-Mongolian Border Region. North China Geology, 47(3): 1-13.
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Characteristics and geological implications of the Ophiolite Belts in the Sino-Mongolian Border Region
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Abstract
This paper is the research of ophiolite.[Objective] Ophiolites, as fragments of ancient oceanic lithosphere, serve as a natural laboratory for studying the evolution of the lithospheric mantle, material cycling in subduction zones, and reconstructing paleogeographic patterns.The China-Mongolia border region is located within the Central Asian Orogenic Belt(CAOB), where ophiolite(mélange)belts intermittently crop out along both sides of the boundary, exhibiting blocky and zonal distributions.[Methods]To further clarify the tectonic evolution of the CentralAsian Orogenic Belt and restore its structural framework, this paper relies on the results of the China-Mongolia collaborative 1/1 000 000 geological map series compilation project, combined with previous studies on the ophiolite (mélange) belts in this region.[Results]Fourteen ophiolite (mélange) belts were identified in the study area.A comprehensive explanation of their spatial-temporal distribution characteristics was provided, and a spatial-temporal framework for the distribution of the ophiolite (mélange) belts was established.[Conclusions] The results indicate that the ophiolite belts along the China-Mongolia border exhibit a trend of progressively younger ages from west to east (Neoproterozoic to Early Permian).This reveals differences in the evolution of the oceanic lithospheric mantle between the western and eastern segments of the Central Asian Orogenic Belt.Most ophiolite (mélange)belts are of the SSZ (supra-subduction zone)type, closely related to subduction processes.However, the tectonic settings of fore-arc and back-arc environments remain controversial and require further study. -
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References
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TENG Xuejian, FU Chao, LI Junjian, LI Zhidan, TANG Wenlong. 2024. Characteristics and geological implications of the Ophiolite Belts in the Sino-Mongolian Border Region. North China Geology, 47(3): 1-13.
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