Depositional Cycles of Muara Wahau Coals, Kutai Basin, East Kalimantan

Komang Anggayana, Basuki Rahmad, Agus Haris Widayat

Abstract


http://dx.doi.org/10.17014/ijog.v1i2.183

Fifteen samples were taken ply by ply from a 33 m thick drill core of Muara Wahau coal seams for interpretation of depositional environments. Generally, lithotype variation in the bottom part of the coal seams has a lower frequency than in the upper part. Petrographical analysis was performed to determine the maceral composition, groundwater index (GWI), and gelification index (GI). The samples from lower sections show much higher GWI-GI values and lower variation frequency than from the upper section. This characteristic is interpreted as the result of development of mesotrophic to ombrotrophic peats during the deposition of lower to upper parts of the section, respectively. During the development of the mesotrophic peat, water was more abundant and relatively stable in budget. However, during the development of ombrotrophic peat, water was less abundant and relatively not stable in budget. The latter is related to the water supply depending only on rain, resulted in the more sensitive water table in the om- brotrophic peat. The unstable water table is thought as the reason of higher variation frequency of lithotype, GWI, GI, as well as maceral composition in the upper part of the core. Unstable water table would lead to moist condition in the uppermost layer of the ombrotrophic peat, favoring fungi to grow. This is confirmed by the higher abundance of sclerotinite maceral in samples from the upper part of the coal core.


Keywords


coal seam facies; Muara Wahau; Kutai Basin

References


Bustin, R.M., Cameron, A.R., Grieve, D.A., and Kalkreuth, W.D., 1983. Coal Petrology - Its Principles, Methods, and Applications. Short Course Notes, 3. Geological Association of Canada, Victoria.

Calder, J.H., Gibling, M.R., and Mukhopadhay, P.K., 1991. Peat formation in a Westphalian B piedmont setting, Cumberland basin, Nova Scotia: implications for the maceral-based interpretation of rheotrophic and raised paleomires. Bulletin de la Societe Geologique France, 162, p.283-298.

Calvert, S.J., 1999. The Cenozoic Evolution of the Larlang and Karama Basin, Sulawesi, Proceedings of IPA 28th Annual Convention, p.97- 115.

Crosdale, P.J., 1995. Coal facies studies in Australia. International Journal of Coal Geology, 58, p.125-130. doi:10.1016/j.coal.2003.10.004

Diessel, C.F.K., 1965. Correlation of macro and micropetrography of some New South Wales coals. In: Woodcock, J.T., Madigan, R.T., and Thomas, R.G. (eds.), Proceedings-General, 8th Commonwealth Mineral and Metallurgy Congress, 6, p.669-677.

Diessel, C.F.K., 1986. On the correlation between coal facies and depositional environment, Advances in the Study of the Sydney Basin. Proceedings of the 20th Symposium- The University Newcastle-Department of Geology, Publication, 246, p.19-22.

Esterle, J.S. and Ferm, J.C.,1994. Spatial variability in modern tropical peat deposits from Sarawak, Malaysia, and Sumatra, Indonesia: analogues for coal. International Journal of Coal Geology, 26, p.1-41. doi:10.1016/0166-5162(94)90030-2

ICCP (International Committee for Coal Petrology), 1998. The new vitrinite classification (ICCP System 1994). Fuel, 77, p.349-358. doi:10.1016/S0016-2361(98)80024-0

ICCP (International Committee for Coal Petrology), 2001. The new inertinite classification (ICCP system 1994). Fuel, 80, p.459-471. doi:10.1016/S0016-2361(00)00102-2

ICCP (International Committee for Coal Petrology), 2011. Organic petrology, macerals, microlithotypes, lithotypes, mineral, rank. ICCP Training Course on DOM, Universidade do Porto, Portugal.

Lamberson, M.N., Bustin, R.M., and Kalkreuth, W., 1991. Lithotype (maceral) composition and variationas correlated with paleowetland environments, Gates Formation, northeastern British Columbia. International Journal of Coal Geology, 18, p.87-124. doi:10.1016/0166-5162(91)90045-K

Stopes, M.C., 1919. On the four visible ingredients in banded bituminous coals. Proceed- ings of Royal Society, 90B, p.470-487. DOI: 10.1098/rspb.1919.0006

Suárez-Ruiz, I. and Crelling, J.C. (eds.), 2008. Applied Coal Petrology. The Role of Petrology in Coal Utilization. Elsevier Ltd, 388pp. 10.1007/s12594-009-0181-y

Supriatna, S. and Abidin, Z.A., 1995. Geological Map of Muara Wahau Sheet, Scale 1:250.000. Geological Research and Development Centre, Bandung.

Sykorova, I., Pickel, W., Christanis, K., Wolf, M., Taylor, G.H., and Flores, D., 2005. Classification of huminite ICCP System 1994. International Journal of Coal Geology, 62, p.85-106. doi:10.1016/j.coal.2004.06.006

Taylor, G.H., Teichmuller, M., Davis, A., Diessel, C.F.K., Littke, R., and Robert, P., 1998. Organic Petrology. Gebruder Borntraeger. Berlin . Stuttgart. 704pp.

Thomas, L., 2002. Coal Geology. John Wiley & Sons Ltd, England, 384pp.


Full Text: PDF

Refbacks

  • There are currently no refbacks.


Creative Commons License
Indonesian Journal on Geoscience by https://ijog.geologi.esdm.go.id/index.php/IJOG/index is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

 

Indexing Site :

 

 

 

Follow us on:


shopify visitor statistics
View My Stats