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TitreIn situ LA-ICP-MS of sulfide minerals in VMS deposits throughout the Bathurst Mining Camp, New Brunswick, Canada: volatile trace-element contents and distribution with implications for their syngenetic to polyphase metamorphic history
TéléchargerTéléchargements
AuteurDehnavi, A S; McFarlane, C R M; McClenaghan, S H; Lentz, D R
SourceCommission géologique du Canada, Dossier public 7537, 2014, 1 feuille, https://doi.org/10.4095/293681
Année2014
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/293681
Mediaen ligne; numérique
Formatspdf
ProvinceNouveau-Brunswick
SNRC21O/01; 21O/02; 21O/03; 21O/06; 21O/07; 21O/08; 21O/09; 21O/10; 21O/11; 21P/04; 21P/05; 21P/12
Lat/Long OENS-66.5833 -65.7500 47.7500 47.1333
Sujetsanalyse par spectromètre de masse; minéralisation; zinc; cuivre; plomb; or; argent; gîtes volcanogènes; gîtes sulfureux; pétrographie; distribution des éléments; répartition des éléments en trace; analyses des éléments en trace; éléments en trace; Camp minier de Bathurst; géologie économique; géochimie; Paléozoïque; Ordovicien
Illustrationslocation maps; photomicrographs; tables; plots
Consultation
Endroit
 
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
 
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
Image
Diffusé2014 03 02
Résumé(disponible en anglais seulement)
The world-class massive sulfide deposits of Zn-Pb-Cu-Ag-Au type in the Bathurst Mining Camp, Eastern Canada are hosted within Middle Ordo-vician bimodal volcanic and sedimentary sequences. They have undergone complex polyphase deformation and associated regional greenschist and locally blueschist facies metamorphism during closure of the Tetagouche-Exploits back-arc basin in the Late Ordovician to Early Silurian (Salinic Orogeny) and again during the Late Silurian Acadian Orogeny. The mineralogy of massive sulfides consists of five minerals (pyrite, sphalerite, galena, pyrrhotite, and chalcopyrite) that comprise 95% of the mineralization, with minor amounts of arsenopyrite, marcasite, and sulfosalts. In situ LA-ICP-MS analyses of the volatile trace-element suite (As, Cd, Hg, In, Sb, Tl, etc.) of the major sulfide minerals in some of the deposits in the BMC offer a lower detection limits than other micro-analytical methods. Data from the representative massive sulfide deposits of the BMC show that in addition to arsenopyrite, As is also concentrated in some pyrite porphyroclasts, galena, sphalerite, and chalcopyrite. Cadmium is enriched in galena and sphalerite. The most dominant carrier of Hg is sphalerite, followed by pyrite. Indium is enriched mostly in sphalerite and chalcopyrite. Antimony abundances are more variable, but it typically occurs in pyrite, and to a lesser degree in galena. Also, arsenopyrite ex-hibits a high content of Sb likely because of substitution of Sb and As in solid solutions. Thallium shows variable distribution, but it is mostly en-riched in pyrite. Abundances of volatile elements in Bathurst Mining Camp show that the contents of these elements varies in the various types of VMS depos-its, which reflect the different conditions of massive sulfides formation, such as differences in the temperature of deposition, metal sources, and geochemical characters of the ore-bearing solutions and host rocks. Because of the primary variation of volatile trace elements in these sulfide facies, they can be used in enhancing our interpretation of the ore-forming environment, as well as potentially be used as a trace-element vec-toring tool (volatile element halos dispersions) in the exploration for massive sulfide deposits.
Résumé(Résumé en langage clair et simple, non publié)
L'Initiative géoscientifique ciblée (IGC-4) est un programme géoscientifique fédéral de collaboration qui fournit à l'industrie les connaissances géoscientifiques et les techniques novatrices de prochaine génération dont elle a besoin pour mieux détecter les gîtes minéraux enfouis, réduisant ainsi certains risques liés à l'exploration. Les gisements de sulfures massifs à métaux communs représentent une source importante pour la production canadienne de zinc, de plomb, de cuivre et d'argent, dont une grande partie provient du camp minier de Bathurst, au Nouveau-Brunswick. Cette étude examine la présence d'autres éléments dits éléments traces volatils, notamment le mercure, dans les gros gisements de la région, ainsi que plusieurs autres, dans le but d'évaluer si leur abondance dans les gisements et dans les roches du milieu environnant peut servir à trouver d'autres gisements de même type.
GEOSCAN ID293681