Strain and deformation mechanisms in the Variscan nappes of Vendée, South Brittany, France

Vauchez, Alain; Maillet, Daniel; Sougy, Jean

doi:10.1016/0191-8141(87)90041-1

Cited by 22 publications

(23 citation statements)

References 27 publications

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“…lineation associated with overall westwarddirected shear (Burg 1981;Brun & Burg 1982;Vauchez et al 1987) (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 96%

“…At all scales, structures attest to extensive processes of dissolution-crystallisation (see also Vauchez et al 1987). Feldspar porphyroclasts show crystallizations of quartz and (or) feldspar in shadow zones and in fractures at high angle to the principal stretch direction (Fig.…”

Section: Metavolcanicsmentioning

confidence: 97%

“…Despite recrystallization, quartz fibres can show significant concentrations of (C) axes at low angle to the stretching lineation (A1, Fig. 5) (Vauchez et al 1987). As intracrystalline (C) slip is not expected because of the low FLUID-ASSISTED LARGE STRAINS 89 Fig.…”

Section: Syn-kinematic Vein Arraysmentioning

confidence: 97%

“…Associated shear criteria mainly indicate top-to-the-west shearing (Fig. 2a) (Burg 1981;Brun & Burg 1982;Vauchez et al 1987). Finite strains are large, the stretching recorded by truncated feldspar phenocrysts being commonly of the order of 300-400% or more (Burg 1981).…”

Section: Metavolcanicsmentioning

confidence: 99%

“…Finite strains are large, the stretching recorded by truncated feldspar phenocrysts being commonly of the order of 300-400% or more (Burg 1981). Remnants of low-strain domains are very rare (Vauchez et al 1987).…”

Section: Metavolcanicsmentioning

confidence: 99%

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Fluid-assisted large strains in a crustal-scale décollement (Hercynian Belt of South Brittany, France)

Hebel

Gapais

Fourcade

et al. 2002

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Crustal deformations often occur along gently-dipping shear zones, where the scale of fluid transfers and the coupling between deformations and fluid availability are important questions. We present a structural and geochemical study of felsic rocks deformed at about 350-400°C within a crustal-scale d&ollement zone from the Hercynian Belt of South Brittany. At regional scale, deformations resulted in large distributed strains accumulated by dissolution-crystallization of quartz and feldspars. Mass transfers produced veins growing parallel to the foliation. Veins were major precipitation zones, while adjacent rocks were the main zones of dissolution. Deformation patterns, vein mineralogy, and oxygen isotope data show that both the amount of fluids and the scale of fluid flow were limited, and that the dominant transfer mechanism was diffusion. Results suggest that the deformation zone has acted as a trap for early fluids rather than as a syn-kinematic fluid channel.The existence of close relationships between fluid movements and crustal deformation is well established (Beach 1976;Fyfe et al. 1978;Etheridge et al.

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“…lineation associated with overall westwarddirected shear (Burg 1981;Brun & Burg 1982;Vauchez et al 1987) (Fig. 1).…”

Section: Geological Settingmentioning

confidence: 96%

Section: Metavolcanicsmentioning

confidence: 97%

Section: Syn-kinematic Vein Arraysmentioning

confidence: 97%

Section: Metavolcanicsmentioning

confidence: 99%

Section: Metavolcanicsmentioning

confidence: 99%