New stratigraphical data on the Middle-Late Jurassic biosiliceous sediments from the Sicanian basin, Western Sicily (Italy) |
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| Authors: | Marco Chiari Pietro Di Stefano Guido Parisi |
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| Institution: | (1) C.N.R. Istituto di Geoscienze e Georisorse, Unità di Firenze, Via G. La Pira 4, 50121 Firenze, Italy;(2) Dipartimento di Geologia e Geodesia, Università di Palermo, Via Archirafi 22, 90123 Palermo, Italy;(3) Dipartimento di Scienze della Terra, Università degli Studi di Perugia, Piazza Università, 06100 Perugia, Italy |
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| 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.
Editorial handling: J.-P. Billon-Bruyat & M. Chiari (Guest) |
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| Keywords: | :" target="_blank">: radiolarians biostratigraphy cherts basalts Middle-Late Jurassic Sicily |
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