Sedimentation and tectonics of Paleogene sediments in central Sarawak

Felix Tongkul. (1997) Sedimentation and tectonics of Paleogene sediments in central Sarawak. Bulletin of the Geological Society of Malaysia, 40. pp. 135-155. ISSN 2637-109X

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Abstract

The deposition of the Paleogene sediments in Central Sarawak occurred in four successive stages, its axis of depocentre generally advancing and younging to the northeast in response to progressive southwest subduction-accretion of a Mesozoic oceanic lithosphere and its sedimentary cover under West Sarawak. The younger sediments were deposited on top or in front of an older accreted sediments. The timing of deposition and accretion is uncertain due to lack of precise age indicators. However, based on regional considerations, the accretion is interpreted to have occurred sometimes during the Early Paleocene, Middle Eocene, Upper Eocene and Upper Oligocene, respectively, along major fault zones, producing four tectono-stratigraphic units. The older sediments were subjected to polyphase deformation as younger units were accreted.

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