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A revised age for the Donegal granites

✍ Scribed by Halliday, A. N.; Aftalion, M.; Leake, B. E.


Book ID
109718255
Publisher
Nature Publishing Group
Year
1980
Tongue
English
Weight
232 KB
Volume
284
Category
Article
ISSN
0028-0836

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## Abstract Seven phases of deformation are recognised in Dalradian metasediments within the NW aureole of the Main Donegal Granite. Major NW facing F2 folds (the Aghla Anticline and Errigal Syncline) refold an originally NW facing slaty cleavage, which is usually parallel to bedding. D3 structures

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## Abstract A recent interpretation of the structural geology and chronology of the northwestern envelope of the Main Donegal Granite by Hutton (1977) is critically examined. Although many aspects of this analysis are sound, there remains serious doubt concerning Hutton's main conclusion that the

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## Abstract A Rb‐Sr whole‐rock isochron study indicates that the entire Donegal granite suite was emplaced into orthotectonic Caledonian (Dalradian) rocks over a short interval during mid‐Silurian to earliest‐Devonian times. The Thorr pluton, probably the earliest member of the suite, yields an age

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I thank Dr. Berger for his comments on an earlier paper of mine (Hutton 1977) and welcome this opportunity to clarify and expand on various aspects of that work. Berger (1980) has divided the Creeslough Formation in its type area into a lower 'calcareous' unit (occurring in the SE) and an upper pel