The age of the Oughterard Granite, Connemara, Ireland

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Authors:Kennan, P. S.; Feely, M.; Mohr, P.
Author Affiliations:Primary:
Univ. Coll. Dublin, Dep. Geol., Dublin, Ireland
Univ. Coll. Galway, Ireland
Volume Title:Geological Journal
Source:Geological Journal, 22(4), p.273-280. Publisher: Wiley & Sons, Chichester-New York, United Kingdom. ISSN: 0072-1050
Publication Date:1987
Note:In English. 17 refs.; illus. incl. 1 table, geol. sketch maps
Summary:New Rb-Sr whole-rock isotopic analyses are presented for the E and W granite outcrops. The preferred age for the E granite is 407 + or - 23 m.y. (initial ratio 0.7076 + or - 1), and the index of goodness of fit (MSWD) is 2.5. A relatively young Caledonian age for the Oughterard granite is indicated and the initial ratio lies within the range for other Irish Caledonian granites. Samples from the xenolithic and sheared W granite gave an 'age' of 422 + or - 51 m.y. (initial ratio 0.7090 + or - 3, MSWD 3.6); this initial ratio is significantly higher than that for the E granite. Anomalies in the data are discussed. [R.K.H.]
Subjects:Absolute age; Caledonian Orogeny; Dates; Granites; Igneous rocks; Paleozoic; Petrology; Plutonic rocks; Connemara; Europe; Galway Ireland; Ireland; Western Europe; Oughterard Granite
Abstract Numbers:88M/3207
Record ID:1989049023
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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