| 龙门山构造带晚新生代剥蚀作用与均衡隆升的地表过程研究 |
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| 关键词:paleo-residual surface reconstruction flexural deflection model surface denudation isostatic uplift Longmen Shan eastern margin of the Tibetan Plateau |
| 基金项目:国家自然科学基金项目(编号: 41402159; 41741003; 40841010; 40972083; 41172162; 41372114; 41340005; 41502116);国家重点研发计划项目(编号: 2017YFC1501000);中国地质调查局地质调查工作项目(编号: 121201010000150004-08; 12120115004501-01);油气藏地质及开发工程国家重点实验室(成都理工大学)自主研究课题(编号: SK-0801) |
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| Late Cenozoic Surface Process Caused by Denudation and Isostatic Rebound of the Longmen Shan Tectonic Belt on the Eastern Margin of the Tibetan Plateau |
| On the basis of the SRTM DEM data, with the Longmen Shan on the eastern margin of the Tibetan Plateau as the research area and in combination with the analyzing swath profiles, rebuilding paleo-residual surfaces and simulating elastic deflection model, the authors calculated the quantitative relationship between isostatic rebound and surface erosion of the Longmen Shan area in Late Cenozoic, and discussed the surface response process of the Longmen Shan caused by the effect of denudation and isostatic uplift. The results provide a basis for quantitative study of the uplift mechanism of the Longmen Shan on the eastern margin of the Tibetan Plateau since Late Cenozoic. Firstly, the value of the surface denudation volume in the Longmen Shan is (0.74~1.14)×105 km3 , There is a high value of the erosion amount in Minshan block, the middle and lower reaches of Fujiang River, Minjiang River, Qingyi River and three main faults of the Longmen Shan. Among them, the value of the denudation volume in Minshan block area is about 17%~21% of the total denudation volume, the denudation amount in the northern segment of Longmen Shan is approximately 20%~23%, the denudation amount is about 28%~34% in the middle segment, and the denudation amount is about 24%~29% in the southern segment. Secondly, a large amount of surface denudation drived isostatic rebound of the Longmen Shan on the eastern margin of the Tibetan Plateau, of which the value was nearly 2 km. Thirdly, there has been a spatial matching feature between the amount of surface denudation and isostatic uplift in the Longmen Shan since Late Cenozoic. The value of isostatic uplift in Minshan block, the middle and southern segment of the Longmen Shan was bigger than the other areas of the Tibetan Plateau. It is thus shown that there have been different features of structure morphology and surface processes associated with denudation-uplift in different segments of Longmen Shan area since Late Cenozoic. The history of Longmen Shan’s uplift is a production of multiphase and superposition of multiple uplifting mechanism, which has been a historical and compound uplift process. It is held that the isostatic uplift and surface denudation control the relief of the Longmen Shan in the same time scale and space scale, and constrain the uplifting mechanism of the Longmen Shan on the eastern margin of the Tibetan Plateau. |
| YAN Liang,LI Yong,DENG Tao,YAN Zhao-kun,YUN Kun,SHAO Chong-jian,DONG Shun-li.2019.Late Cenozoic Surface Process Caused by Denudation and Isostatic Rebound of the Longmen Shan Tectonic Belt on the Eastern Margin of the Tibetan Plateau[J].Acta Geoscientica Sinica,40(1):76-92. |
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