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Revisiting the “Klondike Orogeny”: Permian to Jurassic development of the Yukon‐Tanana terrane, northern Canadian Cordillera
The Permian evolution of the Yukon‐Tanana terrane and closure of the Slide Mountain Ocean in the northern Cordillera have been inferred to culminate in the collisional “Klondike orogeny,” a northern extension of the Sonoma orogeny of the western USA. The “Klondike orogeny” was thought to be associated with mid‐crustal deformation and metamorphism and development of a thick orogenic welt in the late Permian (ca. 260–252 Ma; Lopingian). A review of lithogeochemical data combined with new U‐Pb geochronology and Hf isotope data of igneous and detrital zircons from the western Yukon‐Tanana terrane supports development of a mid to late Permian (ca. 265–255 Ma; Guadalupian‐Lopingian) arc in a supra‐subduction zone setting. Arc development was preceded by hyper‐extension and emplacement of supra‐subduction zone ophiolites (ca. 268–264 Ma). Precise CA‐TIMS U‐Pb dating of zircon in plutons inferred to constrain the timing of the “Klondike orogeny” show that they are the same age (ca. 260.9 Ma) and that previous dates are too young due to unmitigated Pb loss. A critical review of evidence for regional metamorphism indicates that mid‐crustal deformation and metamorphism is related to accretion of the Intermontane terranes in the Early Jurassic. Mica cooling ages show that the western Yukon‐Tanana terrane was exhumed to upper crustal level in the Jurassic. Sinistral transpression facilitated development of the Yukon‐Tanana terrane and subsequent tectonic activity from mid‐Paleozoic to early Mesozoic and probably linked the Permian closure of the Slide Mountain Ocean with intermittent late Paleozoic deformation culminating in the Sonoma orogeny of the U.S. Cordillera.
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Paleozoic tectonic and metallogenetic evolution of pericratonic terranes in Yukon, northern British Columbia and eastern Alaska
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
A tectonostratigraphic framework for the pericratonic terranes of the northern Canadian Cordillera
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
Character and metallogeny of Permian, Jurassic and Cretaceous plutons in the southern Yukon-Tanana Terrane
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Between the Swift and Nisutlin rivers, unmetamorphosed granite to ultramafic intrusions of four ages (from Permian through Cretaceous) span the amalgamation of Cassiar Platform with Yukon-Tanana and Cache Creek terranes. The mid-Permian granitic Ram Stock and two plutons cutting the Sylvester Allochthon lie at the edge of the Dorsey Complex, a remnant of an ancient passive margin succession that underlies the volcanic arcs of Yukon-Tanana Terrane. Middle Jurassic, locally foliated granodiorite to gabbro intrusions are metaluminous, and high in Sr and low in Ti compared to the Cretaceous suite. These `I-type volcanic arc plutons may be the remnants of an overlapping arc correlative with the Quesnel Terrane. The Cretaceous (113 to 98 Ma) meta- to peraluminous granites are late orogenic incipient `A-type plutons from highly fractionated F- and Cl-rich magmas. These generated extensive hydrothermal systems that produced tin, tungsten, molybdenum and beryl occurrences.
Late Devonian magmatism and clastic deposition in the upper Earn Group (central Yukon, Canada) mark the transition from passive to active margin along western Laurentia
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for a copy of this paper please contact the Yukon Geological Survey; geology@yukon.ca.
Late Neoproterozoic–early Paleozoic basin evolution in the Coal Creek inlier of Yukon, Canada: implications for the tectonic evolution of northwestern Laurentia
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
Late Triassic to Jurassic Magmatic and Tectonic Evolution of the Intermontane Terranes in Yukon, Northern Canadian Cordillera: Transition From Arc to Syn-Collisional Magmatism and Post-Collisional Lithospheric Delamination
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End-on arc collision and onset of the northern Cordilleran orogen is recorded in Late Triassic to Jurassic plutons in the Intermontane terranes of Yukon, and in development of the synorogenic Whitehorse trough (WT). A synthesis of the extensive data set for these plutons supports interpretation of the magmatic and tectonic evolution of the northern Intermontane terranes. Late Triassic juvenile plutons that locally intrude the Yukon-Tanana terrane represent the northern extension of arc magmatism within Stikinia. Early Jurassic plutons that intrude Stikinia and Yukon-Tanana terranes were emplaced during crustal thickening (200–195 Ma) and subsequent exhumation (190–178 Ma). The syn-collisional magmatism migrated to the south and shows increasing crustal contributions with time. This style of magmatism in Yukon contrasts with coeval, juvenile arc magmatism in British Columbia (Hazelton Group), that records southward arc migration in the Early Jurassic. Exhumation and subsidence of the WT in the north were probably linked to the retreating Hazelton arc by a sinistral transform. East of WT, Early Jurassic plutons intruded into Yukon-Tanana record continued arc magmatism in Quesnellia. Middle Jurassic plutons were intruded after final enclosure of the Cache Creek terrane and imbrication of the Intermontane terranes. The post-collisional plutons have juvenile isotopic compositions that, together with stratigraphic evidence of surface uplift, are interpreted to record asthenospheric upwelling and lithospheric delamination. A revised tectonic model proposes that entrapment of the Cache Creek terrane was the result of Hazelton slab rollback and development of a sinistral transform fault system linked to the collision zone to the north.
A Palaeozoic Northwest Passage: incursion of Caledonian, Baltican and Siberian terranes into eastern Panthalassa, and the early evolution of the North American Cordillera
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
Tectonic assemblage map of Yukon-Tanana and related terranes in Yukon and northern British Columbia (1:1 000 000 scale)
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The Yukon-Tanana Terrane (YTT) is a terrane of pericratonic affinity which occupies an intermediate position between continental margin rocks of Ancestral North America (Cassiar Terrane, Selwyn Basin) to the east and arc and oceanic terranes accreted in Mesozoic time to the west (Quesnellia, Stikinia and Cache Creek). It consists of polydeformed and metamorphosed Paleozoic metasedimentary and meta-igneous rocks which have isotopic and provenance ties to Archean and Proterozoic cratonic source regions, comparable to those of sedimentary strata from northwestern Canada, but whose paleogeographic evolution with respect to the Laurentian craton is enigmatic. The YTT is host to significant base metal occurrences, including the Wolverine and Kudz Ze Kayah deposits in the Finlayson Lake district, in the part of the terrane which lies northeast of Tintina Fault.
Tectonometamorphic evolution of the Kluane metamorphic assemblage, southwest Yukon: evidence for Late Cretaceous eastward subduction of oceanic crust underneath North America
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A copy of this thesis is available at the EMR library – QE195.M3 1997. This thesis is available online at https://doi.org/10.7939/R3DJ58N76.
Paleozoic evolution of the northern Laurentian margin: Evaluating links between the Caledonian, Ellesmerian, and Cordilleran orogens
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for a copy of this paper please contact the Yukon Geological Survey; geology@gov.yk.ca.
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