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TitleVolcanic 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
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AuthorPilote, 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; by Peter, J M (ed.); Mercier-Langevin, P (ed.); Geological Survey of Canada, Open File 7853, 2015 p. 197-210, https://doi.org/10.4095/296553 (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in 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, Geological Survey of Canada, Open File 7853
File formatpdf
ProvinceNewfoundland and Labrador
NTS12H/16
AreaBaie Verte Peninsula
Lat/Long WENS -56.1397 -56.0217 49.9317 49.8658
Subjectseconomic geology; stratigraphy; Archean; volcanogenic deposits; sulphide deposits; alteration; metamorphism; mineral assemblages; mineralization; exploration guidelines; volcanic rocks; mineral deposits; gold; hydrothermal alteration; stratigraphic analyses; stratigraphic correlations; mineral occurrences; copper; zinc; sulphides; deformation; Ming Mine; Pacquet Harbour Group; Precambrian; Paleozoic; Ordovician; Cambrian
Illustrationslocation maps; photomicrographs; cross-sections; histograms
ProgramVolcanogenic Massive Sulfide Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractThe 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