O2 Muu julkaisu
Metamorphic zones in SW Finland: monazite and zircon U-Pb dating of leucosomes in paragneisses
Tekijät: Vehkamäki T, Väisänen M, Kurhila M, O’Brien H, Hölttä P, Syrjänen JK
Toimittaja: Ilmo Kukkonen, Toni Veikkolainen, Suvi Heinonen, Fredrik Karell, ElenaKozlovskaya, Arto Luttinen, KaisaNikkilä, Vesa Nykänen, Markku Poutanen,PietariSkyttä, Eija Tanskanen, Timo Tiira
Konferenssin vakiintunut nimi: LITHOSPHERE
Kustantaja: University of Helsinki
Kustannuspaikka: Helsinki
Julkaisuvuosi: 2021
Kokoomateoksen nimi: LITHOSPHERE 2021: ELEVENTH SYMPOSIUM ON STRUCTURE, COMPOSITION AND EVOLUTION OF THE LITHOSPHERE: PROGRAMME AND EXTENDED ABSTRACTS
Sarjan nimi: Report / Institute of Seismology, University of Helsinki
Numero sarjassa: S-71
Aloitussivu: 139
Lopetussivu: 142
ISBN: 978-952-10-9604-4
ISSN: 0357-3060
Verkko-osoite: https://www.seismo.helsinki.fi/ilp/lito2021/Lithosphere_2021_Symposium_Abstract_Volume.pdf
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/51863298
The Central Svecofennian Arc Complex (CSAC) and the Southern Svecofennian Arc Complex (SSAC) show
different ages of peak metamorphism: ~1.88 Ga in the CSAC and ~1.83 Ga in the SSAC. In the present project we study the age of the metamorphism in SW Finland. We have collected two samples. Of these the Eurajoki leucosome zircons were > 1.92 Ga, i.e.,inherited, but monazites show two populations: ~1.83 Ga and ~1.7 Ga. The zircons from the Rauma leucosome yielded two populations: ~1.86 Ga and ~1.83 Ga. The monazites show ages of ~1.83 Ga and ~1.7 Ga. We interpret that the ~1.86 Ga zircons represent the older metamorphism and the 1.83 Ga zircon and monazite group to represent the younger metamorphism. The 1.7 Ga group is unusual and needs further investigation.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
