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

XILUO Langjie; WANG Genhou; ZENG Qinggao; FENG Yipeng; Cidan; HAN Ning; ZHANG Peilie; WEI Yansong; WANG Weiyi

doi:10.12090/j.issn.1006-6616.2021163

Volume 28 Issue 3

Jun. 2022

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Article Navigation > Journal of Geomechanics > 2022 > 28(3): 338-352

XILUO Langjie, WANG Genhou, ZENG Qinggao, et al., 2022. The kinks of the Yeba Group in the southern margin of the central Gangdese of Tibet and its geological significance. Journal of Geomechanics, 28 (3): 338-352. DOI: 10.12090/j.issn.1006-6616.2021163

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

doi: 10.12090/j.issn.1006-6616.2021163

1.
Geological and Mineral Exploration and Development Bureau of Tibet Autonomous Region, Lhasa 850000, Tibet, China
2.
School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
3.
No. 6 Geological Team, Geological and Mineral Exploration and Development Bureau of Tibet Autonomous Region, Lhasa 851400, Tibet, China

Funds:

the Specialized Scientific Research Fund of Geological and Mineral Exploration Development Bureau of Tibet Autonomous Region 42172259

National Natural Science Foundation of China 1212011221115

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Abstract

Abstract

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.
- Gangdese,
- Yeba Group,
- kinks,
- conjugate kink-band,
- temperature environment

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致谢: 感谢野外工作中西藏地勘局地质六队的大力支持；感谢高曦博士、唐宇博士及李典博士在成文过程中的宝贵建议！感谢河北省区域地质勘查有限公司实验室在电子探针实验方面的帮助！

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