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TitleGeology, U-Pb geochronology, and geochemistry of the Miocene Pheno Mountain complex, Hoodoo Mountain area, British Columbia
AuthorZagorevski, AORCID logo; Dziawa, C; Friedman, R M; Mihalynuk, M G
SourceGeological Fieldwork 2012; British Columbia Ministry of Energy, Mines and Petroleum Resources, Paper 2013-1, 2013 p. 115-126 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20120328
File formatpdf
ProvinceBritish Columbia
AreaHoodoo Mountain
Lat/Long WENS-131.5000 -131.3333 56.9667 56.8667
Subjectsgeochronology; geochemistry; igneous and metamorphic petrology; igneous rocks; volcanic rocks; magmatism; rhyolites; trachytes; Miocene; Cenozoic; Tertiary
Illustrationslocation maps; photographs; tables; plots
ProgramGEM: Geo-mapping for Energy and Minerals Multiple Metals - NW Canadian Cordillera (Yukon, B.C.)
Released2013 01 01
AbstractThe Pheno Mountain complex comprises rhyolite, trachyte and intrusive quartz feldspar porphyry that form extrusive and hypabyssal
portions of a volcanic complex. A subvolcanic quartz feldspar porphyry with columnar jointing and brecciated margins underlies
petrographically identical volcanic rocks. It yielded a 7.78 ±0.01 Ma U-Pb zircon crystallization age, which is interpreted to constrain
the age of the Pheno Mountain complex. Both the volcanic and hypabyssal rocks are characterized by high Nb/Y, Nb, Y, and Zr
suggesting that they formed in a within-plate setting by fractional crystallization from an alkali basalt parent. These data support
correlation of the Pheno Mountain complex with the Neogene to Quaternary Northern Cordilleran Volcanic Province. However, in
contrast to the coeval Mount Edziza and Level Mountain volcanic centres, magmatism in the Pheno Mountain complex does not appear
to be preceded by construction of a basaltic shield.

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