Geology, Sheldon Lake and Tay River map Areas, Yukon Territory

Gordey, S P; Irwin, S E B; Roddick, J A; Green, L. H.; Tempelman-Kluit, D J

doi:10.4095/125162

Cited by 3 publications

(2 citation statements)

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“…Late Triassic Jones Lake Formation strata lie in fault contact with Cretaceous South Fork Volcanics and Paleozoic Road River and Earn group rocks in the southwestern Sheldon Lake (NTS 105J) map area of eastern Yukon (Gordey and Irwin 1987; locality 3 in Fig. 1).…”

Section: Locality 3: Jones Lake Formation Sheldon Lake Map Area Easmentioning

confidence: 98%

Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands

et al. 2010

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Section: Locality 3: Jones Lake Formation Sheldon Lake Map Area Easmentioning

confidence: 98%

Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands

et al. 2010

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“…The Glenlyon batholith intrudes Neoproterozoic to early Paleozoic rocks of the Cassiar terrane immediately west of the Tintina fault. The Anvil batholith is emplaced into early Paleozoic rocks of distal miogeoclinal affinity just east of the Tintina fault; related plutons nearby also cut rocks of the allochthonous Nisutlin and Anvil assemblages (Gordey and Irwin 1987). There is thus a progression in tectonic position for the three plutonic systems, in the order Cassiar-Glenlyon-Anvil, from more outboard to most inboard with respect to cratonic North America (see Fig.…”

Section: Introductionmentioning

confidence: 97%

Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia

Patchett¹,

Gehrels

Isachsen³

1998

Can. J. Earth Sci.

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Nd isotopic data are presented for a suite of metamorphic and plutonic rocks from a traverse across the Coast Mountains between Terrace and Prince Rupert, British Columbia, and for three contrasting batholiths in the Omineca Belt of southern Yukon. A presumed metamorphic equivalent of Jurassic volcanic rocks of the Stikine terrane gives ε Nd = +6, and a number of other metaigneous and metasedimentary rocks in the core of the Coast Mountains give ε Nd values from +3 to +7. A single metasedimentary rock approximately 3 km east of the Work Channel shear zone gives a ε Nd value of -9. Coast Belt plutons in the traverse yield ε Nd from -1 to +2. The Omineca Belt plutons give ε Nd from -10 to -17. All results are consistent with published data in demonstrating that (i) juvenile origins for both igneous and metamorphic rocks are common in the Coast Belt; (ii) representatives of a continental-margin sedimentary sequence with Precambrian crustal Nd are tectonically interleaved in the Coast Mountains; (iii) Coast Mountains plutons can be interpreted as derived from a blend of metamorphic rocks like those seen at the surface, or as arc-type melts contaminated with the older crustal component; and (iv) Omineca Belt plutons are dominated by remelted Precambrian crustal rocks.Résumé : Les données des isotopes du Nd sont discutées pour une suite de roches métamorphiques et plutoniques le long d'une ligne transversale à la chaîne Côtière, entre Terrace et Prince Rupert, en Colombie-Britannique, et pour trois batholites distincts dans le Domaine d'Omineca, de la région méridionale du Yukon. Des roches métamorphiques présumées équivalentes aux roches volcaniques jurassiques du terrane de Stikine fournissent ε Nd = +6 , et plusieurs autres roches méta-ignées et métasédimentaires au coeur de la chaîne Côtière donnent des valeurs ε Nd de +3 à +7. Un seule roche métasédimentaire localisée à environ 3 km à l'est de la zone de cisaillement de Work Channel, a fourni une valeur ε Nd de -9. Les plutons du Domaine côtier sur la ligne transversale procurent des valeurs ε Nd de -1 à +2. Les plutons du Domaine d'Omineca donnent des valeurs ε Nd de -10 à -17. Tous ces résultats sont compatibles avec les données déjà publiées et démontrent que (i) dans le Domaine côtier, les origines juvéniles sont identiques tant pour les roches ignées que pour les roches métamorphiques; (ii) les roches représentatives de la séquence sédimentaire de marge continentale portant une signature de Nd crustal du Précambrien sont tectoniquement imbriquées dans la chaîne Côtière; (iii) les plutons de la chaîne Côtière peuvent être interprétés comme le résultat d'un mélange de roches métamorphiques analogues à celles exposées en surface, ou de magmas de type d'arc contaminés par un composant crustal plus vieux; et (iv) les roches crustales précambriennes de refonte prédominent dans les plutons du Domaine d'Omineca.[Traduit par la rédaction]

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Rhyolitic calderas of the Yukon‐Tanana Terrane, east central Alaska: Volcanic remnants of a Mid‐Cretaceous magmatic arc

Bacon¹,

Foster²,

Smith³

1990

J. Geophys. Res.

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Four large but poorly exposed rhyolitic calderas are present in the Yukon‐Tanana terrane (YTT) in east central Alaska. At least two are mid‐Cretaceous in age (∼93 Ma). Similar volcanic rocks, the South Fork Volcanics, occur northeast of the Tintina fault in Yukon Territory. Evidence for the calderas consists of thick deposits of de vitrified crystal‐ and lithic‐rich densely welded tuff, interpreted as caldera fill, associated with lava domes or shallow intrusive rocks. Coeval outflow sheets have been largely stripped by erosion. The calderas are preserved within a northeast trending depression extending across the axis of the elongate mid‐Cretaceous plutonic province. Trace element abundances in andesites and rhyolites associated with the caldera structures are similar to those of volcanic and plutonic rocks of subduction‐related magmatic arcs developed on continental crust and thus are suggestive of formation in such an environment. Late Cretaceous and early Tertiary igneous rocks in the YTT near the calderas are interpreted to have been emplaced in a more extensional setting when the subduction‐related magmatic front was farther ocean ward.

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Geology, Sheldon Lake and Tay River map Areas, Yukon Territory

Cited by 3 publications

References 0 publications

Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands

Provenance of North American Triassic strata from west-central and southeastern Yukon: correlations with coeval strata in the Western Canada Sedimentary Basin and Canadian Arctic Islands

Nd isotopic characteristics of metamorphic and plutonic rocks of the Coast Mountains near Prince Rupert, British Columbia

Rhyolitic calderas of the Yukon‐Tanana Terrane, east central Alaska: Volcanic remnants of a Mid‐Cretaceous magmatic arc

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