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1996•Comptes Rendus de l Académie des Sciences - Series IIA - Earth and Planetary ScienceRequires access

Plissement hercynien synschisteux post-nappe et étirement subhorizontal dans le versant sud de la Montagne Noire (Sud du Massif Central, France)

Maurice Mattauer, Ph. Laurent, Ph. Matte

Open publisher page 15 citations

Abstract

South of the gneissic Zone Axiale (Axial Zone), the Palaeozoic Hercynian nappe pile of Montagne Noire shows a trend of E-NE folds, with axial planar cleavage and horizontal stretching lineation deforming the earlier nappe structures and particularly the basal thrusts of each nappe unit. These folds are the result of a general post-nappe Hercynian N-S shortening which resulted as well in the antiformal doming of the gneissic Axial Zone. A structural study focusing on shear criteria shows that the E-W to ENE trending stretching lineation contemporaneous with the F2 folding is the result of a bulk coaxial deformation during a N-S shortening and cannot be related to a large ductile dextral or sinistral strike-slip fault.

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What this paper is about

South of the gneissic Zone Axiale (Axial Zone), the Palaeozoic Hercynian nappe pile of Montagne Noire shows a trend of E-NE folds, with axial planar cleavage and horizontal stretching lineation deforming the earlier nappe structures and particularly the basal thrusts of each nappe unit. These folds are the result of a general post-nappe Hercynian N-S shortening which resulted as well in the antiformal doming of the gneissic Axial Zone. A structural study focusing on shear criteria shows that the E-W to ENE trending stretching lineation contemporaneous with the F2 folding is the result of a bulk coaxial deformation during a N-S shortening and cannot be related to a large ductile dextral or sinistral strike-slip fault.

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Available abstract

South of the gneissic Zone Axiale (Axial Zone), the Palaeozoic Hercynian nappe pile of Montagne Noire shows a trend of E-NE folds, with axial planar cleavage and horizontal stretching lineation deforming the earlier nappe structures and particularly the basal thrusts of each nappe unit. These folds are the result of a general post-nappe Hercynian N-S shortening which resulted as well in the antiformal doming of the gneissic Axial Zone. A structural study focusing on shear criteria shows that the E-W to ENE trending stretching lineation contemporaneous with the F2 folding is the result of a bulk coaxial deformation during a N-S shortening and cannot be related to a large ductile dextral or sinistral strike-slip fault.

Key concepts: Lineation, Sinistral and dextral, Geology, Nappe, Massif, Transpression, Seismology, Shear (geology)

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Plissement hercynien synschisteux post-nappe et étirement subhorizontal dans le versant sud de la Montagne Noire (Sud du Massif Central, France) — Research Paper | ScholarLens