Abstract

A sedimentologic-stratigraphic study at decimetre to metre scale was carried out on carbonate platform deposits, late Kimmeridgian-Tithonian (Late Jurassic) in age. The studied section, 350 m thick, crops out at Macchia Diavola, along the south-western side of Monte Monaco di Gioia (Matese mountains. Campania Apennines). Seven lithofacies, grouped in three main lithofacies associations, have been distinguished. Their vertical organization, together with related early diagenetic features, suggests environmental changes developed in an inner carbonate platform domain. At a scale of metres to tens of metres, a total of 11 relative sea level cycles have been recognised, frequently characterized by erosional boundaries which truncate lagoonal deposits, showing subaerial-exposure related traits (karstic cavities and/or pedogenetic features) in their uppermost part. While the thinner cycles document more restricted lithofacies associations, whose upward thinning stacking pattern indicates long-term Regressive Facies Trends, the thicker cycles, characterized by more open lithofacies associations, show a stacking pattern suggestive of a long-term Transgressive Facies Trend. This cyclic organization is well comparable with that of the Cretaceous carbonate platform successions previously studied in Central and Southern Italy. It is suggested here that the rhythmic Late Jurassic environmental changes, like those of the Cretaceous recorded in the Matese area, were prevailingly controlled by external mechanisms, even if minor auto-cyclic influences cannot be excluded.

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