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The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate

Kinny, P.D.; Strachan, R.A.; Fowler, M.; Clark, C.; Davis, S.; Jahn, I.; Taylor, R.J.M.; Holdsworth, R.E.; Dempsey, E.

The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate Thumbnail


Authors

P.D. Kinny

R.A. Strachan

M. Fowler

C. Clark

S. Davis

I. Jahn

R.J.M. Taylor

E. Dempsey



Abstract

A tract of amphibolite facies granitic gneisses and metagabbros in northern Shetland, U.K., is here named the Uyea Gneiss Complex. Zircon U–Pb dating indicates emplacement of the igneous protoliths of the complex c. 2746–2726 Ma, at a later time than most of the Archaean protoliths of the Lewisian Gneiss Complex of mainland Scotland. Calc-alkaline geochemistry of the Uyea Gneiss Complex indicates arc-affinity and a strong genetic kinship among the mafic and felsic components. Zircon Hf compositions suggest an enriched mantle source and limited interaction with older crust during emplacement. Ductile fabrics developed soon after emplacement, with zircon rims at c. 2710 Ma, but there was little further deformation until Caledonian reworking east of the Uyea Shear Zone. There is no evidence for the Palaeoproterozoic reworking that dominates large tracts of the Lewisian Gneiss Complex and of the Nagssugtoqidian Orogen of East Greenland. The more northerly location of the Uyea Gneiss Complex and extensive offshore basement of similar age implies that, prior to the opening of the North Atlantic Ocean, these rocks were contiguous with the Archaean Rae Craton.

Citation

Kinny, P., Strachan, R., Fowler, M., Clark, C., Davis, S., Jahn, I., …Dempsey, E. (2019). The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate. Journal of the Geological Society, 176(5), 847-862. https://doi.org/10.1144/jgs2019-017

Journal Article Type Article
Acceptance Date May 14, 2019
Online Publication Date Jun 21, 2019
Publication Date Sep 1, 2019
Deposit Date May 20, 2019
Publicly Available Date Mar 29, 2024
Journal Journal of the Geological Society
Print ISSN 0016-7649
Publisher The Geological Society
Peer Reviewed Peer Reviewed
Volume 176
Issue 5
Pages 847-862
DOI https://doi.org/10.1144/jgs2019-017

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Copyright Statement
Kinny, P.D., Strachan, R.A., Fowler, M., Clark, C., Davis, S., Jahn, I., Taylor, R.J.M., Holdsworth, R.E. & Dempsey, E. (2019). The Neoarchaean Uyea Gneiss Complex, Shetland: an onshore fragment of the Rae Craton on the European Plate. Journal of the Geological Society. https://doi.org/10.1144/jgs2019-017 © Geological Society of London 2019.




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