PALYNOLOGICAL INVESTIGATION OF THE OLIGOCENE SEDIMENT IN EAST JAVA SEA
Abstract
The palynological study of the Oligocene sediments is based on cutting samples collected from the exploration wells which are drilled in East Java Sea. The occurrence of pollen Meyeripollis naharkotensis along the well sections suggests the pollen zone of Meyeripollis naharkotensis which is equivalent to Oligocene age. This is supported by the regular occurrence of the Oligocene marker of the trilete spore of Cicatricosisporites dorogensis along the studied well sections. In addition, foraminiferal and nannoplankton analyses confirm the Oligocene age by identifying the occurrence of letter stage of Tc- Te4 and nanno zone of NP21-NP25. On the other hand, most palynomorphs marking Eocene age disappear from the studied wells as they are stratigraphically older than the studied sediments. Unlike the Oligocene sediment of West Java and Central Sumatra which was formed in the freshwater swamp or lake under dry climate condition, the studied sediment was deposited in the transition to shallow marine environment as indicated by the moderate diversity of marine dinoflagellates coupled with the frequent occurrence of limestone along the sections. Furthermore, the regular appearance of back-mangrove pollen of Spinizonocolpites echinatus throughout the well sections supports the indication of marine influence. The appearance of the Australian immigrants including Dacrydium (common occurrence) and Casuarina (regular occurrence) may indicate earlier arrival of the Australian continent in this area compared to that in other areas of Indonesia.
Keywords
Full Text:
PDFReferences
Hall, R. 1998. The Plate Tectonic of Cenozoic
SE Asia and the Distribution of Land and Sea.
In: Hall, R. and Holloway, J. (eds.), Biogeography
and Geological Evolution of SE Asia,
Backhys Publisher, Amsterdam, pp. 99 - 132.
Haq, B. U., Hardenbol, J., Vail, P. R. and Baum,
G. R. 1998. Mesozoic and Cenozoic
Chronostratigraphy and Eustatic Cycles. In:
Wilgus, C. K., Hastings, B. S., Posamentier, H.
and Van Magoner, J. (eds.), Sea Level Change:
an Integrated Approach, Society of Economic
Palaeontologists and Mineralogists Special Publication
, pp. 71 - 108.
Lelono, E. B., 2000. Palynological Study of the
Eocene Nanggulan Formation, Central Java,
Indonesia. Unpublished PhD Thesis. University
of London.
Lelono, E. B. 2001. Revisi Zonasi Polen Eosen.
Lembaran Publikasi Lemigas, vol. 35, no. 1, pp.
-26.
Lelono, E. B. 2003. Tropical Eocene Palynomrphs
from the Toraja Formation, Kalumpang, South
Sulawesi. Lemigas Scientific Contributions, No.
, pp. 8-23.
Lelono, E. B. 2005. Penelitian Palinologi pada
Sedimen Paleogen di Kawasan Indonesia Bagian
Barat. Lembaran Publikasi Lemigas, Vol. 39,
No. 2, pp. 15-23.
Morley, R. J. 1977. Floral Zones Applicable to
Neogene of Eastern Kalimantan. Unpublished
Service Report. pp. 1-5.
Morley, R. J. 2000. Origin And Evolution Of
Tropical Rain Forests. Wiley, London.
Muller, J. 1972. Palynological Evidence for
Change in Geomorphology, Climate and Vegetation
in the Mio-Pliocene of Malesia. In: Ashton,
P. S. and Ashton, M. (eds), The Quaternary Era
in Malesia. Geography Department, University
of Hull, Miscellaneous Series 13, pp. 6 – 34.
Rahardjo, A. T., Polhaupessy, A. A., Wiyono, S.,
Nugrahaningsih, L. and Lelono, E. B. 1994. Zonasi
Polen Tersier Pulau Jawa. Proc. IAGI, 23rd Annual
Convention.
Smyth, H., Hall, R., Hamilton, J. and Kinny, P.
Volcanic Origin of Quartz-Rich Sediment
in East Java. Proceeding Indonesian Petroleum
Association, 29th Annual Convention and Exhibition,
Jakarta.
Sribudiyani, Muchsin, N., Ryacudu, R., Kunto, T.,
Astono, P., Prasetya, I., Sapiie, B., Asikin, S.,
Harsolumakso, A. H. and Yulianto,I. 2003. The
Collision of the East Java Microplate and Its Implication
for Hydrocarbon Occurrences in the East
Java Basin. Proceeding Indonesian Petroleum
Association, 29th Annual Convention and Exhibition,
Jakarta.ˇ
DOI: https://doi.org/10.29017/SCOG.30.1.970
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Indexed On :
