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Debasish Shome ¹, Indrani Bhattacharyya ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Kolkata-700032, IN

Abstract

Criteria to idenify the variously affected zones of a coal seam intruded by igneous bodies of variable composition and configuration is a matter of investigation long since Changes in physical,chemical, optical and structural behavior of coal indicate an increase in rank toward the coal-intrusive contact. In present study a comparison of the above parameters reveals a distinct difference in the behavioral pattern with changing distances from the contact beyond which normal charactenstics of coal seam is retained. The identification of zones of variable rank with distance from coal-lntrusive contact may act as a guide during mining and proper utilization sector for coal.

Keywords

Coal Seam, Thermal Effect, Coal Characterisation, XRD, SEM.

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Partha Jit Roy ¹, Mrinal Kanti Roy ¹, Debasish Shome ², Md. Abdullah-Al-Mahbub ¹, Dhiman Kumar Roy ¹, Sudip Saha ¹

Affiliations
1 Department of Geology and Mining, University of Rajshahi, Rajshahi-6205, BD
2 Department of Geological Sciences, Jadavpur University, Kolkata, IN

Abstract

The rock sequences of the Sylhet Limestone Formation, Dauki River section, Gwainghat, Sylhet were studied to identify their various petrological units, non-clastic minerals and fossil content. Limestones are of two varieties crystalline in lower horizon and fossiliferous in upper horizon. The various petrological units identified in the non-clastic portion of the Sylhet Limestone Formation include micrites, dismicrites, intramicrites, pelrmicrites, spantes, intrasparites, pelsparites, and oosparites. Calcite, dolomite and fossils with minor amount of clay, mica, chert, quartz, zircon, tourmaline, rutile, and opaque minerals constitute the limestones. Fossiliferous limestone consists of smaller and larger foraminiferal genera, such as Nummulites, Discocyclina Alveolina, Operculina, Assilina etc. with some Bryozoans and Brachiopod shells. The various petrological units mght have deposited in shallow marine environment with nonreducing as well as reducing condition by tidal, winnowing and non-agitating currents. Algal growth aided the various units in formation.

Keywords

Sylhet Limestone Formation, Dauki River, Gwainghat,Northeastern Sylhet, Bangladesh.

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