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New U–Pb baddeleyite age, and AMS and paleomagnetic data for dolerites in the Lake Onega region belonging to the 1.98–1.95 Ga regional Pechenga–Onega Large Igneous Province

Lubnina, Natalia V.; Stepanova, Alexandra V.; Ernst, Richard E.; Nilsson, Mimmi LU and Söderlund, Ulf LU (2015) In GFF 138(1). p.54-78
Abstract

A new U–Pb baddeleyite age of 1970 ± 3 Ma for the Unoi dolerite sill of the Onega structure of Karelia craton matches other 1.98–1.95 Ga units across the Kola craton (Pechenga) and widely separated parts of the Karelian craton, including the Lake Onega sill area and a extensive NW-trending dolerite dyke swarm. Herein these coeval units are combined into the Pechenga–Onega Large Igneous Province. The sills in the Lake Onega area exhibit similar geochemical patterns, although the Unoi dolerite sills appear less contaminated and less differentiated than the Pudozhgora intrusion, Gabnev sill and Koikary-Svatnavolok and Palieyeozero sills but are similar to other doleritic sills in the northern part of the Onega structure. New AMS data from... (More)

A new U–Pb baddeleyite age of 1970 ± 3 Ma for the Unoi dolerite sill of the Onega structure of Karelia craton matches other 1.98–1.95 Ga units across the Kola craton (Pechenga) and widely separated parts of the Karelian craton, including the Lake Onega sill area and a extensive NW-trending dolerite dyke swarm. Herein these coeval units are combined into the Pechenga–Onega Large Igneous Province. The sills in the Lake Onega area exhibit similar geochemical patterns, although the Unoi dolerite sills appear less contaminated and less differentiated than the Pudozhgora intrusion, Gabnev sill and Koikary-Svatnavolok and Palieyeozero sills but are similar to other doleritic sills in the northern part of the Onega structure. New AMS data from sills are consistent with emplacement along the same NW–SE trend as the dykes, consistent with the dykes acting as their feeder system. Paleomagnetic data obtained on 1.98–1.95 Ga magmatic rocks result in a new robust paleopole for the Karelian craton and accentuate its variable paleolatitude and paleoorientation during the Paleoproterozoic.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
AMS, Karelian craton, Large Igneous Province, Paleomagnetism, Paleoproterozoic, Pechenga–Onega LIP, U–Pb baddeleyite
in
GFF
volume
138
issue
1
pages
25 pages
publisher
Geological Society of Sweden
external identifiers
  • scopus:84959089591
ISSN
1103-5897
DOI
10.1080/11035897.2015.1129549
language
English
LU publication?
yes
id
ac1cb6e5-0be5-4073-9c8a-bc2cc79acae2
date added to LUP
2016-05-23 12:15:03
date last changed
2017-10-01 05:19:56
@article{ac1cb6e5-0be5-4073-9c8a-bc2cc79acae2,
  abstract     = {<p>A new U–Pb baddeleyite age of 1970 ± 3 Ma for the Unoi dolerite sill of the Onega structure of Karelia craton matches other 1.98–1.95 Ga units across the Kola craton (Pechenga) and widely separated parts of the Karelian craton, including the Lake Onega sill area and a extensive NW-trending dolerite dyke swarm. Herein these coeval units are combined into the Pechenga–Onega Large Igneous Province. The sills in the Lake Onega area exhibit similar geochemical patterns, although the Unoi dolerite sills appear less contaminated and less differentiated than the Pudozhgora intrusion, Gabnev sill and Koikary-Svatnavolok and Palieyeozero sills but are similar to other doleritic sills in the northern part of the Onega structure. New AMS data from sills are consistent with emplacement along the same NW–SE trend as the dykes, consistent with the dykes acting as their feeder system. Paleomagnetic data obtained on 1.98–1.95 Ga magmatic rocks result in a new robust paleopole for the Karelian craton and accentuate its variable paleolatitude and paleoorientation during the Paleoproterozoic.</p>},
  author       = {Lubnina, Natalia V. and Stepanova, Alexandra V. and Ernst, Richard E. and Nilsson, Mimmi and Söderlund, Ulf},
  issn         = {1103-5897},
  keyword      = {AMS,Karelian craton,Large Igneous Province,Paleomagnetism,Paleoproterozoic,Pechenga–Onega LIP,U–Pb baddeleyite},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {54--78},
  publisher    = {Geological Society of Sweden},
  series       = {GFF},
  title        = {New U–Pb baddeleyite age, and AMS and paleomagnetic data for dolerites in the Lake Onega region belonging to the 1.98–1.95 Ga regional Pechenga–Onega Large Igneous Province},
  url          = {http://dx.doi.org/10.1080/11035897.2015.1129549},
  volume       = {138},
  year         = {2015},
}