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Herman Darman
University of Aberdeen
Earth & Planetary Sciences

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Sedimentology of Coal Conglomerate Deposits within Channel Facies in Samarinda Region, East Kalimantan, Indonesia Herman Darman; Yahdi Zaim
Berita Sedimentologi Vol 5, No 1 (1997)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.228 KB) | DOI: 10.51835/bsed.1997.5.1.300

Abstract

Conglomerate beds with generally rounded to subrounded coal fragments are common in channel deposit facies in Samarinda Region (East Kalimantan), beds occur as interbeds within Balikpapan Formation. The coal fragments are possible transported and sedimented wood cuts or transported coal fragments from an older coal seam. This study compares the bed thickness with the diameter of the coal fragments and the other fragments. The cross plot of the bed thickness and grain size gives a better understanding of the sedimentation processes. Anomaly diameter of the coal fragments indicated wood fragments origin coals, also showed by the texture, the gradual changes of colour and the shape of the fragments. Small fragments (less than 1 cm) is hard to distinguish due to unclear texture and shape. There are two possibilities of the small coal fragments origins, coal clastics or small high density wood cuts. Coal fragments characteristics in conglomerate beds and typical Gp and Sp facies characteristics show that the coal fragment were deposited in a point bar controlled by a flooding process and the Gms facies was deposited in proximal channels.
Mahakam River Drainage Basin: The Sediments Source of the Mahakam Delta Herman Darman; Deddy Hadriyanto
Berita Sedimentologi Vol 5, No 1 (1997)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (459.363 KB) | DOI: 10.51835/bsed.1997.5.1.301

Abstract

The Mahakam River is located in East Kalimantan (Borneo), Indonesia, recognized as a good example of a mixed fluvial and tide-dominated delta. The river supplies sediments to Makassar Strait basin and has built a major delta systems at its mouth. The delta plain consists of predominantly fine grained sediments, provided by the fluvial system.The Mahakam river drainage basin drains the Kutai Tertiary basin. The drainage basin is bounded by the Tertiary uplift in the east, Mangkaliat ridge in the north, and the Kuching High in the west. The northeast-southwest Tertiary ridges separate the drainage basin from the sea. Centripetal, trellis and deranged drainage patterns occur in the basin.Erosion processes are intensive in this area, due to the tropical heavy rain fall. The fluvial system is also influenced by vegetation, evapotransporation rate and tide. The Kutai Lakes Complex occurrence in the drainage basin and the high evapotransporation potential affects the sediment supply for the Mahakam Delta. Sediments supplied by the basin consist of predominantly quartz sandstone, shale and organic material. Sedimentological processes in the fluvial system are very active. The Kutai Lakes and the high evapotransporation potential of the area influence the sediment supply for the Mahakam Delta.
Co-Authors Deddy Hadriyanto Yahdi Zaim