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Sediment Composition of the Thakuran River Basin of the Sunderbans


Affiliations
1 Department of Chemical Engineering, Jadavpur University, Kolkata– 700 032, India
 

Thakuran River sediments are typical estuarine. Lithogenic constituents are dominant with about 85-90% in bulk and biogenic components constitute the rest (10-15%). Quartz, feldspars, mica, lithic fragments and some heavy minerals are the main terrigenous constituents. Secondary overgrowth of quartz with multiple rims of inclusions suggests their derivation from sedimentary rocks of different cycles of sedimentation. The heavy mineral assemblage in the sediments lead to conclude that the sediments have been derived from the acid igneous rocks of the Himalayas in the north and the metamorphic rocks of the Precambrian shields of the west and north-west of Bengal Basin. Benthic foraminiferal assemblage indicates a shallow water, moderate to low salinity environment of deposition.

Keywords

Lithogenic Components, Biogenic Components, Heavy Minerals, Acid Igneous Minerals, Metamorphic Sources, Sedimentary Rocks, Thakuran River, Sunderbans.
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  • Das, G.K., Estuarine Morphodynamics of the Sunderbans, Coastal Research Library, Vol. 11, Springer, Switzerland, p.211, 2015.

  • Griffiths, J.C., Scientific Method in Analysis of Sediments, McGraw Hill Book Company, p.508, 1967.

  • Jansen, J.H.J. and Hensey, A.M., Interglacial and Holocene sedimentation in the northern North Sea: an example of Femian deposite in the Tartan Field, Spl Publ Inst Asso Sediment. Vol. 5, pp. 323334, 1981.

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  • Sediment Composition of the Thakuran River Basin of the Sunderbans

Abstract Views: 491  |  PDF Views: 163

Authors

Gautam Kumar Das
Department of Chemical Engineering, Jadavpur University, Kolkata– 700 032, India

Abstract


Thakuran River sediments are typical estuarine. Lithogenic constituents are dominant with about 85-90% in bulk and biogenic components constitute the rest (10-15%). Quartz, feldspars, mica, lithic fragments and some heavy minerals are the main terrigenous constituents. Secondary overgrowth of quartz with multiple rims of inclusions suggests their derivation from sedimentary rocks of different cycles of sedimentation. The heavy mineral assemblage in the sediments lead to conclude that the sediments have been derived from the acid igneous rocks of the Himalayas in the north and the metamorphic rocks of the Precambrian shields of the west and north-west of Bengal Basin. Benthic foraminiferal assemblage indicates a shallow water, moderate to low salinity environment of deposition.

Keywords


Lithogenic Components, Biogenic Components, Heavy Minerals, Acid Igneous Minerals, Metamorphic Sources, Sedimentary Rocks, Thakuran River, Sunderbans.

References





DOI: https://doi.org/10.21843/reas%2F2016%2F17-21%2F158772