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U-Pb SIMS dating of some granitoids from eastern Blekinge, southern Sweden
Swedish Museum of Natural History, Department of Geology.ORCID iD: 0000-0002-1598-5231
2016 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 138, no 3, 430-444 p.Article in journal (Refereed) Published
Abstract [en]

Zircons from seven granitoids in eastern Blekinge have been dated using secondary ion mass spectrometry. The analyzed rocks include one Småland granitoid from north of the Småland-Blekinge Deformation Zone (SBDZ), two samples of megacrystic “Filipstad-type” granite from south of that zone, and one sample each of the “Småland-type” Rödeby, Almö, Tjurkö and Jämjö granites. The results yield a crystallization age of 1776 ± 6 Ma for the Småland granitoid, and crystallization ages between 1770 ± 4 and 1758 ± 6 Ma for the other granitoids, in most cases substantially older than previous TIMS ages. These data show that the “Småland-type” granitoids in eastern Blekinge are similar in age to the surrounding Tving granitoids, and the more felsic of them may represent late-stage differentiates belonging to the same magmatic suite. As the Tving granitoids show differences both in degree of deformation, in geochemistry and possibly in age, when compared with the Småland granitoids north of the SBDZ, it is suggested that these represent two separate but closely related igneous suites, which could both be included within a TIB-1 supersuite.

The investigated zircons showed very limited signs of metamorphic overgrowths, and no metamorphic ages could be determined. However, the combined evidence from field observations combined with earlier U-Pb geochronology would suggest the presence of two separate metamorphic episodes in Blekinge, one in close connection with the formation of these rocks at 1.76 – 1.75 Ga, and one connected to the intrusion of the Karlshamn granitoid suite at around 1.45 Ga.

Place, publisher, year, edition, pages
Taylor & Francis, 2016. Vol. 138, no 3, 430-444 p.
Keyword [en]
U-Pb zircon, SIMS dating, Tving granitoids, Småland granitoids, Blekinge
National Category
Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-1820DOI: 10.1080/11035897.2016.1146328OAI: oai:DiVA.org:nrm-1820DiVA: diva2:957823
Available from: 2016-09-05 Created: 2016-09-05 Last updated: 2016-09-05Bibliographically approved

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Publisher's full texthttp://www.tandfonline.com/doi/full/10.1080/11035897.2016.1146328

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CiteExportLink to record
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