HR: 0800h
AN: T51A-0310 [Abstracts]
TI: Exhumation history of the Puli basin and surrounding area in central Taiwan
AU: * Kuo, y
EM: smart0202@so.net.net.tw
AF: Department of Earth and Environmental Sciences, National Chung-Cheng University, 168
University Rd. Ming-Hsiung, Chai-Yi, 621, Taiwan
AU: Lee, Y
EM: seilee@eq.ccu.edu.tw
AF: Department of Earth and Environmental Sciences, National Chung-Cheng University, 168
University Rd. Ming-Hsiung, Chai-Yi, 621, Taiwan
AU: Hsu, C
EM: aqua7226@yahoo.com.tw
AF: Department of Earth and Environmental Sciences, National Chung-Cheng University, 168
University Rd. Ming-Hsiung, Chai-Yi, 621, Taiwan
AU: Wu, C
EM: d9065025@yahoo.com.tw
AF: Department of Earth and Environmental Sciences, National Chung-Cheng University, 168
University Rd. Ming-Hsiung, Chai-Yi, 621, Taiwan
AB:
Taiwan Orogeny to be the result of an oblique arc-continental collision between the Philippine Sea Plate and
Eurasia Plate. The Taiwan orogenic belt is major composed of Hshishan and Central Range located in western
and eastern side separately. The Central Range is major comprised of pre-Miocene metamorphic rock and the
Hsihshan Range is comprised of Eocene to Miocene passive margin sediment rocks. On the contrast to the
Central Range that has high denudation and uplift rate, the Hsihshan Range has lower denudation rate that can
reveal the early stage denudation history and variation mechanism of mountain building.
Our new zircon fission track data shows that the oldest of total reset age is ca 5-6 Ma that along the western flank
of the Hsihshan Range that identify that the initial stage of mountain building started from 6 Ma. We also found the
variation of denudation rate along the strike direction especially around the Puli Basin. Puli basin shows lower
topography along the Hsihahan Range. The total reset zircon fission track ages are ca. 6Ma around the Puli basin
that indicates a lower denudation rate contrast to the surrounding area. We supposed that this lower exhumation
rate could be controlled by subsurface structure or strength of the crust.
DE: 8102 Continental contractional orogenic belts and inversion tectonics
DE: 8104 Continental margins: convergent
DE: 8107 Continental neotectonics (8002)
DE: 8108 Continental tectonics: compressional
SC: Tectonophysics [T]
MN: 2007 Fall Meeting