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Fission track dates from two Galloway granites, Scotland

Published online by Cambridge University Press:  01 May 2009

A. J. Hurford
A. J. Hurford
Affiliation:
Department of Geology, Birkbeck College, University of London, 7–15, Gresse Street, London W1P 1PA
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Summary

Previous radiometric age determinations for the Criffell–Dalbeattie and Cairnsmore of Fleet Newer Granite intrusions are briefly reviewed. Thirteen fission-track dating results are presented for the co-existing accessory minerals sphene, zircon and apatite separated from the two granites. The mean sphene apparent age of 401±10 Ma and single zircon apparent age of 389±26 Ma are interpreted as the age of initial post-intrusion cooling of the granites. Results from apatite are discordant with those of sphene and zircon. Four determinations give a mean Upper Cretaceous apparent age of ∼ 80 Ma which is not readily interpreted. A single apatite determination upon a sample located adjacent to a basaltic dyke yielded a Tertiary age.

Type
Articles
Information
Geological Magazine , Volume 114 , Issue 4 , July 1977 , pp. 299 - 304
Copyright
Copyright © Cambridge University Press 1977

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