A petrochronological approach for the detrital record: Tracking mm-sized eclogite clasts in the northern Canadian Cordillera

Kellett, Dawn A.; Weller, Owen M.; Zagorevski, A; Regis, Daniele

doi:10.1016/j.epsl.2018.04.036

Cited by 19 publications

(24 citation statements)

References 44 publications

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“…190-185 Ma; Colpron et al, 2015). Eclogitic clasts found in Pliensbachian-earliest Toarcian strata of the Whitehorse trough record cooling through the rutile U-Pb closure window in the Early Jurassic, consistent with exhumation along a suture zone in the earliest Jurassic (Kellett et al, 2018).…”

Section: Triassic-jurassic Regional Deformationmentioning

confidence: 83%

Triassic–Jurassic Accretionary History and Tectonic Origin of Stikinia From U‐Pb Geochronology and Lu‐Hf Isotope Analysis, British Columbia

et al. 2021

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The timing of assembly and tectonic origins of terranes in the northern Cordillera of Alaska, British Columbia, and the Pacific Northwest are debated. Stikinia, a long-lived arc terrane, has an enigmatic regional Mesozoic accretionary history and its tectonic origins remain unconstrained. Zircon U-Pb geochronology and Lu-Hf isotopic data on Triassic-Jurassic sedimentary and igneous rocks from central Stikinia shed light on the terrane-scale effects of a latest Triassic-Early Jurassic collision between Stikinia and pericratonic Yukon-Tanana terrane. Main age peaks from central Stikinia are 250-160 Ma, reflecting ongoing Mesozoic arc-related igneous activity within Stikinia. Comparison of isotopic evolution and unconformity development between central Stikinia and northern Stikinia (Whitehorse trough) provide new constraints on regional latest Triassic-earliest Jurassic deformation. We attribute the shortening-related deformation to variable along-strike interactions during end-on collision with the Yukon-Tanana terrane, with significant crustal thickening at the northern apex of Stikinia that did not persist farther south. A small pre-Devonian zircon population is significant, as the oldest exposed rocks in Stikinia are Early Devonian. Pre-Devonian age peaks differ from those of the northern Yukon-Tanana terrane, but resemble zircons from southern Wrangellia. These zircons are likely multi-cyclic, derived from crust that originated in the Arctic region near the northern end of the Caledonide orogeny. We suggest that Stikinia was an independent crustal block prior to latest Triassic onset of collision with Yukon-Tanana terrane. The ongoing, end-on collision in turn promoted oroclinal assembly of the peri-Laurentian terranes. GEORGE ET AL.

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Section: Triassic-jurassic Regional Deformationmentioning

confidence: 83%

Triassic–Jurassic Accretionary History and Tectonic Origin of Stikinia From U‐Pb Geochronology and Lu‐Hf Isotope Analysis, British Columbia

et al. 2021

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“…Early Jurassic eclogite clasts (197-181 Ma cooling profiles) occur in Pliensbachian-Toarcian conglomerates of the Whitehorse trough in northern British Columbia ("Eclogite ridge" and Atlin Lake, Fig. 3; Kellett et al, 2018). The conglomerates also contain metamorphic and plutonic clasts (Mihalynuk, 1999;Shirmohammad et al, 2011; Atlin Lake, Lisadele Lake areas, Fig.…”

Section: Revised Modeling For Accretion Of the Intermontane Terranesmentioning

confidence: 99%

Latest Triassic–Early Jurassic Stikine–Yukon-Tanana terrane collision and the onset of accretion in the Canadian Cordillera: Insights from Hazelton Group detrital zircon provenance and arc–back-arc configuration

2022

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The Hazelton Group is a Rhaetian–Bajocian (uppermost Triassic–Middle Jurassic) volcano-sedimentary sequence that represents both the last pre-accretionary arc volcanic cycle of Stikinia and its early synaccretionary aftermath. Hazelton magmatism of central Stikinia succeeded the Late Triassic (mainly Carnian–Norian) Stuhini arc, which ceased activity as a result of end-on collision with the pericratonic Yukon-Tanana terrane. The Hazelton volcanic belt lies to the south along strike with the coeval Whitehorse trough, the synorogenic clastic basin that developed on top of the Stikinia–Yukon-Tanana collision zone. Whereas the sources of voluminous clastic sediments in the Whitehorse trough were its rapidly exhuming shoulders, the thin clastic intervals in the Hazelton Group in northwestern British Columbia were derived from local to subregional block uplifts that supplied mainly ca. 230–215 Ma zircons eroded from the plutonic roots of the Stuhini arc. Lesser components include late Paleozoic (ca. 350–330 Ma) zircons from Stikinia’s basement and penecontemporaneous (ca. 205–172 Ma) zircons from Hazelton volcanic/subvolcanic sources. Reexamination of the four main volcanic fields that make up the lower Hazelton Group suggests that the main Hazelton volcanic belt formed a southward-convex magmatic arc from eastern Stikinia across the Skeena arch, including the Toodoggone and Telkwa belts, with the Spatsizi and Stewart-Iskut regions of northwestern British Columbia in its back-arc. The Whitehorse trough and Hazelton belt represent a collision zone to active arc pair. Southward advance of the arc and counterclockwise rotation of the Stikinia microplate contributed to closure against the Quesnellia arc and assembly of the inner Canadian Cordilleran terrane collage.

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“…In the Yukon‐Tanana terrane, widespread shortening and metamorphism occurred during the latest Triassic to Early Jurassic (∼205 to 180 Ma), and to a lesser extent, during the Middle Jurassic (Figures 9b–9e; e.g., Berman et al., 2007; Clark, 2017; Colpron et al., 2015; Gaidies et al., 2020; Kellett et al., 2018; Logan & Mihalynuk, 2014; Mihalynuk et al., 2006; Nixon et al., 2020; Ryan et al., 2021; Staples et al., 2016). Crustal thickening was accommodated by intra‐terrane shear zones such as the Yukon River shear zone (“A”—Figures 9b–9d; Parsons, Coleman, et al., 2018; Ryan et al., 2014, 2021), and was followed by rapid cooling and exhumation during the Early to Middle Jurassic (Figure 9e; e.g., Johnston et al., 1996; Joyce et al., 2015; Ryan et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

U‐Pb Zircon Geochronology From the Northern Cordillera, Central Yukon, With Implications for Its Tectonic Assembly

et al. 2022

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A petrochronological approach for the detrital record: Tracking mm-sized eclogite clasts in the northern Canadian Cordillera

Cited by 19 publications

References 44 publications

Triassic–Jurassic Accretionary History and Tectonic Origin of Stikinia From U‐Pb Geochronology and Lu‐Hf Isotope Analysis, British Columbia

Triassic–Jurassic Accretionary History and Tectonic Origin of Stikinia From U‐Pb Geochronology and Lu‐Hf Isotope Analysis, British Columbia

Latest Triassic–Early Jurassic Stikine–Yukon-Tanana terrane collision and the onset of accretion in the Canadian Cordillera: Insights from Hazelton Group detrital zircon provenance and arc–back-arc configuration

U‐Pb Zircon Geochronology From the Northern Cordillera, Central Yukon, With Implications for Its Tectonic Assembly

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