Naslov
Organic Petrology and Geochemistry of the Cretaceous Carbonates of the Karst Dinarides (Croatia)

Autori
Španić, Darko ; Troskot-Čorbić, Tamara ; Čuljak, Veronika ; Maričić, Marija ; Rumenjak, LJubica ; Stanković, Irenka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
57th Annual Meeting of the International Committee for Coal and Organic Petrology, Abstracts Book / - Patras : University of Patras, 2005, 49-49

Skup
57th Annual Meeting of the International Committee for Coal and Organic Petrology

Mjesto i datum
Patras, Grčka, 18.09.2005. - 23.09.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Dinarides, organic petrology, Cretaceous

Sažetak
Adriatic Carbonate Platform, now forming Karst Dinarides, which exists from Middle Triassic to Eocene, reached its mature phase over periods of Jurassic and Cretaceous. At that time, typical shallow carbonate platform of Bahama-type was surrounded by the deep sea Tethys. During the Cretaceous, restricted lagoons and shallow, intraplatform lakes were favourable for formation of the fine-grained, laminated, organic rich carbonates (limestones and dolomitized limestones). This type of facies is most abundant during Albian-Cenomanian, Upper Santonian-Lower Campanian and Maastrichtian. Source material for organic matter is of microbial and algal origin, which forms lamalginite and bituminite. In the deeper parts of intraplatform depressions and in slope deposits (especially during Upper Santonian and Lower Campanian transgression) some strong fluorescing telalginite (mostly cysts of dinoflagelattes) is incorporated in bituminite (or “organic-mineral groundmass”). Total organic carbon of these rocks is 2 to 20 %, and kerogen is type I-II (HI=400-850), which results in a good to extremely high petroleum generative potential. Kerogen is very rich in organic bonded sulfur (5-11 %), due to the depletion in heavy ions. Another interesting characteristic is enrichment in heavy stable carbon isotope (δ13CPDB=18-24 ‰). Dominance of phytane over pristane in alkane fraction of the rock extracts reveals anoxic condition of sedimentation.

Izvorni jezik
Engleski

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