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Chronology and geochemistry of late Svecofennian processes in northern Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
1989 (English)In: Geologiska föreningens i Stockholm förhandlingar, ISSN 0016-786X, Vol. 111, no 4, p. 347-354Article in journal (Refereed) Published
Abstract [en]

Radiometric and geochemical data have been used to characterize the concluding stages of the Svecofennian orogeny in northern Sweden. U-Pb zircon ages of 1879 +- 7 and 1858 +- 9 Ma have been obtained from two unfoliated granitoids of the North Svecofennian Sub-province. The ages are distinctly different from each other and indicate late- to post-orogenic Svecofennian magmatic activity 1860 Ma ago. The older rock type forms a diorite-quartz monzonite-adamellite trend, while samples of the younger type are adamellitic. Trace element data are not in accordance with a model age where the younger type is formed by continuous magmatic differentiation from rocks of the older type. We propose a new 1910-1860 Ma delimitation for the emplacement of all igneous Svecofennian rocks in northern Sweden and conclude that the widespread potassic 1800-1770 Ma granites of that area should not be considered part of the Svecofennian orogeny, but of some later and separate event.

Place, publisher, year, edition, pages
1989. Vol. 111, no 4, p. 347-354
National Category
Geochemistry
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-8775DOI: 10.1080/11035898909453134Local ID: 74f7f520-5711-11dc-a7ae-000ea68e967bOAI: oai:DiVA.org:ltu-8775DiVA, id: diva2:981713
Note
Godkänd; 1989; 20070830 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Öhlander, Björn

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  • apa
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