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TitlePetrochemistry of Lake George granodiorite stock and related gold mineralization, York County, New Brunswick
DownloadDownloads
AuthorYang, X; Lentz, D R; Chi, G
SourceGeological Survey of Canada, Current Research (Online) no. 2002-D7, 2002, 10 pages, https://doi.org/10.4095/213243 (Open Access)
Year2002
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
ProvinceNew Brunswick
NTS21G/14
AreaYork; Lake George; Pokiok
Lat/Long WENS-67.5000 -67.0000 46.0000 45.7500
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; petrography; gold; mineral occurrences; igneous rocks; structural features; mineralization; granodiorites; geochemical analyses; major element geochemistry; trace element geochemistry; Lake George granodiorite stock; Paleozoic; Devonian
Illustrationssketch maps; ternary diagrams; plots
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 03 08
AbstractThe plagioclase-hornblende-biotite porphyritic granodiorite stock (Au = 32 ppb average) at the Lake George Sb-Au-W-Mo deposit, New Brunswick was sampled (10 samples) from drill core and ana-lyzed. It is metaluminous to weakly peraluminous (A/CNK = 0.99-1.13), calc-alkaline, Na 2 O>K 2 O, and has (La/Yb)N from 7.34 to 11.14 with a small negative Eu anomaly, as well as obvious negative Nb, Ti, Sr, and Ba anomalies. The Early Devonian ages and volcanic arc affinities (evolved I-type) favour a relation-ship with the Pokiok Batholith. Gold-bearing quartz-vein mineralization within the stock and in the proximal metamorphic aureoles highlights its metallogenic association with the intrusion. Silicification, sericitization, and chloritization of the stock associated with quartz-vein mineralization are enriched in Au, As, S, W, Mo, Rb, K, and B. These mineralizing fluids may be derived from the same granodioritic magma crystallizing at depth, although later than the W-Mo mineralization. The gold may be associated with an antimony mineralization episode.
GEOSCAN ID213243