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TitlePetrology, geochemistry, and geochronology of the granitic pegmatite and aplite dykes associated with the Clarence Stream gold deposit, southwestern New Brunswick
AuthorThorne, K G; Lentz, D R; Hall, D C; Yang, X
SourceGeological Survey of Canada, Current Research (Online) no. 2002-E12, 2002, 13 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2002). Current Research 2002, summer release, Geological Survey of Canada, Current Research no. 2002
File formatpdf
ProvinceNew Brunswick
AreaRollingdam; 14
Lat/Long WENS-67.5000 -67.0000 45.5000 45.2500
Subjects6; igneous and metamorphic petrology; geochemistry; geochronology; granites; pegmatites; aplites; dykes; gold; mineralization; radiometric dating; uranium thorium dates; felsic intrusive rocks; intrusive rocks; analytical methods; ore mineral genesis; Clarence Stream gold deposit; Saint George Batholith; Magaguadavic Granite; Pleasant Ridge Granite; Sorrel Ridge Granite; electron microprobe analyses; Silurian; Ordovician; Paleozoic
Illustrationssketch maps; photographs; ternary diagrams; plots
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
Released2002 09 16
AbstractGranitic dykes intimately associated with auriferous sulphide-bearing quartz veins crosscut metasedimentary and metagabbroic units at the Clarence Stream gold deposit in southwestern New Brunswick. Aplitic, granophyric, pegmatitic, and leucogranitic dykes of granitic composition (SiO2 = wt. %) are weakly metaluminous to peraluminous (A/CNK = Low Nb, Ta, La, Y, and Yb with high Rb contents indicate a syncollisional (S-type) or fractionated volcanic-arc (I-type) affinity. Electron microprobe dating of monazite within a pegmatitic sample yielded a crystallization age of 390 " 8Ma (high Th+U) and another population (low Th+U) that coincides with Taconic orogenic events (449 " 10 Ma). Low Sb, W, Mo, and Bi concentrations along with the coincident age of emplacement and trace-element systematics favour a fractional crystallization relationship with the main phase of the Magaguadavic Granite during late-stage vapour saturation. The spatial and temporal relationship to gold-bearing sulphide-quartz veins is consistent with an intrusion-related genetic model.