KONTROL SIRKULASI IKLIM DAN TEKTONIK TERHADAP ENDAPAN SEDIMEN SUNGAI PURBA BERUMUR PLISTOSEN DI DESA MULYASEJATI, KARAWANG DAN CILANGKAP, PURWAKARTA

Authors

  • H. Moechtar Pusat Survei Geologi
  • Subiyanto Subiyanto Pusat Survei Geologi

DOI:

https://doi.org/10.33332/jgsm.geologi.v21i2.136

Abstract

A study on the conglomeratic sandstone and siltstone unit (Qoa) in the Mulyasejati Village (Kabupaten Karawang) and Conglomeratic and tuffaceous sandstone unit (Qav) of Pleistocene age in the Cilangkap Village (Kabupaten Purwakarta) has been carried out. The objectives of this paper are to reconstruct the mechanism of Depositional Period Intervals (DPI) of each lithologic unit. Sedimentological and stratigraphical analyses were carried out in the field based on seven vertical measured section of 1:50 scales. The thickness of the sections range from 1.20 to 7.70 m. Based on the correlation, both of lithostratigraphic units belong to into fluvial systems, and can be divided into four DPI (A to D). The sedimentary facies pattern of each DPI is controlled by the thrust structure, and are shown by stacking channels (FAS) 1 to 4. Whereas, the vertical composition of sediment is controlled by the fluctuation humidity related to climate change following Milankovitch cycles. Changes in the colour and composition of the sediments of the fluvial systems during the depositional processes of DPI A-D, can be interpereted as the result of climate changes. The climate circulations starting from nearly climatic optimum to climatic minimum or even dry.


Keywords: facies, fluvial, climate, Interval of Deposition Periods

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References

Achdan, A., dan Sudana, D., 1992. Peta Geologi Lembar Karawang , Jawa, skala 1:100.000. Puslitbang Geologi, Bandung.

Blakey, R.C., and Gubitosa, R., 1984. Controls of sandstone body geometry and architecture in the Chinle Formation (Upper Triassic), Colorado Plateau. Sedimentary Geology, Vol. 38: 51-88.

Eberth, D.A., and Miall, A.D., 1991. Stratigraphy and evolution of a vertebrate-bearing, braided to anastomosed fluvial system , Cutler Formation (Permian-Pennsylvanian), north-central New-Mexico. Sedimentary Geology, 72 ( 3-4) : 225-252.

Finzel, S.F., and McCarthy, P.J., 2005. Architectural analysis of fluvial conglomerate in the Nunushuk Formation, Brook Range Foothills, Alaska; Preliminary interpretive report 2005-2, State of Alaska, Departement of Natural Resources: 18pp, 42005 bytes; http://www.dggs.alaska.gov./webpubs/dggs/pir/ text/pir.2005_002.PDF

Friend, P.F., Slater, M.J., and William, R.C., 1979. Vertical and lateral building of river sand-stone bodies, Ebbro, Basin, Spain. Journal Geol. Soc. London, 136 : 39-49.

Herail, G., Fornari, M., Viscarra, G., Laubacher, G., Argollo, J., and Miranda, V., 1989. Geodynamic and Gold Distribution in the Tipuani-Mapiri Basin (Bolivia). International Symposium on Intermontane Basins: Geology & Resources, Chiang Mai, Thailand (30 Januari – 2 Februari 1989) : 342-352.

Mader, D., 1985. Fluvial conglomerates in continental red beds of the Buntsandtein (Lower Triassic) in the Eifel (F.R.G.) and their palaeoenvironmental, palaeogeographical and palaeotectonic significance. Sedimenary Geology, vol. 44, Issues 1-2: 1-64.

Miall, A.D., 1978. Facies type and vertical profile models in braided river deposits: a summary. In: Miall, A.D. (Ed), Fluvial Sedimentology, Canadian Society of petroleum Geologist, Memoir 5 : 597-604.

Miall, A.D., 1985. Architectural-element analysis: a new method of facies analysis applied to fluvial deposits. Earth Science Review, 22 : 261-308.

Miall, A.D., 1996. The Geology of Fluvial Deposits: Sedimentary Facies, Basin Analysis, and Petroluem Geology. New York, Springer : 582pp.

Miall, A.D., 1992. Alluvial Deposits. In: Walker, R.G. and James, N.P. (Eds.), Facies Models response to sea level change. Geological Association of Canada : 119-142.

Miall, A.D., and James, N.P., 1992. Preface. In: Walker, R.G. and James, N.P. (Eds.), Facies Models response to sea level change. Geological Association of Canada.

Perlmutter, M.A., and Matthews, M.A., 1989. Global Cyclostratigraphy. In: Cross, T. A. (Ed.), Quantitative Dynamic Stratigraphy, Prentice Englewood, New Yersey: 233-260.

Reading, H.G., 1980. Characteristics and recognition of strike-slip fault systems. In: Balance, P.F. and Reading, H.G. (Eds.), Sedimentation in Oblique-slip Mobile Zones, Spec. Publ. Int. Assoc. Sediment. (1980) 4: 7-26.

Setiadi, D.J., 2001. Fluvial facies of the Citalang Formation (Pliocene-early Pleistocene), West Java, Indonesia. Journal of Geosience, Osaka City University, Vol. 44, Art. 11: 189-199.

Walker, R.G. dan James. N.P (1992) Preface. In: A.D. Miall and N.P. Jones (eds.), Facies models response to sea level change. Geological Association of Canada.

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Published

2011-04-10