Review and New Insights on Foreland Tectonics in Peikang Basement High
Speaker: Wu-Cyun Sun
Abstract
The foreland tectonics in western Taiwan can be divided into two domains: pre-orogenic extensional structures and those of the outer part of the fold-and-thrust belt that mingled with syn-orogenic normal fault reactivation. Results from several studies have been synthesized to provide a tectonic map displaying the regional distribution of tectonic settings at different stages and the trends of normal faults in western Taiwan.
The main periods of erosion were during the Oligocene and Plio-Pleistocene. The maximum true erosion at the Oligocene unconformity was 3500 m on the Penghu Platform. The maximum true erosion at the Pleistocene unconformity was 500 m on the eastern side of the Penghu Island.
We inspired by the reactivated normal fault structures observed in offshore northwestern Taiwan, and we regarded all low-angle thrusts in the inner part of the fold-and-thrust belt in northwestern Taiwan as originating from normal-fault inversion. We applied a similar concept to interpret the structures in southwestern Taiwan.
Reference
Fuh, S. C., 2000, Magnitude of Cenozoic erosion from mean sonic transit time, offshore Taiwan: Marine and Petroleum Geology, v. 17, p. 1011–1028
YANG, K. M., HUANG, S. T., WU, J. C., TING, H. H., MEI, W. W., 2006, Review and new Insights on foreland tectonics in western Taiwan: International Geology Review, Vol. 48, p. 910–941