HR: 0800h
AN: T11B-0369    [Abstracts]
TI: Folding and rotating of the southern Taiwan mountain range
AU: * Chang, C
EM: cpchang@csrsr.ncu.edu.tw
AF: CTR Space & Remote Sensing RES, Natl Central Univ, 300, Jungda RD, Chung-Li, 320 Taiwan
AU: Chang, T
EM: tychang@mail.ntou.edu.tw
AF: Institute of Applied Geosciences, Natl Taiwan Ocean Univ, 2, Pei-Ning Road, Keelung, 202 Taiwan
AU: Angelier, J
EM: angelier@obs-vlfr.fr
AF: Observatoire Oc‚anologique de Villefrance-G‚osciences Azur, Observatoire Oc‚anologique (UPMC), Villefrance/Mer, 06230 France
AB: In the Taiwan Island, the late Cenozoic collision of Eurasian Plate with the Luzon arc provides an opportunity to observe the arc-continent collision. However, many phenomena and structures recorded in the field demonstrate that the model of arc-continent collision is not sufficient for explaining the Taiwan Mountain building processes; for example, the rapid uplift and exhumation of the metamorphic rocks, the east-west trending fold-and-thrust systems in the southeastern Taiwan, the tectonic rotation of the Hengchun peninsula, the escape phenomenon in the Ilan and Pingtung Plains, etc.. All these are very difficult to be interpreted by using a "simple collision mechanism". In this paper we focus on the structural record of southern Taiwan mountain range, in order to clarify the process of deformation in the growing accretionary prism. In view of geological stratigraphy, the southern Taiwan is underlain by thick series of Miocene deposits, including dark gray argillites, flysch deposits with occasional interbeds of gray compact sandstone, and disseminated marly nodules. Lots of field works have been developed in this study to extract the tectonic stress of this region. The transpressional stress and structures are largely distributed in this area and afford us to measure particle deformation, which is an important key to reconstruct geotectonic history in situ of region. Finally, a new mountain building model is proposed to explain the recent deformation mechanism of Taiwan Island.
DE: 8104 Continental margins: convergent
DE: 8107 Continental neotectonics (8002)
DE: 8108 Continental tectonics: compressional
DE: 8118 Dynamics and mechanics of faulting (8004)
SC: Tectonophysics [T]
MN: Fall Meeting 2005