Articles | Volume 16, issue 2
https://doi.org/10.5194/se-16-97-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-97-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
11 Feb 2025
Research article |
| 11 Feb 2025
| 11 Feb 2025
Insights into the tectonic evolution of the Svecofennian orogeny based on in situ Lu–Hf dating of garnet and apatite from Olkiluoto, southwestern Finland
Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland
Department of Geology and Mineralogy, Åbo Akademi University, Akatemiakatu 1, 20500 Turku, Finland
Kathryn Cutts
Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland
Stijn Glorie
Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia
Esa Heilimo
Department of Geography and Geology, University of Turku, Akatemiakatu 1, 20500 Turku, Finland
Ester M. Jolis
Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland
Radoslaw M. Michallik
Geological Survey of Finland, P.O. Box 96, 02151 Espoo, Finland
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In this contribution we demonstrate in situ monazite Lu–Hf dating and compare results with U–Th–Pb dating. We present data from monazite reference materials and complex samples to demonstrate the viability of this method. We show that in situ Lu–Hf dating of monazite can resolve multiple age populations and may find use where the U–Th–Pb system is compromised by Pb-loss, non-radiogenic Pb contamination, excess 206 Pb, low U contents, or a combination of these factors.
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Short summary
This paper describes migmatites and associated rocks in SW Finland that have been studied using the new in situ garnet and apatite Lu–Hf geochronology method. The metamorphic constraints and age presented in this paper enhance our understanding of the geological evolution in SW Finland. The results reveal detailed temporal constraints for the tectonic evolution that can be linked to major events in adjacent tectonic blocks in both Finland and Sweden during the Svecofennian orogeny.
This paper describes migmatites and associated rocks in SW Finland that have been studied using...
