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The Ulvo Gabbro Complex of the 1.27-1.25 Ga Central Scandinavian Dolerite Group (CSDG): Intrusive age, magmatic setting and metamorphic history

Hogmalm, KJ ; Söderlund, Ulf LU ; Larson, SA ; Meurer, WP ; Hellstrom, FA and Claeson, DT (2006) In GFF 128. p.1-6
Abstract
The Ulvo Gabbro Complex (UGC) belongs to the 1.27-1.25 Ga Central Scandinavian Dolerite Group (CSDG), which manifests a major event of intra-cratonic mafic magmatism possibly related to break-up between Laurentia and Baltica. Lopolithic, layered intrusions of the UGC outcrop in east central Sweden and west central Finland. Fresh baddeleyite grains in a pegmatoidal gabbro were dated by the TIMS U-Pb method. The age of 1256.2 +/- 1.1 Ma is interpreted to date crystallisation of the UGC, and is consistent with the age of other mafic intrusions of the CSDG in Vasterbotten and south-western Finland. Previously reported K-Ar biotite data confirm that the UGC was not heated above the blocking temperature for Ar diffusion in biotite (similar to... (More)
The Ulvo Gabbro Complex (UGC) belongs to the 1.27-1.25 Ga Central Scandinavian Dolerite Group (CSDG), which manifests a major event of intra-cratonic mafic magmatism possibly related to break-up between Laurentia and Baltica. Lopolithic, layered intrusions of the UGC outcrop in east central Sweden and west central Finland. Fresh baddeleyite grains in a pegmatoidal gabbro were dated by the TIMS U-Pb method. The age of 1256.2 +/- 1.1 Ma is interpreted to date crystallisation of the UGC, and is consistent with the age of other mafic intrusions of the CSDG in Vasterbotten and south-western Finland. Previously reported K-Ar biotite data confirm that the UGC was not heated above the blocking temperature for Ar diffusion in biotite (similar to 250 degrees C) after similar to 1.2 Ga. This suggests that UGC was virtually unaffected by later geological events and that magmatic textures and mineralogy have not been modified after solidification. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
intrusion, layered, U-Pb, CSDG, baddeleyite, Ulvo Gabbro Complex, ulvospinel
in
GFF
volume
128
pages
1 - 6
publisher
Taylor & Francis
external identifiers
  • wos:000237511000001
  • scopus:33646529635
ISSN
2000-0863
language
English
LU publication?
yes
id
6babe9c7-8464-43ca-8a37-324075b86d50 (old id 409662)
alternative location
http://www.gff-online.se/site/article.asp?articleID=850
date added to LUP
2016-04-01 11:43:02
date last changed
2020-07-22 01:27:39
@article{6babe9c7-8464-43ca-8a37-324075b86d50,
  abstract     = {The Ulvo Gabbro Complex (UGC) belongs to the 1.27-1.25 Ga Central Scandinavian Dolerite Group (CSDG), which manifests a major event of intra-cratonic mafic magmatism possibly related to break-up between Laurentia and Baltica. Lopolithic, layered intrusions of the UGC outcrop in east central Sweden and west central Finland. Fresh baddeleyite grains in a pegmatoidal gabbro were dated by the TIMS U-Pb method. The age of 1256.2 +/- 1.1 Ma is interpreted to date crystallisation of the UGC, and is consistent with the age of other mafic intrusions of the CSDG in Vasterbotten and south-western Finland. Previously reported K-Ar biotite data confirm that the UGC was not heated above the blocking temperature for Ar diffusion in biotite (similar to 250 degrees C) after similar to 1.2 Ga. This suggests that UGC was virtually unaffected by later geological events and that magmatic textures and mineralogy have not been modified after solidification.},
  author       = {Hogmalm, KJ and Söderlund, Ulf and Larson, SA and Meurer, WP and Hellstrom, FA and Claeson, DT},
  issn         = {2000-0863},
  language     = {eng},
  pages        = {1--6},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {The Ulvo Gabbro Complex of the 1.27-1.25 Ga Central Scandinavian Dolerite Group (CSDG): Intrusive age, magmatic setting and metamorphic history},
  url          = {http://www.gff-online.se/site/article.asp?articleID=850},
  volume       = {128},
  year         = {2006},
}