Les pseudotachylites en conditions granulitiques de la zone de cisaillement paléoprotérozoïque de Tikachitine, terrane d'In Ouzzal (Bouclier. - Iconography: Les orthogneiss calco-alcalins de Foumban-Bankim: témoins d une zone interne de marge active panafricaine en cisaillement. Archean and Paleoproterozoic fault history of the Big lake shear zone, Résumé: La zone de cisaillement de Big Lake dans la région des lacs MacQuoid et.


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Role of plagioclase and reaction softening in a metagranite shear zone at mid-crustal conditions Gotthard Massif, Swiss Central Alps.

Journal of Metamorphic Geology, 28 8 Strain localization processes in shear zones: Petrological, metamorphic and microstructural characterization of the Eita shear zone and Campo-Grosina units Austroalpine Nappes: Mid-crustal shear zone formation in granitic zone de cisaillement Strain localization in mid-crustal granitic rocks: Penrose Conference, Deformation Localization in Rocks: New Advances Oliot E.

Influence of deformation mechanisms and metamorphic reactions during strain localization in the continental crust under lower amphibolite facies conditions: Strain localization in a metagranite under amphibolite-facies conditions: Thesis Strain localization in the ductile continental crust: Interplays between deformation, metamorphism and chemical mass transfers - Structural geology stress and strain, fold, fractures and fluid flow - Microstructural and textural analyses of plastically deformed rocks.

Based on thermo-chronometric data, the proposed model can explain most of the ductile structures S1 postdating zone de cisaillement Silurian continental subduction, which is reflected by high-pressure relics Leyreloup et al.

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The extensional structuring of the Maures massif was accommodated by ductile to ductile-brittle top-to-the-NW shear zones, which separate successive northwestward-dipping units. The described model interprets all post-Sn deformation as increments of the late-orogenic extension during a period of retrograde metamorphism Morillon, ; Morillon et zone de cisaillement.

Nevertheless, parts of the post-D1 deformation are synchronous with the regional MT-MP metamorphism D2 —this indisputable prograde metamorphism, marked by a steeply westward dipping schistosity, is necessarily disconnected from zone de cisaillement late-orogenic extension D3 and inevitably associated with a strong horizontal shortening.


This paper exposes a new map, kinematic zone de cisaillement petrostructural data acquiered on a key area of the Maures massif, where the compressional structures have escaped the effects of late extension. It proposes different arguments in favour of polyphased processes that can explain the structuring of this part of zone de cisaillement Variscan belt.

Geological setting The Maures massif 60 km x 60 km is located in the southern part of the Variscan belt of western Europe.

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Zone de cisaillement is composed of two well-contrasted parts Fig. The series here shows evidence of a MT-MP metamorphism synchronous with the D2 deformation and prograding from west to east Buscail et al.

The D2 deformation is characterized by a reworking of the S axial-plane cleavage zone de cisaillement the isoclinal folds, by open asymmetrical similar A-folds Arthaud and Matte, ; Bronner et al.

A westward-dipping S2 strain-slip cleavage is axial-plane to these open folds.

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Structural analysis A new structural sketch map A major abnormal contact, marked by numerous zone de cisaillement sheets and a major thrust fault in the Gassin — La Croix Valmer area, separates two unconformable structural units Figs.

The former is characterized by a Zone de cisaillement low-angle schistosity S2, whereas the latter mainly exibits a NW-SE-trending steeply-dipping schistosity S2.

The thrusts are confirmed not only by a general obliquity between the thrust traces and isogrades, but also by an inverted zone de cisaillement zonation —the Tuiles Unit belongs to the sillimanite-muscovite or kyanite-biotite zone, whereas the Cavalaire Unit belongs to the staurolite-chlorite zone Buscail et al.

Low-angle faults are truncated by the late sinistral strike-slip Grimaud Fault Vauchez and Bufalo,

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