2012
DOI: 10.1130/b30619.1
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Episodic arc-ophiolite emplacement and the growth of continental margins: Late accretion in the Northern Irish sector of the Grampian-Taconic orogeny

Abstract: In order to understand the progressive growth of continental margins and the evolution of continental crust, we must fi rst understand the formation of allochthonous ophiolitic and island-arc terranes within ancient orogens and the nature of their accretion. During the early Paleozoic closure of the Iapetus Ocean, diverse sets of arc terranes, oceanic tracts, and ribbon-shaped micro conti nental blocks were accreted to the passive continental margin of Laurentia during the Grampian-Taconic orogeny. In the nort… Show more

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Cited by 42 publications
(48 citation statements)
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“…The TVG lavas show evidence of contamination by continental material (Draut et al 2009;Cooper et al 2011) and are thought to have been erupted in a peri-Laurentian island-arc to back-arc environment, which underwent several episodes of intra-arc rifting (Hollis et al 2012). Accretion to the outboard peri-Laurentian microcontinental block now represented by the Tyrone Central Inlier followed soon after obduction of the TPG, and was also complete by about 470 Ma.…”
Section: The Tyrone Igneous Complexmentioning
confidence: 99%
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“…The TVG lavas show evidence of contamination by continental material (Draut et al 2009;Cooper et al 2011) and are thought to have been erupted in a peri-Laurentian island-arc to back-arc environment, which underwent several episodes of intra-arc rifting (Hollis et al 2012). Accretion to the outboard peri-Laurentian microcontinental block now represented by the Tyrone Central Inlier followed soon after obduction of the TPG, and was also complete by about 470 Ma.…”
Section: The Tyrone Igneous Complexmentioning
confidence: 99%
“…All are interbedded with calc-alkaline, arc-derived volcaniclastic rocks that display strongly negative ƐNdt values. Lavas of island arc affinity are strongly calc-alkaline in the south-east of the TIC, but are dominantly tholeiitic and primitive in the north-east, where they are related to back-arc volcanism (Hollis et al 2012). Lavas of within-plate affinity occur at several stratigraphical levels within the TVG and show Fe-Ti-P enrichment.…”
Section: The Tyrone Igneous Complexmentioning
confidence: 99%
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