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A refined U-Pb age for the Stockholm granite at Frescati, east-central Sweden
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0002-1598-5231
2019 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 141, no 1, p. 40-47Article in journal (Refereed) Published
Abstract [en]

A sample of fine-grained grey Stockholm granite from the Frescati area just north of central Stockholm, east-central Sweden, earlier dated to 1803 +23/−19 Ma by the U-Pb zircon method using TIMS on multigrain fractions, has been reanalyzed using the Nordsim ion microprobe. The new age obtained, 1792±4 Ma, is more precise, and replaces the earlier highly discordant date. It agrees well with other ages for the formation of the Stockholm-type granites and related pegmatites, indicating an age of around 1.79 Ga for this late-orogenic Svecofennian granite magmatism. The Stockholm granite thus formed toward the end of the 1.83–1.79 Ga late Svecofennian metamorphic phase, and crosscuts earlier formed migmatitic gneiss structures in a brittle manner at the present-day level of exposure.

Place, publisher, year, edition, pages
2019. Vol. 141, no 1, p. 40-47
Keywords [en]
Stockholm granite; lateorogenic granites; granite-pegmatite (GP) suite; Svecofennian province
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3277DOI: 10.1080/11035897.2018.1555186OAI: oai:DiVA.org:nrm-3277DiVA, id: diva2:1313060
Available from: 2019-05-02 Created: 2019-05-02 Last updated: 2019-05-02Bibliographically approved

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Publisher's full texthttps://doi.org/10.1080/11035897.2018.1555186

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