Geochemical study of Bara Formation from boreholes SB-14-TC and ST-24-TC, Thar Coalfield, Sindh, Pakistan

A. A.A. DAAHAR HAKRO, Q. D. KHOKHAR, S. H. SOLANGI, I. SIDDIQUI, M. H. AGHEEM, A. H. BHUTTO

Abstract


The coal resources of Sindh are encased into two stratigraphic horizons; Bara Formation (Middle Paleocene) and Sonhari member of Laki Formation (Eocene). Being coal bearing Formation of Thar coalfield, the Bara Formation warrants a detailed geochemical study of its sediments for better understanding of depositional environment and sedimentary processes operational at the time of its deposition. Major elements of twenty samples of Bara Formation from two selected Boreholes SB-14-TC and ST-24-TC were analyzed through X-ray fluorescence. The investigation of major elements (Si, Ti, Al, Na, Ca, K, Mn, Mg, Fe+3, P & S ), major elemental ratios and their correlation coefficient (r2) show that the origin of its constituting silica content is detrital, which is further confirmed by difference in the source of silica and alumina. The studied sediments have potentially deposited along the fringe of basin of deposition in deltaic to near shore depositional environment. The deposition of sediments took place under humid climatic condition, with relatively fast rate of sedimentation, showing better conditions for the growth, accumulation and preservation of organic source material of its coal. The studied sediments are potentially derived from igneous and metamorphic source rocks.

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