| 青藏高原中部非均匀地壳变形演化及其大型断裂带的控制作用 |
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| 关键词:Tibetan Plateau Qiangtang block north-south trending grabens extension rate inhomogeneous crustal deformation |
| 基金项目:由国家自然科学基金项目(编号: 42572279; 42230312; 4232500507; 4201001055; 42072240; 42372274; 42172262; 41941016-3)、 中国地质调查局地质调查项目(编号: DD20240041)、国家重点研发计划项目(编号: 2023YFC3012003)、国家基础地质调查项目 (编号: 2021FY100101)和中国地质科学院基本科研业务费项目(编号: JKYZD202307; JKYQN202314)联合资助。 |
| 作者 | 单位 | E-mail | | 郑勇 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | zygeology@126.com | | 李海兵 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | lihaibing06@163.com | | 卢海建 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 赵中宝 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 潘家伟 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | Marie-Luce CHEVALIER | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 张蕾 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 刘栋梁 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 司家亮 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 王焕 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 马绪宣 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | | | 杨少华 | 中国地质科学院地质研究所, 自然资源部大陆动力学重点实验室
江苏东海大陆深孔地壳活动国家野外观测研究站 | |
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| 摘要: |
| Tectonic Evolution of Inhomogeneous Crustal Deformation and Controlling Effect of Large-Scale Fault Belt along Central Tibet |
| The Cenozoic crustal deformation and evolution of the Qiangtang block in the central Tibetan Plateau gradually drove the migration and extrusion of plateau materials eastward, but its mechanism has always been one of the difficulties in geological research worldwide. Based on detailed field geological surveys and interdisciplinary studies, this study innovatively proposes several important results: (1) The strike-slip faulting at the lithospheric scale in the southern part of the Qiangtang block began around 35 Ma, together with the Ailaoshan–Red River and Jiali shear zones in the eastern region, forming a giant strike-slip boundary fault belt with a length of 2 500–3 000 km, which drives significant uplift of the central valley. (2) The material in the western segment began to migrate eastward diffusely and inhomogeneously at approximately 15 Ma, in association with the formation of a series of nearly north-south trending grabens. Among the grabens, the extension rate of ~2.3 mm/a in the western margin is much higher than that in the central segment. In combination with elastic flexure modelling, the results reveal that the eastward migration of crustal material in the western and middle segment is limited to the upper crust, but is incompletely decoupled due to the influence of rising heat flow from the middle and lower crust. (3) Since 23 Ma, the eastern segment of the block has been mainly controlled by the strike-slip fault and inhomogeneously extruded eastward-southeastward. By ~10 Ma, this inhomogeneous extrusion gradually extended to the entire eastern block. Therefore, compared with southern Tibet, the eastward migration across central Tibet is developed in an inhomogeneous mode. The tectonic evolution of the inhomogeneous crustal deformation and the controlling effect of the large-scale fault belt along central Tibet is of great significance to understanding the stress propagation and formation processes of the Tibetan Plateau. |
| ZHENG Yong,LI Haibing,LU Haijian,ZHAO Zhongbao,PAN Jiawei,Marie-Luce CHEVALIER,ZHANG Lei,LIU Dongliang,SI Jialiang,WANG Huan,MA Xuxuan,YANG Shaohua.2026.Tectonic Evolution of Inhomogeneous Crustal Deformation and Controlling Effect of Large-Scale Fault Belt along Central Tibet[J].Acta Geoscientica Sinica,47(1):1-16. |
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