Quantitative Estimation of Surface Denudation in Longmen Shan during Late Cenozoic
Wang Yan
Liu Shaofeng
Fu Bihong
Xing Shuwen
Abstract：Longmen Shan located at the eastern margin of Tibetan Plateau represents the steepest gradient of the Tibetan Plateau edges. To assess the large-scale denudation volume in Longmen Shan,Late Cenozoic,surface denudation is quantitatively calculated along sev-eral large drainage basins such as Qingyijiang,Minjiang,Tuojiang,and Fujiang rivers by using digital elevation models (DEM)data, and residual surface method with paleo-residual surface DEM minus modern surface topography in this study.It is found that the Late Cenozoic denudation volume of upper reaches in Longmen Shan drainage basin is between 80 500 and 92 800 km3 .Minjiang River has the largest contribution ratio to denudation in Longmen Shan (33.9%-37.1%),followed by Fujiang (33.6%-38.4%)and Qingyi-jiang Rivers (24.1%-31.9%),and Tuojiang River has minimum contribution (0.4%-0.6%).A rapid erosional removal from the Longmen Shan by repeated great seismic events like the Wenchuan earthquake on May 12th,2008,may be a main reason of the surface erosion in Late Cenozoic Longmen Shan along the eastern margin of Tibetan Plateau.
Keywords：Longmen ShanLate Cenozoicdenudationquantitative analysisresidual surfacetectonics
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 953-964,1060 )