Early proterozoic amer group, Beverly Lake map area, District of Keewatin

LeCheminant, A N; Jackson, M. J.; Galley, A G; Smith, S L; Donaldson, J A

doi:10.4095/119571

Cited by 6 publications

(7 citation statements)

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“…3). It is magnetically traced beneath the Thelon Basin and originates in an area of Pitz Formation north of Dubawnt Lake, where evidence of mafic-felsic mingling is preserved (LeCheminant et al, 1984). Narrow (approx.…”

Section: Mafic Dykesmentioning

confidence: 99%

The Kivalliq Igneous Suite: Anorogenic bimodal magmatism at 1.75Ga in the western Churchill Province, Canada

Peterson

Scott

LeCheminant

et al. 2015

Precambrian Research

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Section: Mafic Dykesmentioning

confidence: 99%

The Kivalliq Igneous Suite: Anorogenic bimodal magmatism at 1.75Ga in the western Churchill Province, Canada

Peterson

Scott

LeCheminant

et al. 2015

Precambrian Research

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“…SIS‐1 extends along most of the Sand Lake Horst (LeCheminant et al . ; Tella ), and SIS‐5 is the Judge Sissons pluton mapped and dated by Hadlari et al . ().…”

Section: Resultsmentioning

confidence: 99%

“…Their broad circular to elliptical magnetic anomalies attain amplitudes of 600 nT. SIS-1 extends along most of the Sand Lake Horst (LeCheminant et al 1984;Tella 1984), and SIS-5 is the Judge Sissons pluton mapped and dated by Hadlari et al (2004).…”

Section: Granitoid Intrusions Of the Snow Island Suitementioning

confidence: 94%

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Basement geology beneath the northeast Thelon Basin, Nunavut: insights from integrating new gravity, magnetic and geological data

Tschirhart

Jefferson

Morris

2016

Geophysical Prospecting

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Current models for unconformity‐associated uranium deposits predict fluid flow and ore deposition along reactivated faults in >1.76 Ga basement beneath Mesoproterozoic siliciclastic basins. In frontier regions such as the Thelon Basin in the Kivalliq region of Nunavut, little is known about the sub‐basin distribution of units and structures, making exploration targeting very tenuous. We constructed a geological map of the basement beneath the unconformity by extrapolating exposed features into the subsurface. The new map is constrained by detailed geological, geophysical, and rock property observations of outcrops adjacent to the basin and by aeromagnetic and gravity data over the geophysically transparent sedimentary basin. From rock property measurements, it is clear that the diverse magnetic and density characteristics of major rock packages provide quantitative three‐dimensional constraints. Gravity profiles forward modelled in four cross sections define broad synforms of the Amer Belt and Archean volcanic rocks that are consistent with the structural style outside the basin. Major lithotectonic entities beneath the unconformity include: supracrustal rocks of the Archean Woodburn Lake group and Marjorie Hills meta sedimentary gneiss and associated mixed granitoid and amphibolitic gneiss; the Amer Mylonite Zone and inferred mafic intrusions oriented parallel and sub‐parallel; other igneous intrusions of 2.6 Ga, 1.83 Ga, and 1.75 Ga vintage; and the <2.3 Ga to >1.84 Ga Amer Group. Four main brittle regional fault arrays (040°–060°, 075°–90°, 120°, and 150°) controlled development and preservation of the basin. The reactivated intersections of such faults along fertile basement units such as the Rumble assemblage, Marjorie Hills assemblage, Nueltin igneous rocks, and Pitz formation are the best targets for uranium exploration.

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“…Group comprises conglomerate and aeolian quartz arenite of the Amarook Formation, rhyolite and basalt (this study) and epiclastic rocks of the Pitz Formation, and covers a much wider area than the Baker Lake Group, extending west as far as the Beverly Lake ( Figure 2.1) and Akiliniq Hills area, with evidence of mixed mafic and felsic magmas (LeCheminant et al, 1984) and south transecting Dubawnt Lake (Peterson, 2006). The upper Dubawnt Supergroup rocks constitute the Barrensland Group, a succession of feldspathic sandstone, conglomerate and mudstone of the Thelon Formation, overlain by potassic mafic Kuungmi Formation lavas and the Lookout Point Formation dolostone.…”

Section: Dubawnt Supergroupmentioning

confidence: 89%

Paleoproterozoic (1.75 Ma) granitoid rocks andn uranium mineralization in the Baker Lake--Thelon Basin region, Nunavut

Scott¹

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The Nueltin suite is comprised of the Nueltin granite, Pitz Formation rhyolite and related basaltic dykes. Despite the extensive range of emplacement, petrographic and geochemical analysis show that all Nueltin suite components are feldspar-phyric, strongly potassic, Fe-rich and highly fractionated, with enrichment in rare earth elements, except for strongly depleted Eu. Overall, the Nueltin suite shares strong affinity with anorogenic (A-type) igneous rocks, with an interpreted petrogenetic model of crustal melting due to ponding of basaltic melt in the lower crust within an extensional regime. Fractionation is likely responsible for enrichment of U, Th and REE. Significant U mineralization, located in the Kiggavik area, is associated with the Lone Gull granite, a geologically complex granite. The presence of secondary uranium mineralization in association with Paleoproterozoic Nueltin igneous rocks implicate the suite as prospective for exploration.

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Early proterozoic amer group, Beverly Lake map area, District of Keewatin

Cited by 6 publications

References 0 publications

The Kivalliq Igneous Suite: Anorogenic bimodal magmatism at 1.75Ga in the western Churchill Province, Canada

The Kivalliq Igneous Suite: Anorogenic bimodal magmatism at 1.75Ga in the western Churchill Province, Canada

Basement geology beneath the northeast Thelon Basin, Nunavut: insights from integrating new gravity, magnetic and geological data

Paleoproterozoic (1.75 Ma) granitoid rocks andn uranium mineralization in the Baker Lake--Thelon Basin region, Nunavut

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