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Petrofacies and Diagenetic Study of Rewa Sandstone, Baretha Area (Bayana), Bharatpur, Rajasthan
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The studied rocks form a part of Upper Rewa Sandstone, which overlies the Kaimur Sandstone in northwest part of the Vindhyan basin, exposed in various isolated ridges around Baretha area of Bayana, Bharatpur district of Rajasthan The sandstones are medium to fine grained and moderately well sorted to well sorted The sandstones consist of various types of quartz followed by feldspar, rock fragments, mica and heavy minerals The petrofacies in Qt-F-L, Qm-F-Lt, Qp-Lv-Ls and Qm-P-K ternary diagrams suggest mainly basement uplift source of craton intenor in rifted continental margin type basin setting with very low input from recycled orogen provenance
The sandstones are well compacted and dominated by interpenetrative contacts and are mainiy cemented by silica with very small amount of carbonate and Iron oxide Quartz overgrowths are well developed on monocrystalline quartz than polycrystalline ones Coarser fraction of detrital quartz grains have sequestered authigenic overgrowths covering more of its grain boundary and are thicker as compared to finer grains Dissolution of quartz along gram boundaries and silica rich compaction pore water seems to be the main source of silica.
Keywords
Sedimentary Petrology, Petrofacies, Diagenesis, Rewa Sandstone, Vindhyan Basin, Rajasthan.
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