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New stratigraphical data on the Middle-Late Jurassic biosiliceous sediments from the Sicanian basin, Western Sicily (Italy)

Abstract

The reported data present the stratigraphy of several sections across a Middle-Late Jurassic Radiolaritic Unit, well exposed in different thrust sheets pertaining to the Maghrebian chain of Southwestern Sicily. The aim was to define the chronostratigraphical distribution of the Jurassic biosiliceous sedimentation in the Sicanian palaeogeographical zone, a deep water basin belonging to the Southern Tethys continental margin.

The radiolarian biostratigraphy indicates that the switching from carbonate to siliceous sedimentation in the Sicanian Basin is referable to the Bajocian, as shown by the section of Campofiorito, near Corleone. The biostratigraphical dataset allows the correlation between the onset of biosiliceous sedimentation and the fall of biodiversity in the Sicanian basin with the carbonate productivity crisis, indicated by the highest eutrophication that affected Western Tethys during Middle Jurassic times.

Riassunto

Sono state studiate alcune sezioni dell’Unitá radiolaritica di etá Giurassico Medio-Superiore del Bacino Sicano, affioranti nel settore esterno della catena Appenninico-Maghrebide in Sicilia sud-occidentale. Lo scopo di questo lavoro è di definire la distribuzione cronostratigrafica dell’intervallo siliceo in questo settore paleogeografico della Tetide. In queste successioni la distribuzione di ben preservate associazioni a radiolari, consente di riferire la base delle radiolariti al Bajociano (sezione di Campofiorito). Questo dato rafforza l’ipotesi di una possibile crisi di produttività carbonatica, dovuta a eutrofizzazione, di estensione regionale nella Tetide occidentale durante il Giurassico Medio.

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Correspondence to Marco Chiari.

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Manuscript received June 25, 2007, Manuscript accepted May 16, 2008

Editorial handling: J.-P. Billon-Bruyat & M. Chiari (Guest)

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Chiari, M., Di Stefano, P. & Parisi, G. New stratigraphical data on the Middle-Late Jurassic biosiliceous sediments from the Sicanian basin, Western Sicily (Italy). Swiss J. Geosci. 101, 415–429 (2008). https://doi.org/10.1007/s00015-008-1276-y

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