2022 Vol. 28, No. 3
Article Contents

XILUO Langjie, WANG Genhou, ZENG Qinggao, FENG Yipeng, Cidan, HAN Ning, ZHANG Peilie, WEI Yansong, WANG Weiyi. 2022. The kinks of the Yeba Group in the southern margin of the central Gangdese of Xizang and its geological significance. Journal of Geomechanics, 28(3): 338-352. doi: 10.12090/j.issn.1006-6616.2021163
Citation: XILUO Langjie, WANG Genhou, ZENG Qinggao, FENG Yipeng, Cidan, HAN Ning, ZHANG Peilie, WEI Yansong, WANG Weiyi. 2022. The kinks of the Yeba Group in the southern margin of the central Gangdese of Xizang and its geological significance. Journal of Geomechanics, 28(3): 338-352. doi: 10.12090/j.issn.1006-6616.2021163

The kinks of the Yeba Group in the southern margin of the central Gangdese of Xizang and its geological significance

    Fund Project: This study is finacially supported by the Specialized Scientific Research Fund of Geological and Mineral Exploration Development Bureau of Xizang Autonomous Region (Grant No.42172259) and National Natural Science Foundation of China (Grant No.1212011221115)
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  • The Yeba Group, located in the southern margin of Gangdese, is a typical structural transition zone with complex multistage structural deformations. Previous evidence has shown that these complex structural deformations are related to the Qulong and Jiama deposits developed in the Yeba Group. Kinks therein are a representative of structural deformation in the brittle-ductile structural transition zone. Their deformation and distribution characteristics, kinematic features and temperature environment are the focus of this study, so as to explore the tectonic background. The results from the chlorite thermometer and calcite e-twins characteristics show that the temperature is between 170℃~299℃ for the formation of the kinks in the study area, indicating a tectonic uplift during the formation process. According to the kinematic analysis of the kinks based on field outcrops and BSE-based images, it is inferred that the principal compressive stress is top-down (vertically downward), which is consistent with the principal compressive stress of the large-scale NS-trending gliding nappes in the southern margin of Gangdese during that period. Combined with the results of the relative chronological analysis, we believe that the kinks developed in the Yeba Group are the product of brittle-ductile deformation under the extension of the southern Lhasa terrane since 25 Ma.

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