In recent decades, renewed focus has been directed towards the well-known "Permo-triassic" continental and volcanic deposits along the northwestern Sardinian coast north of Alghero. A detailed geological mapping, incorporating stratigraphic, sedimentological and structural analysis, along with the drone-based aerial photogrammetry, has allowed to unravel the complex tectono-stratigraphic history of the Cala Viola-Cala del Vino area. It has also been possible to demonstrate how the Porticciolo conglomerate and the Cala Viola sandstones can be subdivided into distinct and mappable lithofacies. Despite the absence of geochronological constraints for the identified structures, such as radiometric dating, the analysis of topology and cross cutting relationship of fault networks has allowed this study to attribute the deformative structures to at least eigth different tectonic events. Each event resulted in the formation of discrete shear zones associated with folds, or in the reactivation of pre-existing tectonic discontinuities. The same events were compared with those known at the regional scale. These new data make possible to reconstruct and disentangle the complex and long tectonic history affecting NW Sardinia since the deposition of the middle Permian deposits to the Holocene. In the future, quantitative analyses of the faults age/timing will provide time constraints, contributing to a more precise reconstruction of the tectonic history of the area and deeper understanding of the plate tectonics/geodynamic of NW-Sardinia.
In recent decades, renewed focus has been directed towards the well-known "Permo-triassic" continental and volcanic deposits along the northwestern Sardinian coast north of Alghero. A detailed geological mapping, incorporating stratigraphic, sedimentological and structural analysis, along with the drone-based aerial photogrammetry, has allowed to unravel the complex tectono-stratigraphic history of the Cala Viola-Cala del Vino area. It has also been possible to demonstrate how the Porticciolo conglomerate and the Cala Viola sandstones can be subdivided into distinct and mappable lithofacies. Despite the absence of geochronological constraints for the identified structures, such as radiometric dating, the analysis of topology and cross cutting relationship of fault networks has allowed this study to attribute the deformative structures to at least eigth different tectonic events. Each event resulted in the formation of discrete shear zones associated with folds, or in the reactivation of pre-existing tectonic discontinuities. The same events were compared with those known at the regional scale. These new data make possible to reconstruct and disentangle the complex and long tectonic history affecting NW Sardinia since the deposition of the middle Permian deposits to the Holocene. In the future, quantitative analyses of the faults age/timing will provide time constraints, contributing to a more precise reconstruction of the tectonic history of the area and deeper understanding of the plate tectonics/geodynamic of NW-Sardinia.
L'area costiera di Cala Viola-Torre del Porticciolo: un sito tettono-stratigrafico unico per svelare la tettonica polifasica nella Sardegna nord-occidentale
SCARANI, RUDY
2022/2023
Abstract
In recent decades, renewed focus has been directed towards the well-known "Permo-triassic" continental and volcanic deposits along the northwestern Sardinian coast north of Alghero. A detailed geological mapping, incorporating stratigraphic, sedimentological and structural analysis, along with the drone-based aerial photogrammetry, has allowed to unravel the complex tectono-stratigraphic history of the Cala Viola-Cala del Vino area. It has also been possible to demonstrate how the Porticciolo conglomerate and the Cala Viola sandstones can be subdivided into distinct and mappable lithofacies. Despite the absence of geochronological constraints for the identified structures, such as radiometric dating, the analysis of topology and cross cutting relationship of fault networks has allowed this study to attribute the deformative structures to at least eigth different tectonic events. Each event resulted in the formation of discrete shear zones associated with folds, or in the reactivation of pre-existing tectonic discontinuities. The same events were compared with those known at the regional scale. These new data make possible to reconstruct and disentangle the complex and long tectonic history affecting NW Sardinia since the deposition of the middle Permian deposits to the Holocene. In the future, quantitative analyses of the faults age/timing will provide time constraints, contributing to a more precise reconstruction of the tectonic history of the area and deeper understanding of the plate tectonics/geodynamic of NW-Sardinia.È consentito all'utente scaricare e condividere i documenti disponibili a testo pieno in UNITESI UNIPV nel rispetto della licenza Creative Commons del tipo CC BY NC ND.
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https://hdl.handle.net/20.500.14239/16764