Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Sans, M.
Right arrow Articles by Santanach, P.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 1996; v. 100; p. 65-76;
DOI: 10.1144/GSL.SP.1996.100.01.06
© 1996 Geological Society of London

Outcrop, Mine and Borehole Studies

Internal structure of a detachment horizon in the most external part of the Pyrenean fold and thrust belt (northern Spain)

M. Sans1,2, A. L. Sánchez2 & P. Santanach1

1 Departament de Geologia Dinàmica, Geofísica i Paleontologia. Universitat de Barcelona, Barcelona 08071, Spain
2 Súria K SA, Sales y Potasas, Súria, Barcelona 08260, Spain

The thick Eocene Cardona salt forms the detachment horizon of the most external part of the Pyrenean fold and thrust belt. This salt horizon forms the cores of anticlines and is intensively mined for potash. The study of the structure of the salt layer at three sites (Cabanasses, Súria-Shaft IV and Balsareny underground mines) reveals that the metric and decametric scale structures are consistent with deformation in a shear zone (detachment horizon) with a shear sense of top-to-the-south and not related to compressional or diapiric folding. A further study shows that these structures are later modified by larger wavelength folds and thrusts which have a surface expression. The total horizontal shortening in the two anticlines studied (Súria and El Guix) is a minimum of 750 m. All the folds developed in the detachment horizon have horizontal axes which are normal to the shear direction. This contrasts with folds developed in detachment horizons with intense shearing, where folds with axes parallel to shear direction are common.





This article has been cited by other articles:


Home page
 Geological Society, London, Special PublicationsHome page
L. Miralles, M. Sans, J. J. Pueyo, and P. Santanach
Recrystallization salt fabric in a shear zone (Cardona diapir, southern Pyrenees, Spain)
Geological Society, London, Special Publications, 2000; 174: 149 - 167.
[Abstract] [PDF]