MICROFACIES ANALYSIS OF GHAR FORMATION (WESTERN DESERT OF IRAQ)

Abstract

ABSTRACT Ghar Formation outcrop at the Iraqi western desert was studied by microfacies analysis of (13) thin sections collected from wadi Al-Ratgha ( west of Qaim ) . According to petrographic com position and organisms content ,rocks were subdivided into (4) microfacies units :bioclastic wackestone , mudstone , miliolids wackestone , and grainstone with aggregate grains microfacies .Microfacies units reflect shallow marine environment of low circulation of very warm water at the middle part . The lower and middle part interbedded with quite open marine environment below the wave base . The upper part was deposited at shallow marine environment of low circulation . The main diagenetic processes were the transformation ( type of neomorphism) and precipitation of calcite in the fractures and fossil chambers .