Details

Autor(en) / Beteiligte

• Saha, Debasree
• Chatterjee, Debashis
• Chakravarty, Sanchita
• Mazumder, Madhurina

Titel

Trace element geochemistry and mineralogy of coal from Samaleswari open cast coal block (S-OCB), Eastern India

Ist Teil von

• Physics and chemistry of the earth. Parts A/B/C, 2018-04, Vol.104, p.47-57

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Coal samples of Samaleswari open cast coal block (S-OCB) are high ash (Aad, mean value 35.43%) and low sulphur content (St, on dry basis, mean value 0.91% < 1%) in quality. The stratigraphic variation of volatile matter and fixed carbon (dry ash-free) reflect a progress of coal metamorphism with depth that accordance to the coal rank variation from lignite to high volatile bituminous in the studied borehole. The younger coal seams have greater detrital minerals (quartz, illite, rutile) influence whereas older coal seams have greater authigenic mineral (kaolinite, dolomite, siderite, apatite) contribution that are possibly due to subsidence and sediment transportation. In S-OCB coal trace elements affinities in-between mineral and organic fraction are identified with statistical hierarchical cluster analysis. The work is further supported by the use of chemical fractionation experiment that reveals the multi mode of occurrence of several environmentally concern and interested trace elements (Sb, As, Be, Cd, Cr, Co, Cu, Pb, Mn, Ni, Zn). Among the analysed trace elements Co, Mn and Zn have major silicate association along with significant carbonate/oxide/monosulfide association. Whereas As, Cd, Cu, Pb and Ni have dominant pyritic association with notable silicate and carbonate/oxide/monosulfide association. The rest three elements (Sb, Be, Cr) have principally organic association with minor silicate and carbonate/oxide/monosulfide association. The stratigraphic variation of organo-mineral matrix content and detrital-authigenic mineral ratio are primarily related to coal rank. Geochemical character of coal also reflects a light towards proper utilisation of S-OCB coal from technical and environmental view point. •Progress of coal metamorphism with depth in the seams of S-OCB.•Stratigraphic elemental and mineralogical compositional variation of coals in the borehole.•Multiple mode of occurrence of environmentally concern and interested trace elements.•Organo-mineral matrix content and detrital-authigenic mineral ratio are related with coal rank.•Geochemical character reflects a light towards proper utilisation of coal from technical and environmental view point.