The structure and kinematics of the central Taiwan mountain belt derived from geological and seismicity data
Presenter: Ting-Hsuan Hsu
Date: 2013/1/3Abstract
The structural of Central Taiwan is thought to be that of an imbricate thrust and fold belt above a shallowly dipping basal detachment. Currently, with a growing amount of geophysical data from the internal part of the mountain belt indicates the existence of widespread fault activity in the middle and lower crust, well below the level of the proposed detachment. It suggests that deeper levels of the crust must be involved in the deformation. From focal mechanism, seismicity energy release data and field data show that the faults within the study area are currently active which also show by using river incision, channel morphology, and stream gradients along Peikang River. Furthermore, they suggest that there is a transpressional zone within the Hsuehshan Range that is bound by the Lishan fault in the east and the Shuilikeng fault system in the west. In the Hsuehshan and Central Ranges, their data show the presence of two fault systems. The first one is an earlier and inactive thrust system with a well-developed cleavage is cut by a system of steeply dipping active faults that penetrate to a depth of 25 to 30 km or more. The second fault system is suggestive of the reactivation of preexisting basin-bounding faults that were located on the Eurasian continental margin in the Hsuehshan Range.
Reference
- Brown, D., J. Alvarez-Marron, M. Schimmel, Y.-M. Wu, and G. Camanni, The structure and kinematics of the central Taiwan mountain belt derived from geological and seismicity data, TECTONICS, VOL. 31, TC5013, doi:10.1029/2012TC003156, 2012
<full text> <abstract>
- Yanites J., G. Tucker, K. Mueller, Y.-G. Chen, T. Wilcox, S.-Y. Huang, K.-W. Shi, Incision and channel morphology across active structures along the Peikang River, central Taiwan: Implications for the importance of channel width, GSA Bulletin, v. 122; no. 7/8; p. 1192–1208; doi:10.1130/B30035.1, 2010