| Titre | Preliminary geochemical results on mantle metal mobility |
| Télécharger | Téléchargement (publication entière) |
| Auteur | Lawley, C J M; Kjarsgaard, B A; Zagorevski, A; Pearson, G; Waterton, P; Savard, D; Jackson, S E; Yang, Z; Zhang, S; Tschirhart, V |
| Source | Targeted 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 (Accès ouvert) |
| Année | 2018 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/306445 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Rogers, N;
(2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Commission géologique du Canada, Dossier public 8358 |
| Formats | pdf |
| Province | Colombie-Britannique; Ontario |
| SNRC | 32D; 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 |
| Sujets | gisements 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; Cordillère canadienne; 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 |
| Illustrations | location maps; geoscientific sketch maps; photographs; photomicrographs |
| Programme | Initiative géoscientifique ciblée (IGC-5), Gestion de la connaissance de IGC |
| Programme | Initiative géoscientifique ciblée (IGC-5), Systèmes aurifères |
| Diffusé | 2018 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 ID | 306445 |
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