Laurentian origin of the Ordovician Grangegeeth volcanic arc terrane, Ireland

McConnell, Brian; Crowley, Quentin G.; Riggs, Nancy. 2010 Laurentian origin of the Ordovician Grangegeeth volcanic arc terrane, Ireland. Journal of the Geological Society, 167 (3). 469-474.

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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 peri-Laurentian provenance. These findings suggest that the Grangegeeth volcanic terrane does not represent a continuation of the intra-Iapetus Exploits arc of Newfoundland.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BGS Programmes 2010 > NERC Isotope Geoscience Laboratory
ISSN: 0016-7649
Additional Information. Not used in RCUK Gateway to Research.: Supplementary material: Full analytical protocols, applied data corrections, processing and plotting rationales and data table for zircon LA-MC-ICP-MS analysis are available at
Date made live: 30 Apr 2010 12:40 +0 (UTC)

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