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New analyses of mafic igneous rocks from the central Miramichi Highlands have led us to modify the interpretation of its tectonic setting. New samples have been obtained from the Bam ford Brook and Trousers Lake areas of New Brunswick, and the Danforth area in Maine. All subalkalic mafic rocks, including the Trousers Lake striped amphibolites, are associated with a thick sequence of metasedimentary rocks and all are continental tholeiites, analogous to tholeiitic suites in the Tetagouche Group of the northern Miramichi Highlands. The presence of alkalic basalt and comendite in this area supports this correlation. In the southern Miramichi Highlands of Maine, silicic and intermediate volcanic rocks form part of the Woodstock-Meductic arc-related volcanic suite.   RESUME  De nouvelles analyses de roches ignees mafiques provenant du centre des hautes-terres de la Miramichi nous ont conduit a modifier l’interpretation de leur environnement tectonique. De nouveaux echantillons ont ete recueillis dans les regions du ruisseau Bamford et du lac Trousers au Nouveau-Brunswick, et dans la region de Danforth au Maine. Toutes les roches mafiques subalcalines, incluant les amphibolites rubannees du lac Trousers, sont associees avec une sequence epaisse de roches metasedimentaires et sont toutes des tholeiites continentales, similaires aux suites tholeiitiques appartenant au Groupe de Tetagouche du nord des hautes-terres de la Miramichi. La presence de basaltes alcalins et de comendites dans cette region appuie cette correlation. Dans le sud des hautes-terres de la Miramichi au Maine, les volcanites siliceuses et inlermddiaires constituent une partie de la suite volcanique d'arc de Woodstock-Meductic.  [Traduit par le journal]

atlantic geology

Ordovician volcanic and hypabyssal rocks in the central and southern Miramichi Highlands: their tectonic setting and relationship to contemporary volcanic rocks in northern New Brunswick