Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut
International audience Among the many types of mineral deposits within Archean cratons, gold mineralization is an important economic commodity with over 20,000 metric tons of gold produced from greenstone belts in 2001. Of the Archean-early Paleoproterozoic gold deposits, several different types of...
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ftccsdartic:oai:HAL:hal-02283944v1 2023-05-15T17:48:05+02:00 Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut Gourcerol, Blandine Thurston, P.C. Kontak, D.J. Côté-Mantha, O. Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) 2015-09 https://hal-brgm.archives-ouvertes.fr/hal-02283944 https://doi.org/10.1016/j.chemgeo.2015.06.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2015.06.008 hal-02283944 https://hal-brgm.archives-ouvertes.fr/hal-02283944 doi:10.1016/j.chemgeo.2015.06.008 ISSN: 0009-2541 Chemical Geology https://hal-brgm.archives-ouvertes.fr/hal-02283944 Chemical Geology, Elsevier, 2015, 410, pp.89-107. ⟨10.1016/j.chemgeo.2015.06.008⟩ [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.1016/j.chemgeo.2015.06.008 2021-10-17T00:24:28Z International audience Among the many types of mineral deposits within Archean cratons, gold mineralization is an important economic commodity with over 20,000 metric tons of gold produced from greenstone belts in 2001. Of the Archean-early Paleoproterozoic gold deposits, several different types of mineralization are known, which includes the important Algoma-type banded iron formation (BIF) where gold is locally associated with sulfide-facies zones within regionally extensive oxide-facies. It is commonly accepted that the shale-normalized chemical signature of REE + Y of chert bands in Algoma-type BIFs may reflect one of the three processes, each of which may be relevant to the nature and origin of the gold mineralization: (1) direct seawater precipitation; (2) involvement of and contribution from hydrothermal fluids; and (3) replacement of precursor volcanic units due to silicification. An essential question in regard to the mineralization is, therefore, whether the gold mineralizing fluids have a preference for one geochemical type of iron formation versus another. In order to assess the relevance of these competing models, we report herein the results of a LA ICP-MS study of chert samples within different Algoma-type BIFs from the Meadowbank deposit (24.5 Mt proven/probable ore reserves grading 2.8 g/t (2011)) hosted in the Neoarchean Woodburn Lake Group of the Rae Domain of the western Churchill Province, Canada. This study used 39 carefully selected and characterized (i.e., petrography and SEM-EDS imaging) chert samples from the main deposit, the Central BIF, and four additional BIFs, the Far West, West, East and Grizzly zones, with data collected using line traverses along the chert bands. The geochemical data indicate that an ambient seawater signature (i.e., enrichment in HREE relative to LREE associated with positive La and Y anomalies) dominates the samples with a lesser hydrothermal component (characterized by a positive Eu anomaly) and the influence of detrital contamination can also be detected. ... Article in Journal/Newspaper Nunavut Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Canada Nunavut Rae ENVELOPE(-116.053,-116.053,62.834,62.834) Chemical Geology 410 89 107 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Gourcerol, Blandine Thurston, P.C. Kontak, D.J. Côté-Mantha, O. Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
topic_facet |
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience Among the many types of mineral deposits within Archean cratons, gold mineralization is an important economic commodity with over 20,000 metric tons of gold produced from greenstone belts in 2001. Of the Archean-early Paleoproterozoic gold deposits, several different types of mineralization are known, which includes the important Algoma-type banded iron formation (BIF) where gold is locally associated with sulfide-facies zones within regionally extensive oxide-facies. It is commonly accepted that the shale-normalized chemical signature of REE + Y of chert bands in Algoma-type BIFs may reflect one of the three processes, each of which may be relevant to the nature and origin of the gold mineralization: (1) direct seawater precipitation; (2) involvement of and contribution from hydrothermal fluids; and (3) replacement of precursor volcanic units due to silicification. An essential question in regard to the mineralization is, therefore, whether the gold mineralizing fluids have a preference for one geochemical type of iron formation versus another. In order to assess the relevance of these competing models, we report herein the results of a LA ICP-MS study of chert samples within different Algoma-type BIFs from the Meadowbank deposit (24.5 Mt proven/probable ore reserves grading 2.8 g/t (2011)) hosted in the Neoarchean Woodburn Lake Group of the Rae Domain of the western Churchill Province, Canada. This study used 39 carefully selected and characterized (i.e., petrography and SEM-EDS imaging) chert samples from the main deposit, the Central BIF, and four additional BIFs, the Far West, West, East and Grizzly zones, with data collected using line traverses along the chert bands. The geochemical data indicate that an ambient seawater signature (i.e., enrichment in HREE relative to LREE associated with positive La and Y anomalies) dominates the samples with a lesser hydrothermal component (characterized by a positive Eu anomaly) and the influence of detrital contamination can also be detected. ... |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) |
format |
Article in Journal/Newspaper |
author |
Gourcerol, Blandine Thurston, P.C. Kontak, D.J. Côté-Mantha, O. |
author_facet |
Gourcerol, Blandine Thurston, P.C. Kontak, D.J. Côté-Mantha, O. |
author_sort |
Gourcerol, Blandine |
title |
Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
title_short |
Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
title_full |
Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
title_fullStr |
Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
title_full_unstemmed |
Interpretations and implications of LA ICP-MS analysis of chert for the origin of geochemical signatures in banded iron formations (BIFs) from the Meadowbank gold deposit, Western Churchill Province, Nunavut |
title_sort |
interpretations and implications of la icp-ms analysis of chert for the origin of geochemical signatures in banded iron formations (bifs) from the meadowbank gold deposit, western churchill province, nunavut |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal-brgm.archives-ouvertes.fr/hal-02283944 https://doi.org/10.1016/j.chemgeo.2015.06.008 |
long_lat |
ENVELOPE(-116.053,-116.053,62.834,62.834) |
geographic |
Canada Nunavut Rae |
geographic_facet |
Canada Nunavut Rae |
genre |
Nunavut |
genre_facet |
Nunavut |
op_source |
ISSN: 0009-2541 Chemical Geology https://hal-brgm.archives-ouvertes.fr/hal-02283944 Chemical Geology, Elsevier, 2015, 410, pp.89-107. ⟨10.1016/j.chemgeo.2015.06.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2015.06.008 hal-02283944 https://hal-brgm.archives-ouvertes.fr/hal-02283944 doi:10.1016/j.chemgeo.2015.06.008 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2015.06.008 |
container_title |
Chemical Geology |
container_volume |
410 |
container_start_page |
89 |
op_container_end_page |
107 |
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1766153279923814400 |