Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada)
International audience Pb-isotopes have been proposed as pathfinders for sandstone-hosted unconformity-related U deposits, with isotope ratios providing information on mineralization timing and element remobilization and migration. Pb-isotopes proximal to mineralization display radiogenic signatures...
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Online Access: | https://hal.science/hal-02930760 https://hal.science/hal-02930760/document https://hal.science/hal-02930760/file/minerals-10-00512-v2.pdf https://doi.org/10.3390/min10060512 |
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ftinsu:oai:HAL:hal-02930760v1 2023-06-18T03:39:55+02:00 Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) Quirt, David Benedicto, Antonio University of Manitoba Winnipeg Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal.science/hal-02930760 https://hal.science/hal-02930760/document https://hal.science/hal-02930760/file/minerals-10-00512-v2.pdf https://doi.org/10.3390/min10060512 en eng HAL CCSD MDPI info:eu-repo/semantics/altIdentifier/doi/10.3390/min10060512 hal-02930760 https://hal.science/hal-02930760 https://hal.science/hal-02930760/document https://hal.science/hal-02930760/file/minerals-10-00512-v2.pdf doi:10.3390/min10060512 http://creativecommons.org/licenses/by-sa/ info:eu-repo/semantics/OpenAccess ISSN: 2075-163X Minerals https://hal.science/hal-02930760 Minerals, 2020, 10 (6), pp.512. ⟨10.3390/min10060512⟩ Pb isotopes U exploration geochemistry sample digestions WAL Kiggavik unconformity-related U deposit element dispersion [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.3390/min10060512 2023-06-05T22:48:26Z International audience Pb-isotopes have been proposed as pathfinders for sandstone-hosted unconformity-related U deposits, with isotope ratios providing information on mineralization timing and element remobilization and migration. Pb-isotopes proximal to mineralization display radiogenic signatures, often with ‘excess Pb’ suggestive of derivation from greater U concentrations than are currently present. The U deposits in the Kiggavik project area (west of Baker Lake, NU, Canada) are basement-hosted, contain several generations of pitchblende mineralization, display a strong structural control, and are located in fault-related fracture systems and foliation-parallel veinlets. Drill core samples were analysed by Inductively-Coupled Plasma-Mass Spectrometer (ICP-MS) for Pb isotopes following multi-acid total-digestion, reverse Aqua Regia partial-digestion, and weak-acid-leach attacks, to evaluate the utility of the respective dissolution methods in Pb-isotope pathfinder geochemistry. Partial-digestion results are similar to weak-acid-leach results, indicating that interpretation of Pb-isotope signatures can be carried out from partial-digestion data if weak-acid-leach data are unavailable. Application of this pathfinder method at Kiggavik shows that Pb-isotope ratios display systematic trends useful for exploration vectoring. Uranium-content-adjusted 206Pb/204Pb ratios and 206Pb/204Pb ‘excess-lead’ data highlight anomalous isotopic values. 207Pb/206Pb ratios display downhole trends complementary to location of mineralization. Three-dimensional (3D) distributions of Pb-isotope data at the Contact U prospect show systematic trends and form halos around the mineralization. Isotopic footprints are limited to <50 m from the mineralization outline, reflecting host-rock and structural control, but indicate areas with elevated potential for U mineralization and provide vectoring information within basement lithologies. Article in Journal/Newspaper Baker Lake Nunavut Institut national des sciences de l'Univers: HAL-INSU Canada Nunavut Minerals 10 6 512 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Pb isotopes U exploration geochemistry sample digestions WAL Kiggavik unconformity-related U deposit element dispersion [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Pb isotopes U exploration geochemistry sample digestions WAL Kiggavik unconformity-related U deposit element dispersion [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Quirt, David Benedicto, Antonio Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
topic_facet |
Pb isotopes U exploration geochemistry sample digestions WAL Kiggavik unconformity-related U deposit element dispersion [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Pb-isotopes have been proposed as pathfinders for sandstone-hosted unconformity-related U deposits, with isotope ratios providing information on mineralization timing and element remobilization and migration. Pb-isotopes proximal to mineralization display radiogenic signatures, often with ‘excess Pb’ suggestive of derivation from greater U concentrations than are currently present. The U deposits in the Kiggavik project area (west of Baker Lake, NU, Canada) are basement-hosted, contain several generations of pitchblende mineralization, display a strong structural control, and are located in fault-related fracture systems and foliation-parallel veinlets. Drill core samples were analysed by Inductively-Coupled Plasma-Mass Spectrometer (ICP-MS) for Pb isotopes following multi-acid total-digestion, reverse Aqua Regia partial-digestion, and weak-acid-leach attacks, to evaluate the utility of the respective dissolution methods in Pb-isotope pathfinder geochemistry. Partial-digestion results are similar to weak-acid-leach results, indicating that interpretation of Pb-isotope signatures can be carried out from partial-digestion data if weak-acid-leach data are unavailable. Application of this pathfinder method at Kiggavik shows that Pb-isotope ratios display systematic trends useful for exploration vectoring. Uranium-content-adjusted 206Pb/204Pb ratios and 206Pb/204Pb ‘excess-lead’ data highlight anomalous isotopic values. 207Pb/206Pb ratios display downhole trends complementary to location of mineralization. Three-dimensional (3D) distributions of Pb-isotope data at the Contact U prospect show systematic trends and form halos around the mineralization. Isotopic footprints are limited to <50 m from the mineralization outline, reflecting host-rock and structural control, but indicate areas with elevated potential for U mineralization and provide vectoring information within basement lithologies. |
author2 |
University of Manitoba Winnipeg Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Quirt, David Benedicto, Antonio |
author_facet |
Quirt, David Benedicto, Antonio |
author_sort |
Quirt, David |
title |
Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
title_short |
Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
title_full |
Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
title_fullStr |
Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
title_full_unstemmed |
Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada) |
title_sort |
lead isotopes in exploration for basement-hosted structurally controlled unconformity-related uranium deposits: kiggavik project (nunavut, canada) |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02930760 https://hal.science/hal-02930760/document https://hal.science/hal-02930760/file/minerals-10-00512-v2.pdf https://doi.org/10.3390/min10060512 |
geographic |
Canada Nunavut |
geographic_facet |
Canada Nunavut |
genre |
Baker Lake Nunavut |
genre_facet |
Baker Lake Nunavut |
op_source |
ISSN: 2075-163X Minerals https://hal.science/hal-02930760 Minerals, 2020, 10 (6), pp.512. ⟨10.3390/min10060512⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/min10060512 hal-02930760 https://hal.science/hal-02930760 https://hal.science/hal-02930760/document https://hal.science/hal-02930760/file/minerals-10-00512-v2.pdf doi:10.3390/min10060512 |
op_rights |
http://creativecommons.org/licenses/by-sa/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3390/min10060512 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
6 |
container_start_page |
512 |
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1769004716565463040 |