Abstract

In the Kaohsiung area (SW Taiwan), large lenses of Pleistocene reef limestones interbedded in clastic layers of the Gutingkeng Formation cover the crest of the Takangshan and Panpingshan anticlines. Tectonic analyses carried out on these limestones provide evidence that these anticlines developed during deposition of the reefs. This is supported by synsedimentary normal faulting related to tensional stresses at the hinge of the anticlines. This synsedimentary extension is subperpendicular to the local trends of fold axes and parallel to the compression responsible for fold development and which is mainly marked by strike-slip faults. These observations lead us to propose a model of extension-compression relationships and reef development during Quaternary folding in the foreland of the Taiwan collision belt.

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