The Mesozoic continental rifting in the Mediterranean area: insights from the Verrucano tectofacies of southern Tuscany (Northern Apennines,Italy) |
| |
Authors: | Mauro Aldinucci Anna Gandin Fabio Sandrelli |
| |
Institution: | (1) Department of Earth Sciences, University of Siena, Via Laterina, 8, Siena, 53100, Italy |
| |
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. |
| |
Keywords: | Mesozoic continental rifting Triassic redbeds Verrucano tectofacies Northern Apennines southern Tuscany |
本文献已被 SpringerLink 等数据库收录! |
|