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TitreVolcanic architecture and alteration assemblages of the Ming Cu-Au-(Zn-Ag) VMS deposit, Baie Verte, Newfoundland and Labrador: implications for Au-enrichment processes and exploration
TéléchargerTéléchargement (publication entière)
AuteurPilote, J -L; Piercey, S J; Mercier-Langevin, P
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development; par Peter, J M (éd.); Mercier-Langevin, P (éd.); Commission géologique du Canada, Dossier public 7853, 2015 p. 197-210, https://doi.org/10.4095/296553
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Année2015
ÉditeurRessources naturelles Canada
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/296553
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Peter, J M; Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development, Commission géologique du Canada, Dossier public 7853
Formatspdf
ProvinceTerre-Neuve-et-Labrador
SNRC12H/16
Lat/Long OENS -56.1397 -56.0217 49.9317 49.8658
SujetsArchéen; gîtes volcanogènes; gîtes sulfureux; altération; métamorphisme; assemblages de minéraux; minéralisation; directives d'exploration; roches volcaniques; gisements minéraux; or; altération hydrothermale; analyses stratigraphiques; corrélations stratigraphiques; gîtes minéralogiques; cuivre; zinc; sulfures; déformation; Groupe de Pacquet Harbour ; géologie économique; stratigraphie; Précambrien; Paléozoïque; Ordovicien; Cambrien
Illustrationslocation maps; photomicrographs; cross-sections; histograms
ProgrammeÉtude des gîtes de sulfures massifs volcaniques, Initiative géoscientifique ciblée (IGC-4)
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
The Ming deposit is hosted in Cambro-Ordovician intermediate to felsic rocks underlain by ca. 490 Ma ophiolite slivers of boninitic composition. The deposit consists of five elongated semi-massive to massive sulphide lenses that plunge 30o to the northeast and occur in the uppermost part of a calc-alkalic intermediate to felsic volcanic succession. The immediate hanging wall varies from mafic volcanic breccia to magnetite- rich volcanogenic siltstone. Three generations of mafic to intermediate intrusive rocks are present in the deposit; they each have distinctive lithogeochemical signatures and are interpreted to be genetically related to the mafic rocks of the cover sequence.
The Ming deposit has seven distinct alteration mineral assemblages (from proximal to distal from mineralization): quartz-pyrite, quartz-calcite-garnet, sericite-green mica-sulphide, sericite-quartz-pyrite, chlorite- amphibole-quartz, chlorite-sericite-quartz-sulphide, and chlorite-stringer zone assemblages. A chalcopyrite- pyrrhotite-pyrite stringer zone associated with the chlorite-stringer zone assemblage occurs 50-100 m stratigraphically below the Ming North and Ming South lenses, at what was the site of high-temperature fluid discharge from a hydrothermal system. The spatial and temporal geological relationships between the stratigraphic package, alteration styles, mineralization, and deformation strongly support a syngenetic origin for mineralization and Au-enrichment.
GEOSCAN ID296553