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Journal of the Geological Society; 2001; v. 158; issue.2; p. 353-366
© 2001 Geological Society of London

Regular Article

Stacking pattern of cyclic carbonate platform strata: Lower Cretaceous of southern Apennines, Italy

ARTURO RASPINI

1 Geomare Sud, Istituto di Ricerca del CNR, via Amerigo Vespucci, 9 80142, Napoli, Italy (e-mail: urouro{at}gms01.geomare.na.cnr.it)

Scientific editing by Duncan Pirrie.

Detailed sedimentological analysis of Aptian/Albian shallow-water carbonate platform strata from Monte Faito, southern Italy, reveal composite sea-level change. The organization of the lithofacies and their related diagenetic overprint have allowed the identification of 50 elementary cycles. They often show exposure-related diagenetic features superimposed on subtidal deposits, suggesting drops of relative sea level.

Elementary cycles are grouped into 16 bundles forming six superbundles. The hierarchical organization of the cycles are interpreted to be related to composite eustatic sea-level fluctuations driven by the Earth’s orbital perturbation in the Milankovitch frequency band. Moreover, the systematic variation of superbundle thickness and the general evolution of the lithofacies reflects variations of accommodation potential defining longer-term environmental changes.

Different lithofacies forming elementary cycles are frequently separated by bedding planes that, when viewed in a sequence stratigraphic context, are interpreted as transgressive surfaces, maximum flooding surfaces or sequence boundaries. This allows the recognition of lowstand, transgressive and highstand deposits in the cyclic units.

Considering both the bundle/superbundle ratio and the sequence stratigraphic interpretation of the superbundles, a chronostratigraphic diagram illustrating both gaps at bundle level and their expected location along the section was created. It establishes that the section developed over about 2.4 Ma.


Keywords: Lower Cretaceous, Southern Italy, carbonate platforms, shallow water environments, cyclic processes.




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