Depositional environment and biofacies characterisation of the Triassic (Carnian to Rhaetian) carbonate succession of Punta Bassano (Marettimo Island,Sicily) |
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Authors: | Rossana Martini Simonetta Cirilli Céline Saurer Benedetto Abate Gaetano Ferruzza Giovanna Lo Cicero |
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Institution: | 1.Department of Geology and Palaeontology,University of Geneva,Geneva,Switzerland;2.Dipartimento di Scienze della Terra,University of Perugia,Perugia,Italy;3.Dipartimento di Geologia e Geodesia,University of Palermo,Palermo,Italy |
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Abstract: | The aims of this study are to reconstruct the geological setting of the Punta Bassano series (Marettimo Island, Egadi Archipelago,
western Sicily) and its palaeogeographic evolution. The reference section for the Upper Triassic of Marettimo shows an alternation
of marl and limestone beds together with brecciated levels. The limestones are both homogeneous mudstones with evaporite pseudomorphs
and laminated with fenestrae. Foraminiferal, palynomorph, and ostracod associations constrain the Punta Bassano sequence to
the Carnian-Rhaetian interval. The Punta Bassano succession represents a shallow inner ramp, ranging from open-marine environment
with good water circulation to lagoonal and peritidal protected environments. Freshwater input from rivers or groundwater
on the carbonate ramp is indicated by the ostracod microfauna. The comparison of facies and microfauna with those from other
sequences of the Mediterranean Upper Triassic (Pyrenees, Corsica, Sardinia, and Tunisia) allows us to confine the Punta Bassano
sedimentation to the northern margin of the Tethys, between the Corsican and the Pyrenean depositional setting. These new
results indicate that Marettimo Island, which is considered a single structural element being formed by four tectonic units,
is a piece of the southern margin of the European Plate, displaced over a longer distance to become part of the other Egadi
Islands, when the Corso-Sarde block made its rotation and successive collision with the North African Margin. |
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Keywords: | Upper Triassic Sedimentology Foraminifers Ostracods Palynomorphs Palaeogeography Sicily Marettimo Island |
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