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TitrePreliminary geochemical results on mantle metal mobility
TéléchargerTéléchargement (publication entière)
AuteurLawley, C J M; Kjarsgaard, B A; Zagorevski, A; Pearson, G; Waterton, P; Savard, D; Jackson, S E; Yang, Z; Zhang, S; Tschirhart, V
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 8358, 2018 p. 127-131, https://doi.org/10.4095/306445
Année2018
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/306445
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Commission géologique du Canada, Dossier public 8358
Formatspdf
ProvinceColombie-Britannique; Ontario
SNRC32D; 32E; 104J; 104K; 104N; 104O
Lat/Long OENS-134.0000 -130.0000 60.0000 58.0000
Lat/Long OENS -80.0000 -80.0000 48.5000 48.0000
Sujetsgisements minéraux; potentiel minier; prospection minière; contrôles des minerais; genèse des minerais; or; nickel; cuivre; métaux de base; manteau terrestre; ophiolites; kimberlites; inclusions; roches hôtes; roches mères; etudes isotopiques; rapports des isotopes de plomb; pyroxene monoclinique; olivine; analyses par microsonde électronique; analyse par spectromètre de masse; analyses au microscope électronique à balayage; analyses spectroscopiques; géologie du substratum rocheux; lithologie; roches ignées; roches intrusives; granites; tonalites; roches ultramafiques; Canadian Cordillère; Terrane de Cache Creek ; Bouclier Canadien; Province de Superior ; Subprovince d'Abitibi ; Groupe de Blake River ; Groupe de Tisdale ; Assemblage de Kidd-munro ; géologie économique; pétrologie ignée et métamorphique; géochimie; minéralogie; Phanérozoïque; Mésozoïque; Précambrien; Protérozoïque
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeGestion de la connaissance de IGC, Initiative géoscientifique ciblée (IGC-5)
ProgrammeSystèmes aurifères, Initiative géoscientifique ciblée (IGC-5)
Diffusé2018 01 19
Résumé(disponible en anglais seulement)
Processes operating within mantle source regions likely impact the fertility of ore-bearing melts, although the precise link between mantle conditioning and ore genesis remain poorly understood. New fieldwork and isotopic (Re-Os and Pb-Pb) results for ultramafic samples from young (Mesozoic), ophiolitic mantle near Atlin British Columbia, document ancient (i.e. Paleoproterozoic and younger), refractory mantle domains hosted within variably depleted harzburgite. The metal endowment of these distinct mantle segments and the microscale distribution of gold, platinum group elements and base metals are the focus of on-going study.
Field-based research at Atlin complements chemical analysis of kimberlite-hosted mantle olivine and clinopyroxene xenocrysts. These mantle fragments provide a snapshot of the ancient, sub-continental lithospheric mantle beneath the Neoarchean Abitibi sub-province (Kirkland Lake kimberlite field). Geochemical depth profiles, based on preliminary in situ geochemical results of the least-altered xenocrysts, suggest that high temperature olivine is a significant silicate mineral host for some of the so-called chalcophile elements at depth (e.g. Cu and Zn). Other metals, including a rare subset of xenocrysts that yield concentrations for gold and platinum at or above the analytical detection limit (1-5 ppb), occur as micro-inclusions. The distribution of metal-bearing mineral phases within the mantle and, the micro-scale setting of metals within those phases (e.g. mineral inclusions versus lattice substitution), may control the variable metallic endowment of mantle-derived melts in ancient and modern settings.
GEOSCAN ID306445