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    • Article
    Sélectionner

    Extensional neotectonics around the bend of the Western/Central Alps: an overview

    Sue, Christian
    Delacou, Bastien, Champagnac, Jean-Daniel, Allanic, Cécile, Tricart, Pierre, Burkhard, Martin
    International Journal of Earth Sciences. - 2007/96/6/1101-1129
    Disponible
    Plus…
    Titre: Extensional neotectonics around the bend of the Western/Central Alps: an overview
    Auteur: Sue, Christian
    Contributeur: Delacou, Bastien; Champagnac, Jean-Daniel; Allanic, Cécile; Tricart, Pierre; Burkhard, Martin
    Sujet: Alps - Faulting - Late orogenic extension - Strike-slip - Neotectonics - Seismotectonics - Geodynamics
    Description: The Western Alps' active tectonics is characterized by ongoing widespread extension in the highest parts of the belt and transpressive/compressive tectonics along its borders. We examine these contrasting tectonic regimes using a multidisciplinary approach including seismotectonics, numerical modeling, GPS, morphotectonics, fieldwork, and brittle deformation analysis. Extension appears to be the dominant process in the present-day tectonic activity in the Western Alps, affecting its internal areas all along the arc. Shortening, in contrast, is limited to small areas located along at the outer borders of the chain. Strike-slip is observed throughout the Alpine realm and in the foreland. The stress-orientation pattern is radial for σ3 in the inner, extensional zones, and for σ1 in the outer, transcurrent/tranpressional ones. Extensional areas can be correlated with the parts of the belt with the thickest crust. Quantification of seismic strain in tectonically homogeneous areas shows that only 10-20% of the geodesy-documented deformation can be explained by the Alpine seismicity. We propose that, Alpine active tectonics are ruled by isostasy/buoyancy forces rather than the ongoing shortening along the Alpine Europe/Adria collision zone. This interpretation is corroborated by numerical modeling. The Neogene extensional structures in the Alps formed under increasingly brittle conditions. A synthesis of paleostress tensors for the internal parts of the West-Alpine Arc documents major orogen-parallel extension with a continuous change in σ3 directions from ENE-WSW in the Simplon area, to N-S in the Vanoise area and to NNW-SSE in the Briançon area. Minor orogen-perpendicular extension increases from N to S. This second signal correlates with the present-day geodynamics as revealed by focal-plane mechanisms analysis. The orogen-parallel extension could be related to the opening of the Ligurian Sea during the Early-Middle Miocene and to compression/rotation of the Adriatic indenter inducing lateral extrusion
    Publication en relation: International Journal of Earth Sciences. - 2007/96/6/1101-1129
    Document hôte: International Journal of Earth Sciences
    Identifiant: 10.1007/s00531-007-0181-3 (DOI)

    • Plusieurs versions

    Orogen-parallel brittle extension as a major tectonic imprint in the Neogene evolution of the south-western Alpine arc

    Beucher, Romain, Sue, Christian, Tricart, Pierre
    International Journal of Earth Sciences, 2017, Vol.106(8), pp.2973-2990 [Revue évaluée par les pairs]

    • Plusieurs versions

    Dating the Tethyan Ocean in the Western Alps with radiolarite pebbles from synorogenic Oligocene molasse basins (southeast France)

    Cordey, Fabrice, Tricart, Pierre, Guillot, Stéphane, Schwartz, Stéphane
    Swiss Journal of Geosciences, 2012, Vol.105(1), pp.39-48 [Revue évaluée par les pairs]

    • Article
    Sélectionner

    Extensional neotectonics around the bend of the Western/Central Alps: an overview

    Sue, Christian
    Delacou, Bastien, Champagnac, Institut de Géologie, Université de Neuchâtel, Switzerland, Allanic Cecile, Tricart, Pierre, Burkhard, Martin
    International Journal of Earth Sciences. - 2007/96/6/1101-1129
    2007
    Disponible
    Plus…
    Titre: Extensional neotectonics around the bend of the Western/Central Alps: an overview
    Auteur: Sue, Christian
    Contributeur: Delacou, Bastien; Champagnac, Institut de Géologie, Université de Neuchâtel, Switzerland; Allanic Cecile; Tricart, Pierre; Burkhard, Martin
    Date: 2007
    Sujet: Alps - Faulting - Late orogenic extension - Strike-slip - Neotectonics - Seismotectonics - Geodynamics
    Description: The Western Alps’ active tectonics is characterized by ongoing widespread extension in the highest parts of the belt and transpressive/compressive tectonics along its borders. We examine these contrasting tectonic regimes using a multidisciplinary approach including seismotectonics, numerical modeling, GPS, morphotectonics, fieldwork, and brittle deformation analysis. Extension appears to be the dominant process in the present-day tectonic activity in the Western Alps, affecting its internal areas all along the arc. Shortening, in contrast, is limited to small areas located along at the outer borders of the chain. Strike-slip is observed throughout the Alpine realm and in the foreland. The stress-orientation pattern is radial for σ3 in the inner, extensional zones, and for σ1 in the outer, transcurrent/tranpressional ones. Extensional areas can be correlated with the parts of the belt with the thickest crust. Quantification of seismic strain in tectonically homogeneous areas shows that only 10–20% of the geodesy-documented deformation can be explained by the Alpine seismicity. We propose that, Alpine active tectonics are ruled by isostasy/buoyancy forces rather than the ongoing shortening along the Alpine Europe/Adria collision zone. This interpretation is corroborated by numerical modeling. The Neogene extensional structures in the Alps formed under increasingly brittle conditions. A synthesis of paleostress tensors for the internal parts of the West-Alpine Arc documents major orogen-parallel extension with a continuous change in σ3 directions from ENE–WSW in the Simplon area, to N–S in the Vanoise area and to NNW–SSE in the Briançon area. Minor orogen-perpendicular extension increases from N to S. This second signal correlates with the present-day geodynamics as revealed by focal-plane mechanisms analysis. The orogen-parallel extension could be related to the opening of the Ligurian Sea during the Early-Middle Miocene and to compression/rotation of the Adriatic indenter inducing lateral extrusion.
    Publication en relation: International Journal of Earth Sciences. - 2007/96/6/1101-1129
    Document hôte: International Journal of Earth Sciences
    Identifiant: 10.1007/s00531-007-0181-3 (DOI)

    • Livre
    Sélectionner

    De l'océan à la chaîne de montagnes : tectonique des plaques dans les Alpes

    Lemoine, Marcel
    Graciansky, Pierre Charles de, 1935-, Tricart, Pierre, Société géologique de France
    Paris : Gordon and Breach Science Publishers
    2000
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    Titre: De l'océan à la chaîne de montagnes : tectonique des plaques dans les Alpes / Marcel Lemoine, Pierre-Charles de Graciansky, Pierre Tricart ; en collab. avec la Société géologique de France
    Auteur: Lemoine, Marcel
    Contributeur: Graciansky, Pierre Charles de, 1935-; Tricart, Pierre; Société géologique de France
    Editeur: Paris : Gordon and Breach Science Publishers
    Date: 2000
    Collation: 206 p. : ill. ; 25 cm
    Collection: Collection Géosciences
    Documents dans cette collection: Géosciences. Gordon and Breach Science
    Sujet RERO: Tectonique des plaques - Alpes (chaîne)
    Classification: LC QE511.4
    Identifiant: 9056992945 (ISBN); http://catalogue.bnf.fr/ark:/12148/cb371122373 (URN)
    No RERO: R270475860
    Permalien:
    http://data.rero.ch/01-R270475860/html?view=FR_V1

    • Plusieurs versions

    Diachronous evolution of the alpine continental subduction wedge: Evidence from P–T estimates in the Briançonnais Zone houillère (France – Western Alps)

    Lanari, Pierre, Guillot, Stéphane, Schwartz, Stéphane, Vidal, Olivier, Tricart, Pierre, Riel, Nicolas, Beyssac, Olivier
    Journal of Geodynamics, May 2012, Vol.56-57, pp.39-54 [Revue évaluée par les pairs]

    • Plusieurs versions

    Structural and Sedimentary records of the Oligocene revolution in the Western Alpine arc

    Dumont, Thierry, Schwartz, S, Guillot, Stephane, Simon-Labric, Thibaud, Tricart, Pierre, Jourdan, Sebastien
    Journal of geodynamics, 05 May 2012, Vol.56-57, pp.18-38 - GEOD-1101 [Revue évaluée par les pairs]

    • Plusieurs versions

    P–T–t estimation of deformation in low‐grade quartz‐feldspar‐bearing rocks using thermodynamic modelling and 40 Ar/ 39 Ar dating techniques: example of the Plan‐de‐Phasy shear zone unit (Briançonnais Zone, Western Alps

    Lanari, Pierre, Rolland, Yann, Schwartz, Stéphane, Vidal, Olivier, Guillot, Stéphane, Tricart, Pierre, Dumont, Thierry
    Terra Nova, April 2014, Vol.26(2), pp.130-138 [Revue évaluée par les pairs]

    • Plusieurs versions

    Geo-thermochronology of the Saint Antonin basin, south-eastern France

    Jourdan Sébastien, Bernet Matthias, Hardwick Elizabeth, Paquette Jean-Louis, Tricart Pierre, Senebier François, Coeur Francis
    Bulletin de la Société géologique de France, 01 January 2018, Vol.189(3), p.12 [Revue évaluée par les pairs]

    • Plusieurs versions

    Interaction between tectonic and erosion processes on the morphogenesis of an Alpine valley: geological and geophysical investigations in the lower Romanche valley (Belledonne massif, western Alps)

    Le Roux, Olivier, Schwartz, Stéphane, Gamond, Jean, Jongmans, Denis, Tricart, Pierre, Sebrier, Michel
    International Journal of Earth Sciences, 2010, Vol.99(2), pp.427-441 [Revue évaluée par les pairs]