Abstract

The Lower-Middle (?) Miocene deposits stratigraphically overlying the Meso-Cenozoic carbonate substratum in the Monti della Maddalena ridge (Southern Apennines) represent a pre-orogenic sedimentary cycle deposited in a foreland area that occupied the former external margin of the Campano-Lucana Platform (CLP), before the tectonic emplacement of the Liguride accretionary wedge. A detailed stratigraphic and sedimentologic analysis has revealed that these deposits are characterized by strong vertical and lateral thickness and facies changes. These features are interpreted as the result of a complex basin geometry, consisting of asymmetric horst and graben structures bordered by steep fault planes. Thick calciclastic successions, made of breccia and turbidites, deposited in the down-thrown blocks, close to fault scarps, while the more distal areas are characterized by thinner and fine-grained successions. Condensed deposits are found on submerged structural highs. All the successions show an overall thinning and fining upward trend and an evolution from calciclastic to siliciclastic deposits. Facies and stratigraphy of the Lower-Middle (?) Miocene succession are best explained by a depositional setting strongly controlled by extensional tectonics related to flexural subsidence. The occurrence of lower Miocene deposits in neptunian dykes crosscutting the underlying carbonate succession strongly supports this hypothesis.

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