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  • Buchan, K. L.Geological Survey of Canada (author)

Comparing the drift of Laurentia and baltica in the Proterozoic : the importance of key palaeomagnetic poles

  • Article/chapterEnglish2000

Publisher, publication year, extent ...

  • 2000
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:ltu-12263
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-12263URI
  • https://doi.org/10.1016/S0040-1951(00)00032-9DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Validerad; 2000; 20070316 (ysko)
  • Key palaeomagnetic poles are defined as those which pass basic reliability criteria and are precisely and accurately dated. They allow a more rigorous analysis of Precambrian continental drift and continental reconstructions than the traditional apparent polar wander path (APWP) approach using mostly non-key poles. Between ca. 2.45 and 2.00 Ga in the early Palaeoproterozoic, key poles define the drift of the Archaean Superior craton of Laurentia, yielding a result that is quite unlike the drift interpreted in earlier studies using the APWP method. There are no early Palaeoproterozoic key poles for the other Archaean cratons that amalgamated to form Laurentia and Baltica prior to 1.8 Ga, so that a rigorous test of early Palaeoproterozoic reconstruction models is not possible. Key poles from Laurentia between ca. 1.46 and 1.267 Ga and Baltica between 1.63 and 1.265 Ga help to define, in a preliminary fashion, the early Mesoproterozoic drift of the two shields. The key pole age match at ca. 1.265 Ga is consistent with Baltica located adjacent to eastern Greenland, and geological considerations suggest that the most reasonable fit aligns the Labradorian belt of Laurentia with the Gothian belt of Baltica. Although there is limited support from non-key poles and key poles that are not matched in age for such a fit as early as ca. 1.8 Ga, no rigorous assessment will be possible until a match in key pole ages is achieved. In the late Mesoproterozoic to Neoproterozoic, Laurentia's drift is reasonably well documented by seven key poles between 1.235 and 0.73 Ga. There are no key poles in this period from Baltica, however, so that a ≈90° clockwise rotation of Baltica relative to Laurentia between 1.265 and 1.0 Ga, widely used in the literature, cannot be confirmed.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Mertanen, S.Geological Survey of Finland (author)
  • Park, R. G.Department of Earth Sciences, Keele University (author)
  • Pesonen, L. J.Geological Survey of Finland (author)
  • Elming, Sten-åkeLuleå tekniska universitet,Geovetenskap och miljöteknik(Swepub:ltu)sael (author)
  • Abrahamsen, N.University of Aarhus (author)
  • Bylund, G.Lunds universitet (author)
  • Geological Survey of CanadaGeological Survey of Finland (creator_code:org_t)

Related titles

  • In:Tectonophysics319:3, s. 167-1980040-19511879-3266

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Buchan, K. L.
Mertanen, S.
Park, R. G.
Pesonen, L. J.
Elming, Sten-åke
Abrahamsen, N.
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Bylund, G.
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About the subject
NATURAL SCIENCES
NATURAL SCIENCES
and Earth and Relate ...
and Geophysics
Articles in the publication
Tectonophysics
By the university
Luleå University of Technology

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Buchan, K. L.
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