Abstract:
Present study reveals excellent outcrop of carbonate succession of Jurassic Samana Suk Formation exposed in Nizampur basin located at the southern margin of the Attock-Cherat Ranges in Kahi Section. The study area is tectonically active which is bounded towards north and south by Peshawar basin and MBT respectively. In study area, Formation was sampled for the microfacies analysis. Detailed petrographic analysis concluded that Samana Suk Formation consists of four major fancies and eleven (S1-S11) microfacies that are associated with lagoon to mid ramp settings. Ooidal grainstone (S1) is the most dominant microfacies present in the respective Formation. On the basis of fancies analysis depositional model was constructed which indicated that these microfacies were deposited from lagoonal to middle ramp settings. Diagenetic study reveals that Samana Suk Formation experienced various stages of digenesis which includes micritization, neomorphism, cementation, dissolution and compaction, based on these diagenetic events a detailed paragenetic sequence was established. XRD results concluded the overall composition of Samana Suk Formation is dominated by calcite mineral and few minor minerals including dolomite, silica, alumina, bornite and pyrite.
