Lyell Collection
Journal of the Geological Society
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
Right arrow Citation Map
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 BAIRD, A. W.
Right arrow Articles by McCAFFREY, K. I W.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1999; v. 156; issue.1; p. 11-14;
DOI: 10.1144/gsjgs.156.1.0011
© 1999 Geological Society of London

SPECIAL

Polyphase deformation and metamorphism in the Llyn Ogwen area of Snowdonia, North Wales

A. W. BAIRD & K. I W. McCAFFREY

School of Geological Sciences, Kingston University Penrhyn Road, Kingston upon Thames, Surrey KT1 2EE, UK (e-mail:A.Baird{at}kingston.ac.uk)

Structural mapping of Upper Ordovician (Caradoc) volcaniclastic rocks around Llyn Ogwen, North Wales has revealed a hitherto unrecorded, kilometre-scale, Ramsay 'type-3' refold pattern. Each phase of folding is associated with an axial planar low grade, metamorphic fabric. The Caradoc aged, sub-volcanic Ogwen microgranite, contains two fabrics which are contiguous with those in the metasedimentary rocks. Recognition of two tectono-metamorphic events may simply explain the discrete Late Silurian and Early Devonian isotopic ages for deformation in North Wales and has implications for models of Acadian tectonics and the use of K/Ar and 40Ar/39Ar dating techniques in slate belts.


Keywords: Wales, Caledonian Orogeny, polyphase processes, folding, metamorphism.




This article has been cited by other articles:


Home page
 Journal of the Geological SocietyHome page
M. B. Allen, M. B. ALLEN, G. I. ALSOP, and V. G. ZHEMCHUZHNIKOV
Dome and basin refolding and transpressive inversion along the Karatau Fault System, southern Kazakstan
Journal of the Geological Society, 2001; 158: 83 - 95.
[Abstract] [Full Text] [PDF]