Palynology of the Permian Freshwater Deposit in West Timor
DOI:
https://doi.org/10.33332/jgsm.geologi.v17i4.18Abstract
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.
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KEY WORDS
Palynology, Permian, Freshwater Sediment, West Timor
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References
Brugman, W. A., Eggink, J. W., Loboziak, S. and Visscher, H. 1985. Micropalaeontology. 4 (1), pp. 93 – 106.
Chamalaun, F. H. and Grady, A. E. 1978. The Tectonic Development of Timor. A New Model and its Implications for Petroleum Geology. APEA Journal 18, pp. 102-108
Charlton, T. R. and Gandara, D. 2012. Structural-Stratigraphy Relationships at the Boundary of the Lolotoi Metamorphic Complex, Timor Leste: Field Evidence Againts an Allochtonous Origin. 1st International Geology Congress of Geology of Timor Leste, Dili.
Charlton, T. R. 2002. The Petroleum Potential of West Timor. Proceedings of the Indonesian Petroleum Accosiation 30.
Elnusa, 2015. Survey, Processing and Interpretation of Geological and Geophysical Data of the Atambua Area and its Vicinity, West Timor. Lemigas Internal Report.
Feng, L., Huaicheng, Z. and Shu. O. 2008. Late Carboniferous – Early Permian Palynology of Baode (Pao-Te-Chou) in Shanxi Province, North China. Geol. J. 43, pp. 487-510.
Hall, R. 2013. The Paleogeography of Sundaland and Wallacea Since the Late Jurassic. J. Limnol., 72 (s2), pp. 1-17.
Hamilton, W. 1979. Tectonics of the Indonesian Region. U.S. Geological Survey Professional Paper 1078.
Harris, R. A. 1991. Temporal Distribution of Strain in the Active Banda Orogen: A Reconciliation of Rival Hypotheses. Journal of Southeast Asian Earth Sciences 6, pp. 373-386.
Harris, R.A., 2011. The Nature of the Banda Arc Continent Collision in the Timor Region. Arc Continent Collision. Springer, pp. 163-211.
Helby, R., Morgan, R. and Partridge, A. D. 1987. A Palynological Zonation of the Australian Mesozoic. In: Jell, P. A. (ed), Studies in Australian Mesozoic Palynology. The Association of Australian Paleontologists, Sydney, pp. 1-94.
Jan, I. 2014. Progress in the Gondwanan Carboniferous - Permian Palynology and Correlation of the Nilawahan Group of the Salt Range, Pakistan: A Brief Review. Journal of Earth System Science 123, No. 1, pp. 21-32.
Jha, N., Aggarwal, N. and Shivanna, M. 2014. Late Permian Palynology and Depositional Environment Chintalapudi Sub-basin, Pranhita – Godavari Basin, Andhra Pradesh, India. Journal of Asian earth Sciences 79, pp. 382-399.
Lelono, E. B., 2001. Obtaining the Suitable Techniques for Palynological Preparation. Lemigas Scientific Contribution, no. 2/ 2001, pp. 2-6.
Lelono, E. B., Nugrahaningsih, L., Kurniadi, D., Suandhi, P. A. and Utomo, B. H. 2016. Palynological Investigation of the Permian Sediment in the On-shore West Timor. Proceeding of the 14th Geosea and the 45th Indonesian Geologist Accosiation Annual Convention. In-press.
Rosidi, H. M. O., Suwitopiroyo, K. and Tjokrosapoetro, S. 1979. Geological map Kupang - Atambua Quadrangle, Timor 1:250.000. Geological Research and Development Centre, Bandung, Indonesia
Sawyer, R. K., Sani, K. and Brown, S. 1993. Stratigraphy and Sedimentology of West Timor, Indonesia. Proceedings of the Indonesian Petroleum Accosiation 22, pp. 1-20.
Traverse, A. 1988. Paleopalynology. Unwin Hynman, Boston, 600 p.
Van Gorsel, J. T. 2014. An Introduction to Paleozoic Faunas and Floras of Indonesia. Berita Sedimentologi 31, pp. 6-26.
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