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Pre-Orogenic Tectonostratigraphic Evolution of the European Distal Margin-Alpine Tethys Transition Zone in High-Pressure Units of the Southwestern Alps

Balestro, Gianni ; Festa, Andrea ; Cadoppi, Paola ; Groppo, Chiara ; Roà, Matthieu

Geosciences (Basel), 2022-09, Vol.12 (10), p.358 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
Pre-Orogenic Tectonostratigraphic Evolution of the European Distal Margin-Alpine Tethys Transition Zone in High-Pressure Units of the Southwestern Alps
Autor: Balestro, Gianni ; Festa, Andrea ; Cadoppi, Paola ; Groppo, Chiara ; Roà, Matthieu
Assuntos: Ablation ; Analysis ; Cambrian ; Continental margins ; Cretaceous ; Dora Maira massif ; Earth science ; Environmental aspects ; Geologic mapping ; Geological mapping ; Geology ; Geology, Stratigraphic ; Isotopes ; Jurassic ; Massifs ; Natural history ; Ocean basins ; ocean-continent transition zone ; Orogeny ; Paleoceanography ; Passive margins ; Permian ; Plate tectonics ; Radiometric dating ; Sedimentary facies ; Shear zone ; Shear zones ; Stratigraphy ; structural inheritance ; Tectonics ; Tectonics (Geology) ; tectonostratigraphy ; Transition zone ; Triassic ; Western Alps
É parte de: Geosciences (Basel), 2022-09, Vol.12 (10), p.358
Descrição: Geological mapping, stratigraphic observations, and U/Pb dating allow reconstructing the pre-orogenic setting of the transition zone between the distal European passive margin and the Alpine Tethys in the southwestern Alps. Although convergent tectonics overprinted the syn-rift Jurassic tectonic features, our data document an articulated Jurassic physiography. From the distal European passive margin oceanward, we distinguished: the Dronero Unit (the southernmost Dora Maira massif), represents a continental margin composite basement wherein monometamorphic metasediments are interlayered with Late Permian (253.8 ± 2.7 Ma) metavolcanic rocks; the Sampeyre Unit, represents a structural high consisting of Lower Triassic Verrucano-facies siliciclastic metasediments unconformably sealed by Cretaceous calcschist bearing Globotruncana sp.; the Maira Unit, corresponds to a Middle Triassic platform succession detached from the Sampeyre Unit; the Grana Unit, corresponds to a Late Triassic–Late Jurassic platform to basin succession; the Queyras Schistes Lustrès Complex, represents the ocean basin succession. Tectonic slices of Cambrian (513.9 ± 2.7 Ma) metadiorite hosted in the Valmala Shear Zone, separating the Dronero Unit from the underlying (U)HP units of the Dora Maira massif, suggests a potential pre-Alpine activation of the shear zone.
Editor: Basel: MDPI AG
Idioma: Inglês

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Pre-Orogenic Tectonostratigraphic Evolution of the European Distal Margin-Alpine Tethys Transition Zone in High-Pressure Units of the Southwestern Alps

Balestro, Gianni ; Festa, Andrea ; Cadoppi, Paola ; Groppo, Chiara ; Roà, Matthieu

Basel: MDPI AG

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