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Haris Azim Khan, M.
- Petrofacies and Diagenesis of Bayana Basin Conglomerates (Delhi Supergroup), Bharatpur District, Rajasthan
Authors
1 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, Uttar Pradesh, IN
2 Geology Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh-202 002, Uttar Pradesh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 3 (2005), Pagination: 335-345Abstract
The Bayana Sub-Basin comprises thick sequence of metavolcanics and metasedimentary rocks belonging to Delhi Supergroup. The deposition of sediments took place in response to vertical tectonism during Middle Proterozoic in fluvial and shallow marine environments. The rocks are mainly clastics and include conglomerate, sandstone and shale.The conglomerate lithofacies and petrofacies were studied with a view to understand the tectonic setting of the provenance and the basin. The conglomerate matrix consist of framework detrital grains such as several varieties of quartz followed by rock fragments, mica, feldspar, and heavy minerals. The Qt-F-L, Qm-F-Lt, Qp-Lv-Ls and Qm-P-K diagrams suggest continental block, recycled orogen provenance, rifted continental margin type of basin setting and overall maturity and stability of the continental block provenance. The cement phases in conglomerate matrix consist of iron oxide, silica, carbonate and barite. Dominance of floating, point and long contacts indicates that the sand grains did not suffer much pressure solution.
Keywords
Conglomerate, Petrofacies, Diagenesis, Bayana Sub-Basin, Delhi Supergroup, Bharatpur, Rajasthan.
- Petrofacies and Diagenetic Study of Rewa Sandstone, Baretha Area (Bayana), Bharatpur, Rajasthan
Authors
1 Department of Geology Aligarh Muslim University, Aligarh - 202 002, U P, IN
2 Geology Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh - 202 002, U P, IN
3 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, U P, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 6 (2004), Pagination: 731-738Abstract
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 provenanceThe 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.