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

Beranek, Luke P.; Mortensen, James K.; Orchard, Michael J.; Ullrich, Thomas

doi:10.1139/e09-065

Cited by 46 publications

(53 citation statements)

References 48 publications

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“…Olenekian shale samples from the type section have elevated Cr, Ni, and Co values relative to the underlying Paleozoic stratigraphy, suggesting at least partial derivation from ferromagnesian, mafic source rocks. These compositional data are consistent with Paleozoic rocks of the Yukon-Tanana and Slide Mountain terranes being a partial source for Jones Lake Formation strata [Beranek et al, 2010a], although systematic detrital zircon studies are required to evaluate the provenance of Triassic strata in the northern Cordillera. Such provenance analysis is feasible because the U-Pb zircon age signatures of Cordilleran terranes and Laurentian strata are generally well known.…”

Section: Triassic Stratigraphic Assemblages In the Northern Cordillerasupporting

confidence: 64%

“…We analyzed samples of coarse-grained, chert lithic sandstone and feldspathic sandstone of uncertain age at the base of the Triassic succession, along with two samples of chert pebble conglomerate that comprise part of an imbricated thrust sheet that structurally overlies Norian limestone. These samples Beranek et al [2010a]. Abbreviation: MDA -maximum depositional age of sample derived from the youngest detrital zircon.…”

Section: Northern Finlayson Lake Belt Southeastern Yukon (Locality 7)mentioning

confidence: 99%

“…[17] The composition and tectonic setting of Triassic continental margin rocks in Yukon were first constrained by Beranek et al [2010a]. At the type section of the Olenekian Jones Lake Formation along the Yukon-Northwest Territories border, ∼200 km northeast of the Inconnu thrust, a basal sandstone unit yielded Devono-Mississippian (360 ± 35 Ma) detrital muscovite and a single Early Mississippian (338 Ma) detrital zircon grain.…”

Section: Triassic Stratigraphic Assemblages In the Northern Cordilleramentioning

confidence: 99%

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The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

Beranek¹,

2011

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The northern Canadian Cordillera exhibits coeval accreted arc, subduction zone, ocean basin, and continental margin assemblages that make the region an exceptional place to understand tectonic processes involved in arc‐continent collision. In this study, we use U‐Pb zircon and monazite geochronology to define the timing and provenance record of Late Permian collisional orogeny related to the accretion of the Yukon‐Tanana terrane onto the ancestral North American continental margin of northwestern Canada. New U‐Pb crystallization ages of Permian intrusive rocks in the Klondike District of western Yukon bracket the timing of collision‐related ductile deformation and greenschist‐ to amphibolite‐facies metamorphism on the Yukon‐Tanana terrane between 260 and 252.5 Ma. This tectonothermal event is herein named the Klondike orogeny. Detrital zircon U‐Pb geochronology of Triassic strata provides the sedimentary record of arc‐continent collision and crustal reworking along the Cordilleran margin. Arc‐derived detrital zircons in Early to Middle Triassic (251–235 Ma) strata overlying the ancestral North American continental margin in Yukon suggest that a foreland‐style basin developed adjacent to the Klondike orogen. Regionally extensive Late Triassic (235–200 Ma) strata containing primarily North American detrital zircons form an overlap assemblage that covered the accreted terranes and western North America. The timing of the Klondike orogeny is roughly synchronous with other contractional events along the ∼5000 km strike length of the Cordillera, including the Late Permian‐Early Triassic Sonoman orogeny in Nevada. Global plate reorganization linked to assembly of Pangaea may have been the tectonic engine for late Paleozoic‐early Mesozoic development of the North American Cordillera.

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Section: Triassic Stratigraphic Assemblages In the Northern Cordillerasupporting

confidence: 64%

Section: Northern Finlayson Lake Belt Southeastern Yukon (Locality 7)mentioning

confidence: 99%

Section: Triassic Stratigraphic Assemblages In the Northern Cordilleramentioning

confidence: 99%

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The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

Beranek¹,

2011

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“…Between the Middle Permian, when characteristic Yukon-Tanana terrane was at the latitude of Texas, and the Middle Triassic, when Yukon-Tanana terrane detrital zircons fi rst appear in rocks of the northwestern North American continental margin sequence (Beranek, 2009;Beranek et al, 2010), the Slide Mountain ocean must have closed and Yukon-Tanana terrane translated dextrally by at least the same amount as it was translated sinistrally during the opening of the Slide Mountain ocean. Some of this displacement may have been partitioned onto the Jules Creek-Vangorda fault.…”

Section: Implications For the Geodynamic Evolution Of Slide Mountain mentioning

confidence: 99%

“…Numerous lines of evidence suggest that Yukon-Tanana terrane, the largest pericratonic arc terrane, was a part of northwestern Laurentia before the onset of Late Devonian backarc rifting (Colpron et al, , 2007Nelson et al, 2006;Piercey and Colpron, 2009); however, by the mid-Permian, it and companion terranes were at suffi ciently southerly latitudes for limestone containing the McCloud fusilinid fauna to have been deposited on them (Miller, 1988;Stevens, 1995;Belasky et al, 2002;Nelson et al, 2006). Because species of the McCloud fauna occur on the craton only as far north as the latitude of Texas (Ross, 1969), there is an implication that the Slide Mountain ocean had signifi cant strike-slip displacement, before fi nal re-attachment to northwestern Laurentia by the Triassic (Beranek et al, 2010). At present, however, the details of this displacement history are not completely understood.…”

Section: Introductionmentioning

confidence: 99%

Lithosphere-asthenosphere mixing in a transform-dominated late Paleozoic backarc basin: Implications for northern Cordilleran crustal growth and assembly

2012

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The Slide Mountain terrane is part of a North American Cordillera-long backarc basinal assemblage that developed between the ensialic arc terranes (Yukon-Tanana and affi liated pericratonic terranes) and the North American craton in the middle to late Paleozoic. The Slide Mountain basin started to open in the Late Devonian, and spreading continued through the late Paleozoic in an oblique (transform-dominated) manner such that the pericratonic terranes were translated into southerly latitudes. The basin closed, also in an oblique manner, by the Early Triassic, resulting in the reaccretion of the Yukon-Tanana terrane to the northwestern Laurentian margin. Both the opening and closing likely involved hundreds to possibly thousands of kilometers of intra-ocean and/or intra-arc strike-slip displacement, sinistral during the ocean's Late Devonian to mid-Permian opening and dextral during its Late Permian closing.In southeastern Yukon, Canada, the Early Permian Slide Mountain terrane is dominated by mafi c and ultramafi c volcanic and plutonic rocks of the Campbell Range Formation. These rocks are narrowly distributed, for over 300 km, on either side of the Jules Creek-Vangorda fault, a fault that separates Slide Mountain terrane from Yukon-Tanana terrane. The Campbell Range basaltic volcanic and high-level intrusive rocks have geochemical and isotopic signatures that vary systematically across the Jules Creek-Vangorda fault: ocean-island basalt (OIB) and enriched mid-ocean ridge basalt (E-MORB) suites with lower εNd t occur exclusively south of the fault, whereas north of the fault they have normal midocean ridge basalt (N-MORB) and backarc basin basalt (BABB) signatures with higher εNd t values. The εNd t values are inversely correlated with Nb/Th pm and Nb/La pm , suggesting that the lower εNd t values present in the E-MORB and OIB are mantle source features of these basalts and not due to continental crustal contamination. Isotopic and multi-element mixing calculations illustrate that the OIB-like basalts were derived primarily from enriched continental lithospheric mantle, whereas the N-MORB and BABB suites were sourced primarily from the upwelling backarc asthenospheric mantle; E-MORBs represent mixtures of depleted asthenospheric and enriched lithospheric mantle. The geochemical and isotopic variations in the Campbell Range Formation across the Jules Creek-Vangorda fault is attributed to formation in different parts of an extending continental-backarc basin and then their subsequent juxtaposition by continued displacement along the fault.Despite the juvenile isotopic signatures present in the Slide Mountain terrane, they occur as thin klippe atop rocks of recycled continental crustal affi nity, suggesting that they were likely only minor contributors to Cordilleran crustal growth.

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High‐resolution sequence stratigraphy of the Middle Triassic Sunset Prairie Formation, Western Canada Sedimentary Basin, north‐eastern British Columbia

Furlong

Gingras

Zonneveld

2020

The Depositional Record

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The Middle Triassic Sunset Prairie Formation has been recently identified between the Lower Triassic Montney Formation and the Middle Triassic Doig Formation in the Western Canada Sedimentary Basin. Due to its recent recognition, the Sunset Prairie Formation has yet to be incorporated into sequence stratigraphic frameworks of the Triassic. Through the investigation of 25 cored wells, facies characteristics, vertical facies stacking and lateral facies distributions have been identified and described. Sequence stratigraphic surfaces were identified in core and extrapolated to geophysical wireline log signatures of 248 wells within the basin. The Sunset Prairie Formation can be divided into three, upward-coarsening parasequences that exhibit a retrogradational stacking pattern. All parasequences of the Sunset Prairie Formation are truncated at their tops by the Doig phosphate zone. The Sunset Prairie Formation truncates the underlying Montney Formation, suggesting that the stratigraphic interval is unconformity bound by sequence boundaries and their correlative conformities. The addition of the Sunset Prairie Formation reveals a discrete sequence of transgressive deposits previously unaccounted for within the Triassic sequence stratigraphic framework of the Western Canada Sedimentary Basin. K E Y W O R D S Doig phosphate zone, ichnology, Montney Formation, sedimentology, stratigraphy, Sunset Prairie Formation, Triassic 384 | FURLONG et aL.

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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

Cited by 46 publications

References 48 publications

The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

The timing and provenance record of the Late Permian Klondike orogeny in northwestern Canada and arc‐continent collision along western North America

Lithosphere-asthenosphere mixing in a transform-dominated late Paleozoic backarc basin: Implications for northern Cordilleran crustal growth and assembly

High‐resolution sequence stratigraphy of the Middle Triassic Sunset Prairie Formation, Western Canada Sedimentary Basin, north‐eastern British Columbia

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