Chronologie et contexte tectonique des roches volcaniques ordoviciennes du terrane de Miramichi dans l'est du Maine, États-Unis, et le sud-ouest du Nouveau-Brunswick, Canada
DOI :
https://doi.org/10.4138/atlgeo.2025.003Résumé
De nouvelles datations U-Pb par LA-ICP-MS et des données géochimiques provenant de roches volcaniques de la partie sud-ouest du terrane de Miramichi dans le Maine, aux États-Unis, et dans le secteur de la rivière Eel, au Nouveau-Brunswick, Canada, révèlent que le volcanisme d'arc continental calcoalcalin a commencé au tout début de l'Ordovicien (il y a environ 480 Ma) et s'est poursuivi jusqu'à l'Ordovicien moyen (au moins jusqu'à environ 463 Ma). Le chevauchement des âges des roches volcaniques des segments de Greenfield (environ 478 à 463 Ma) et Danforth, Maine, (environ 467 à 475 Ma) et de la rivière Eel, Nouveau-Brunswick, (environ 480 à 468 Ma) du terrane confirme des corrélations auparavant incertaines entre les formations d'Olamon Stream (Greenfield), de Stetson Mountain (Danforth), de Porten Road et d’Eel River dans ces secteurs. Les âges les plus récents de l'Ordovicien moyen chevauchent ceux des unités les plus anciennes du Groupe de Tetagouche dans le nord du Nouveau-Brunswick, attribuées à une extension crustale ayant conduit à l'ouverture du bassin arrière-arc de Tetagouche.
Les roches siliceuses et mafiques du Groupe de Tetagouche se situent sur les schémas de discrimination tectonique dans des champs intraplaques nettement différents des champs d'arc volcanique des roches siliceuses et mafiques contemporaines des deux segments du Maine et du segment de la rivière Eel au Nouveau-Brunswick. Le volcanisme d'arc continental dans le terrane sud-ouest de Miramichi ne s'est pas interrompu au début de l’extension / du rifting de l'arc ayant abouti à la formation du bassin arrière-arc de Tetagouche, vers 470 Ma, au Nouveau-Brunswick, comme l’avançait un modèle précédent invoquant un arc migratoire unique. Le volcanisme dans le sud-ouest de Miramichi s'est plutôt prolongé d'au moins 480 à 463 Ma, ce qui est incompatible avec le volcanisme d’arc de la phase de courte durée de Meductic (environ 476 à 472 Ma) avancé dans ce modèle.
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© Allan Ludman, Amber Whittaker, Paul O'Sullivan, Christopher McFarlane 2025

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