Abstract:
Mixed carbonate-siliciclastic Permian rocks of Saraburi Group are well exposed in the Siam City Cement quarry. These rocks formed during Late Carboniferous to Permian with development of Khao Khwang Platform along the southwestern margin of Indochina terrane. Structural complexity in this region occurred when palaeotethys subducted beneath the Indochina terrane causing NW-SE striking Khao Khwang Fold and Thrust Belt as part of the Indosinian Orogeny. This study investigated the quarry and integrated traditional field data with photorealistic digital outcrop models in order to construct a detailed structural map. According to palaeo-stress analysis, the structural evolution can be divided into two stages of deformation. First, ENE-WSW compression formed the fold and thrust system. The second stage related to NNE-SSW extension which formed obliquenormal fault along the northeastern portion of the study area which lies in the NW-SE direction.
