Tectonic history of the North American shield recorded in uranium deposits in the Beaverlodge area, northern Saskatchewan, Canada

Dieng, S.; Kyser, Kurt; Godin, Laurent

doi:10.1016/j.precamres.2012.09.011

Cited by 15 publications

(13 citation statements)

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“…The most comprehensive geochronolgical studies on uraninite-bearing ore deposits have been completed in the Athabasca Basin and adjacent areas in Canada [1,4,45,46], as well as in the McArthur and Mt. Isa basins in Australia [3,[47][48][49].…”

Section: Resultsmentioning

confidence: 99%

“…This peculiarity of uraninite complicates or may even exclude direct determination of the crystallization age, but, on the other hand, also opens the opportunity to evaluate the timing of processes leading to modification of the primary mineralization. This latter is especially interesting in Precambrian terranes where uraninite-bearing ores frequently show mineralogical-textural evidences for overprinting by metamorphism, deformation and/or fluid exchange [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane

et al. 2017

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Abstract:The Peräpohja belt comprises a greenschist to amphibolite facies; multiply-folded supracrustal sequence of quartzites; mafic volcanics; carbonate rocks; black shales; mica schists and greywackes deposited from ca. 2.44 Ga to 1.92 Ga; during protracted rifting of the Archaean basement. Metamorphism and multiple folding of the basin fill occurred during the Svecofennian orogeny (1.92-1.80 Ga). The Rompas Au-U mineralization is hosted within deformed and metamorphosed calcsilicate veins in mafic volcanics. Textural evidence suggests that deposition and periods of uraninite re-mobilization were followed by localized hydrocarbon-bearing fluid flow which produced pyrobitumen crusts around grains of uraninite. Gold precipitated during the latest hydrothermal event at around 1.75 Ga. In situ U-Pb dating of uraninite by laser ablation inductively coupled mass spectroscopy (LA-ICP-MS), and Re-Os dating of molybdenite, indicate that primary hydrothermal uranium mineralization forms two age clusters; about 2.03-2.01 and 1.95-1.94 Ga. Resetting of the U-Pb system and precipitation of new generations of uraninite are associated with major deformation and metamorphic stages of the Svecofennian orogeny at 1.91-1.89 Ga, 1.85 Ga, and 1.80 Ga. Gold deposition was synchronous with the emplacement of the 1.75-1.78 Ga late/post-orogenic granitoids. The gold-producing hydrothermal event is also recorded by Re-Os dating of molybdenite from the gold-bearing Mg-metasomatized metasedimentary and metavolcanic units at the Palokas prospect; a few kilometres from Rompas. Results of this study confirm that some domains in the structure of uraninite may preserve the original crystallization age, despite an overprinting amphibolite facies metamorphic and other hydrothermal events. The study supports the utility of in situ U-Pb dating of uraninite and the ability of Re-Os dating to assist in sorting out different hydrothermal events in areas with complex tectonic; magmatic and metamorphic histories.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochronology of Hydrothermal Processes Leading to the Formation of the Au–U Mineralization at the Rompas Prospect, Peräpohja Belt, Northern Finland: Application of Paired U–Pb Dating of Uraninite and Re–Os Dating of Molybdenite to the Identification of Multiple Hydrothermal Events in a Metamorphic Terrane

et al. 2017

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“…He interpreted these events to be related to major thermotectonic events. Dieng et al (2013) used paragenetic relationships and U-Pb geochronology of uraninite to identify six distinct styles of uranium mineralization, based on the oldest Pb-Pb ages of the uraninite and timing of structural events (Fig. 5).…”

Section: Uranium Mineralization Of the Beaverlodge Area: Previous Invmentioning

confidence: 99%

“…2.33-2.29 Ga North Shore pluton suite (Hartlaub et al, 2007), including the 2321 ± 3 Ma Gunnar granite (Fig. 2) that hosts a major uranium deposit Ashton, 2010;Dieng et al, 2013); (3) Paleoproterozoic siliciclastic red-bed sedimentary rocks and associated alkaline volcanic rocks at ca. 1820 Ma that comprise the Martin Lake basin that unconformably overlies the granitic basement and Murmac Bay Group (Langford, 1981;Hendry, 1983;Mazimhaka and Hendry, 1984;Morelli et al, 2009); and (4) late Paleoproterozoic sedimentary rocks of the Athabasca Group at ca.…”

Section: Introductionmentioning

confidence: 99%

Genesis of Multifarious Uranium Mineralization in the Beaverlodge Area, Northern Saskatchewan, Canada

2014

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The Beaverlodge area in Saskatchewan, Canada, hosts numerous fault-controlled uranium deposits that are geochemically and structurally complex because of multiple deformation events. Field, petrographic, and geochemical data indicate there are six distinct styles of uraninite mineralization, with five temporally distinct mineralization events. The earliest two styles of mineralization are hosted in cataclasite and veins that formed at ca. 2.29 Ga from 300°C fluids derived from retrograde metamorphic processes during late stages of the early Paleoproterozoic Arrowsmith orogen. The second style of mineralization is restricted to the albitized granite of the Gunnar deposit and formed between ca. 2.3 and 1.9 Ga from reducing magmatic-hydrothermal fluids near 300°C. However, uranium associated with this metasomatic style of mineralization is overprinted by the more significant breccia-vein and minor volcanic-type mineralization, thus the Gunnar deposit contains three styles of mineralization. Reactivation of major fault zones resulted in breccia-type mineralization, the dominant mineralizing event, at ca. 1.85 Ga, from Ca-Na-F-rich fluids at about 330°C during the postpeak Thelon-Taltson orogen and early stages of the Trans-Hudson orogen. Inversion followed by subsidence resulted in formation of the Martin Lake basin, a successor basin filled with ca. 5 km of arkose, conglomerates, siltstone, and alkaline mafic flows and sills that formed during back-arc extension following peak Trans-Hudson orogeny. Volcanic-style mineralization at 1.82 Ga. resulted from late exsolution of magmatic fluids from the alkaline mafic dikes. Overlying the Martin Lake basin are outliers of the Athabasca Formation associated with the last stage of uranium mineralization, at ca. 1.62 Ga, from oxidizing basinal brines near 230°C. Subsequent erosion of the Athabasca and Martin Lake basin rocks and weathering of the deposits resulted in secondary uranium minerals and late veins.Multiple stages of deformation and fluid overprinting suggest that uranium mineralization record progressively higher levels in the crust. Each successive event overprinted to varying degrees the previous events. Although the Beaverlodge area represents several distinct mineralizing events, the major event is the brecciatype that occurred at 1.85 Ga. The other styles of mineralization are minor, and their presence complicates both exploration and our understanding of ore deposit genesis in the area.

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“…For example, in the McArthur River deposit, the major fault is a northeast-trending, southeast dipping, reverse fault (McGill 1999;Derome et al 2005); whereas in the Dragon Lake area, the major fault is a left-lateral strike-slips structure (Hoeve and Sibbald 1978), and in the Rabbit Lake deposit, the fault is a thrust type with a low dip angle (Hoeve and Sibbald 1978). Additionally, faults may become more permeable after reactivation (Lorilleux et al 2003;Dieng et al 2013), which is a common process in the Athabasca Basin.…”

Section: Introductionmentioning

confidence: 99%

Rôle des facteurs hydrodynamiques dans le contrôle de la formation et de l’emplacement des dépôts d’uranium associés à des discordances: aperçus issus de la modélisation de transport réactif

Aghbelagh

Yang

2016

Hydrogeol J

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Tectonic history of the North American shield recorded in uranium deposits in the Beaverlodge area, northern Saskatchewan, Canada

Cited by 15 publications

References 73 publications

Genesis of Multifarious Uranium Mineralization in the Beaverlodge Area, Northern Saskatchewan, Canada

Rôle des facteurs hydrodynamiques dans le contrôle de la formation et de l’emplacement des dépôts d’uranium associés à des discordances: aperçus issus de la modélisation de transport réactif

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