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Tectonique océanique et tectonique alpine dans les schistes lustrés de Haute Ubaye ( zone piémontaise des Alpes occidentales)

Abstract : Oceanic tectonic and alpine tectonic in the « Schistes lustrés » from Haute Ubaye (Piemont zone, occidental Alps). Cartographic, lithostratigraphic and structural analysis of the "SChistes lustrés" from Haute Ubaye allow to distinguish two sets of tectonic events. Mesosoic oceanic tectonic The description and interpretation of 15 or so sections in the Ligure units allow to display: a) the formation and structuration of the oceanic lithosphere of the ligurian Tethys. The oceanic basement was cutting in a blocks mosaic by some serpentinite-injected faults. b) the sedimentation in the Ligurian domain during the Jurassic and the Cretace times. Polygenie breccias are intercaled in the ophiolites. After the Oxfordian-Kimmerigian radiolarian sedimentation and the limestone deposit during the Malm time, the cretaceous pelagie alternate deposits are often reworked and intercalated with detrital levels. Now, the "indeteninated" calcschists are assign ta the Ligurian serie. We suggest a chronology for the tectonic and sedimentary Ligurian events. The lithostratigraphic analysis of the Cula unit assign to the "Ecailles intermediaires", shows that the "Formation brechique du Longet" displays a composite (oceanic and continental) detritism. We presume that the Cula serie was deposited on an ultramafic crust, appeared during the middle-upper Jurassic time, between the Briançonnais domain and the Piemontais domain. Cenozoic Alpine tectonic The structural anlysis shows four stages of cleavage-producting deformation. Three surimposed major fold generation are recognized on aIl scales. A structural map and a tectogenetic reconstruction are presented. The results are replaced in the classical Tethyan geodynamic reconstruction, during the Alpine Cycle. We show some interferences between oceanic paleostructures and alpine structures.
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https://tel.archives-ouvertes.fr/tel-00505260
Contributor : Pascale Talour <>
Submitted on : Friday, July 23, 2010 - 10:23:53 AM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
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  • HAL Id : tel-00505260, version 1

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Claude Gout. Tectonique océanique et tectonique alpine dans les schistes lustrés de Haute Ubaye ( zone piémontaise des Alpes occidentales). Tectonique. Université Joseph-Fourier - Grenoble I, 1987. Français. ⟨tel-00505260⟩

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