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"https://www.academia.edu/login?post_login_redirect_url=https%3A%2F%2Fwww.academia.edu%2F75141482%2FFormation_and_Evolution_of_the_Centennial_Unconformity_Related_Uranium_Deposit_in_the_South_Central_Athabasca_Basin_Canada%3Fshow_translation%3Dtrue"; window.loswp.previewableAttachments = [{"id":83610845,"identifier":"Attachment_83610845","shouldShowBulkDownload":false}]; window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":75141482,"created_at":"2022-04-01T04:06:22.230-07:00","from_world_paper_id":200215496,"updated_at":"2024-11-25T00:25:24.763-08:00","_data":{"publisher":"Society of Economic Geologists","grobid_abstract":"The Centennial U deposit is situated in the south-central Athabasca Basin (Canada) and straddles the unconformity between early Paleoproterozoic to Archean metasedimentary and metavolcanic rocks and granitoids, and the clastic sediments of the Paleoproterozoic Athabasca Group. Although it has most characteristics of an unconformity-related uranium deposit, the Centennial deposit is atypical in that it is not directly associated with an electromagnetic conductor (there is a paucity of graphite in the basement) or with a major reverse fault zone; it is distal from a major fluid conduit (ca. 300 to 400 m from the Dufferin Lake Fault), has low Ni, Cu, Co, Zn, and Pb contents, and contains an unusually large amount (up to 5%) of secondary uranyl minerals. Additionally, a network of diabase dikes and sills is observed at Centennial, seemingly intruding the main U mineralization of massive uraninite, based on the relatively sharp contacts between the diabase dike and the high-grade U mineralization. The pre-U alteration assemblage at Centennial includes kaolinite, illite, and sudoite, which have been formed by fluids with isotopic and chemical compositions that are comparable with those from other sandstone-hosted unconformity-type U deposits in the Athabasca Basin. Pre-U illite-related fluids have δ 18 O of ca. 3‰ and δD of ca.-40‰, whereas pre-U chlorite-related fluids have δ 18 O between 1.7 and 4.3‰ and δD between-18 and 1‰. Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U/Pb dating of the various U phases indicates that initial mineralization, represented by disseminated uraninite found directly to the north-northeast of the Centennial deposit, occurred at ca. 1.6 Ga. The main U mineralization, represented by massive and strongly altered uraninite, followed at an unknown time. A minor (\u003c5%) unaltered uraninite formed from the local remobilization of the main massive uraninite at ca. 380 Ma. The main uranyl mineral, uranophane, formed last, at ca. 2 Ma. The recurrence of local U remobilization might have been facilitated by the persisting high permeability of the sandstones in the area due to the nearby Dufferin Lake Fault and to the emplacement of the diabase dikes. The usefulness of Pb isotopes for exploration is demonstrated at the Centennial deposit, with strongly radiogenic Pb isotope signatures close to the deposit and a common Pb signature observed at a distance of a few km from the deposit.","publication_date":"2012,,","publication_name":"Economic Geology","grobid_abstract_attachment_id":"83610845"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Formation and Evolution of the Centennial Unconformity-Related Uranium Deposit in the South-Central Athabasca Basin, Canada","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [4015673]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId 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src="https://0.academia-photos.com/4015673/4992610/5731974/s65_paul.alexandre.jpg" />Paul Alexandre</a></div><div class="ds-work-card--detail"><p class="ds-work-card--detail ds2-5-body-sm">2012, Economic Geology</p><div class="ds-work-card--work-metadata"><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">visibility</span><p class="ds2-5-body-sm" id="work-metadata-view-count">…</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">description</span><p class="ds2-5-body-sm">16 pages</p></div><div class="ds-work-card--work-metadata__stat"><span class="material-symbols-outlined" style="font-size: 20px" translate="no">link</span><p class="ds2-5-body-sm">1 file</p></div></div><script>(async () => { const workId = 75141482; const worksViewsPath = "/v0/works/views?subdomain_param=api&work_ids%5B%5D=75141482"; const getWorkViews = async 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The present paper gives the results of laser step heating 40Ar/39Ar dating of metamorphic host-rock minerals, pre-ore and syn-ore alteration clay minerals, and laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) U/Pb dating of uraninite from a number of basement- and sediment-hosted unconformity-related deposits in the Athabasca Basin, Canada. Post-peak metamorphic cooling during the Trans-Hudson Orogen of rocks from the basement occurred at ca 1,750 Ma and gives a maximum age for the formation of the overlying Athabasca Basin. Pre-ore alteration occurred simultaneously in both basement- and sandstone-hosted mineralizations at ca 1,675 Ma, as indicated by the 40Ar/39Ar dating of preore alteration illite and chlorite. The uranium mineralization age is ca 1,590 Ma, given by LA-ICP-MS U/Pb dating of uraninite and 40Ar/39Ar dating of syn-ore illite, and is the same throughout the basin and in both basement- and sandstone-hosted deposits. The mineralization event, older than previously proposed, as well as several fluid circulation events that subsequently affected all minerals studied probably correspond to far-field, continent-wide tectonic events such as the metamorphic events in Wyoming and the Mazatzal Orogeny (ca 1.6 to 1.5 Ga), the Berthoud Orogeny (ca 1.4 Ga), the emplacement of the McKenzie mafic dyke swarms (ca 1.27 Ga), the Grenville Orogeny (ca 1.15 to 1 Ga), and the assemblage and break-up of Rodinia (ca 1 to 0.85 Ga). The results of the present work underline the importance of basin evolution between ca 1.75 Ga (basin formation) and ca 1.59 Ga (ore deposition) for understanding the conditions necessary for the formation of unconformity-type uranium deposits.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Geochronology of the Paleoproterozoic basement-hosted unconformity-type uranium deposits in Northern Saskatchewan, Canada","attachmentId":118311305,"attachmentType":"pdf","work_url":"https://www.academia.edu/114650423/Geochronology_of_the_Paleoproterozoic_basement_hosted_unconformity_type_uranium_deposits_in_Northern_Saskatchewan_Canada","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a 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class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="46865802" href="https://independent.academia.edu/RodneyCEwing">Rodney C Ewing</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Applied Geochemistry, 1997</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Mineral chemistry and oxygen isotopic analyses of uraninite, pitchblende and uranium alteration minerals from the Cigar Lake deposit, Saskatchewan, Canada","attachmentId":45517406,"attachmentType":"pdf","work_url":"https://www.academia.edu/25205673/Mineral_chemistry_and_oxygen_isotopic_analyses_of_uraninite_pitchblende_and_uranium_alteration_minerals_from_the_Cigar_Lake_deposit_Saskatchewan_Canada","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" 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deposits in the Athabasca Basin, Saskatchewan, Canada and their integration in the evolution of the basin</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4015673" href="https://brandonu.academia.edu/PaulAlexandre">Paul Alexandre</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Mineralium Deposita, 2009</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Geochronology of unconformity-related uranium deposits in the Athabasca Basin, Saskatchewan, Canada and their integration in the evolution of the basin","attachmentId":31207025,"attachmentType":"pdf","work_url":"https://www.academia.edu/3441427/Geochronology_of_unconformity_related_uranium_deposits_in_the_Athabasca_Basin_Saskatchewan_Canada_and_their_integration_in_the_evolution_of_the_basin","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/3441427/Geochronology_of_unconformity_related_uranium_deposits_in_the_Athabasca_Basin_Saskatchewan_Canada_and_their_integration_in_the_evolution_of_the_basin"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="6" data-entity-id="7309793" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/7309793/Basin_evolution_diagenesis_and_uranium_mineralization_in_the_PaleoproterozicThelon_Basin_Nunavut_Canada">Basin evolution, diagenesis and uranium mineralization in the PaleoproterozicThelon Basin, Nunavut, Canada</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="12813960" href="https://uwosh.academia.edu/EricHiatt">Eric E Hiatt</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="23971819" href="https://queensu.academia.edu/SarahPalmer">Sarah Palmer</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Basin evolution, diagenesis and uranium mineralization in the PaleoproterozicThelon Basin, Nunavut, Canada","attachmentId":33916492,"attachmentType":"pdf","work_url":"https://www.academia.edu/7309793/Basin_evolution_diagenesis_and_uranium_mineralization_in_the_PaleoproterozicThelon_Basin_Nunavut_Canada","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/7309793/Basin_evolution_diagenesis_and_uranium_mineralization_in_the_PaleoproterozicThelon_Basin_Nunavut_Canada"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="7" data-entity-id="18744557" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/18744557/Metal_rich_fluid_inclusions_provide_new_insights_into_unconformity_related_U_deposits_Athabasca_Basin_and_Basement_Canada_">Metal-rich fluid inclusions provide new insights into unconformity-related U deposits (Athabasca Basin and Basement, Canada)</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32394895" href="https://independent.academia.edu/DavidBanks9">David Banks</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="36621028" href="https://univ-lorraine.academia.edu/AntoninRichard">Antonin Richard</a></div><p class="ds-related-work--abstract ds2-5-body-sm">The Paleoproterozoic Athabasca Basin (Canada) hosts numerous giant unconformity-related uranium deposits. The scope of this study is to establish the pressure, temperature, and composition (P-T-X conditions) of the brines that circulated at the base of the Athabasca Basin and in its crystalline basement before, during and after UO2 deposition. These brines are commonly sampled as fluid inclusions in quartz- and dolomite-cementing veins and breccias associated with alteration and U mineralization. Microthermometry and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) data from five deposits (Rabbit Lake, P-Patch, Eagle Point, Millennium, and Shea Creek) complement previously published data for the McArthur River deposit. In all of the deposits investigated, fluid inclusion salinity is between 25 and 40 wt.% NaCl equiv., with compositions displaying a continuum between a “NaCl-rich brine” end-member (Cl > Na > Ca > Mg > K) and a “CaCl2-rich brine” end-member (Cl > Ca ≈ Mg > Na > K). The CaCl2-rich brine has the highest salinity and shows evidence for halite saturation at the time of trapping. The continuum of compositions between the NaCl-rich brine and the CaCl2-rich brine end-members combined with P-T reconstructions suggest anisothermal mixing of the two brines (NaCl-rich brine, 180 ± 30 °C and 800 ± 400 bars; CaCl2-rich brine, 120 ± 30 °C and 600 ± 300 bars) that occurred under fluctuating pressure conditions (hydrostatic to supra-hydrostatic). However, because the two brines were U bearing and therefore oxidized, brine mixing was probably not the driving force for UO2 deposition. Several scenarios are put forward to account for the Cl-Na-Ca-Mg-K composition of the brines, involving combinations of seawater evaporation, halite dissolution, mixing with a halite-dissolution brine, Mg/Ca exchange by dolomitization, Na/Ca exchange by albitization of plagioclase, Na/K exchange by albitization of K-feldspar, and Mg loss by Mg-rich alteration. Finally, the metal concentrations in the NaCl-rich and CaCl2-rich brines are among the highest recorded compared to present-day sedimentary formation waters and fluid inclusions from basin-hosted base metal deposits (up to 600 ppm U, 3000 ppm Mn, 4000 ppm Zn, 6000 ppm Cu, 8000 ppm Pb, and 10,000 ppm Fe). The CaCl2-rich brine carries up to one order of magnitude more metal than the NaCl-rich brine. Though the exact origin of major cations and metals of the two brines remains uncertain, their contrasting compositions indicate that the two brines had distinct flow paths and fluid-rock interactions. Large-scale circulation of the brines in the Athabasca Basin and Basement was therefore a key parameter for metal mobility (including U) and formation of unconformity-related U deposits.</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Metal-rich fluid inclusions provide new insights into unconformity-related U deposits (Athabasca Basin and Basement, Canada)","attachmentId":40231865,"attachmentType":"pdf","work_url":"https://www.academia.edu/18744557/Metal_rich_fluid_inclusions_provide_new_insights_into_unconformity_related_U_deposits_Athabasca_Basin_and_Basement_Canada_","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/18744557/Metal_rich_fluid_inclusions_provide_new_insights_into_unconformity_related_U_deposits_Athabasca_Basin_and_Basement_Canada_"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="8" data-entity-id="71210260" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/71210260/Uranium_rich_diagenetic_fluids_provide_the_key_to_unconformity_related_uranium_mineralization_in_the_Athabasca_Basin">Uranium-rich diagenetic fluids provide the key to unconformity-related uranium mineralization in the Athabasca Basin</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33095830" href="https://independent.academia.edu/AnthonyWilliamsjones">Anthony Williams-jones</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Scientific Reports</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Uranium-rich diagenetic fluids provide the key to unconformity-related uranium mineralization in the Athabasca Basin","attachmentId":80654706,"attachmentType":"pdf","work_url":"https://www.academia.edu/71210260/Uranium_rich_diagenetic_fluids_provide_the_key_to_unconformity_related_uranium_mineralization_in_the_Athabasca_Basin","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/71210260/Uranium_rich_diagenetic_fluids_provide_the_key_to_unconformity_related_uranium_mineralization_in_the_Athabasca_Basin"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="9" data-entity-id="30589502" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/30589502/Origin_of_U_mineralizing_brines_in_the_Athabasca_Basin_Canada">Origin of U-mineralizing brines in the Athabasca Basin, Canada</a><div class="ds-related-work--metadata"><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32394895" href="https://independent.academia.edu/DavidBanks9">David Banks</a><span>, </span><a class="js-wsj-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="38936760" href="https://unibe-ch2.academia.edu/ThomasPettke">Thomas Pettke</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2009</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Origin of U-mineralizing brines in the Athabasca Basin, Canada","attachmentId":51030789,"attachmentType":"pdf","work_url":"https://www.academia.edu/30589502/Origin_of_U_mineralizing_brines_in_the_Athabasca_Basin_Canada","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-wsj-grid-card-view-pdf" href="https://www.academia.edu/30589502/Origin_of_U_mineralizing_brines_in_the_Athabasca_Basin_Canada"><span class="ds2-5-text-link__content">View 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You can download the paper by clicking the button above.</p></div></div></div></div><div class="ds-sidebar--container js-work-sidebar"><div class="ds-related-content--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="0" data-entity-id="18744474" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/18744474/Unconformity_related_U_deposits_Recent_advances_from_fluid_inclusions_and_their_host_minerals">Unconformity-related U deposits: Recent advances from fluid inclusions and their host minerals</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="32394895" href="https://independent.academia.edu/DavidBanks9">David Banks</a><span>, </span><a class="js-related-work-grid-card-author ds2-5-body-sm 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Mineralization at Fraser Lakes, northern Saskatchewan, Canada</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="4925821" href="https://usask.academia.edu/IrvineAnnesley">Irvine Annesley</a></div><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Composition and U-Th-Pb Chemical Ages of Uranium and Thorium Mineralization at Fraser Lakes, northern Saskatchewan, Canada","attachmentId":47095698,"attachmentType":"pdf","work_url":"https://www.academia.edu/26822403/Composition_and_U_Th_Pb_Chemical_Ages_of_Uranium_and_Thorium_Mineralization_at_Fraser_Lakes_northern_Saskatchewan_Canada","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free 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