Mesozoic and Paleogene megabreccias in Southern Sicily: New data on the Triassic Paleomargin of the Siculo-Tunisian platform |
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Authors: | Dr Pietro Di Stefano Dr Aldo Alessi Dr Maria Gullo |
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Institution: | (1) Dipartimento di Geologia e Geodesia dell’Università di Palermo, Corso Tukory 131, I-90134 Palermo |
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Abstract: | Summary Mesozoic and Paleogene clastic carbonates in deep-water successions outcropping in the Sicani mountains (central southern
Sicily) represent debris-flow and turbidite deposits accumulated in slope/base-of-slope sectors of the Sicanian Basin, a Permian
to Miocene deep-water sedimentary domain of Sicily. Reef-derived carbonates of late Triassic age are frequently found among
the clastic elements of these deposits, in association with other shallow and deep-water Mesozoic carbonates. The provide
us with new data on the stratigraphic setting of a platform paleomargin now buried beneath the Sicilian thrust and fold belt.
This paleomargin bounded the wide middle and upper Triassic carbonate platform which is now known in the subsurface of the
Southern Sicilian thrust and fold belt. This paleomargin bounded the wide middle and upper Triassic carbonate platform which
is now known in the subsurface of the Southern Sicilian mainland and offshore in the Pelagian Platform, from the Malta escarpment
to the Sciacca and Trapani areas through the Hyblean Plateau. The hinge zones between this platform domain and the Sicanian
basin were particularly affected by the paleostresses related to the Mesozoic and Paleogene evolution of the Southwestern
Tethys. The sedimentary successions of these areas recorded repeated episodes of progradation, aggradation, backstepping,
uplift and erosion of the platform-basin system, under eustatic and tectonic forcing. |
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Keywords: | Sedimentology Allochthonous Carbonates Base of Slope Deposits Calcareous Breccias Reef Limestones Paleogeography Sicily Triassic |
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