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U–Pb baddeleyite ages and Hf, Nd isotope chemistry constraining repeated mafic magmatism in the Fennoscandian Shield from 1.6 to 0.9 Ga

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Abstract

The Palaeoproterozoic (1.90–1.60 Ga) crust of central Fennoscandia was intruded repeatedly by dolerite dikes and sills during the Neo- and Mesoproterozoic eons. We report 17 new baddeleyite U–Pb dates comprising six generations of dolerites (in Ma):

Blekinge-Dalarna dolerites

946–978

Protogine Zone dolerites

1,215–1,221

Central Scandinavian Dolerite Group

1,264–1,271

Tuna dikes and age equivalents in Dalarna

1,461–1,462

Värmland dolerites

∼1,568

Breven-Hällefors dolerites

∼1,595

The favoured tectonic model implies that the majority of these suites were related to active margin processes somewhere west (and possibly south) of the Fennoscandian Shield. Dolerite intrusions are interpreted to reflect discrete events of back-arc extension as the arc retreated oceanward. Initial Hf and Nd isotope compositions of the dolerite swarms fall between CHUR and normal-depleted mantle, and suggest a variably depleted and re-enriched mantle as the source for the here investigated 1.6 to 0.95 Ga old mafic rocks. Repeated recycling of older crustal components, mainly sediments (dominated by material with short residence ages) in earlier subduction systems may have been very efficient at producing geochemically and isotopically variably enriched lithospheric mantle sections beneath the Fennoscandian Shield.

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Acknowledgements

Isotopic research at Arizona was supported by NSF-EAR-0003343. This research was also sponsored by the Swedish Foundation for International Cooperation in Research and Higher Education (STINT) as a personal fellowship program to Ulf Söderlund. Samples of the Särna dike and the Västergötland dolerites were provided from Claes Mellqvist (Geological Survey of Sweden, Uppsala) and Fredrik Hellström (Göteborg). Audrius Ĉeĉys gave valuable comments on an early draft of this manuscript. Fernando Corfu and an anonymous referee are thanked for constructive reviews on the manuscript.

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  1. Ulf Söderlund

    Present address: Department of Geology, GeoBiosphere Science Centre, Lund University, Sölvegatan 12, 223 62, Lund, Sweden

Authors and Affiliations

  1. Department of Geosciences, University of Arizona, Tucson, AZ, 85721, USA

    Ulf Söderlund, Clark E. Isachsen & P. Jonathan Patchett

  2. Department of Geology, GeoBiosphere Science Centre, Lund University, Sölvegatan 12, 223 62, Lund, Sweden

    Göran Bylund

  3. Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alta, Canada, T6G 2E

    Larry M. Heaman

  4. Department of Geology, Washington State University, Pullman, OR, 99164, USA

    Jeff D. Vervoort

  5. Laboratory for Isotope Geology, Swedish Museum of Natural History, Box 50007, 104 05, Stockholm, Sweden

    Ulf B. Andersson

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

    Ulf B. Andersson

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Söderlund, U., Isachsen, C.E., Bylund, G. et al. U–Pb baddeleyite ages and Hf, Nd isotope chemistry constraining repeated mafic magmatism in the Fennoscandian Shield from 1.6 to 0.9 Ga. Contrib Mineral Petrol 150, 174–194 (2005). https://doi.org/10.1007/s00410-005-0011-1

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