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PLATE TECTONICS BEFORE 2.0 Ga: EVIDENCE FROM PALEOMAGNETISM OF CRATONS WITHIN SUPERCONTINENT NUNA

Mitchell, Ross N.; Bleeker, Wouter; Van Breemen, Otto; Lecheminant, Tony N.; Peng, Peng; Nilsson, Mimmi LU and Evans, David A. D. (2014) In American Journal of Science 314(4). p.878-894
Abstract
Laurentia, the core of Paleo- to Mesoproterozoic supercontinent Nuna, has remained largely intact since assembly 2.0 to 1.8 billion years ago [Ga]. For earlier times, previous paleomagnetic data on poorly dated Paleoproterozoic mafic intrusions yielded ambiguous estimates of the amount of separation between key cratons within Nuna such as the Slave and Superior. Recent developments in paleomagnetism and U-Pb baddeleyite geochronology, including new results reported herein, yield sufficiently precise data to generate partial apparent polar wander paths for both the Slave and Superior craton from 2.2 to 2.0 Ga. Our new apparent polar wander comparison confirms earlier speculations that processes similar to plate tectonics, with relative... (More)
Laurentia, the core of Paleo- to Mesoproterozoic supercontinent Nuna, has remained largely intact since assembly 2.0 to 1.8 billion years ago [Ga]. For earlier times, previous paleomagnetic data on poorly dated Paleoproterozoic mafic intrusions yielded ambiguous estimates of the amount of separation between key cratons within Nuna such as the Slave and Superior. Recent developments in paleomagnetism and U-Pb baddeleyite geochronology, including new results reported herein, yield sufficiently precise data to generate partial apparent polar wander paths for both the Slave and Superior craton from 2.2 to 2.0 Ga. Our new apparent polar wander comparison confirms earlier speculations that processes similar to plate tectonics, with relative motion between the Slave and Superior cratons, were operative leading up to the final assembly of supercontinent Nuna. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Slave craton, Superior craton, Laurentia, U-Pb geochronology, paleomagnetism, plate tectonics
in
American Journal of Science
volume
314
issue
4
pages
878 - 894
publisher
Amer Journal Science
external identifiers
  • wos:000345105100003
  • scopus:84902969290
ISSN
0002-9599
DOI
10.2475/04.2014.03
language
English
LU publication?
yes
id
d1a21e7b-b9f7-4eef-918e-99e0331a688a (old id 4985802)
date added to LUP
2015-01-26 13:49:58
date last changed
2017-11-19 03:51:55
@article{d1a21e7b-b9f7-4eef-918e-99e0331a688a,
  abstract     = {Laurentia, the core of Paleo- to Mesoproterozoic supercontinent Nuna, has remained largely intact since assembly 2.0 to 1.8 billion years ago [Ga]. For earlier times, previous paleomagnetic data on poorly dated Paleoproterozoic mafic intrusions yielded ambiguous estimates of the amount of separation between key cratons within Nuna such as the Slave and Superior. Recent developments in paleomagnetism and U-Pb baddeleyite geochronology, including new results reported herein, yield sufficiently precise data to generate partial apparent polar wander paths for both the Slave and Superior craton from 2.2 to 2.0 Ga. Our new apparent polar wander comparison confirms earlier speculations that processes similar to plate tectonics, with relative motion between the Slave and Superior cratons, were operative leading up to the final assembly of supercontinent Nuna.},
  author       = {Mitchell, Ross N. and Bleeker, Wouter and Van Breemen, Otto and Lecheminant, Tony N. and Peng, Peng and Nilsson, Mimmi and Evans, David A. D.},
  issn         = {0002-9599},
  keyword      = {Slave craton,Superior craton,Laurentia,U-Pb geochronology,paleomagnetism,plate tectonics},
  language     = {eng},
  number       = {4},
  pages        = {878--894},
  publisher    = {Amer Journal Science},
  series       = {American Journal of Science},
  title        = {PLATE TECTONICS BEFORE 2.0 Ga: EVIDENCE FROM PALEOMAGNETISM OF CRATONS WITHIN SUPERCONTINENT NUNA},
  url          = {http://dx.doi.org/10.2475/04.2014.03},
  volume       = {314},
  year         = {2014},
}