Characterization of Panandhro Lignite Deposits (Kachchh Basin), western India: Results from the Bulk Geochemical and Palynofloral Compositions
Authors
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
R. P. Mathews -
Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
B. D. Singh
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
Hukam Singh
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
V. P. Singh
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Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow – 226 007
Alpana Singh
DOI:
https://doi.org/10.1007/s12594-018-0851-8Abstract
Characterization of the Panandhro lignite deposits from western Indian state of Gujarat, based on the geochemical and palynological evidences, has been performed to assess the floral composition, maturity and hydrocarbon potential of the sequence. Elementally, the lignites consist of moderate carbon, low hydrogen and moderate sulfur contents. The samples are characterized by high TOC contents (lignite: av. 46.43 wt.%, resin: 62.47 wt.%). The average HI values for the lignite is 136 mg HC/g TOC, and that of the associated resin is 671 mg HC/g TOC. The highest Tmax is recoded in lignite (422°C) and lowest in the resin (39°C) samples. The FTIR spectrum of lignite is characterized by highly intense OH stretching peak ~3350 cm-1, aliphatic CHx stretching peaks between 3000-2800 cm-1, aromatic C=O stretching and an aromatic C=C stretching. The spectrum of resin shows strongest absorption due to aliphatic CHx stretching between 2940-2915 cm-1 and 2870-2850 cm-1, and deformation by the medium peak between 1450 and 1650 cm-1. The recovered palynofloral assemblage indicates the dominance of angiosperm pollen grains with maximum abundance of Arecaceae family, and subdominant pteridophytic spores. Marine influence is indicated by the presence of abundant dinoflagellate cysts. The occurrence of flora from a variety of ecological niches suggests a luxuriant diverse vegetation pattern existed in the vicinity of depositional site under humid tropical conditions. The overall characteristics of the lignite deposits point towards their ability to generate (upon maturation) hydrocarbons as they have types III-II admixed kerogen (organic matters).
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