首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Geomorphic constraints on the active tectonics of southern Taiwan
Authors:Lucy A Ramsey  Richard T Walker  James Jackson
Institution:Bullard Laboratories, Madingley Road, Cambridge, CB3 0EZ, UK; Department of Earth Sciences, University of Oxford, Parks Road, OX1 3PR;, UK BG Group, Thames Valley Park, Reading, Berkshire, RG6 1PT, UK.;E-mail:
Abstract:Taiwan is a region of rapid active tectonics, yet the study of the tectonic processes that shape the interior of the island is difficult due to the high rates of erosion and dense vegetation. We use digital topography to look for indications of active deformation preserved in the local geomorphology. In particular, anomalies in the regional pattern of drainage are used to infer zones of enhanced tectonic activity. The apparent anticlockwise rotation of major river systems in plan view indicates the presence of a diffuse zone of left-lateral shear running down the southeastern side of Taiwan. Asymmetries in the catchments of individual drainage basins show the influence of varying rates of uplift across southern Taiwan, with the most rapid uplift close to Taitung at the indentation point of the Luzon arc with the Chinese continental margin. Our interpretations, though based predominantly on remote-sensing observations, are consistent with the available field evidence. This study demonstrates the usefulness of drainage basins as tectonic markers in the quantification of regional strain and uplift, which may have wider applicability in other deforming parts of the world.
Keywords:active tectonics  drainage anomalies  geomorphology  Taiwan
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号