Nd isotope and geochemical constraints on the depositional setting of Paleoproterozoic metasedimentary rocks along the margin of the Archean Hearne craton, Saskatchewan, Canada

Tran, Hai T.; Ansdell, Kevin M.; Bethune, Kathryn M.; Watters, Brian R.; Ashton, K

doi:10.1016/s0301-9268(03)00012-3

Cited by 59 publications

(38 citation statements)

References 65 publications

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“…However, the final geometry also depends on the initial geometry of the Hearne margin before the D1 convergence. Tran et al (2003Tran et al ( , 2008 suggested that the Wollaston Group sediments were deposited on the Archean Hearne Craton in a passive margin setting that evolved to a back-arc basin between ca. 2.1 Ga (rifting) and 1.92 Ga (formation of the Rottenstone continental arc that now belongs to the Reindeer Zone).…”

Section: Geodynamic Significance Of the Wollaston-mudjatik Transitionmentioning

confidence: 99%

“…The geology of the Wollaston Group and its underlying Archean basement has been extensively studied over the last 20 years Madore 1994, 2002;Annesley et al 1997aAnnesley et al , 1997bAnnesley et al , 2001Annesley et al , 2005Annesley 1997a, 1997b;Madore et al 1999b;Tran 2001;Tran et al 2003Tran et al , 2008Harper et al 2005aHarper et al , 2005bHarper et al , 2005cHarper et al , 2007aHarper et al , 2007bHarper et al , 2007cCard et al 2006aCard et al , 2006bCard et al , 2006cYeo and Delaney 2007;McKechnie et al 2012aMcKechnie et al , 2012band references therein).…”

Section: Introductionmentioning

confidence: 99%

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Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

et al. 2016

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Abstract:The Paleoproterozoic tectono-metamorphic evolution of the pre-Athabasca basement (ϳ1.7 Ga) within the WollastonMudjatik Transition Zone (WMTZ) (Saskatchewan, Canada) has been characterized using both exposed basement and drill cores from the Wolly-McClean exploration drilling project. The finite ductile strain pattern of the WMTZ results from the superposition of two tectono-metamorphic events M1-D1 and M2-D2. M1-D1 is associated with the development of a gently dipping foliation striking N90°-N100°and a southward decrease in peak pressures from up to 10 kbar (1 kbar = 100 MPa) in the Cochrane River area down to 6 kbar in the Wolly-McClean exploration drilling project. The M2-D2 event is responsible for the main northeasterly trend of the WMTZ that developed in a sinistral transpressional tectonic regime during the final oblique collision of the Trans-Hudson Orogeny. Thermobarometric estimations on M2-D2 assemblages show that the studied area was reequilibrated at about 4-5 kbar and 750-825°C. The basement has thus been affected by a differential isothermal decompression event between D1 and D2 that allowed the juxtaposition of the deepest northeastern domains and the Wolly-McClean exploration drilling project, at the same structural level. These results suggest that the basement exposed to the northeast of the Athabasca Basin is not an analog of the basement located beneath the eastern Athabasca Basin where uranium-enriched granitic pegmatites and granites are known. We also suggest that uranium-enriched melts produced during the early M1-D1 stage of partial melting in the deep crust were transferred to the midcrust, owing to D2 shear zones, where they have differentiated to produce uranium-bearing pegmatites.Résumé : L'évolution tectono-métamorphique Paléoprotérozoique du socle pré-Athabasca (ϳ1.7 Ga) de la Zone de Transition Mudjatik-Wollaston (ZTMW) (Saskatchewan) a été définie à partir du socle affleurant et des forages du projet Wolly-McClean. Le champ de déformation finie ductile résulte de la superposition de deux évènements tectono-métamorphique M1-D1 et M2-D2. M1-D1 est associé au développement d'une foliation peu inclinée orientée N90°-N100°et à un pic de pression décroissant vers le sud avec plus de 10 kbar (1 kbar = 100 MPa) à la rivière Cochrane, jusqu'à 6 kbar dans la zone de forage du projet Wolly-McClean. L'évènement M2-D2 est responsable de la structuration majeure Nord-Est de la ZTMW qui s'est développée dans un régime transpressif senestre au cours de la phase finale de la collision oblique Trans-Hudsonienne. Les estimations thermobaromé-triques sur les assemblages M2-D2 mettent en évidence un rééquilibrage à 4-5 kbar et 750-825°C. Le socle a donc été affecté entre D1 et D2 par un épisode de décompression isotherme, ramenant au même niveau structural, la partie nord-est la plus profonde de la zone d'étude et la zone de forage Wolly-McClean. Ces résultats suggèrent que le socle affleurant au Nord-Est du bassin de l'Athabasca n'est pas l'analogue du socle situé sous le bassin là où les...

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Section: Geodynamic Significance Of the Wollaston-mudjatik Transitionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

et al. 2016

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“…The upper part of the succession includes conglomerates, immature arkosic rocks, and calc-silicate rocks and is thought to represent subsequent infilling of a foreland basin. Neodymium isotopic data of Tran et al (2003) showed that the Wollaston Group detritus was likely derived from active continental margin magmatic sources, as supported by the presence of a significant proportion of 1920-1880 Ma old zircons (Tran et al 2008). There are three main zircon populations, including: 1) older than 2400 Ma grains that represent detritus shed from the neighboring Hearne Craton; 2) ~ 2100 Ma components thought to represent reworking of syn-rift volcanic rocks, and 3) 1920-1880 Ma detritus derived from advancing volcanic arc terrains of the western Churchill Province (Ansdell et al 2000;Hamilton and Delaney 2000;Tran 2001;Yeo and Delaney 2007;Tran et al 2008).…”

Section: Regional Geologymentioning

confidence: 94%

“…The Wollaston Group metasediments overlie Archean granites that range between 2650 Ma and 2500 Ma (U-Pb zircon TIMS ages; Ray and Wanless 1980;Krogh and Clark 1987;Annesley et al 1992Annesley et al , 2005Hamilton and Delaney 2000;Rayner et al 2005). The cover sequence was described as a Paleoproterozoic syn-rift passive margin and foreland metasedimentary basin (Ansdell et al 2000;Tran et al 2003Tran et al , 2008 that is divided into Lower and Upper subgroups, separated by a regional unconformity (Tran 2001). The lower succession includes a basal, graphitic pelitic unit overlain by, and in part interleaved with, arkose, conglomerate, quartzite, and calcareous sedimentary rocks.…”

Section: Regional Geologymentioning

confidence: 99%

Geology and evolution of pegmatite-hosted U-Th ± REE-Y-Nb Mineralization, Kulyk, Eagle, and Karin Lakes region, Wollaston Domain, northern Saskatchewan, Canada: examples of the dual role of extreme fractionation and hybridization processes

McKeough¹,

Lentz²,

McFarlane³

et al. 2013

J. Geosci.

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In northern Saskatchewan, granitic pegmatites intruded Early Paleoproterozoic Wollaston Group metasedimentary rocks and interfolded granitoids that unconformably overlie Late Archean gneisses, all of which have been subjected to deformation during the protracted 1.86 to 1.77 Ga Trans-Hudson Orogeny. The U-Th ± REE-Y-Nb pegmatite intrusions and fracture-controlled U mineralization characterize the occurrences at Kulyk Lake, Eagle Lake, and Karin Lake properties in the Wollaston Domain. The pegmatites are moderately to highly evolved, ranging from mineralogically simple to complex types. These are rare-earth element class, NYF pegmatites (Nb-Y-F), and are interpreted to have formed in a late syn-to post-collisional tectonic setting. The complex-type pegmatites are hybridized, due to metasomatic interaction with the host rocks and therefore are locally crudely zoned. Saturation of U-Th ± REE-Y-Nb occurred at the margins (predominately the border and wall zones) of the hybridized pegmatites. Partial melts were generated at depth, and then coalesced as they intruded to higher structural levels during exhumation of this orogen. This agrees with U-Pb geochronology of these granitic pegmatites, which constrains them between peak-and late-metamorphic events of the Trans-Hudson Orogeny. The age constraints and relatively high-T partial melting conditions (~750 °C) confine the pegmatite melt-forming conditions to an early deformational event (1835-1805 Ma) that was overprinted by high-T retrograde metamorphism at c. 1770 Ma. Field relationships, textures and geochemical variations provide strong evidence that the U, Th, REE ± Y-Nb phases in the studied pegmatites were progressively enriched through extreme fractionation effects of which are evident throughout multiple pegmatite injections. In addition, volatiles and other fluxing components further enriched U, Th, REE ± Y-Nb during complex hybridization reactions between pegmatite melt and wallrock, up to the final stages of pegmatite emplacement.

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“…McLennan et al 1993;McLennan et al 1995;Yamashita et al 2000;Goodge et al 2002;Lahtinen et al 2002;Tran et al 2003;González-Álvarez et al 2006;Payne et al 2006;Barovich and Hand 2008;Tran et al 2008). U-Pb geochronology of zircon-bearing sources provides an age spectrum and maximum depositional age of the sediment.…”

Section: Regional Chemostratigraphymentioning

confidence: 99%

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

2010

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The development of a regional stratigraphy in Palaeoproterozoic basins within the Tanami region, Northern Australia has been hindered by the difficulty of discriminating sedimentary units and facies across this isolated and poorly exposed basin. A regional stratigraphy is important as it provides constraints on sedimentary basin evolution and assists in gold exploration. Gold is known to be more concentrated in certain rock formations. Based on Nd isotopes and whole-rock geochemistry, five main sedimentary events have been identified in the Tanami region. Some sedimentary units were derived from homogeneous local sources whereas others contain evidence of a well-mixed fine-grained remote provenance. Within the basins, major gold-bearing lithologies are characterised by mafic source indicators: (1) high Cr/Th ratios; (2) low Th/Sc ratios; (3) low (La/Yb) PAAS ratios relative to Post-Archaean Average Shale (Taylor and McLennan 1985); (4) Eu anomalies equal to ~1 and, (5) distinctive ranges in initial  Nd values. Potential future exploration target areas have been identified in the Tanami region at the Cashel and Sunline prospects using these geochemical parameters.

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Nd isotope and geochemical constraints on the depositional setting of Paleoproterozoic metasedimentary rocks along the margin of the Archean Hearne craton, Saskatchewan, Canada

Cited by 59 publications

References 65 publications

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

Geology and evolution of pegmatite-hosted U-Th ± REE-Y-Nb Mineralization, Kulyk, Eagle, and Karin Lakes region, Wollaston Domain, northern Saskatchewan, Canada: examples of the dual role of extreme fractionation and hybridization processes

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

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Nd isotope and geochemical constraints on the depositional setting of Paleoproterozoic metasedimentary rocks along the margin of the Archean Hearne craton, Saskatchewan, Canada

Cited by 59 publications

References 65 publications

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

Tectono-metamorphic evolution of the pre-Athabasca basement within the Wollaston–Mudjatik Transition Zone, Saskatchewan

Geology and evolution of pegmatite-hosted U-Th &plusmn; REE-Y-Nb Mineralization, Kulyk, Eagle, and Karin Lakes region, Wollaston Domain, northern Saskatchewan, Canada: examples of the dual role of extreme fractionation and hybridization processes

Typecasting prospective Au-bearing sedimentary lithologies using sedimentary geochemistry and Nd isotopes in poorly exposed Proterozoic basins of the Tanami region, Northern Australia

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Geology and evolution of pegmatite-hosted U-Th ± REE-Y-Nb Mineralization, Kulyk, Eagle, and Karin Lakes region, Wollaston Domain, northern Saskatchewan, Canada: examples of the dual role of extreme fractionation and hybridization processes