engleski

Alveolinids, Link Between the Neotethys Provinces During the Paleogene, as a Case - Pg Adriatic Carbonate Platform

Sediments deposited on the Paleogene Adriatic carbonate platform (PgAdCP), unique and distinguished paleogeographic unit, are today exposed along the eastern Adriatic coast in length of 600km and in width of 100-130 km. 90 identified alveolinid species ranging in age from the Ilerdian to the middle Lutetian, depict dynamic of their evolution with emphasis on the following: 1) great species diversity and great abundance in the middle Ilerdian (SBZ 8) followed by sharp declination in occurrences at the Ilerdian/Cuisian transition ; 2) diversity boom in the late Cuisian (SBZ 11, SBZ 12) and an abrupt decrease in species numbers after the early Lutetian. This pattern shows relationship between abundance/ diversity and global sea-level changes in TA events. The &raquo ; two peaks&laquo ; model in alveolinid occurrence is present, also, in &raquo ; Mediterranean assemblage&laquo ; in Pyrenean and within the middle Cuisian association at different Mediterranean areas. Based on studies of numerous section on the PgAdCP, biosedimentary zones (BioZ 2, 3, 4) were determined, each zone characterized by its specific alveolinid associations. These zones distributed as belts, are stretching from the N Italy (Friuli) to the southeast to Montenegro. Alveolinid association served as base for paleogeographic maps of the PgAdCP from the Cretaceous/Paleogene boundary to Priabonian.

Paleogene; Alveolinids; Neotethys; PgAdCP

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