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The age of the Oughterard Granite, Connemara, Ireland

✍ Scribed by P. S. Kennan; M. Feely; P. Mohr

Publisher: John Wiley and Sons
Year: 1987
Tongue: English
Weight: 483 KB
Volume: 22
Category: Article
ISSN: 0072-1050
DOI: 10.1002/gj.3350220402

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✦ Synopsis

Despite a wide latitude for interpretation of previous Rb-Sr isotopic data on thc Oughterard Granite the age of this intrusion has been regarded as a critical time-marker in resolving the Caledonian evolution of Connemara. New isotopic data suggest that the age of the intrusion be revised from c. 460 Ma to c. 400 Ma, thus making the Oughterard Granite one among the many Newer Caledonian Granites in Ireland. The preferred age is 407 2 23 Ma, and the initial " S r P S r ratio is 0.7076 2 1. Heterogeneity within the granite is demonstrated, which explains the difficulty in obtaining reliable isotopic ages from this intrusion.

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