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Early Proterozoic crust-mantle interaction at a continental margin in northern Sweden
Laboratoriet för Isotopgeologi, Naturhistoriska Riksmuseet, Stockholm.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
1989 (English)In: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 45, no 1-3, p. 19-26Article in journal (Refereed) Published
Abstract [en]

On the basis of recent geochemical and Sm-Nd isotopic data, alternative models for the early Proterozoic evolution of the Archaean craton of the Baltic Shield and its marginal areas in northern Sweden are discussed. Before the deposition of a craton cover and the subsequent Svecofennian orogenic activity, the Archaean areas probably formed a continuous domain. The 1.89-1.86 Ga old early Svecofennian granitoids found close to exposed Archaean rocks were created largely by the remobilization of Archaean crust. To the south of the Archaean Domain, however, chronologically equivalent granitoids are made up of matter with short crustal residence times. That area, the Skellefte district, represents a new addition to the continental crust of the Baltic Shield ≈ 1.90 Ga ago. The particulars of the crustal accretion process are still controversial. However, recent data indicate different tectonic developments in the Skellefte district and in the vicinity of the Archaean-Proterozoic boundary farther north. Apparently, the one-time edge of the Archaean craton was situated somewhere between these two areas, but appears to have had a rather more northerly position than previously assumed.

Place, publisher, year, edition, pages
1989. Vol. 45, no 1-3, p. 19-26
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-3142DOI: 10.1016/0301-9268(89)90028-4ISI: A1989CA84700003Scopus ID: 2-s2.0-0024879660Local ID: 0edddf10-dd2d-11db-9cae-000ea68e967bOAI: oai:DiVA.org:ltu-3142DiVA, id: diva2:975998
Note
Godkänd; 1989; Bibliografisk uppgift: Papers from the meeting on Proterozoic geochemistry. Ed. by Roland Gorbatschev; 20070328 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Öhlander, Björn

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