Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland?
The Tyrone Plutonic Group of Northern Ireland represents the upper portions of a tectonically dissected suprasubduction-zone ophiolite accreted to the composite Laurentian margin during the Middle Ordovician. Understanding its development and relationship to the Tyrone Central Inlier, an outboard fr...
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Geological Society of London
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ftnerc:oai:nora.nerc.ac.uk:503940 2023-05-15T17:21:34+02:00 Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? Hollis, S.P. Cooper, M.R. Roberts, S. Earls, G. Herrington, R. Condon, D.J. Daly, J. S. 2013 text http://nora.nerc.ac.uk/id/eprint/503940/ https://nora.nerc.ac.uk/id/eprint/503940/1/Hollis_et_al_JGeolSocLondon_TPG.pdf https://doi.org/10.1144/jgs2012-103 en eng Geological Society of London https://nora.nerc.ac.uk/id/eprint/503940/1/Hollis_et_al_JGeolSocLondon_TPG.pdf Hollis, S.P.; Cooper, M.R.; Roberts, S.; Earls, G.; Herrington, R.; Condon, D.J.; Daly, J. S. 2013 Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? Journal of the Geological Society, 170 (6). 861-876. https://doi.org/10.1144/jgs2012-103 <https://doi.org/10.1144/jgs2012-103> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1144/jgs2012-103 2023-02-04T19:38:06Z The Tyrone Plutonic Group of Northern Ireland represents the upper portions of a tectonically dissected suprasubduction-zone ophiolite accreted to the composite Laurentian margin during the Middle Ordovician. Understanding its development and relationship to the Tyrone Central Inlier, an outboard fragment of relatively high-grade, peri-Laurentian continental crust, is essential for reconstructing the closure of the Iapetus Ocean. The Tyrone Plutonic Group is composed of tectonized layered, isotropic and pegmatitic gabbros, sheeted dolerite dykes and rare pillow lavas. New U–Pb zircon thermal ionization mass spectrometry geochronology has yielded an age of 483.68 ± 0.81 Ma from pegmatitic gabbro. Geochemical characteristics, Nd and Sr isotope systematics, and zircon inheritance indicate that the Tyrone Plutonic Group formed above a north-dipping subduction zone, by the propagation of a spreading centre into a microcontinental block. Synkinematic, calc-alkaline tonalitic to granitic material preserved in the contact zone between the Tyrone Plutonic Group and the Tyrone Central Inlier has produced pressure estimates of 2.3–4.0 ± 0.6 kbar and temperatures of 525–610 °C. Coeval arc–ophiolite accretion at c. 470 Ma may explain how sillimanite-grade metamorphic conditions were reached locally in the underlying Tyrone Central Inlier. Strong temporal, geochemical and lithological similarities exist to the Annieopsquotch Ophiolite Belt of Newfoundland. Article in Journal/Newspaper Newfoundland Natural Environment Research Council: NERC Open Research Archive Journal of the Geological Society 170 6 861 876 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
The Tyrone Plutonic Group of Northern Ireland represents the upper portions of a tectonically dissected suprasubduction-zone ophiolite accreted to the composite Laurentian margin during the Middle Ordovician. Understanding its development and relationship to the Tyrone Central Inlier, an outboard fragment of relatively high-grade, peri-Laurentian continental crust, is essential for reconstructing the closure of the Iapetus Ocean. The Tyrone Plutonic Group is composed of tectonized layered, isotropic and pegmatitic gabbros, sheeted dolerite dykes and rare pillow lavas. New U–Pb zircon thermal ionization mass spectrometry geochronology has yielded an age of 483.68 ± 0.81 Ma from pegmatitic gabbro. Geochemical characteristics, Nd and Sr isotope systematics, and zircon inheritance indicate that the Tyrone Plutonic Group formed above a north-dipping subduction zone, by the propagation of a spreading centre into a microcontinental block. Synkinematic, calc-alkaline tonalitic to granitic material preserved in the contact zone between the Tyrone Plutonic Group and the Tyrone Central Inlier has produced pressure estimates of 2.3–4.0 ± 0.6 kbar and temperatures of 525–610 °C. Coeval arc–ophiolite accretion at c. 470 Ma may explain how sillimanite-grade metamorphic conditions were reached locally in the underlying Tyrone Central Inlier. Strong temporal, geochemical and lithological similarities exist to the Annieopsquotch Ophiolite Belt of Newfoundland. |
format |
Article in Journal/Newspaper |
author |
Hollis, S.P. Cooper, M.R. Roberts, S. Earls, G. Herrington, R. Condon, D.J. Daly, J. S. |
spellingShingle |
Hollis, S.P. Cooper, M.R. Roberts, S. Earls, G. Herrington, R. Condon, D.J. Daly, J. S. Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
author_facet |
Hollis, S.P. Cooper, M.R. Roberts, S. Earls, G. Herrington, R. Condon, D.J. Daly, J. S. |
author_sort |
Hollis, S.P. |
title |
Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
title_short |
Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
title_full |
Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
title_fullStr |
Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
title_full_unstemmed |
Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? |
title_sort |
evolution of the tyrone ophiolite, northern ireland, during the grampian-taconic orogeny: a correlative of the annieopsquotch ophiolite belt of central newfoundland? |
publisher |
Geological Society of London |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/503940/ https://nora.nerc.ac.uk/id/eprint/503940/1/Hollis_et_al_JGeolSocLondon_TPG.pdf https://doi.org/10.1144/jgs2012-103 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
https://nora.nerc.ac.uk/id/eprint/503940/1/Hollis_et_al_JGeolSocLondon_TPG.pdf Hollis, S.P.; Cooper, M.R.; Roberts, S.; Earls, G.; Herrington, R.; Condon, D.J.; Daly, J. S. 2013 Evolution of the Tyrone ophiolite, Northern Ireland, during the Grampian-Taconic orogeny: a correlative of the Annieopsquotch Ophiolite Belt of central Newfoundland? Journal of the Geological Society, 170 (6). 861-876. https://doi.org/10.1144/jgs2012-103 <https://doi.org/10.1144/jgs2012-103> |
op_doi |
https://doi.org/10.1144/jgs2012-103 |
container_title |
Journal of the Geological Society |
container_volume |
170 |
container_issue |
6 |
container_start_page |
861 |
op_container_end_page |
876 |
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1766106536861499392 |