Bulletin of the Geological Society of Malaysia, Volume 62, December 2016, pp. 37 – 45
Geosciences Department, Faculty of Geosciences & Petroleum Engineering,
Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia
*Corresponding author: firstname.lastname@example.org
Abstract: The Paleozoic limestone of Kinta Valley formed a narrow deformed strip between the Late Triassic – Early Jurassic batholiths of the northern Peninsular Malaysia. Because of the advanced stage of karstification, it is difficult to understand the deformation events that affected the limestone. We use outcrop remote sensing mapping, outcrop examples and hand specimens to unravel the tectonic evolution from syn-sedimentary to Recent events. We identify (i.) an early extensional event marked by very penetrative micro-normal faults, possibly due to compaction underneath the sea bottom, which occurred when bedding was still horizontal, (ii.) an early compression indicated by a set of conjugate originally strike-slip faults, (iii.) a well-marked compression with thrusts and tight folds which tilted the previously formed structures, (iv.) ductile high temperature (HT) normal shear located near the contact with the granites, and (v.) late extensional event marked by subsequent large normal faults. We interpret the evolution as intra-basin extension during Permian-Triassic times followed by a continuum of high strain coeval with the late stages of granite emplacement including compression and gravitational extension on the edge of the intrusion. The late extension is undated but may be linked to the Tertiary basins formation of Malaysia or the Late Miocene to Quaternary uplift.
Keywords: structural geology, limestone, Kinta Valley