Lack of Compressional Overprint on the Extensional Structure in Offshore Tainan and the Tectonic Implications

Abstract

The nature of the plate boundary between the Eurasian and Philippine Sea Plates changes from subduction to collision along the northern extension of the Manila Trench, north of 21 degree N, offshore southwest Taiwan. To determine whether the collision-formed deformation front passes through the Tainan Basin, a region of petroleum interest, seismic profiles that cross a proposed ¡§deformation front¡¨ are interpreted. However, only a major normal fault, that is a growth fault that forms the northwestern side of a tilted horst structure can be positively identified. The nature of this normal faulting is also supported by the modeling of gravity and magnetic data.

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