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TitleMineralogical, sulphur, and lead isotopic study of the Lemarchant Zn-Pb-Cu-Ag-Au-VMS deposit: implications for precious-metal enrichment processes in the VMS environment
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AuthorGill, S B; Piercey, S J; Layton-Matthews, D; Layne, G D; Piercey, G
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. 183-195, (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherNatural Resources Canada
Documentopen file
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
AreaRed Indian Lake
Lat/Long WENS -56.7500 -56.5833 48.6667 48.5000
Subjectseconomic geology; mineralogy; Archean; volcanogenic deposits; sulphide deposits; alteration; metamorphism; mineral assemblages; mineralization; exploration guidelines; volcanic rocks; mineral deposits; gold; mineral occurrences; zinc; lead; copper; silver; sulphides; barite; sphalerite; pyrite; chalcopyrite; bornite; tetrahedrite; tennantite; stromeyerite; galena; facies; stratiform deposits; isotopes; lead isotope ratios; sulphur isotope ratios; Dunnage Zone; Red Indian Line; Lemarchant volcanogenic massive sulphide deposit; Tally Pond belt; Precambrian; Paleozoic; Cambrian
Illustrationslocation maps; photomicrographs; tables; histograms; cross-sections
ProgramTargeted Geoscience Initiative (TGI-4), Volcanogenic Massive Sulfide Ore Systems
Released2015 06 11
AbstractThe Lemarchant deposit is a Cambrian volcanogenic massive sulphide (VMS) deposit located in the Central Mobile Belt of the Newfoundland Appalachians. Unlike other polymetallic VMS deposits in the bimodal felsic Tally Pond group, Lemarchant is enriched in precious metals. The deposit is composed of contrasting styles of sulphide mineralization, and formed in three discrete stages: Stage 1: barite-rich, low-temperature (<250oC) VMS mineralization; Stage 2: 150 to 250oC intermediate- to high-sulphidation epithermal-style mineralization; and Stage 3: polymetallic, high-temperature (>300oC) VMS mineralization. Sulphur isotopes suggest that S is derived from three sources: thermochemically reduced seawater sulphate, leached igneous basement rock, and magmatic SO2. Lead isotopes indicate that Pb is primarily derived from evolved crustal material, with some input from juvenile volcanic rock (i.e. arc-rift). Precious metals associated with epithermal-style mineralization are consistent with a magmatic contribution to the hydrothermal fluid. Precious metals were precipitated from intermittently boiled fluids, at relatively shallow (<1500 m) water depth.