Lithofacies analysis of the Proterozoic Thelon Formation, Northwest Territories (including computer analysis of field data)

Cecile, M. P.

doi:10.22215/etd/1973-12414

Cited by 5 publications

(10 citation statements)

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“…The interpreted environments ranged from talus slope and braided fluvial at the base through to marine at the top. This is comparable to the stratigraphy and interpreted environments through the Athabasca Basin (Ramaekers 1981;Hoeve and Quirt 1984) and the Thelon Basin (Donaldson 1966;Cecile 1973). The age of the Hornby Bay Group is constrained by the unconformable relationship of basal Hornby Bay rocks upon rocks of the Wopmay Orogen, dated at 1850 Ma (Bowring and Van Schmus 1982), and by the age of 1660 f 8 Ma (Bowring and Ross 1985) from rhyolitic lavas of the Narakay volcanic complex, part of the upper Hornby Bay Group.…”

Section: Discussion From Figs 3 and 4 Is A Composite Of A Variety Ofsupporting

confidence: 79%

“…Cecile (1973) extended the subdivision of the Thelon Formation into four "facies". These facies were based on variations in mineralogy, clast lithologies, and sedimentary structures, all of which confirmed a fining-upward trend through the Thelon Formation.…”

Section: Stratigraphy Of the Thelon Basinmentioning

confidence: 99%

“…Multicoloured siltstone beds increase in proportion near the top of the section and are associated with stromatolitic and oolitic dolostone. The depositional environment for the upper Thelon is interpreted as ranging from continental fluvial at the base to nearshore marine at the top (Donaldson 1966;Cecile 1973).…”

Section: Stratigraphy Of the Thelon Basinmentioning

confidence: 99%

“…Thelon sediments and the underlying saprolite have undergone extensive diagenetic modification that involved the degradation of framework clasts, multiple generations of intraframework oxide, silicate, and phosphate cements (Cecile 1973;Chairenzelli 1983;Miller 1983;Jackson et al 1984). Diagenetic cements include hematite, quartz displaying a variety of textural forms, kandite-and illite-group clays, Can.…”

Section: Age Limits For the Thelon Basinmentioning

confidence: 99%

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U–Pb, Pb–Pb, and K–Ar isotopic study and petrography of uraniferous phosphate-bearing rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada

Miller¹,

Cumming²,

Krstić³

1989

Can. J. Earth Sci.

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The Thelon Formation, uppermost unit of the Dubawnt Group, overlies a regionally extensive paleoweathered zone developed on a wide range of lithochronological units including formations in the lower Dubawnt Group. Authigenic uraniferous phosphate minerals, fluorapatite and goyazite, cementing Thelon conglomerate–sandstone and filling fractures in the underlying paleoweathered zone, were dated in an attempt to better constrain the age of Thelon sedimentation and diagenesis. The oldest age, 1720 ± 6 Ma, derived from phosphate-cemented sediments, is interpreted as a minimum age for diagenesis and therefore brackets initial Thelon sedimentation between emplacement of fluorite-bearing granites at 1753 Ma and authigenic phosphate cementation at 1720 Ma. Additional ages of 1685 ± 4 and 1647 Ma are interpreted as remobilization or subsequent cementation events. K–Ar ages on illite, 1386 ± 37 and 1266 ± 31 Ma, from the paleoweathered zone and basal conglomerate, respectively, are significantly younger than ages derived from coexisting phosphate. These K–Ar ages record hydrothermal events that may be related to processes associated with unconformity-type uranium mineralization at approximately 1400–1300 Ma.Ages from the Thelon Basin permit geochronologic correlations with the Athabasca and Hornby basins, long correlated on the basis of similarities in sedimentation, stratigraphy, and tectonic setting.

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Section: Discussion From Figs 3 and 4 Is A Composite Of A Variety Ofsupporting

confidence: 79%

Section: Stratigraphy Of the Thelon Basinmentioning

confidence: 99%

Section: Stratigraphy Of the Thelon Basinmentioning

confidence: 99%

Section: Age Limits For the Thelon Basinmentioning

confidence: 99%

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U–Pb, Pb–Pb, and K–Ar isotopic study and petrography of uraniferous phosphate-bearing rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada

Miller¹,

Cumming²,

Krstić³

1989

Can. J. Earth Sci.

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“…1). These are generally fiat-lying sequences and have a present areal extent of approximately 85,000 km 2 in each basin and a preserved thickness of up to 1.3 and 1.5 km, respectively, in the two basins (Cecile, 1973;Overton, 1979;Ramaekers, 1981). The basal conglomerates and sandstones in (both) basins were deposited on a deeply weathered surface of low relief.…”

mentioning

confidence: 96%

Unconformity-related U-Au mineralization in the middle Proterozoic Thelon Sandstone, Boomerang Lake Prospect, Northwest Territories, Canada

Davidson¹,

Gandhi

1989

Economic Geology

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Basin evolution, diagenesis and uranium mineralization in the Paleoproterozic Thelon Basin, Nunavut, Canada

et al. 2010

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The Paleoproterozoic (Statherian) Thelon Basin is located in the Churchill Province of the Canadian Shield, formed following the Trans‐Hudson Orogeny. Basin formation followed an interval of felsic volcanism and weathering of underlying bedrock. The diagenetic evolution of the Thelon lasted about one billion years and was punctuated by fluid movement influenced by tectonic events. Early quartz cements formed in well‐sorted, quartz‐rich facies during diagenetic stage 1; fluids in which these overgrowths formed had δ18O values near 0‰ (Vienna Standard Mean Ocean Water). Uranium‐rich apatite cement (P1) also formed during diagenetic stage 1 indicating that oxygenated, uranium‐bearing pore water was present in the basin early in its diagenetic history. Syntaxial quartz cement (Q1) formed in water with δ18O from −4 to −0.8‰ in diagenetic stage 2. Diagenetic stage 3 occurred when the Thelon Formation was at ca. 5 km depth, and was marked by extensive illitization, alteration of detrital grains, and uranium mineralization. Basin‐wide, illite crystallized at ∼200 °C by fluids with δ18O values of 5–9‰ and δD values of −60 to −31‰, consistent with evolved basinal brines. Tectonism caused by the accretion of Nena at ca. 1600 Ma may have provided the mechanism for brine movement during deep burial. Diagenetic stage 4 is associated with fracturing and emplacement of mafic dikes at ca. 1300 Ma, quartz cement (Q3) in fractures and vugs, further illitization, and recrystallization of uraninite (U2). Q3 cements have fluid inclusions that suggest variable salinities, δ18O values of 1.5–9‰, and δD values of −97 to −83‰ for stage 4 brines. K‐feldspar and Mg‐chlorite formed during diagenetic stage 5 at ca. 1000 Ma in upper stratigraphic sequences, and in the west. These phases precipitated from low‐temperature, isotopically distinct fluids. Their distribution indicates that the basin hydrostratigraphy remained partitioned for >600 Ma.

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Lithofacies analysis of the Proterozoic Thelon Formation, Northwest Territories (including computer analysis of field data)

Cited by 5 publications

References 0 publications

U–Pb, Pb–Pb, and K–Ar isotopic study and petrography of uraniferous phosphate-bearing rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada

U–Pb, Pb–Pb, and K–Ar isotopic study and petrography of uraniferous phosphate-bearing rocks in the Thelon Formation, Dubawnt Group, Northwest Territories, Canada

Unconformity-related U-Au mineralization in the middle Proterozoic Thelon Sandstone, Boomerang Lake Prospect, Northwest Territories, Canada

Basin evolution, diagenesis and uranium mineralization in the Paleoproterozic Thelon Basin, Nunavut, Canada

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