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

Eloise E. Beyer; Hannes K. Brueckner; William L. Griffin; Suzanne Y. O'Reilly; Stuart Graham

doi:10.1130/G20366.1

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

Eloise E. Beyer^*, Hannes K. Brueckner, William L. Griffin, Suzanne Y. O'Reilly, Stuart Graham

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

48 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	609-612
Number of pages	4
Journal	Geology
Volume	32
Issue number	7
DOIs	https://doi.org/10.1130/G20366.1
Publication status	Published - Jul 2004

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abstract = "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.",

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AU - Beyer, Eloise E.

AU - Brueckner, Hannes K.

AU - Griffin, William L.

AU - O'Reilly, Suzanne Y.

AU - Graham, Stuart

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AB - 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.

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

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