Journal
JOURNAL OF THE GEOLOGICAL SOCIETY
Volume 167, Issue 3, Pages 469-474Publisher
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/0016-76492009-139
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- NERC [nigl010001] Funding Source: UKRI
- Natural Environment Research Council [nigl010001] Funding Source: researchfish
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U-Pb ages determined by laser-ablation multi-collector inductively coupled plasma mass spectrometry on 199 zircons from a lithic pumice tuff are the first isotopic ages from the Grangegeeth volcanic terrane of Ireland. The youngest zircon population (n = 24) yields an age of 465.4 +2.4/-3.1 Ma. Inherited zircons yield ages of c. 1120-1520, c. 1650-1914 and c. 2540-2890 Ma. The absence of zircons between c. 550 and 700 Ma argues against involvement of Avalonia as a source of inherited crystals. Overall, the inherited age spectra are characteristic of Laurentian crust or metasedimentary successions of pert-Laurentian provenance. These findings suggest that the Grangegeeth volcanic terrane does not represent a continuation of the intra-lapetus Exploits arc of Newfoundland.
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