Preliminary geological map of Glenlyon (105 L/1 - 7, 11 - 14) and northwest Carmacks (115 I/9, 16) areas, Yukon Territory

Colpron, Maurice; Murphy, Donald C.; Nelson, JL; Roots, C F; Gladwin, K; Gordey, S P; Abbott, Grant; Lipovsky, Panya

doi:10.4095/215893

Cited by 3 publications

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“…The present crustal architecture of the Intermontane terranes in central Yukon was acquired through superposition of Jurassic to Late Cretaceous (and younger) structures (Calvert et al., 2017; Nelson et al., 2013). The Cretaceous structures dissected and overprinted older Jurassic faults such as the Tadru and Needlerock faults (Figures 2 and 3; Colpron et al., 2002, 2003). The Needlerock thrust is a folded thrust fault that juxtaposes the Snowcap assemblage (Yukon‐Tanana terrane) in its hanging wall with greenstone and amphibolite of the Boswell assemblage in its footwall.…”

Section: Discussionmentioning

confidence: 99%

“…In Yukon, these plutons define a central belt that stitches Stikinia, Cache Creek, and WT west of the Teslin fault (Figure 2). Major Jurassic structures include the King Salmon, Nahlin, Wann River, and Llewellyn faults in northern British Columbia (Currie & Parrish, 1993; Gabrielse, 1998; Mihalynuk et al., 1999), and the Needlerock, Tadru, and Yukon River faults in Yukon (Figure 3; Colpron et al., 2002, 2003; Colpron & Ryan, 2010; Parsons et al., 2018; Ryan et al., 2013, 2014). Metamorphic studies of the Yukon‐Tanana terrane in western Yukon and northwestern British Columbia indicate that structural imbrication led to crustal thickening, tectonic burial to depths of 20–30 km, and subsequent exhumation in the Early Jurassic (Berman et al., 2007; Clark, 2017; Dyer, 2020; Gaidies et al., 2021).…”

Section: Accretionary History Of the Intermontane Terranesmentioning

confidence: 99%

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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

et al. 2022

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Crustal growth at convergent margins is generally thought to occur through accretion of juvenile arc crust and/ or addition of magmatic material to the edge of a craton (e.g., Rudnick, 1995). Arc-continent collision zones are thus major sites for crustal growth through time (e.g., Brown et al., 2011). Arc accretion generally leads to development of an accretionary orogen, associated magmatism and basin(s) (e.g., Cawood et al., 2009;Draut & Clift, 2012). The evolution of arc-continent collision zones is generally complex and shows a wide-range of variations depending on configuration of continental and arc crusts, and angle and rates of convergence (Brown et al., 2011). There is no simple model that explains the variations observed in modern and ancient arc-continent collisions.In western North America, the development of the northern Cordilleran accretionary orogen began with collision of early Mesozoic peri-Laurentian arcs with the continental margin in latest Triassic to

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Section: Discussionmentioning

confidence: 99%

Section: Accretionary History Of the Intermontane Terranesmentioning

confidence: 99%

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

et al. 2022

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“…Southwest of the TFZ, the structure in the Yukon-Tanana terrane is dominated by a broad synclinorium (D 2 ) that is cored by volcanic rocks of the Little Salmon Formation and the Bearfeed allochthons (Figs. 2, 7) (Colpron and Reinecke 2000;Colpron et al 2002). Evidence for an older phase of deformation is developed locally in pelitic horizons within the Drury Formation along the east flank of the synclinorium, where S 2 schistosity cuts across and is discordant to the axial planar surfaces of early isoclinal folds.…”

Section: Structurementioning

confidence: 99%

“…7. Schematic cross section of the Yukon-Tanana terrane and the Tummel fault zone (TFZ) north of Little Salmon Lake (modified after Colpron et al 2002). Approximate lines of section and legend are shown in Fig.…”

Section: Structurementioning

confidence: 99%

“…In this region, the accretion boundary corresponds to the Tummel fault zone (TFZ; Colpron et al 2002), a 3-4 km wide, northwest-trending belt that consists of imbricate fault slices of Slide Mountain terrane (greenstone, chert, serpentinite) and synorogenic clastic rocks which separates Yukon-Tanana terrane to the southwest from Cassiar terrane to the northeast (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

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Geology and juxtaposition history of the Yukon-Tanana, Slide Mountain, and Cassiar terranes in the Glenlyon area of central Yukon

Colpron

Gladwin²,

Johnston

et al. 2005

Can. J. Earth Sci.

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Abstract:In central Yukon, the pericratonic Yukon-Tanana terrane (YT) is juxtaposed with the Cassiar terrane (CT, parautochthonous North America) along the Tummel fault zone (TFZ), a 3-4 km wide, northwest-trending belt comprising imbricate fault slices of Slide Mountain terrane (SM, greenstone, chert, serpentinite) and synorogenic clastic rocks. Northeast of the TFZ, the CT comprises Paleozoic metapelitic rocks, marble, and amphibolite of continental margin affinity. To the southwest, the YT consists of a pre-Late Devonian metasedimentary complex overlain and intruded by Mississippian clastic, volcanic, and plutonic successions of continental arc affinity. In the TFZ, Middle to Late Permian ocean-floor basalt of the SM shows evidence of crustal contamination, suggesting deposition at the edge of a marginal ocean basin. Deformation features in the TFZ include early ductile fabrics overprinted by younger brittle structures. Triassic synorogenic clastic rocks in the TFZ, and at the base of a klippen above the YT, suggest that terrane imbrication began shortly after the Early Triassic.40 Ar/ 39 Ar mica ages from the region suggest cooling of the YT, SM, and part of CT below 300°C by Early Jurassic time. Pervasive brittle structures in the Ragged Lake klippe, which roots into the TFZ, indicate brittle thrusting of the SM over the CT in post-Triassic time. Early Cretaceous plutons intrude the CT (Glenlyon Batholith) and the TFZ (leucogabbro) and impose a contact aureole that extends westward into the YT. Steep brittle structures that deformed the TFZ also affect, in part, the Glenlyon Batholith but do not significantly offset its contact aureole. Consequently, little displacement can have occurred along the TFZ after Early Cretaceous time.Résumé : Dans le centre du Yukon, le terrane péricratonique Yukon-Tanana (YT) est juxtaposé au terrane Cassiar (CTAmérique du Nord parautochtone) le long de la zone de faille Tummel (TFZ) -une ceinture de 3 à 4 km de large, à tendance nord-ouest et comprenant des tranches de faille imbriquées du terrane de Slide Mountain (SM -roches vertes, chert, serpentinite) et des roches clastiques synorogéniques. Au nord-est de la TFZ, le CT comprend des roches métapélitiques, du marbre et des amphibolites d'affinité de bordure continentale datant du Paléozoïque. Vers le sud-ouest, le YT comprend un complexe métasédimentaire datant du pré-Dévonien tardif; des successions volcaniques et plutoniques, d'affinité d'arc continental, datant du Mississippien, le recouvrent et le pénètrent. Dans la TFZ, un basalte de plancher océanique (Permien moyen à tardif) du terrane de SM montre des évidences de contamination crustale suggérant une déposition à la bordure d'un bassin océanique. Les caractéristiques de déformation dans la TFZ comprennent une surimpression des textures ductiles précoces par des structures cassantes plus jeunes. Les roches clastiques synorogéniques (Trias) dans la TFZ et à la base d'une klippe au-dessus du YT, indiqueraient que l'imbrication des terranes a débuté peu de temps après l...

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Zircon and the role of magmatic petrogenesis in the formation of felsic-hosted volcanogenic massive sulfide (VMS) deposits: a case study from the mid-Paleozoic Yukon-Tanana terrane, northern Canadian Cordillera

Manor,

Piercey,

Wall

2023

Miner Deposita

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Magmatism is a critical component in sustaining hydrothermal convection and metal transport during the formation of volcanogenic massive sulfide (VMS) deposits. Previous studies of magmatic petrogenesis in VMS systems have demonstrated that ore-related volcanic rocks have distinct whole-rock geochemical and isotopic signatures (i.e., high HFSE, REE, Th, εHf-Nd, zircon saturation T) relative to barren volcanic rocks, which supports models of elevated crustal heat flow during periods of ore deposition; however, the petrologic characteristics and intrinsic parameters (e.g., T, fO2) related to these magmatic events in VMS districts remain poorly understood. Arc–back-arc assemblages from the mid-Paleozoic Yukon-Tanana terrane are well-characterized and include the Finlayson Lake VMS district, which is host to several felsic-hosted deposits (e.g., Kudz Ze Kayah, GP4F, Wolverine) that were generated in a peri-Laurentian continental back-arc tectonic setting. In this study, zircon from back-arc and coeval arc rocks in the Yukon-Tanana terrane was used as a proxy for primary magma formation conditions that generated VMS-proximal and VMS-distal stratigraphy. Our results indicate that zircon grains in VMS-proximal environments have unique textural, geochemical, and isotopic characteristics (e.g., low-aspect ratios, greater abundance of zircon-phosphate intergrowths, Th/U > 1, Zr/Hf > 80, Tzrc > 780 °C, εHfi > –7) that are clearly distinguished from zircon in VMS-distal rocks in both the back-arc and arc settings (Th/U < 1, Zr/Hf < 80, Tzrc < 780 °C, εHfi < –7). These signatures correlate to VMS-proximal magmas that were hotter, less fractionated, and contained greater juvenile melt contributions compared to VMS-distal magmas and reflect a series of high-flux magmatic events that directly correspond to the early tectonic development of Yukon-Tanana terrane. Moreover, this study underscores the importance of mineral-scale petrology, geochemistry, and geochronology in defining the primary magmatic conditions that generated VMS-related felsic rocks and highlights the utility of zircon as a prospectivity tool in both grassroots and brownfields VMS exploration.

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Preliminary geological map of Glenlyon (105 L/1 - 7, 11 - 14) and northwest Carmacks (115 I/9, 16) areas, Yukon Territory

Cited by 3 publications

References 0 publications

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

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

Geology and juxtaposition history of the Yukon-Tanana, Slide Mountain, and Cassiar terranes in the Glenlyon area of central Yukon

Zircon and the role of magmatic petrogenesis in the formation of felsic-hosted volcanogenic massive sulfide (VMS) deposits: a case study from the mid-Paleozoic Yukon-Tanana terrane, northern Canadian Cordillera

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