Age, geochemistry, and origin of the mid-Proterozoic Häme mafic dyke swarm, southern Finland

• Published in: Bulletin of the Geological Society of Finland
• Main Authors: Luttinen, Arto, Lehtonen, Elina, Bohm, Katja, Lindholm, Tanja, Söderlund, Ulf, Salminen, Johanna
• Format: Article in Journal/Newspaper
• Language: English
• Published: Geological Society of Finland 2022
• Subjects: Geology; Fennoscandia; geochronology; ID-TIMS; mafic dyke; mid-Proterozoic; rapakivi magmatism; Häme
• Online Access: https://lup.lub.lu.se/record/ec05c41a-179f-4ca1-98e2-be2044ff350c; https://doi.org/10.17741/bgsf/94.1.004

We have reappraised the age and composition of the mid-Proterozoic Häme dyke swarm in southern Finland. The dominant trend of the dykes of this swarm is NW to WNW. Petrographic observations and geochemical data indicate uniform, tholeiitic low-Mg parental magmas for all of the dykes. Nevertheless, t...