A Contribution to the Geology of Part of the Indonesian Tinbelt: the Sea Areas Between Singkep and Bangka Islands and Around the Karimata Islands

Author : G. J. J. Aleva, E. H. Bon, J. J. Nossin & W. J. Sluiter
Publication : Bulletin of the Geological Society of Malaysia
Page : 257-271
Volume Number : 6
Year : 1973
DOI : https://doi.org/10.7186/bgsm06197316

Bulletin of the Geological Society of Malaysia, Volume 6, Jul, 1973, pp. 257 – 271

A Contribution to the Geology of Part of the Indonesian Tinbelt: the Sea Areas Between Singkep and Bangka Islands and Around the Karimata Islands


1Billiton International Metals B.V., The Hague, Netherlands

2International Institute for Aerial Survey and Earth Sciences (L.T.C), Enschede, Netherlands

3Formerly Billiton N.V., The Hague, Netherlands


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.