Depositional environment and biofacies characterisation of the Triassic (Carnian to Rhaetian) carbonate succession of Punta Bassano (Marettimo Island, Sicily)

Benedetto Abate, Céline Saurer, Rossana Martini, Simonetta Cirilli, Gaetano Ferruzza, Giovanna Lo Cicero

Risultato della ricerca: Article

16 Citazioni (Scopus)

Abstract

AThe 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.palynomorph, and ostracod associations constrain the PuntaBassano sequence to the Carnian-Rhaetian interval. ThePunta Bassano succession represents a shallow inner ramp,ranging from open-marine environment with good watercirculation to lagoonal and peritidal protected environments.Freshwater input from rivers or groundwater on thecarbonate ramp is indicated by the ostracod microfauna.The comparison of facies and microfauna with those fromother sequences of the Mediterranean Upper Triassic (Pyrenees,Corsica, Sardinia, and Tunisia) allows us to conWnethe Punta Bassano sedimentation to the northern margin ofthe Tethys, between the Corsican and the Pyrenean depositionalsetting. These new results indicate that MarettimoIsland, which is considered a single structural elementbeing formed by four tectonic units, is a piece of the southernmargin of the European Plate, displaced over a longerdistance to become part of the other Egadi Islands, whenthe Corso-Sarde block made its rotation and successivecollision with the North African Margin.
Lingua originaleEnglish
pagine (da-a)389-400
Numero di pagine12
RivistaFacies
Volume53
Stato di pubblicazionePublished - 2007

All Science Journal Classification (ASJC) codes

  • Geology
  • Stratigraphy
  • Palaeontology

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