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AAPG Bulletin

Abstract

AAPG Bulletin, V. 96, No. 11 (November 2012), P. 20652089.

Copyright copy2012. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/03091211087

Tectonostratigraphic evolution of the Jurassic extensional basins of the eastern southern Alps and Adriatic foreland based on an integrated study of surface and subsurface data

Daniele Masetti,1 Roberto Fantoni,2 Roberta Romano,3 Dario Sartorio,4 Enrico Trevisani5

1Dipartimento di Scienze della Terra dell'Universita Studi di Ferrara, Polo Scientifico e Tecnologico, Via Giuseppe Saragat 1, I-44100 Ferrara, Italy; [email protected]
2Eni Exploration amp Production Division, Via Emilia 1, I-20097 San Donato Milanese, Italy; [email protected]
3Dipartimento di Scienze della Terra dell'Universita Studi di Ferrara, Polo Scientifico e Tecnologico, Via Giuseppe Saragat 1, I-44100 Ferrara, Italy; [email protected]
4Eni Exploration amp Production Division, Via Emilia 1, I-20097 San Donato Milanese, Italy; [email protected]
5Museo di Storia Naturale di Ferrara, Via De Pisis 24, I-44121 Ferrara, Italy; [email protected]

ABSTRACT

Successions that characterize the eastern southern Alps have been compared with coeval units drilled in the Alpine foreland (Po and Veneto plains, northern Adriatic Sea). The eastern southern Alps are composed of a carbonate platform-plateau, drowned in the Early Jurassic (Trento platform and plateau); a basin formed in the Early Jurassic (Belluno Basin) and a carbonate platform that lasted from the Jurassic to the Cretaceous (Friuli platform). Integration of stratigraphic and geophysical data illustrates the extensional architecture of the Alpine foreland subsurface. At the beginning of the Jurassic, peritidal successions were widespread everywhere except for the Belluno Basin. A reorganization of the Early Jurassic paleogeography affected the southern Alps around the Sinemurian–Pliensbachian boundary: the Pliensbachian successions were deposited in the central-western areas of the Trento platform whereas, elsewhere in the same platform and in the northern Friuli platform, Pliensbachian units are missing, replaced by an unconformity surface covered by crinoidal sands that have also been found in the subsurface. The Belluno Basin is recognizable in seismic profiles under the Veneto Plain. Southward (northern Adriatic Sea and Po plain), the basin between the Trento and the Friuli platforms, here called the “northern Adriatic Basin,” possesses a stratigraphy different from that of the Belluno Basin. The northern Adriatic Basin drowned later, and seismic profiles indicate that it was wider and bounded by groups of small synsedimentary faults instead of the major faults displacing the Belluno Basin. The northern Adriatic Basin can be interpreted as the northeastern extension of the Umbro-Marchean Basin of central Italy.

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