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- W2337260076 abstract "Volcaniclastic and overlying dark sedimentary rocks of the Klinkit assemblage (NTS 104-O/11) are the youngest of several arc remnants that lie between the Cassiar Platform and Cache Creek terrane in the British Columbia–Yukon border area. New U-Pb geochronological and micropaleontological data indicate Late Carboniferous (or younger) to Late Triassic age for the assemblage. Limestone at the base of the Klinkit assemblage contains Bashkirian conodonts. Intrusive rocks, more deformed than the Klinkit assemblage, are ca. 340 Ma and ca. 320 Ma. A tuff, probably correlative with the Klinkit assemblage, yielded an Early Permian (ca. 281 Ma) date. Middle to Late Triassic conodonts were recovered from the argillaceous upper unit. We conclude that Klinkit volcanism, begun in the Late Carboniferous, continued through Permian time and was followed by Triassic clastic sedimentation. Correlative late Paleozoic volcanic centres and Triassic sedimentary rocks in the pericratonic belt are found in central Yukon and north-central British Columbia. 1 Contribution to the Ancient Pacific Margin NATMAP Project. Current Research 2002-A7 1 C.F. Roots et al. Resume : L’assemblage de Klinkit (SNRC 104-O/11), qui se compose de roches volcanoclastiques surmontees de roches sedimentaires de couleur sombre, forme le plus recent d’une suite de vestiges d’arc intercales entre la plate-forme de Cassiar et le terrane de Cache Creek, pres de la limite entre le Territoire du Yukon et la Colombie-Britannique. De recentes donnees micropaleontologiques et geochronologiques (U-Pb) indiquent que cet assemblage s’echelonne du Carbonifere tardif (ou avant) au Trias moyen. A la base de l’assemblage de Klinkit, un calcaire renferme des conodontes du Bashkirien. Des roches intrusives, plus deformees que celles de l’assemblage de Klinkit, ont livre des âges d’environ 340 Ma et 320 Ma. Un tuf, probablement correlatif de l’assemblage de Klinkit, a ete date du Permien precoce (env. 281 Ma). Des conodontes du Trias moyen et tardif ont ete preleves dans l’unite argileuse superieure. On en deduit que le volcanisme de Klinkit a commence au Carbonifere tardif et s’est poursuivi tout au long du Permien et qu’une sedimentation clastique a pris le relais au Trias. Des centres volcaniques du Paleozoique tardif et des roches sedimentaires du Trias avec lesquels peuvent etre etablies des correlations sont presents a l’interieur de la ceinture pericratonique dans le centre du Territoire duYukon et le centre nord de la Colombie-Britannique." @default.
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- W2337260076 date "2002-01-01" @default.
- W2337260076 modified "2023-09-30" @default.
- W2337260076 title "Constraints on the age of the Klinkit assemblage east of Teslin Lake, northern British Columbia" @default.
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- W2337260076 doi "https://doi.org/10.4095/213072" @default.
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