| Titre | Geology, U-Pb geochronology, and geochemistry of the Miocene Pheno Mountain complex, Hoodoo Mountain area, British Columbia |
| |
| Auteur | Zagorevski, A ;
Dziawa, C; Friedman, R M; Mihalynuk, M G |
| Source | Geological Fieldwork 2012; British Columbia Ministry of Energy, Mines and Petroleum Resources, Paper 2013-1, 2013 p. 115-126  Accès ouvert |
| Liens | Online - En ligne
|
| Image |  |
| Année | 2013 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20120328 |
| Document | publication en série |
| Lang. | anglais |
| Media | papier |
| Formats | pdf |
| Province | Colombie-Britannique |
| SNRC | 104B/14 |
| Région | Hoodoo Mountain |
| Lat/Long OENS | -131.5000 -131.3333 56.9667 56.8667 |
| Sujets | roches ignées; roches volcaniques; magmatisme; rhyolites; trachytes; Miocène; géochronologie; géochimie; pétrologie ignée et métamorphique; Cénozoïque; Tertiaire |
| Illustrations | cartes de localisation; photographies; tableaux; graphiques |
| Programme | GEM : La géocartographie de l'énergie et des minéraux Gisements polymétalliques - nord-ouest de la Cordillère canadienne (Yukon et
Colombie-Britannique) |
| Diffusé | 2013 01 01 |
| Résumé | (disponible en anglais seulement)
The 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. |
| GEOSCAN ID | 292095 |
|
|