Post-Taltson sedimentary and intrusive history of the southern Rae Province along the northern margin of the Athabasca Basin, Western Canadian Shield

Ashton, K; Hartlaub, R.P.; Heaman, Larry M.; Morelli, R.M.; Card, Colin; Bethune, Kathryn M.; Hunter, Robert

doi:10.1016/j.precamres.2009.09.004

Cited by 44 publications

(15 citation statements)

References 87 publications

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“…In addition, Ashton et al (2009) suggest that the east-west-trending Uranium City dykes were emplaced in the same s1 stress direction. Furthermore, in their interpretation, the Sparrow dykes are interpreted to be emplaced along a conjugate shear trend of the same east-west compressive stress regime.…”

Section: -1830 Ma: Northwestern Margin Of Laurentiamentioning

confidence: 87%

“…Some authors argue that the coeval Baker Lake basin and the other regional magmatic units formed in response to east-west compression caused by the combination of accretion of a terrane to the west of the Slave craton (NahanniFort Simpson terrane) and the terminal collision of the Trans-Hudson Orogen to the east (e.g., Rainbird et al 2003;Aspler et al 2004;Ashton et al 2009). In addition, Ashton et al (2009) suggest that the east-west-trending Uranium City dykes were emplaced in the same s1 stress direction.…”

Section: -1830 Ma: Northwestern Margin Of Laurentiamentioning

confidence: 99%

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Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes: significance for breakup events within Canada and adjacent regions from 2.5 Ga to the PresentThis article is one of a selection of papers published in this Special Issue on the the theme Lithoprobe—parameters, processes, and the evolution of a continent.Lithoprobe Contribution 1482. Geological Survey of Canada Contribution 20100072.

2010

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Large igneous provinces (LIPs) are high volume, short duration pulses of intraplate magmatism consisting mainly of flood basalts and their associated plumbing system, but also may include silicic components and carbonatites. Many LIPs have an associated radiating diabase dyke swarm, which typically converges on a cratonic margin, identifies a mantle plume centre, and is linked to breakup or attempted breakup to form that cratonic margin. We hypothesize that every major breakup margin in Canada can be associated with a LIP, and we attempt to identify this LIP. To this end, we focus mainly on high-precision age determinations and the distribution of diabase dyke swarms, which are uniquely valued for preserving the record of magmatic events. The analysis extends from the Phanerozoic to the Neoarchean, but our most complete information is for the Superior craton. There, events at 2.50-2.45, 2.22-2.17, and 2.12-2.08 Ga (LIP and plume) are linked with rifting and breakup or attempted breakup of the south-southeastern, northeastern, and southern margins, respectively. Events at 2.00-1.97 Ga are probably linked with the northern margin (Ungava promontory), while the CircumSuperior event at ca. 1.88 Ga is linked to the north to northwestern margins during a time of Manikewan Ocean closure. Similar linkages for other cratons of North America improve understanding of the breakup history to help identify which blocks were nearest neighbours to Canadian crustal blocks in Precambrian supercontinents. Such interpretations provide a framework for interpreting other geological features of these margins to further test models for the timing and location of breakup.Résumé : De nombreuses grandes provinces ignées (LIP) résultent de pulsations de courte durée et de grand volume de magmatisme intraplaque. Elles comprennent principalement des basaltes de plateaux et les systèmes de « plomberie » associés; elles peuvent aussi inclure des composantes siliceuses et des carbonatites. De nombreuses LIP ont un essaim de dykes de diabase qui en rayonnent, lequel converge typiquement vers une bordure cratonique, identifie un centre de panache de manteau et est relié à un fractionnement ou à une tentative de fractionnement pour former la bordure du craton. Nous posons l'hypothèse que chaque grand fractionnement au Canada peut être associé à une LIP et nous tentons d'identifier cette LIP. Pour ce faire, nous nous concentrons surtout sur les déterminations d'âge de grande précision et la distribution des essaims de dykes de diabase, lesquels sont très estimés pour leur préservation des données des événements magmatiques. L'analyse s'étend du Phanérozoïque au Néoarchéen, mais nos données les plus complètes concernent le craton du Supé-rieur. Là, les événements à 2,50-2,45 Ga, 2,22-2,17 Ga et 2,12-2,08 Ga (LIP et panache) sont reliés à la distension et au fractionnement ou à une tentative de fractionnement respectivement des bordures sud-sud-est, nord-est et sud. Les événe-ments qui se sont déroulés vers 2,00-1,97 Ga sont probablement reliés à la b...

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Section: -1830 Ma: Northwestern Margin Of Laurentiamentioning

confidence: 87%

Section: -1830 Ma: Northwestern Margin Of Laurentiamentioning

confidence: 99%

Large igneous provinces (LIPs), giant dyke swarms, and mantle plumes: significance for breakup events within Canada and adjacent regions from 2.5 Ga to the PresentThis article is one of a selection of papers published in this Special Issue on the the theme Lithoprobe—parameters, processes, and the evolution of a continent.Lithoprobe Contribution 1482. Geological Survey of Canada Contribution 20100072.

2010

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“…11A) and detrital age signature , their fi gure 5) that closely match those of psammite sample LB-05. An alternative source region for the detritus includes the southwestern Rae craton, which contains rocks broadly similar in age to the Meta Incognita microcontinent (3.0, 2.71, 2.68-2.58, 2.34-2.29, 2.0-1.9 Ga; Ashton et al, 2009, and references therein). Time-equivalent strata preserved as erosional remnants across the Rae craton on the mainland (e.g., Thluicho Lake Group, upper Amer and Ketyet River groups; Fig.…”

Section: Provenance Of the Piling Groupmentioning

confidence: 99%

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Wodicka

St-Onge

Corrigan

et al. 2014

Geological Society of America Bulletin

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The Paleoproterozoic Piling Group along the southeastern Rae margin, northern Canada, is characterized by thick, deep marine turbidite deposits not observed in timeequivalent, intracratonic basin units further southwest. Models invoked to explain this feature include development of a full-ocean, back-arc, or proto-ocean basin followed by turbidite sedimentation. We present new and existing U-Pb geochronological, Nd isotope, geochemical, and stratigraphic evidence that support a proto-ocean basin model, and we explore the events leading to the formation and closure of such a rift basin during the middle Paleoproterozoic. Sedimentation initiated largely after ca. 2160 Ma with deposition of craton-derived, shallow marine siliciclastic strata (Dewar Lakes formation). Continued extension resulted in accumulation of south-facing carbonate beds (Flint Lake formation) and likely concomitant, arclike tholeiitic to picritic volcanism and voluminous volcani clastic sedimentation (lower Bravo Lake formation) farther outboard at ca. 1980 Ma. Accumulation of intra basinal siliciclastic strata above lower Bravo Lake formation rocks may mark a hiatus in mafi cultramafic magmatism. By ca. 1923 Ma, upper Bravo Lake formation, within-platetype alkaline sill emplacement and vol canism occurred within highly extended crust. The oceanic island basalt-like signatures of the Bravo Lake formation rocks (but lack of depleted, mid-ocean-ridge basalt-type compositions) suggest that by this time the thinned Rae continental lithosphere had fragmented into small crustal block(s) and narrow zone(s) of incipient oceanic crust farther outboard of the Piling Group basin. Rapid subsidence of the southeastern Rae margin ensued, leading to deposition of euxinic (Astarte River formation) and overlying turbiditic strata (Longstaff Bluff formation). The post-ca. 1915 Ma northern turbiditic sedimentary units were likely derived from a thoroughly mixed, two-component source with possible input from the Snowbird tectonic zone and Bravo Lake formation, whereas the post-ca. 1930 Ma southern turbidite unit may have been sourced from the Meta Incognita microcontinent, presently exposed further south. We favor a rift margin over a foreland basin setting for the deposition of the northern turbidite deposits. Subsequent mantle upwelling associated with incipient ocean formation may have triggered melting of highly thinned continental crust resulting in emplacement of latestage, ca. 1897 Ma, contaminated rapakivi granite and highly differentiated mafi c sills. Our results are most consistent, albeit not exclusively, with the much debated model of asthenospheric upwelling and incipient rifting along the Rae-Hearne boundary farther southwest at ca.

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“…These plutons have been interpreted to be a product of syn-to postcollisional extension following the ca. 2.50-2.30 Ga Arrowsmith orogeny (Hartlaub et al, 2007;Ashton et al, 2009Ashton et al, , 2013. In the Elliot Bay region (Fig.…”

Section: Lower Murmac Bay Groupmentioning

confidence: 99%

“…Metamorphic grade in the Murmac Bay Group is lowest (greenschist facies) just east of the Black Bay fault, which marks the boundary between the Beaverlodge domain and the Zemlak domain to the west (Fig. 2), increasing eastward in grade to upper amphibolite and local granulite facies in the central Beaverlodge domain (Hartlaub et al, 2007;Ashton et al, 2009;Bethune et al, 2013). The Black Bay fault is a long-lived discontinuity interpreted to have experienced normal displacement, causing the eastern block to be downthrown ) prior to ca.…”

Section: Metamorphism and Deformationmentioning

confidence: 99%

Provenance approaches in polydeformed metasedimentary successions: Determining nearest neighboring cratons during the deposition of the Paleoproterozoic Murmac Bay Group

2016

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The proximity and positions of cratons constituting the western Canadian Shield prior to and during the Rhyacian Period (2.30-2.05 Ga) are poorly known. In the absence of paleomagnetic data, stratigraphic correlation and detrital zircon isotopic data from sedimentary successions can be used to constrain relative craton positions during their time of deposition. The Murmac Bay Group, a multiply deformed meta sedimentary succession located on the Rae craton margin in Canada, provides an opportunity to test hypotheses regarding its nearest cratonic neighbors during deposition. The polydeformed nature of the Murmac Bay Group, however, presents challenges in determining detailed stratigraphic relationships in the upper succession, which lacks distinct marker beds. Provenance analysis from detrital zircon geochronology provides one strategy for overcoming these challenges. Previous U-Pb geochronology indicates the lower succession was deposited <2.32 Ga, and the upper succession was deposited between <2.17 Ga and >1.94 Ga. We provide new U-Pb detrital zircon ages for the upper succession, including a new maximum depositional age at <2.00 Ga. We integrate our new data with published detrital zircon ages and compare them with published and public-domain igneous crystallization ages stored within a large geochronological database to identify potential provenance locations. While there is no known local source for the ca. 2.17 Ga age population, potential 2.17 Ga sources are found on the neighboring Slave craton and Buffalo Head-Chinchaga domain. Geographically, sources for the remaining dominant age populations (e.g., 2.33 Ga) exist either locally, or between the potential sources for ca. 2.17 Ga zircon grains and our study area. Our results support the interpretation that the Rae and Slave cratons were already amalgamated during upper Murmac Bay Group deposition (<2.00 to >1.94 Ga). This provides an important constraint on the timing of Rae-Slave amalgamation.

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Post-Taltson sedimentary and intrusive history of the southern Rae Province along the northern margin of the Athabasca Basin, Western Canadian Shield

Cited by 44 publications

References 87 publications

Did a proto-ocean basin form along the southeastern Rae cratonic margin? Evidence from U-Pb geochronology, geochemistry (Sm-Nd and whole-rock), and stratigraphy of the Paleoproterozoic Piling Group, northern Canada

Provenance approaches in polydeformed metasedimentary successions: Determining nearest neighboring cratons during the deposition of the Paleoproterozoic Murmac Bay Group

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