Bulletin of the Geological Society of Malaysia, Volume 31, July 1992, pp. 133 – 143
Petroleum Research Institute, PETRONAS, 54200 Ulu Kelang, Selangor.
Abstract: The basement of the Tenggol Arch is penetrated by PETRONAS Carigali well Malong 5G-17.2, located 150 km off the east coast of Terengganu. Cores from the basement, at 1,582 m subsea, consists of highly fractured porphyritic rhyolite in sharp contact with a dolerite dyke. Overlying the rhyolite is a lower Miocene conglomerate composed of rhyolite and granophyre clasts. The granophyre clasts were presumably derived from a granophyric basement subcrop in the vicinity. The dolerite dyke in Malong well occurring at the edge of the Malay Basin may have been intruded during incipient rifting of the basin during the early Cenozoic.