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 NORDGULEN, O.
Right arrow Articles by SCHOUENBORG, B.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Journal of the Geological Society; 1990; v. 147; issue.3; p. 439-450;
DOI: 10.1144/gsjgs.147.3.0439
© 1990 Geological Society of London

Article

The Caledonian Heilhornet Pluton, north-central Norway: geological setting, radiometric age and implications for the Scandinavian Caledonides

Ø. NORDGULEN1 & B. SCHOUENBORG2

1 Norwegian Geological Survey, PO Box 3006, N-7002 Trondheim, Norway
2 Institute of Geology, University of Lund, Sölvegatan 13, S-223 62 Lund, Sweden

The Heilhornet Pluton is a medium-sized (c. 50 km2), sub-circular, discordant intrusion which penetrates the thrust zone separating the Helgeland Nappe Complex from paragneisses in the Vestranden region, north-central Norway. The intrusion consists of biotite ± hornblende granite and ranges in composition from 61.5 to 72.5 wt.% Si02 The initial Sr-ratio (c. 0.7070) shows that crustal sources have been involved in the petrogenesis of the granite. A U-Pb zircon age of 444 ± 11 Ma for the pluton indicates that juxtaposition of the nappe complex with metasedimentary rocks in Vestranden took place prior to or during the late Ordovician. A consequence of this is that the general correlation of the metasedimentary rocks in Vestranden with the Seve Nappes must be revised. Final eastward thrusting of the complex, together with a yet unknown part of the Vestranden supracrustal sequence, probably took place during the middle Silurian to early Devonian, Scandian, orogenic event.





This article has been cited by other articles:


Home page
 GeosphereHome page
C. G. Barnes, C. D. Frost, A. S. Yoshinobu, K. McArthur, M. A. Barnes, C. M. Allen, O. Nordgulen, and T. Prestvik
Timing of sedimentation, metamorphism, and plutonism in the Helgeland Nappe Complex, north-central Norwegian Caledonides
Geosphere, 2007; 3: 683 - 703.
[Abstract] [Full Text] [PDF]

Home page
 Geological Society of America MemoirsHome page
D. Roberts, O. Nordgulen, and V. Melezhik
The Uppermost Allochthon in the Scandinavian Caledonides: From a Laurentian ancestry through Taconian orogeny to Scandian crustal growth on Baltica
Geological Society of America Memoirs, 2007; 200: 357 - 377.
[Abstract] [Full Text] [PDF]

Home page
 Geological MagazineHome page
G. B. Meyer, G. B. MEYER, T. GRENNE, and R. B. PEDERSEN
Age and tectonic setting of the Nesaa Batholith: implications for Ordovician arc development in the Caledonides of Central Norway
Geological Magazine, 2003; 140: 573 - 594.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
C. G. BARNES, A. S. YOSHINOBU, T. PRESTVIK, O. NORDGULEN, H. R. KARLSSON, and B. SUNDVOLL
Mafic Magma Intraplating: Anatexis and Hybridization in Arc Crust, Bindal Batholith, Norway
J. Petrology, 2002; 43: 2171 - 2190.
[Abstract] [Full Text] [PDF]

Home page
 Journal of the Geological SocietyHome page
O. NORDGULEN, M. E. BICKFORD, A. L. NISSEN, and G. L. WORTMAN
U-Pb zircon ages from the Bindal Batholith, and the tectonic history of the Helgeland Nappe Complex, Scandinavian Caledonides
Journal of the Geological Society, 1993; 150: 771 - 783.
[Abstract] [PDF]

Home page
 Journal of the Geological SocietyHome page
M. B. STEPHENS, K. KULLERUD, and S. CLAESSON
Early Caledonian tectonothermal evolution in outboard terranes, central Scandinavian Caledonides: new constraints from U-Pb zircon dates
Journal of the Geological Society, 1993; 150: 51 - 56.
[Abstract] [PDF]