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All Journal Jurnal Geologi dan Sumberdaya Mineral Scientific Contribution Oil and Gas Lembaran Publikasi Minyak dan Gas Bumi
Eko Budi Lelono, Eko Budi
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Journal : Jurnal Geologi dan Sumberdaya Mineral

 1 
Palynology of the Permian Freshwater Deposit in West Timor Lelono, Eko Budi
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 4 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (10011.908 KB)

Abstract

The Permian sediment is considered to be the oldest formation which occurs in West Timor. It derived from Australian continent which was collided in Late Neogene with the Banda volcanic arc in the Timor Island due to northward moving of this continent. It consists of carbonate (limestone) of Maubise Formation and clastic sediment of Bisane Formation (equivalent to Cribas and Atahoc Formations). This study focusses on the Bisane Formation which lithologically comprises thick calcareous sandstone (0.3 - 5 meters) with abundant marine macrofossils of Chrinoid and common mica. These facts suggest that the Bisane Formation was deposited during Permian age in the shallow marine environment. This interpretation supports the previous study to define shallow marine environment for the Permian sequence. However, this study found different lithology of the Bisane Formation in some locations which is composed of the intercalation of noncalcareous, dark gray to black shale and siltstone showing papery structure and rich of sulphur. Seven shale samples were collected randomly due to outcrop limitation. Stratigraphic range and paleoenvironment of key palynomorphs refer to some authors including Traverse (1988), Brugman et al. (1985), Feng et al. (2008), Jan (2014) and Jha et al. (2014). This paper reveals the result of palynological investigation performed on the noncalcareous black shales of the Bisane Formation. Palynological assemblage characterises Permo - Triassic age as indicated by the existence of striate-bisaccate pollen including Protohaploxypinus samoilovichii, P. fuscus, P. goraiensis, Striatopodocarpidites phaleratus, Pinuspollenites globosaccus and Lunatisporites pellucidus. However, the appearance of trilete-monosaccate spores of Plicatipollenites malabarensis and Cannanoropollis janakii defines that the mentioned shales have an age of Permian. The recovered pollen and spores are associated with the freshwater environment as supported by the disappearance of marine dinoflagellates and noncalcareous lithology. Considering tectonic event during Perm which is marked by rifting, it is possible that the analysed sediment is a product of early syn-rift sedimentation as proved by the occurrence of freshwater deposit (probably lacustrine deposit). If this is the case, the appearance of Permian black shale samples provides opportunity to discover new petroleum system in the Paleozoic sedimentary series of West Timor. KEY WORDSPalynology, Permian, Freshwater Sediment, West Timor
Perkembangan Fasies Sedimen Formasi Mamberamo Berumur Miosen Akhir-Pliosen di Cekungan Papua Utara Mamengko, David Victor; B.Sendjadja, Yoga; Mulyana, Budi; Panggabean, Hermes; Haryanto, Iyan; Lelono, Eko Budi; Musu, Juwita Trivianty; Panuju, Panuju
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 1 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (310.459 KB) | DOI: 10.33332/jgsm.geologi.20.1.37-47

Abstract

North Papua Basin is a fore arc basin located in northern coastal of Papua Island. This basin filled by Middle-Upper Miocene turbidite sediment and overlied by Upper Miocene – Quarternary clastic sediment. Upper Miocene – Quaternary clastic sediments (Mamberamo Formation) composed by interbedding conglomerate, sandstone and shale as molasses deposit. A detailed stratigraphic study was performed to identify facies and its association of the Mamberamo Formation to that give a new perspective on the characteristics and development of facies succession of Lower Mamberamo Formation. Result  shows that the Lower Mamberamo Formation consists of three facies: A) cross bedding sandstone (subtidal), B) heterolothic silty shale (intra-tidal), C) carbonaceous shale (supra-tidal) deposited on Late Miocen to Plio-Pleistocene during centra range orogeny (syn-orogeny) as molasses deposits.Keywords: Fore arc basin, North Papua Basin, Mamberamo Formation, molasse deposits.
Co-Authors Abd. Rasyid Syamsuri Ali Djamhuri B.Sendjadja, Yoga Christina Ani Setyaningsih, Christina Ani David Victor Mamengko dedi kurniadi Firdaus, Iskandar Hermes Panggabean Iyan Haryanto, Iyan Morley, Robert J Musu, Juwita Trivianty Ningsih, L Nugraha Nugrahaningsih, L Nugrahaningsih, L. Panuju Panuju Sunarjanto, Djoko Tatang Padmawidjaja, Tatang Wibowo, Andy Setyo