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

Research output: Contribution to journalArticle

Abstract

New laser stepwise heating Ar-40-Ar-39 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.

Details

Authors
  • GA Morris
  • Laurence Page
  • V Martinez
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Geology

Keywords

  • Caledonian Orogeny, Etive Dyke Swann, Grampian Highlands, absolute age
Original languageEnglish
Pages (from-to)741-744
JournalJournal of the Geological Society
Volume162
Issue number5
Publication statusPublished - 2005
Publication categoryResearch
Peer-reviewedYes