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The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines, Italy)

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Abstract

In the Alpine-Mediterranean region, the continental redbeds and shallow-marine siliciclastics related to the early depositional phases of the Late Permian-Mesozoic continental rifting are referred to as the most common representative of the “Verrucano tectofacies”. The Verrucano-type successions exposed in southern Tuscany are diachronous, spanning from Triassic to earliest Jurassic in age, and accumulated within the Tuscan domain, a paleogeographic region of continental crust that due to the opening of the Piedmont–Ligurian ocean formed part of the Adria passive-margin. They belong to the metamorphic Verrucano Group and the non-metamorphic Pseudoverrucano fm. Viewed overall, these Verrucano-type successions appear to manifest five episodes or pulses of an ongoing continental rifting. With the exception of the first episode that developed entirely within a terrestrial setting, each one is represented by basal Verrucano-type continental siliciclastics overlain by compositionally mixed marine deposits, which resulted from four diachronous, post-Middle Triassic transgressions. This suite of tectonic pulses produced the progressive westward widening (backstepping) of the Tuscan domain in the rifting south-Tuscany area.

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Acknowledgments

We are grateful to Giuseppe Cassinis and Gian Battista Vai for their critical comments and constructive criticism. An earlier version of the manuscript benefited from insightful comments by Patrick Conaghan. This work stems from the PhD thesis of one the authors (Mauro Aldinucci) and it was funded by University of Siena (PAR grants, A. Gandin and F. Sandrelli).

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Aldinucci, M., Gandin, A. & Sandrelli, F. The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines, Italy). Int J Earth Sci (Geol Rundsch) 97, 1247–1269 (2008). https://doi.org/10.1007/s00531-007-0208-9

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  • DOI: https://doi.org/10.1007/s00531-007-0208-9

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