Taltson basement gneissic rocks: UPb and Nd isotopic constraints on the basement to the Paleoproterozoic Taltson magmatic zone, northeastern Alberta

McNicoll, Vicki J.; Thériault, R. J.; McDonough, M R

doi:10.1139/cjes-37-11-1575

Cited by 11 publications

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“…1; e.g., Hinchey et al, 2011, and references therein). Rocks of early Paleoproterozoic age are not as widespread, but have been reported from the westernmost Rae craton in the Queen Maud block (2.50-2.39 Ga granitic and sedimentary rocks; Schultz et al, 2007) and within the Taltson-Thelon magmatic zone (2.4 Ga plutonic rocks; e.g., Bostock and Loveridge, 1988;van Breemen et al, 1992;Frisch and Hunt, 1993;McNicoll et al, 2000). A single, ca.…”

Section: Provenance Of the Piling Groupmentioning

confidence: 97%

“…1990-1920 Ma age occur along the western and northern margins of the Rae craton in the Taltson-Thelon magmatic zone ( Fig. 1; e.g., van Breemen et al, 1987;McDonough et al, 2000;McNicoll et al, 2000) and Ellesmere-Devon terrane (Frisch and Hunt, 1988), respectively. However, detritus derived from the Taltson-Thelon magmatic zone, for which a larger U-Pb data set exists compared to the Ellesmere-Devon terrane, would also be expected to contain a spread of early Paleoproterozoic ages (2.5-2.0 Ga) derived from its basement rocks and also present as inherited zircon grains in many of the 1.99-1.92 Ga plutonic rocks (e.g., McDonough et al, 2000;.…”

Section: Provenance Of the Piling Groupmentioning

confidence: 99%

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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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Section: Provenance Of the Piling Groupmentioning

confidence: 97%

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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“…On its northwestern margin the Rae Subprovince is separated from the Slave Craton by the Taltson-Thelon Orogen, which consists of (from northeast to southwest) the Thelon Orogen, the Great Slave Lake Shear Zone, and the Taltson Magmatic Zone. These zones were formed by a 2.0 to 1.9 Ga subduction system that evolved into a collisional orogen (McNicoll et al 2000, Ross 2002, Ross & Eaton 2002) and resulted in peak metamorphic conditions up FIG. 1. Maps showing the regional geology and location of the Hoidas Lake REE deposit.…”

Section: Regional Geologymentioning

confidence: 99%

Hydrothermal Evolution in the Hoidas Lake Vein-Type Ree Deposit, Saskatchewan, Canada: Constraints From Fluid Inclusion Microthermometry and Evaporate Mound Analysis

Pandur¹,

Kontak²,

Ansdell³

2014

The Canadian Mineralogist

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The Hoidas Lake rare earth element (REE) deposit, located in northern Saskatchewan, Canada, is a structurally controlled vein-type LREE deposit with allanite-(Ce) and fluorapatite as the main REE carriers. The mineralized veins cut Archean and Paleoproterozoic orthogneisses and supracrustal rocks of the southern Rae Subprovince. The paragenesis includes hyalophane-bearing pegmatite dikes, REE-mineralized allanite-, diopside-, hornblende-, hyalophane-, and titanite-bearing veins, and later breccia veins that contain several stages of apatite. The mineralized veins record hydrothermal alteration with nucleation of monazite and REE-carbonate inclusions in apatite and allanite, respectively. Barren quartz-, carbonate-, and hematite-rich veins represent the final stage of hydrothermal activity. Samples from the hyalophane-bearing pegmatites, apatite breccia veins, and quartz-carbonate veins, used for fluid inclusion petrography and microthermometry, indicate four distinct fluid inclusion assemblages (FIAs): (1) carbonic inclusions showing L CO2 (liquid CO 2 ) + V CO2 (CO 2 vapor) phase composition with 20-40 vol.% V CO2 at 0°C; (2) aqueous inclusions showing L (liquid H 2 O) + V (H 2 O vapor) phase composition with 90-100 vol.% V at 20°C; (3) aqueous inclusions showing L + V + H (halite) phase composition with 15 vol.% V at 20°C; and (4) aqueous L + V inclusions with 15-20 vol.% V at 20°C. Type 1 inclusions homogenize to liquid CO 2 with Th(CO 2 ) from 3.3 to 30.5°C. Type 2 V-rich inclusions have high salinities and contain salts other than NaCl. Type 3 L-V-H inclusions have different homogenization behavior in quartz of the hyalophane-bearing pegmatites (L+V+H → L+V → L) compared to quartz-carbonate veins (L+V+H → L+H → L), and Th (total homogenization) values range from 180 to 315°C with salinities of 30-40 wt.% eq. NaCl. In type 4 inclusions Th ranges from 90 to 290°C, but for specific samples and FIAs (fluid inclusion assemblages) there is a more limited spread (from 5 to 25°C). Salinities range from 8 to 24 wt.% eq. NaCl, and the inclusions have variable Na/(Na + Ca). Evaporate mound analysis shows average normalized (to 100%) cation contents of 48% Na, 24% Ca, 6% K, 5% Ba, 4% Mn, 2% Fe, 2% Mg, and 9% Sr for quartz-hosted inclusions in quartz-carbonate veins, and 61% Na, 32% Ca, and 7% K for quartz-hosted inclusions in hyalophane-bearing pegmatite dikes. The thermometric and chemical data suggest that evolution of the Hoidas Lake mineralization involved two fluid types with early entrapment of a carbonic fluid followed by introduction of a mixed Na-Ca-K-(Ba-Mn-Mg-Fe-Sr) aqueous fluid with variable salinities that was responsible for the late alteration of the mineralized veins. Furthermore, the inclusion data provide constraints on entrapment temperature (<310°C) and also indicate that the pressure was transient (0.5 to 2 kbars) based on the homogenization temperature data for the carbonic (type 1) and aqueous L-V-H (type 3) inclusions.

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“…Despite the earlier geological findings, the tectonic setting of the BHT remains elusive due to episodic overprinting events. The BHT was suggested to have strong chronological affinities to the Taltson magmatic zone based on the similar U‐Pb ages and partially overlapped Nd isotopic compositions preserved in the gneiss complex of the Taltson and subsurface rocks of the BHT (McNicoll et al, ). The magmatic rocks with ages ranging from 2324 to 1990 Ma potentially document several thermal tectonic events, among which a suite of young granitic rocks (1998–1990 Ga) was linked to the intrusion into the basement rocks of the BHT during its collision with the Chinchaga domain to the west (Ross & Eaton, ).…”

Section: Introductionmentioning

confidence: 99%

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

Chen

Hung

2018

Tectonics

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The Western Canada Sedimentary Basin marks a boundary zone between the Precambrian North American craton and the Phanerozoic Cordillera. Its crystalline basement has documented more than 3 billion years of evolution history of western Laurentia. Here we conduct a high‐resolution survey of the mantle P and S wave velocities using finite‐frequency tomography. Our models show pronounced eastward increases of 4% P and 6% S wave velocities beneath the foreland region, which define a sharp seismic Cordillera‐Craton boundary. In the cratonic region, distinctive high‐ (>2%) velocity anomalies representing depleted mantle lithospheres are well correlated with major Precambrian crustal domains. The largest lithosphere thickness contrast coincides with the Snowbird Tectonic Zone, where the Hearne province extends down to ~300 km, nearly 100 km deeper than the Proterozoic terranes in northern Alberta. In the latter region, a pronounced cylindrical negative velocity anomaly extends subvertically from 75 to ~300‐km depth, which potentially results from significant tectonothermal modifications during subduction and/or plume activities. At the basin scale, mantle velocities show no apparent correlations with surface heat flux, suggesting a minimum mantle contribution to the regional thermal variability. Furthermore, the long‐wavelength isostatic gravity correlates negatively with the velocities, which confirms that the melt extraction from Precambrian cratons is responsible for the formation of highly depleted mantle lithospheres. Moreover, our model reveals the increased concentrations of kimberlites and lamproites near the zones of high horizontal velocity gradients. The distinct spatial pattern may reflect either preferential formation or eruption of potentially diamondiferous rocks at lithospheric weak zones near the western margin of Laurentia.

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Taltson basement gneissic rocks: UPb and Nd isotopic constraints on the basement to the Paleoproterozoic Taltson magmatic zone, northeastern Alberta

Cited by 11 publications

References 0 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

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

Hydrothermal Evolution in the Hoidas Lake Vein-Type Ree Deposit, Saskatchewan, Canada: Constraints From Fluid Inclusion Microthermometry and Evaporate Mound Analysis

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

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Taltson basement gneissic rocks: UPb and Nd isotopic constraints on the basement to the Paleoproterozoic Taltson magmatic zone, northeastern Alberta

Cited by 11 publications

References 0 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

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

Hydrothermal Evolution in the Hoidas Lake Vein-Type Ree Deposit, Saskatchewan, Canada: Constraints From Fluid Inclusion Microthermometry and Evaporate Mound Analysis

A New Appraisal of Lithospheric Structures of the Cordillera‐Craton Boundary Region in Western Canada

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Taltson basement gneissic rocks: UPb and Nd isotopic constraints on the basement to the Paleoproterozoic Taltson magmatic zone, northeastern Alberta