HR: 1330h
AN: T42B-0300    [PDF]
TI: Active Continental Growth During Transpressional Tectonics ­V Example from Southeastern Taiwan
AU: * Lu, C
EM: chia@ntu.edu.tw
AF: Department of Geosciences, National Taiwan University, 245, Choushan Road, Taipei, 106 Taiwan
AU: Chan, Y
EM: yuchang@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Taiwan, 128 Academia Road Sec. 2, Nankang, Taipei, 115 Taiwan
AU: Lee, J
EM: jclee@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Taiwan, 128 Academia Road Sec. 2, Nankang, Taipei, 115 Taiwan
AU: Chu, H
EM: chuht@linx.moeacgs.gov.tw
AF: Central Geological Survey, MOEA, 2. Lane 109, Hua-Hsin Street, Chung-Ho, Taipei, 235 Taiwan
AU: Malavieille, J
EM: malavie@dstu.univ-montp2.fr
AF: Lab. Geophysics, Tectonics, and Sedimentology,, Univ., Montpellier II, 4, PL E Bataillon, Montpellier, 34060 France
AB: Based on structural analysis and regional kinematics data from GPS measurements, we propose a tectonic evolution model for the active continental growth in the southeastern Taiwan. The deformation structures in the Miocene deposits of the southeastern Central Range exhibit characteristics of early-stage orogenic processes. These brittle-ductile deformation features indicate complex tectonic processes involved, including underthrusting, exhumation, and left-lateral transpressional movements. The observed deformation processes in the southeastern Central Range evidently combine together and interact within a single, complex framework. In the E-W transects across the Central Range, regional foliation orientations generally display a fan-shaped pattern with dips to the mountain core on both sides. In addition, kilometer-scale overturned structures were mapped at the eastern flank of the southern Central Range, the earlier foreland thrust and fold structures were largely overturned. This overall upward flower structure is consistent with an early-proposed exhumation and vertical accretion model. In general, the kinematics data suggest left-lateral transpressional tectonic movement is currently important process in the southeastern Taiwan. And under such tectonic movement, we highlight the contribution of the Luzon arc accretion to the continental growth of East Asia.
DE: 8000 STRUCTURAL GEOLOGY (New field, replaces single entry 8165)
DE: 8015 Local crustal structure
DE: 8100 TECTONOPHYSICS
DE: 8102 Continental contractional orogenic belts
DE: 8107 Continental neotectonics
SC: Tectonophysics [T]
MN: 2003 Fall Meeting