Quick
Search: 		  
advanced search
 GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help 
  Journal of the Geological Society   Don't get GSW? Talk to your librarian.
JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Journal of the Geological Society; November 1984; v. 141; no. 6; p. 1015-1032; DOI: 10.1144/gsjgs.141.6.1015
© 1984 Geological Society of London
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 reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Brekke, H.
Right arrow Articles by Hertogen, J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation

Article

Lower Palaeozoic convergent plate margin volcanism on Bømlo, SW Norway, and its bearing on the tectonic environments of the Norwegian Caledonides

Harald Brekke, Harald Furnes, Jan Nordås and Jan Hertogen

The island of Bømlo presents a geological section through a Caledonian convergent plate margin. The Lykling Ophiolite and the overlying ensimatic are sequence of the Geitung Unit were emplaced onto the Baltic Shield, probably in Arenig times. After a period of deep erosion, the Basin and Range type volcanics of the Siggjo Complex were deposited followed by a hiatus in the magmatism and a weak but widespread phase of vertical tectonism, possibly due to the successful subduction of a spreading ridge. At the top of the mainly sedimentary Ashgill/Llandovery Vikafjord Group, the Basin and Range type volcanism resumed. This was probably preceded immediately by the calc-alkaline, subaerial volcanism at the base of the Langevåg Group, which passes stratigraphically upwards into basin-fill lithologies such as submarine volcaniclastics, cherts, turbidites and submarine greenstones of chemistry compatible with the early stages of ensialic back-arc basin development. The stratigraphy and volcanism are discussed in context with recent views on the rest of the Norwegian Caledonides.




This article has been cited by other articles:


Home page
 J PetrologyHome page
S. P. JOHNSON and G. J. H. OLIVER
High fO2 Metasomatism During Whiteschist Metamorphism, Zambezi Belt, Northern Zimbabwe
J. Petrology, February 1, 2002; 43(2): 271 - 290.
[Abstract] [Full Text] [PDF]

Home page
 Journal of the Geological SocietyHome page
O. NORDGULEN and B. SCHOUENBORG
The Caledonian Heilhornet Pluton, north-central Norway: geological setting, radiometric age and implications for the Scandinavian Caledonides
Journal of the Geological Society, June 1, 1990; 147(3): 439 - 450.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
D. Powell, T. B. Andersen, A. A. Drake Jr, L. Hall, and J. D. Keppie
The age and distribution of basement rocks in the Caledonide orogen of the N Atlantic
Geological Society, London, Special Publications, January 1, 1988; 38(1): 63 - 74.
[Abstract] [PDF]

Home page
 Geological Society, London, Special PublicationsHome page
C. J. Stillman
Ordovician to Silurian volcanism in the Appalachian--Caledonian orogen
Geological Society, London, Special Publications, January 1, 1988; 38(1): 275 - 290.
[Abstract] [PDF]


JOURNAL HOME HELP CONTACT PUBLISHER SUBSCRIBE ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by Geological Society of London