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U–Pb zircon age of a granodioritic gneiss from Rimokojan at Stora Luleälven, Norrbotten County, northern Sweden
Sveriges geologiska undersökning.
Sveriges geologiska undersökning.
Swedish Museum of Natural History, Department of Geology.
Sveriges geologiska undersökning.
2018 (English)Report (Other academic)
Abstract [en]

A granodioritic gneiss from Rimokojan at Stora Luleälven north of Jokkmokk in the central part of Norrbotten County, has been dated using U–Pb SIMS analyses of zircon. The sampled gneiss occurs within a massif of granodioric to tonalitic gneisses together with strongly deformed basic dykes and intrusions of almost undeformed gabbro to diorite of the Haparanda suite. This rock association occurs in the southern part of a distinct magnetic anomaly in the area of the Muddus National Park. Analyses of oscillatory zoned zircon domains from the Rimokojan gneiss sample yielded a weighted average 207Pb/206Pb age of 2668 ± 3 Ma (2σ) which is interpreted to date the protolith at c. 2.67 Ga. This figure is similar to other age determinations of Archaean rocks in southeastern Norrbotten County (2.70–2.64 Ga). Field relations suggest that the gneiss protolith has been deformed during at least two different deformational events which both predate the emplacement of the 1.91–1.87 Ga Haparanda suite. Two analyses of low Th/U, cathodoluminescence (CL)-dark unzoned zircon rims from the same sample are interpreted to date a metamorphic event at c. 2.61 Ga.

Place, publisher, year, edition, pages
Uppsala: Sveriges geologiska undersökning , 2018. , p. 16
Series
SGU-rapport 2018 ; 19
Keywords [en]
Archaean, Svecokarelian orogeny, U–Pb, zircon, geochronology, gneiss, basic dykes
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3164OAI: oai:DiVA.org:nrm-3164DiVA, id: diva2:1272196
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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http://resource.sgu.se/produkter/sgurapp/s1819-rapport.pdf

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CiteExportLink to record
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