A contribution to the geology of part of the Indonesian tin belt: the sea areas between Singkep and Bangka Islands and around the Karimata Islands

Aleva, G. J. J and Bon, E. H. and Nossin, J. J. and Sluiter, W. J. (1973) A contribution to the geology of part of the Indonesian tin belt: the sea areas between Singkep and Bangka Islands and around the Karimata Islands. Bulletin of the Geological Society of Malaysia, 6. pp. 257-271. ISSN 2637-109X

Abstract

An acoustic continuous profiler survey over extensive sea areas between Singkep and Bangka and around the Karimata Islands, supplemented by sea drillings, indicates the following sedimentary succession: below the sea, the basement, which on the islands consist of folded sediments and granitic rocks, is covered by unconsolidated sub-horizontal, mostly sandy sediments with intercalated peat layers near the top, probably of Tertiary age. Next a sequence of sediment-filled gullies incised into the older sediments and sometimes also into the basement is present. Again, peat layers are of common occurrence, indicating a terrestrial origin for most of these sediments; at least part of these deposits seems to be of young Tertiary age. An extensive, nearly horizontal planation surface is found at depths of 20-30 m below sea level. This surface is at remarkably constant depth and very flat, indicating a marine origin. Spotty red clay is present on part of this surface, indicating a temporary emergence of the abraded surface. A young sedimentary deposit, mainly of marine origin, represents the latest postglacial transgression. Part of its material is derived from the surrounding islands.

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