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TitreControls on indium mineralisation in tin-tungsten-base metal deposits of the Canadian Appalachians
TéléchargerTéléchargement (publication entière)
AuteurGoeddeke, C R; Chapman, J B; Samson, I M
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 7843, 2015 p. 101-110, (Accès ouvert)
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Commission géologique du Canada, Dossier public 7843
ProvinceNouveau-Brunswick; Nouvelle-Écosse
SNRC21A; 21H; 21G
Lat/Long OENS -68.0000 -64.0000 46.0000 44.0000
Lat/Long OENS -56.5000 -55.0000 48.0000 47.5000
Lat/Long OENS-124.0000 -120.0000 53.0000 50.0000
Lat/Long OENS -78.4000 -78.4000 48.2833 48.2167
Sujetsgisements porphyriques; cuivre porphyrique; prospection minière; minéralisation; altération; tungstène; molybdène; étain; bismuth; échantillons globaux; gisements minéraux; interpretations structurelles; molybdenite; roches intrusives; roches granitiques; pétrogenèse; cuivre; or; roches ignées; indium; Dépôt de Mount Pleasant ; Batholite de South Mountain ; géologie économique; minéraux métalliques; géochimie; minéralogie
Illustrationslocation maps; photographs; photomicrographs; cross-sections; ternary diagrams
ProgrammeInitiative géoscientifique ciblée (IGC-4), Étude des gîtes porphyriques
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
Indium is a minor but potentially economically significant component of the ore metal tenor of many porphyry-style, stockwork and polymetallic vein-type Sn-W and Sn-base metal deposits of the Canadian Appalachians. However, indium distribution between deposits is highly uneven, and whereas some deposits contain hundreds of kilograms of the metal at grades sufficient to justify recovery, others are near-barren. In order to investigate the fundamental temperature, mineralogical, spatial and chemical controls on indium mineralisation in the district, this study has taken samples from indium rich and poor occurrences at 10 drilled prospects in southern New Brunswick and southwest Nova Scotia, as well as from the past-producing East Kemptville Mine in Nova Scotia.
Detailed mineralogical characterization of these materials has shown that, contrary to existing models, within this district indium is commonly introduced early in the deposit paragenesis, presumably as a component of the initial, high-temperature magmatic-hydrothermal fluids. During this phase of mineralisation, indium is dominantly precipitated within copper-rich sphalerite, and it is the distribution of this mineral phase that primarily governs the presence or absence of indium within a mineralised body. During later cooling of the deposit a proportion of the indium is exsolved from sphalerite during recrystallization, and forms lamellae of a sulphide mineral that resembles sakuraiite in the core zones of many individual sphalerite.