The geological features of the Coastal Range of eastern Taiwan are characterized by occurrence of Cenozoic ophiolite suites, development of a tectonic mélange and existence of active left-lateral slip faulting. These are typical features found to occur in mobile belts such as island arcs and continental margins. From the review of the local geology, its comparison with that of the Franciscan assemblage and its combination with many available geophysical and oceanographic data related to the western Philippine Sea region, it is possible to construct a tectonic model for the development of the observed geologic features. The concept of plate tectonics has been applied in this model and it offers a better explanation for the evolution of the tectonic mélange.

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