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Intra-orogenic Svecofennian magmatism in SW Finland constrained by LA-MC-ICP-MS zircon dating and geochemistry
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2012 (English)In: GFF, ISSN 1103-5897, Vol. 134, no 2, 99-114 p.Article in journal (Refereed) Published
Abstract [en]

We have studied plutonic rocks from the Korpo and Rauma areas of south-western Finland which can be categorized as intra-orogenic, i.e. they were intruded during a proposed extensional period between the two main Svecofennian orogenic cycles: the Fennian and Svecobaltic orogenies. The diorite from Rauma yielded an age of 1865 +/- 9 Ma and the diorite from Korpo an age of 1852 +/- 4 Ma. The adjacent garnet-bearing Korpo granite was 1849 +/- 8 Ma in age. Zircons from the granite also included inherited Archaean and older Palaeoproterozic zircons, as well as metamorphic c. 1820 Ma rims. The diorites are high-K to shoshonitic, mantle-derived magmas, rich in Fe, P, F and light rare earth elements. The Korpo granites show typical features of crustal-derived melts and form hybrids with the diorites in contact zones. Both the mantle-derived and crustal-derived intra-orogenic magmatism are considered to have had a causal effect on the subsequent late Svecofennian (Svecobaltic) thermal evolution in southern Finland which culminated in granulite facies metamorphism and large-scale crustal melting.

Place, publisher, year, edition, pages
2012. Vol. 134, no 2, 99-114 p.
Keyword [en]
Svecofennian, intra-orogenic, heat source, crustal melting, laser-ablation, zircon
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-179889DOI: 10.1080/11035897.2012.680606ISI: 000306600000003OAI: oai:DiVA.org:uu-179889DiVA: diva2:547046
Available from: 2012-08-27 Created: 2012-08-27 Last updated: 2012-08-27Bibliographically approved

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Högdahl, Karin
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