Skip to Main Content
Book Chapter

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

By
F. Le Hebel
F. Le Hebel
Géosciences Rennes, U.M.R. 6118 C.N.R.S., Université de Rennes 1, 35042, Rennes cedex, France
Search for other works by this author on:
D. Gapais
D. Gapais
Géosciences Rennes, U.M.R. 6118 C.N.R.S., Université de Rennes 1, 35042, Rennes cedex, France
Search for other works by this author on:
S. Fourcade
S. Fourcade
Géosciences Rennes, U.M.R. 6118 C.N.R.S., Université de Rennes 1, 35042, Rennes cedex, France
Search for other works by this author on:
R. Capdevila
R. Capdevila
Géosciences Rennes, U.M.R. 6118 C.N.R.S., Université de Rennes 1, 35042, Rennes cedex, France
Search for other works by this author on:
Published:
January 01, 2002

Abstract

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 décollement 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.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives

S. de Meer
S. de Meer
Utrecht University, The Netherlands
Search for other works by this author on:
M. R. Drury
M. R. Drury
Utrecht University, The Netherlands
Search for other works by this author on:
J. H. P. de Bresser
J. H. P. de Bresser
Utrecht University, The Netherlands
Search for other works by this author on:
G. M. Pennock
G. M. Pennock
Utrecht University, The Netherlands
Search for other works by this author on:
Geological Society of London
Volume
200
ISBN electronic:
9781862396081
Publication date:
January 01, 2002

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal