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Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland

Walker, S.; Thirlwall, M. F.; Strachan, R. A.; Bird, A. F.

Authors

S. Walker

M. F. Thirlwall

R. A. Strachan



Abstract

Shetland occupies a unique central location within the North Atlantic Caledonides. Thirty-three new high-precision Rb–Sr mineral ages indicate a polyorogenic history. Ages of 723–702 Ma obtained from the vicinity of the Wester Keolka Shear Zone indicate a Neoproterozoic (Knoydartian) age and preclude its correlation with the Silurian Moine Thrust. Ordovician ages of c. 480–443 Ma obtained from the Yell Sound Group and the East Mainland Succession constrain deformation fabrics and metamorphic assemblages to have formed during Grampian accretionary orogenic events, broadly contemporaneously with orogenesis of the Dalradian Supergroup in Ireland and mainland Scotland. The relative paucity of Silurian ages is attributed to a likely location at a high structural level in the Scandian nappe pile relative to mainland Scotland. Ages of c. 416 and c. 411 Ma for the Uyea Shear Zone suggest a late orogenic evolution that has more in common with East Greenland and Norway than with northern mainland Scotland.

Citation

Walker, S., Thirlwall, M. F., Strachan, R. A., & Bird, A. F. (2016). Evidence from Rb–Sr mineral ages for multiple orogenic events in the Caledonides of Shetland, Scotland. Journal of the Geological Society, 173(3), 489-503. https://doi.org/10.1144/jgs2015-034

Journal Article Type Article
Acceptance Date Sep 9, 2015
Online Publication Date Dec 23, 2015
Publication Date 2016-05
Deposit Date Mar 23, 2016
Publicly Available Date Mar 28, 2024
Journal Journal of the Geological Society
Print ISSN 0016-7649
Electronic ISSN 2041-479X
Publisher Geological Society
Peer Reviewed Peer Reviewed
Volume 173
Issue 3
Pages 489-503
DOI https://doi.org/10.1144/jgs2015-034
Keywords Geology
Public URL https://hull-repository.worktribe.com/output/434028
Publisher URL http://jgs.lyellcollection.org/content/early/2015/12/09/jgs2015-034.abstract?sid=f0dc4e70-6b21-4751-ad12-fbffa895d05b
Additional Information Copy of article first published in: Journal of the Geological Society, 2016, v.173.

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