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TitlePreliminary chronostratigraphy of the Tetagouche and Fournier groups in northern New Brunswick
DownloadDownload (whole publication)
AuthorSullivan, R W; van Staal, C R
SourceRadiogenic age and isotopic studies: Report 9; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1995-F, 1996 p. 43-56, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (1996). Radiogenic age and isotopic studies: Report 9, Geological Survey of Canada, Current Research no. 1995-F
File formatpdf
ProvinceNew Brunswick
Lat/Long WENS-66.0000 -65.5000 48.0000 47.7500
Subjectsgeochronology; zircon dates; uranium lead dates; radiometric dates; chronostratigraphy; volcanic rocks; basalts; dacites; rhyolites; igneous rocks; oceanic crust; schists; metamorphic rocks; lithology; Tetagouche Group; Fournier Group; Vallée Lourdes Formation; Spruce Lake Formation; Canoe Landing Lake Formation; Boucher Brook Formation; Nepisiguit Falls Formation; Ordovician
Illustrationssketch maps; Concordia diagrams; analyses
ProgramCanada-New Brunswick Cooperation Agreement on Mineral Development, 1990-1995
Released1996 06 01
AbstractSeven U-Pb zircon ages of volcanic rocks from northern New Brunswick are reported and a preliminary stratigraphy of the middle Ordovician Tetagouche and Fournier groups is presented. Deposition of the Tetagouche Group started with calcareous rocks of the Vallée Lourdes Formation in the Late Arenig (>470 Ma). Quartz- and feldspar-phyric felsic volcanic rocks of the immediately overlying Nepisiquit Falls Formation yielded U-Pb zircon ages between ca. 471 and 469 Ma. These volcanic rocks are time stratigraphic equivalents of the feldspar-phyric dacites of the Spruce Lake Formation, which yielded a U-Pb zircon age of ca. 470 Ma, and tholeiitic and alkalic pillow basalts of the structurally overlying Canoe Landing Lake Formation. The final phase of rhyolitic to dacitic volcanism is marked by the emplacement of distinct quartz- and feldspar-phyric dacitic porphyries at ca. 465 Ma, thus limiting silicic volcanism to the Late Arenig and Ilanvirn. During the Ilandeilo and Caradoc (ca. 464-457 Ma) volcanic activity in the Tetagouche Group was characterized by extrusion of alkali basalts and minor comendites, interlayered with dark shales and siltstones of the Boucher Brook Formation. Oceanic crust of the Fournier Group was also formed during this period.