Cristina, B., A. M. Joaquina, B. Dennis, and K. C. Hao The structure of southwest Taiwan: the development of a fold‐and‐thrust belt on a margins outer shelf and slope, Tectonics, 0(ja), doi: doi:10.1029/2017TC004910.
The southwest Taiwan fold‐and‐thrust belt is forming on the outer shelf and slope of the Eurasian continental margin. It comprises a roughly N‐S striking, west‐verging imbricate thrust system that has been developing since the Late Miocene. Here, we present the results of new surface geological mapping from which we construct balanced and restored cross sections and along‐strike sections. From these we compile maps of the basal thrust, thrust branch lines and, where possible, stratigraphic cut‐offs. To interpret the structure in the subsurface and beneath the basal thrust, we use a P‐wave velocity of 5.2 km/s as a proxy for the top of the Mesozoic basement. We divide the southwest Taiwan fold‐and‐thrust belt into a number of thrust sheets that form the basis of our description and interpretations. From these data we interpret the 3D structure of the fold‐and‐thrust belt and the influence that the structure and morphology of the continental margin is having on its development. We show that there is a significant along‐strike change in the structure. This change takes place across a transverse zone that is comprised of a suite of structures at the surface. We suggest that this transverse zone has a causal relationship with variations in the geometry of the basal thrust which in turn is related to (possibly fault bounded) basement highs and lows that are inherited from the continental margin.