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U–Pb geochronology of gneisses and granitoids from the Danish island of Bornholm: new evidence for 1.47–1.45 Ga magmatism at the southwestern margin of the East European Craton

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Abstract

The Danish island of Bornholm is located at the southwestern margin of the Fennoscandian Shield, and features exposed Precambrian basement in its northern and central parts. In this paper, we present new U–Pb zircon and titanite ages for granites and orthogneisses from 13 different localities on Bornholm. The crystallization ages of the protolith rocks all fall within the range 1,475–1,445 Ma (weighted average 207Pb/206Pb ages of zircon). Minor age differences, however, may imply a multi-phase emplacement history of the granitoid complex. The presence of occasional inherited zircons (with ages of 1,700–1,800 Ma) indicates that the Bornholm granitoids were influenced by older crustal material. The east–west fabric observed in most of the studied granites and gneisses, presumably originated by deformation in close connection with the magmatism at 1,470–1,450 Ma. Most titanite U–Pb ages fall between 1,450 and 1,430 Ma, reflecting post-magmatic or post-metamorphic cooling. Granitoid magmatism at ca. 1.45 Ga along the southwestern margin of the East European Craton has previously been reported from southern Sweden and Lithuania. The ages obtained in this study indicate that the Bornholm magmatism also was part of this Mesoproterozoic event.

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Acknowledgments

Samples 95041–95045 were obtained from Stefan Claesson (Stockholm); the other samples were collected in cooperation with Svetlana Bogdanova and Audrius Cecys (Lund) and Andrius Rimsa (Stockholm). Paula Allart carried out the mineral separation work at the Swedish Museum of Natural History in Stockholm, and Per-Olof Persson gave advice on U–Pb preparation of titanite. The NORDSIM ion microprobe analyses were carried out with the help of Martin Whitehouse, Lev Ilyinsky and Kerstin Lindén of the NORDSIM laboratory. The NORDSIM ion microprobe laboratory is financed under contract with the Nordic Natural Science Research Councils and the Swedish Museum of Natural History. This is NORDSIM publication no. 210. Funding for the Bornholm project was received from the Swedish Research Council (VR), grant 621-2003-3564, to ÅJ, with additional funding for KZ:s salary from Uppsala University and for her field work on Bornholm from “Riksmusei vänner”. We especially want to acknowledge the cooperation and support of Hemin Koyi (Uppsala) and Svetlana Bogdanova (Lund), who also gave valuable comments on earlier versions of the manuscript. Karin Högdahl (Lund) carefully examined the licentiate thesis of KZ, in which an early version of this paper formed an important part. Svetlana Bogdanova (Lund) and Jenny Andersson (Uppsala) reviewed the final manuscript.

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  1. Department of Earth Sciences, Uppsala University, Villavägen 16, 752 36, Uppsala, Sweden

    Kristina Zariņš

  2. Laboratory for Isotope Geology, Swedish Museum of Natural History, Box 50 007, 104 05, Stockholm, Sweden

    Kristina Zariņš & Åke Johansson

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  1. Kristina Zariņš
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Correspondence to Åke Johansson.

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Zariņš, K., Johansson, Å. U–Pb geochronology of gneisses and granitoids from the Danish island of Bornholm: new evidence for 1.47–1.45 Ga magmatism at the southwestern margin of the East European Craton. Int J Earth Sci (Geol Rundsch) 98, 1561–1580 (2009). https://doi.org/10.1007/s00531-008-0333-0

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