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Paleoenvironment of Deposition of the Dupi Tila formation, Lalmai Hills, Comilla, Bangladesh


Affiliations
1 Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
2 Atomic Energy Commission, Savar, Dhaka, Bangladesh
3 Gas Seepage Control and Drilling Project, Bangladesh Gas Field Co. Ltd., Bakhrabad, B.Baria, Bangladesh
     

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The Dupi Tila Formation is composed of yellow to light brown medium to very fine moderately hard to loose sandstone, siltstone, silty clay, mudstone and shale with some conglomerates with clasts of petrified wood. The lithofacies of matrix supported conglomerate, trough cross bedded conglomerate, massive sandstone, trough cross bedded sandstone, planar cross bedded sandstone, ripple cross laminated sandstone-siltstone, flaser laminated sandstone-shale, lenticular laminated sandstone-siltstone-shale, parallel laminated sandstone-siltstone, wavy laminated shale, parallel laminated blue shale, and mudstone are delineated within this formation. Based on the grain size, sedimentary structures, water depth and genesis of individual facies, facies are grouped into three types of facies associations like (i) coarse-grained conglomerate facies association in relation to tractive current deposits of alluvial fan set up at the base of litho-succession (FAC), (ii) medium to fine-grained sandstone-siltstone-mudstone facies association or facies association in relation to strong tide (FAT) characterizing the middle part of litho-succession, (iii) very fine-grained sandstone-siltstone-mudstone facies association in relation to less frequent weak tide or heterolithic facies association (FAHL) characterizing upper part of litho-succession and shallow marine facies association (FASM) composing the uppermost litho-succession. Presence of gluconite indicates that the depositional environment was shallow to deep marine. The dominant paleoflow direction during the deposition of Dupi Tila Formation was toward southeast to southwestern direction. The rivers were of braided type at the piedmont alluvial depositional set up at the lower part, which later changed to estuarine-tidal flat type environmental set up in the middle part to upper part and paleo-environment was shallow marine in the uppermost part.

Keywords

Paleoenvironment, Dupi Tila Formation, Lalmai Hills, Comilla, Bangladesh.
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  • Paleoenvironment of Deposition of the Dupi Tila formation, Lalmai Hills, Comilla, Bangladesh

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Authors

Mrinal Kanti Roy
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Syed Samsuddin Ahmed
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Tapas Kumar Bhattacharjee
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Sultan Mahmud
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Md. Moniruzzaman
Atomic Energy Commission, Savar, Dhaka, Bangladesh
Md. Masidul Haque
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Sudip Saha
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh
Md. Ismail Molla
Gas Seepage Control and Drilling Project, Bangladesh Gas Field Co. Ltd., Bakhrabad, B.Baria, Bangladesh
Pulan Chandra Roy
Department of Geology and Mining, University of Rajshahi, Rajshahi - 6205, Bangladesh

Abstract


The Dupi Tila Formation is composed of yellow to light brown medium to very fine moderately hard to loose sandstone, siltstone, silty clay, mudstone and shale with some conglomerates with clasts of petrified wood. The lithofacies of matrix supported conglomerate, trough cross bedded conglomerate, massive sandstone, trough cross bedded sandstone, planar cross bedded sandstone, ripple cross laminated sandstone-siltstone, flaser laminated sandstone-shale, lenticular laminated sandstone-siltstone-shale, parallel laminated sandstone-siltstone, wavy laminated shale, parallel laminated blue shale, and mudstone are delineated within this formation. Based on the grain size, sedimentary structures, water depth and genesis of individual facies, facies are grouped into three types of facies associations like (i) coarse-grained conglomerate facies association in relation to tractive current deposits of alluvial fan set up at the base of litho-succession (FAC), (ii) medium to fine-grained sandstone-siltstone-mudstone facies association or facies association in relation to strong tide (FAT) characterizing the middle part of litho-succession, (iii) very fine-grained sandstone-siltstone-mudstone facies association in relation to less frequent weak tide or heterolithic facies association (FAHL) characterizing upper part of litho-succession and shallow marine facies association (FASM) composing the uppermost litho-succession. Presence of gluconite indicates that the depositional environment was shallow to deep marine. The dominant paleoflow direction during the deposition of Dupi Tila Formation was toward southeast to southwestern direction. The rivers were of braided type at the piedmont alluvial depositional set up at the lower part, which later changed to estuarine-tidal flat type environmental set up in the middle part to upper part and paleo-environment was shallow marine in the uppermost part.

Keywords


Paleoenvironment, Dupi Tila Formation, Lalmai Hills, Comilla, Bangladesh.

References