Facies controlled diagenetic evolution of the Delhi Group Sandstones,Bayana Basin,Rajasthan |
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Authors: | C Saikia A H M Ahmad S M Wasim |
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Institution: | (1) Research Center for Dams & Water Resources, Mosul University, Mosul, Iraq |
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Abstract: | The Bayana Basin forms the eastern most limit of north Delhi fold belt covering parts of northeastern Rajasthan. The deposition
of sediments took place during middle Proterozoic in fluvial and shallow marine environments. The rocks are mainly clastics
and include conglomerate, sandstone and shale. During mechanical compaction rearrangement of grains took place and point and
long contacts were formed. The sandstones are cemented by iron oxide, silica, carbonate and barite. The porosity has developed
due to dissolution of iron, carbonate cement and feldspar grains. Dissolution of quartz along grain boundaries and silica
rich compaction pore water seems to be the main source of silica. These observations suggest progressive compaction which
initiated at the sediment water interface and continued till deep burial diagenesis in a rapidly subsiding basin. |
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