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 Klaper, E. M.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 1990; v. 54; p. 167-173;
DOI: 10.1144/GSL.SP.1990.054.01.16
© 1990 Geological Society of London

Instabilities and Localization

Reaction-enhanced formation of eclogite-facies shear zones in granulite-facies anorthosites

Eva M. Klaper

Institute of Geology, Bern University, Baltzerstr. 1, 3012 Bern, Switzerland

Infiltration of a dry granulite-facies anorthosite complex by a hydrous fluid phase under high pressure was crucial to start (a) an eclogitization process which led to the breakdown of plagioclase and the formation of either dense or hydrated minerals and (b) dynamic recrystallization of plagioclase in shear zones. Reaction products of the eclogitization process are related spatially to cracks and shear zones. The reduction in grain size during dynamic recrystallization, the foliation development in shear zones and the occurrence of new ‘soft’ and/or dense minerals changed the mechanical properties (e.g. ductility) of the rocks considerably.

The initiation of detachment and thrusting in the lower crust may be an important large scale consequence of such localized processes.





This article has been cited by other articles:


Home page
 Geological Society, London, Special PublicationsHome page
C. J. Carson and J. J. Ague
Early Palaeozoic metasomatism of the Archaean Napier Complex, East Antarctica
Geological Society, London, Special Publications, 2008; 308: 283 - 316.
[Abstract] [Full Text] [PDF]