Pollen and Foraminifera Approaches to Identify Sediment Sources In The River Mouth Mahakam East Kalimantan
The central role of Mahakam River in the construction of Mahakam Delta is to supply sediment from terrestrial to the river mouth. The river upstream comes from Mount Camaru and the downstream part terminate at Makasar Strait. The surrounding area of the river is overgrown by wet tropical flora that produces pollen. The existence pollen in river sediments as an indicator that sediment came from terrestrial, and foraminifera as an indicator that sediment came from marine. The ratio changes of pollen to foraminifera show that there were differences of sediment source supply. The study was conducted at the river mouth. A shallow core, 200 cm depth, composed of sand and mud and sandy mud, from it taken vertically 11 samples to be analyzed pollen and foraminifera. Sample preparation was using standard methods acetolysis. Meanwhile, sample preparation of foraminifera using Hydrogen Peroxide method. Pollen found at all samples, but foraminifera only found in 8 samples. The data indicating that sedimentation process in the mouth of a river not only gets sediment supplies from terrestrial but also from marine. The quantity of pollen and foraminifera varies vertically. The frequency of pollen much higher than foraminifera that indicates of source sediments dominance came from terrestrial which carried by Mahakam river current. Sonneratia caseolaris pollen continuously found in all samples. Stictogongylus vandiemensis is species foraminifera the most common that followed by Ramulina confossa, both of them come from the sea particularly from the shallow sea.
https://www.britannica.com/place/Borneo-island-Pacific- Ocean, Access 1/3/16
Galloway, W.E. (1975) Process framework for describing the morphologic and stratigraphic evolution of deltaic depositional systems. In: Deltas, Models for Exploration (Ed. M.L. Broussard), pp. 87–98. Houston Geological Society, Houston, TX
Grimsdale.T.F; Van Morkhoven, F.P.C.M (1955). The ratio between pelagic and benthonic foraminifera as a means of estimating the depth of deposition of sedimentary rocks. - Proceedings of 4th World Petroleum Congress, Section I/D4, 473-491
Hidayat,H;Vermeulen1, B; Sassi1, M. G; Torfs; P. J. J. F. and Hoitink, A.J.F, 2011. Discharge estimation in a backwater affected meandering river, HESS, 15, 2717-2728
Lovett, J.C., Marchant, R., Marshall, A.R., Barber, J. (2007). Direct evidence for change. In:
R. Hesler,R.E , and Harrison, R.M (eds.) Biodiversity Under Threat. Royal Society of Chemistry.
National Geography: http://nationalgeographic.org
Stuijts,.I.,1933. Late Pleistocene And Holocene Vegetation Of West Java, Indonesia. Modern Quarternary Research in Southeast Asia, Vol 12, Rotterdam: A.A. Balkema
Tipsword, H. L., F. M. Setzer, and F. L. Smith, Jr., 1966, Interpretation of depositional the environment in Gulf Coast petroleum exploration from paleoecology and related stratigraphy: Transactions of the Gulf Coast Association of Geological Societies, vol. 16, p. 119–130.
Winantris,W; Sudradjat, A; Hirnawan, F and Syafri,I; 2013. Distribution and Diversity Pollen and Spore, In Recent Mahakam Delta, East Kalimantan. SAGE Berlin
Whitmore, T. C. 1975. Tropical Rain Forests of the far East. Clarendon Press, Oxford
Lambert, Bernard. 2002. Micropaleontological investigation in the modern Mahakam delta,
East Kalimantan (Indonesia). Carnets de Geologie/Notebooks on Geology, Maintenon, Article 2003/02 (CG 2003_AO2_BL), 21 h.
Loeblich, JR., Alfred, R and Hellen Tappan. 1994. Foraminifera of The Sahul Shelf And
The Timor Sea. Department of Earth and Space Sciences, University of California, Los Angeles, California, 661 h.
Salahuddin and Lambiase, J.J. 2013. Sediment Dynamics and Depositional Systems of The Mahakam Delta, Indonesia: Ongoing Delta Abandoment On A Tide-Dominated Coast. Journal of Sedimentary Research, v.83, p. 503-521
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