An investigation of the geology and chemistry of the basic igneous rocks in the Elmtree and Belledune inliers in northern New Brunswick shows that the bulk of the Middle Ordovician rocks of the ophiolitic Fournier Group are best interpreted as the products of volcanism and sedimentation in an extensive ensimatic back-arc basin southeast of a volcanic arc. The oceanic back-arc-basin igneous rocks form the basement to renewed arc-related basaltic volcanism in late Middle to Late Ordovician time. The Fournier Group is separated from the structurally-underlying, shale-dominated Elmtree Formation of the Tetagouche Group by an extensive tectonic melange, which incorporates lenses of serpentinite, mafic volcanic rocks, and sedimentary rocks of both the Tetagouche and Fournier groups. The mafic volcanic rocks in the Elmtree Formation correlate best with those intercalated with the lithologically similar sediments of the Llandeilian -Caradocian Boucher Brook Formation in the northern Miramichi Highlands. The melange and the present structural amalgamation of the Tetagouche and Fournier groups result from closure of the marginal basin by northward-directed subduction at the end of the Ordovician. Most mafic suites in the Elmtree and Belledune inliers can be chemically correlated with similar suites in the northern Miramichi Highlands, showing that the two areas are not separated by a terrane boundary.Une Ctude de la gCologie et de la chimie des roches ignCes basiques dans les boutonnikres dlElmtree et de Belledune, dans le nord du Nouveau-Brunswick, rCv&le que pour la majorit6 des roches de nature ophiolitique du Groupe de Fournier, d'lge ordovicien moyen, la meilleure interprktation est celle qui les reprCsente cornme des matCriaux volcaniques et skdimentaires accumulCs dans un bassin dlarrSre-arc ensimatique au sud-est de l'arc volcanique. Les roches ignCes oceaniques du bassin d'arrikre-arc foment le substratum sur lequel reposent les effusions plus rCcentes de volcanites basaltiques reliCes 2 l'arc et datant de l'ordovicien moyen & tardif. Le Groupe de Fournier, lequel recouvre structuralement la Formation d'Elmtree du Groupe de TCtagouche formCe principalement de shale, est sCpark cette formation par un mClange tectonique ktendu, incluant des lentilles de serpentinite, des roches volcaniques mafiques et des roches saimentaires qui dCrivent des deux groupes de TCtagouche et Fournier. La meilleure corrClation des roches volcaniques mafiques de la Formation d'Elmtree est obtenue avec les roches intercalkes dans les sediments de lithologie similaire de la Formation de Boucher Brook, du Llandeilien-Caradocien, dans la partie nord des hautes-terres de Miramichi. Le mClange et l'existence de l'amalgamation structurale des groupes de TCtagouche et Fournier rCsultent de la fermeture du bassin marginal par une subduction, dirigCe vers le nord, 2 la fin de l'ordovicien. La plupart des sequences mafiques dans les boutonnikres d'Elmtree et de Belledune peuvent &re mises en corrClation chimique avec les stquences analogues prksente...
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