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Journal of the Geological Society; 2005; v. 162; issue.5; p. 741-744;
DOI: 10.1144/0016-764904-160
© 2005 Geological Society of London

Short Communication

New dates (415 Ma) for the Etive Dyke Swarm and the end of the Caledonian Orogeny in the SW Grampian Highlands of Scotland

G. A. MORRIS1,2, L. PAGE3 & V. MARTINEZ1

1 1 Département de Minéralogie, Université de Genève, Rue des Maraîchers 13, CH-1211 Genève, Switzerland (e-mail: george.morris@terre.unige.ch)
2 2Present address: Dept. of Geology & Geochemistry, Stockholm University, SE-106 91 Stockholm, Sweden
3 3Department of Lithosphere and Biosphere Science, Lund University, Solvegatan 12, SE-223 62 Lund, Sweden

New laser stepwise heating 40Ar–39Ar dates (415 ± 1.8 and 414 ± 2 Ma) from the Etive Dyke Swarm in the SW Grampian Highlands of Scotland indicate that the dykes are 10–20 Ma older than previously assumed. The dykes constitute the final phase of the Late Caledonian Granites in the region, which themselves define the end of the Caledonian Orogeny, therefore these dates can be taken as the end of the orogeny in this area. The dates show a temporal link between the Etive magmatism and early precious metal mineralization at Tyndrum as well as emphasizing the NW to SE diachronous nature of the end of Caledonian magmatism across Scotland.


Keywords: Caledonian Orogeny, Etive Dyke Swarm, Grampian Highlands, absolute age.




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