Microfacies Analysis and Diagenetic Settings of Upper Cretaceous Shallow Water Carbonates from the Borizana Section (Kruja Zone, Albania)

Abstract

This paper deals with the preliminary results of a detailed study based on the microfacies analysis and diagenetic settings of the Upper Cretaceous shallow water carbonate deposits from Borizana section, Kruja zone, Albania. In the Makareshi structure, the Upper Cretaceous deposits, in the mainly consists of limestones, dolomitic limestones and different levels of dolomite intercalations. The study was carried out after a systematic sampling of a total of 230 rock samples and then by studying selected thin sections from individual beds and from different parts of the same bed. 250 thin sections were studied from a 1000m thick section in order to analyse its sedimentology, microfacies assemblages and diagenetic featuress. Different types of microfacies mainly represented by laminated, peloidal and bioclastic grainstones along with presence of dolomitized microfacies at some levels were determined. Also different types of cement and diagenetic features such as compaction, dolomitization and neomorphism were also observed in Borizana section. All these microfacies associations and their diagenetic features indicate that this formation has been deposited in a restricted platform interior facies belt (FZ8, FZ9).