Seismic stratigraphy and structural geology of Tainan basin
Speaker:?Chuang, Chieh-wei
Date:2012/12/20Abstract
The Tainan Basin is one of the set of Cenozoic extensional basins along northern margin of the South China Sea that experienced extension and subsequently thermal subsidence. The Tainan Basin is close to the Taiwan Arc-Trench System and straddles a transition zone between oceanic and continental crust. A new regional multi-channel seismic profile (973-01) across the region of NE South China Sea is introduced in this paper. In seismic stratigraphy and structural geology, a model of Cenozoic tectono-sedimentation of the Tainan Basin is established.
Swath bathymetry data and seismic reflection profiles have been used to investigate details of the deformation pattern in the area offshore southwestern Taiwan where the Luzon subduction complex encroaches on the passive Chinese continental margin. Distinctive fold-and-thrust structures of the convergent zone and horst-and-graben structures of the passive margin are separated by a deformation front that extends NNW-ward from the eastern edge of the Manila Trench to the foot of the continental slope. We suggest that the deformation front offshore SW Taiwan does not appear as a simple structural line, but is characterized by a series of N–S trending folds and thrusts that terminate sequentially in an en-echelon pattern across the passive Chinese continental slope.
References
Char-Shine Liu, Benoit Deffontaines, Chia-Yu Lu and Serge Lallemand, 2004, Deformation patterns of an accretionary wedge in the transition zone from subduction to collision offshore southwestern Taiwan.Marine Geophysical Researches (2004) 25:123–137
Wei-wei DING, Jia-biao LI, Ming-bi LI, Xue-lin QIU, Yin-xia FANG, Yong TANG, 2008, A Cenozoic tectono-sedimentary model of the Tainan Basin, the South China Sea: evidence from a multi-channel seismic profileJournal of Zhejiang University SCIENCE A