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Palaeomagnetic configuration of continents during the Proterozoic
Division of Geophysics, Department of Physical Sciences, University of Helsinki.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Geological Survey of Finland.
Tectonics Special Research Centre, The University of Western Australia.
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2003 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 375, no 1-4, p. 289-324Article in journal (Refereed) Published
Abstract [en]

Palaeomagnetic data are used to study the configurations of continents during the Proterozoic. Applying stringent reliability criteria, the positions of the continents at 12 times in the 2.45- to 1.00-Ga period have been constructed. The continents lie predominantly in low to intermediate latitudes. The sedimentological indicators of palaeoclimate are generally consistent with the palaeomagnetic latitudes, with the exception of the Early Proterozoic, when low latitude glaciations took place on several continents. The Proterozoic continental configurations are generally in agreement with current geological models of the evolution of the continents. The data suggest that three large continental landmasses existed during the Proterozoic. The oldest one is the Neoarchaean Kenorland, which comprised at least Laurentia, Baltica, Australia and the Kalahari craton. The protracted breakup of Kenorland during the 2.45- to 2.10-Ga interval is manifested by mafic dykes and sedimentary rift-basins on many continents. The second ‘supercontinental' landmass is Hudsonland (also known as Columbia). On the basis of purely palaeomagnetic data, this supercontinent consisted of Laurentia, Baltica, Ukraine, Amazonia and Australia and perhaps also Siberia, North China and Kalahari. Hudsonland existed from 1.83 to ca. 1.50-1.25 Ga. The youngest assembly is the Neoproterozoic supercontinent of Rodinia, which was formed by continent-continent collisions during ≈1.10-1.00 Ga and which involved most of the continents. A new model for its assembly and configuration is presented, which suggests that multiple Grenvillian age collisions took place during 1.10-1.00 Ga. The configurations of Kenorland, Hudsonland and Rodinia depart from each other and also from the Pangaea assembly. The tectonic styles of their amalgamation are also different reflecting probable changes in sizes and thicknesses of the cratonic blocks as well as changes in the thermal conditions of the mantle through time.

Place, publisher, year, edition, pages
2003. Vol. 375, no 1-4, p. 289-324
National Category
Geophysics
Research subject
Applied Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-14118DOI: 10.1016/S0040-1951(03)00343-3ISI: 000186806300016Scopus ID: 2-s2.0-0242709012Local ID: d7299010-d402-11db-b6e3-000ea68e967bOAI: oai:DiVA.org:ltu-14118DiVA, id: diva2:987072
Note
Validerad; 2003; Bibliografisk uppgift: Orogenic Belts, Regional and Global Tectonics: A Memorial Volume to Chris McAulay Powell; 20070316 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Elming, Sten-åke

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