Microfacies and diagenetic-fabric of the Samana Suk Formation at Harnoi Section,Abbottabad,Khyber Pakhtunkhwa,Pakistan

A detailed geological investigation of the samana suk formation at the harnoi section,district abbottabad,pakistan was carried out to elaborate its microfacies settings and diagenetic features. thirty one samples were studied from a 60m thick section and three microfacies with five sub microfacies identified. the microfacies includes; 1. grainstone microfacies (ooid grainstone,peloidal grainstone and intra-ooid grainstone as sub microfacies),2. mudstone microfacies (partially dolomitized mudstone and dolomicrite as sub microfacies) and 3. bioclastic wackstone microfacies. the depositional environment depicted is beach,bars and shoal for grainstone microfacies,restricted lagoon for mudstone microfacies and inner to mid ramp for bioclastic wackestone microfacies. a variety of cement morphologies from early to late diagenetic phases have been identified. micrite and spar have been developed in different diagenetic settings. diagenetic features like stylolites,calcite veins,fractures,deformation and ferroan-calcite formation have been observed. varying degree of dolomitization has been developed at various levels within the formation. the samana suk formation at the harnoi section represents inner to mid-ramp environment of deposition.