Late Svecofennian mafic magmatism in southern Finland
: Markku Väisänen, Charlotta Simelius, Hugh O’Brien, Mira Kyllästinen, Jussi Mattila
: Olav Eklund, Ilmo Kukkonen, Pietari Skyttä, Pia Sonck-Koota, Markku Väisänen, David Whipp
: Lithosphere 2014
: Institute of Seismology, University of Helsinki, Finland
: 2014
: PROGRAMME AND EXTENDED ABSTRACTS
: INSTITUTE OF SEISMOLOGY, UNIVERSITY OF HELSINKI, REPORT S
: S-62
: 107
: 110
: 4
: 978-952-10-5081-7
: 978-952-10-9282-5
: http://www.seismo.helsinki.fi/pdf/LITO2014.pdf
We present U-Pb single-grain laser-ablation zircon data from gabbroic rocks in three locations in southern Finland. In Ruissalo, Turku, the mafic intrusions are found within the Airisto shear zone with ages of c. 1.83-1.82 Ga. In Muurla, the c. 1.81 Ga granite cuts across the c. 1.83-1.82 Ga gabbro. In Salittu, Karjalohja, the 1.83-1.82 Ga mafic dyke crosscuts the picrite. These findings indicate heat transfer from the mantle to the crust during the lateorogenic stage.
