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Sedimentary evolution of the Pennsylvanian–Permian Mulargia–Escalaplano molassic basin (Sardinia, Italy): the most complete record in the Southern Variscan Realm

Published online by Cambridge University Press:  15 June 2022

Luca Giacomo Costamagna Open the ORCID record for Luca Giacomo Costamagna [Opens in a new window]
Luca Giacomo Costamagna*
Affiliation:
Dipartimento di Scienze Chimiche e Geologiche, Cittadella Universitaria, Blocco A, 09042, Monserrato, CA, Italy
*
Author for correspondence: Luca G. Costamagna, Email: [email protected]
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Abstract

Field investigations into the sedimentary evolution of the Mulargia–Escalaplano late- to post-Variscan basin in Sardinia have been carried out. This basin is the only Variscan molassic basin in the Southern Variscan Realm where relationships between all the Late Pennsylvanian to Middle Triassic sedimentary cycles have been detailed for the first time. Here the interplay between tectonics and sedimentation can also be inferred. The investigations evidence that the sedimentary response recorded in the basin matches the progress and final collapse of the southern Variscan chain branch. The basin preserves continental deposits of decreasing energy organized in cycles, separated by weak unconformities related to abrupt volcano-tectonic climaxes and influenced by progressively drying climates. The sedimentary facies and stratigraphy suggest a progressive widening of the basin and decreasing depositional energy to the southeast as well as the migration of the basin depocentre in the same direction. Stratigraphic, environmental and evolutionary correlations between the presently separated NW and SE parts of the basin are reconstructed by considering the role of tectonics. As a result, a detailed lithostratigraphic framework for the Mulargia–Escalaplano basin is proposed. The findings in the sedimentary evolution match the evolution of similar coeval basins of France and Germany, following a pull-apart to extensional model. Based on comparisons with the other Sardinian and SW Europe coeval basins, relationships between ‘limnic’ and red bed successions in SW Europe during the collapse of the Variscan chain are discussed. The renaming of the European tectonomagmatic ‘Mid-Permian Episode’ to the ‘Lower Permian Episode’ is proposed.

Keywords

sedimentologycontinental environmentmolassic basinstectonics–sedimentation relationshipsLate Pennsylvanian–PermianSardinia
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 9 , September 2022 , pp. 1529 - 1568
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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