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). DOI: 10.5901/ajis.2015.v4n2p95
Highlights
The Kruja Zone is located in the central part of Albania and represents a carbonate platform that extends toward south, in Greece with Gabrovo Zone (Papa, 1970; Peza, 1973, 1975, 1977, 1982; I.S.P.GJ. – I.GJ.N. 1983; Meço and Aliaj, 2000; Robertson and Shallo, 2000; Heba and Prichonnet, 2006, 2008)
The Borizana section is found in the Makareshi structure (Fig. 1a), where the Santonian, Campanian and Maastrichtian deposits are represented by limestones, dolomitic limestones and thick layered dolomites (Fig. 1b) containing debris of different organisms such as Rhapydionina liburnica, Accordiella conica, Hedbergella sp., Pithonella ovalis, Thaumatoporella parvovesiculifera, Aeolisaccus kotori, Lepidorbitoides sp, Orbitoides sp., etc
The Upper Cretaceous deposits, those belonging to Danian – Thanetian occur in bauxite pockets, The Eocene deposits consist of thin-bedded limestones which mainly contain a microfaunarepresented by Nummulites sp., Discocyclina sp, etc
Summary
The Kruja Zone is located in the central part of Albania and represents a carbonate platform that extends toward south, in Greece with Gabrovo Zone (Papa, 1970; Peza, 1973, 1975, 1977, 1982; I.S.P.GJ. – I.GJ.N. 1983; Meço and Aliaj, 2000; Robertson and Shallo, 2000; Heba and Prichonnet, 2006, 2008). The Borizana section is found in the Makareshi structure (Fig. 1a), where the Santonian, Campanian and Maastrichtian deposits are represented by limestones, dolomitic limestones and thick layered dolomites (Fig. 1b) containing debris of different organisms such as Rhapydionina liburnica, Accordiella conica, Hedbergella sp., Pithonella ovalis, Thaumatoporella parvovesiculifera, Aeolisaccus kotori, Lepidorbitoides sp, Orbitoides sp., etc. The Upper Cretaceous deposits, those belonging to Danian – Thanetian occur in bauxite pockets, The Eocene deposits consist of thin-bedded limestones which mainly contain a microfaunarepresented by Nummulites sp., Discocyclina sp, etc. The siliciclastic succession is represented by flysch deposits whichin the Makareshi structure are of Lower Oligocene age. Quaternary deposits mainly consisting of deposits of alluvial nature occur. Our study is focused only on the Upper Cretaceous carbonate succession. The aim of this paper is to present a detailed analysis of shallow water environments and their interpretation based on microfacies analysis and their diagenetic features
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