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Archean mantle fragments in Proterozoic crust, Western Gneiss Region, Norway

¹ Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
² Queens College and the Graduate Center of the City University of New York, Flushing, New York 11367, USA, and Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA, and Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
³ Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia, and Commonwealth Scientific and Industrial Research Organisation Exploration and Mining, North Ryde, NSW 2113, Australia
⁴ Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia
⁵ Australian Research Council National Key Centre for Geochemical Evolution and Metallogeny of Continents, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia

Small volumes of garnet peridotite occur within large dunite bodies in the Western Gneiss Region of the Norwegian Caledonides. Previous Sm-Nd analyses of garnet peridotite yield Proterozoic ages close to the crystallization ages of the host gneisses. In situ (laser-ablation multicollector–inductively coupled plasma–mass spectrometry) Re-Os analysis of sulfides in the garnet peridotites gives a range of Proterozoic and Archean model ages. An Archean (2.7–3.1 Ga) protolith age is supported by whole-rock Re-Os data for sulfide-free dunites from several bodies. The Archean ages imply a melt-extraction event in the lithospheric mantle that predates the growth of the known Proterozoic upper crust in the region.

Key Words: Norwegian Caledonides • mantle peridotites • sulfide ages • Re-Os ages • Archean lithospheric mantle

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