Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Principal Component Analysis of Lithologic Variables in Early Permian Barakar Coal-Measures, Western Singrauli Gondwana Sub-Basin of Central India


Affiliations
1 Directorate of Geology and Mining, Khanij Bhawan, Lucknow - 226 001, India
2 Department of Geology, Sri J.N.P.G. College, Lucknow - 226 001, India
     

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The quantitative relationships between lithological variables of Early Permian Barakar coal measures of western Singrauli Gondwana sub-basin are investigated using principal component analysis in an attempt to reveal simple relationships undetected by conventional quantitative methods. The results not only confirm and amplify those of the simple regression analysis described in Casshyap et.al. (1988), but are also interpreted in terms of evolution of coal swamps. If the total thickness of strata, total thickness of clastic sediments, total thickness of coal seams, number of sandstone beds, number of shale beds, number of coal seams and clastic ratio are considered, the first three components accounts for 80% of the total variance and the lithological variables generally fall into two groups. One group contains the first four variables, namely, total thickness of strata, total thickness of sandstone, total thickness of shale and total thickness of coal seams, all of which have basin-like regional patterns of sedimentation linked to net subsidence. The other group of variables, which are somewhat less closely related to net subsidence such as number of sandstone beds, number of shale beds and number of coal seam. The sand/shale ratio and clastic ratio are dependent on the other variables and seem to be unrelated to net subsidence. The principal component results, at best in geological term, may be explained by the to and fro lateral migration of a river channel across its flood plain coupled with a gradual isostatic adjustment of the basin floor in response to the weight of the sediments and differential subsidence through space and time.

Keywords

Principal Component Analysis, Barakar Coal Measures, Singrauli Sub-Basin, Gondwana.
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  • Principal Component Analysis of Lithologic Variables in Early Permian Barakar Coal-Measures, Western Singrauli Gondwana Sub-Basin of Central India

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Authors

Z. A. Khan
Directorate of Geology and Mining, Khanij Bhawan, Lucknow - 226 001, India
Ram Chandra Tewari
Department of Geology, Sri J.N.P.G. College, Lucknow - 226 001, India

Abstract


The quantitative relationships between lithological variables of Early Permian Barakar coal measures of western Singrauli Gondwana sub-basin are investigated using principal component analysis in an attempt to reveal simple relationships undetected by conventional quantitative methods. The results not only confirm and amplify those of the simple regression analysis described in Casshyap et.al. (1988), but are also interpreted in terms of evolution of coal swamps. If the total thickness of strata, total thickness of clastic sediments, total thickness of coal seams, number of sandstone beds, number of shale beds, number of coal seams and clastic ratio are considered, the first three components accounts for 80% of the total variance and the lithological variables generally fall into two groups. One group contains the first four variables, namely, total thickness of strata, total thickness of sandstone, total thickness of shale and total thickness of coal seams, all of which have basin-like regional patterns of sedimentation linked to net subsidence. The other group of variables, which are somewhat less closely related to net subsidence such as number of sandstone beds, number of shale beds and number of coal seam. The sand/shale ratio and clastic ratio are dependent on the other variables and seem to be unrelated to net subsidence. The principal component results, at best in geological term, may be explained by the to and fro lateral migration of a river channel across its flood plain coupled with a gradual isostatic adjustment of the basin floor in response to the weight of the sediments and differential subsidence through space and time.

Keywords


Principal Component Analysis, Barakar Coal Measures, Singrauli Sub-Basin, Gondwana.

References