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Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden

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Abstract

The Jönköping Anorthositic Suite (JAS) in S. Sweden has characteristics typical for (Proterozoic) massif-type anorthosites. The interstitial liquid of these plagioclase-porphyritic rocks solidified at 1,455 ± 6 Ma, as determined by U–Pb isotope analysis of baddeleyite. The JAS developed during a regional 1.47–1.44 event in Fennoscandia that generated widespread mafic magmatism (basalts, and diabase dykes and sills) in the north and emplacement of felsic plutons in the south. The event of 1.47–1.44 Ga magmatism in Fennoscandia largely coincides in age with dynamic high-grade metamorphism in SW Sweden and was probably related to convergent active-margin processes during the Danopolonian orogeny.

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Acknowledgments

We thank Jimmy Stigh and David Cornell for valuable comments on an early version of this manuscript, and Sven Åke Larson for introducing LB to the field area. Lena Lundqvist is thanked for discussions on various aspects of the JAS and ADS. Karin Appelquist assisted in the field and Johan Hogmalm with chemical analysis. Sarah Mell introduced LB to Mapinfo. This research was sponsored by grants from the Wilhelm and Martina Lundgrens Vetenskapsfond, Stiftelsen Lars Hiertas Minne, the Swedish Research Council (to US), and via a grant (60–1159/2002) from the Geological Survey of Sweden to Sven Åke Larson. This paper was significantly improved by journal reviews of Fernando Corfu and Lew Ashwal.

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Brander, L., Söderlund, U. Mesoproterozoic (1.47–1.44 Ga) orogenic magmatism in Fennoscandia; Baddeleyite U–Pb dating of a suite of massif-type anorthosite in S. Sweden. Int J Earth Sci (Geol Rundsch) 98, 499–516 (2009). https://doi.org/10.1007/s00531-007-0281-0

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