Other publication
U-Pb zircon, monazite and xenotime geochronology of cordierite-anthophyllite and felsic volcanic rocks in Orijärvi, southern Finland
Authors: Teemu Vehkamäki, Markku Väisänen, Yann Lahaye, Matti Kurhila, Bo Johanson
Editors: Ilmo Kukkonen, Suvi Heinonen, Hanna Silvennoinen, Fredrik Karell, Elena Kozlovskaya, Arto Luttinen, Kaisa
Nikkilä, Vesa Nykänen, Markku Poutanen, Pietari Skyttä, Eija Tanskanen, Timo Tiira, Kati Oinonen
Conference name: SYMPOSIUM ON STRUCTURE, COMPOSITION AND EVOLUTION OF THE LITHOSPHERE
Publisher: Institute of Seismology, University of Helsinki
Publishing place: Helsinki
Publication year: 2018
Book title : LITHOSPHERE 2018
Series title: Report S
Number in series: 67
First page : 117
Last page: 120
ISBN: 978-952-10-9594-8
eISBN: 978-952-10-9595-5
Web address : http://www.seismo.helsinki.fi/ilp/lito2018/Lito2018_Abstract_Volume_color.pdf
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/36385498
We sampled one felsic volcanic rock from the lower part of the Kisko formation and two cordierite-anthophyllite rocks from Orijärvi and Iilijärvi for U-Pb dating. The felsic volcanic rock yield a zircon 207Pb/206Pb weighted average age of ~1.89 Ga. The oldest zircons from the Orijärvi cordierite-anthophyllite rock give a weighted average age of ~1.89 Ga. The monazite from the same sample yield a concordia age of ~1.80 Ga and the xenotime yield a concordia age of ~1.82 Ga. The Iilijärvi cordierite-anthophyllite rock gives a monazite concordia age of ~1.82 Ga. This implies that two metamorphic pulses are recorded in the samples.
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