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Oxygen fugacity and volatile content of syntectonic magmatism in the Neoarchean Abitibi greenstone belt, Superior Province, Canada

Madon Baptiste, Mathieu Lucie et March Jeffrey H.. (2020). Oxygen fugacity and volatile content of syntectonic magmatism in the Neoarchean Abitibi greenstone belt, Superior Province, Canada. Minerals, 10, (11), p. 966.

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URL officielle: http://dx.doi.org/doi:10.3390/min10110966

Résumé

Neoarchean syntectonic intrusions from the Chibougamau area, northeastern Abitibi Subprovince (greenstone belt), may be genetically related to intrusion related gold mineralization. These magmatic-hydrothermal systems share common features with orogenic gold deposits, such as spatial and temporal association with syntectonic magmatism. Genetic association with magmatism, however, remains controversial for many greenstone belt hosted Au deposits. To precisely identify the link between syntectonic magmas and gold mineralization in the Abitibi Subprovince, major and trace-element compositions of whole rock, zircon, apatite, and amphibole grains were measured for five intrusions in the Chibougamau area; the Anville, Saussure, Chevrillon, Opémisca, and Lac Line Plutons. The selected intrusions are representative of the chemical diversity of synvolcanic (TTG suite) and syntectonic (e.g., sanukitoid, alkaline intrusion) magmatism. Chemical data enable calculation of oxygen fugacity and volatile content, and these parameters were interpreted using data collected by electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry. The zircon and apatite data and associated oxygen fugacity values in magma indicate that the youngest magmas are the most oxidized. Moreover, similar oxygen fugacity and high volatile content for both the Saussure Pluton and the mineralized Lac Line intrusion may indicate a possible prospective mineralized system associated with the syntectonic Saussure intrusion.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:10
Numéro:11
Pages:p. 966
Version évaluée par les pairs:Oui
Date:28 Octobre 2020
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:oxygen fugacity, volatile content, syntectonic intrusions, Abitibi greenstone belt, fugacité d'oxygène, teneur volatile, intrusions syntectoniques, ceinture de roches vertes de l'Abitibi
Déposé le:27 janv. 2021 22:48
Dernière modification:27 janv. 2021 22:48
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