Bibliographische Detailangaben
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Personen und Körperschaften:
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Zagorevski, A (VerfasserIn); Dziawa, C (VerfasserIn); Friedman, R M (VerfasserIn); Mihalynuk, M G (VerfasserIn) |
| Format: |
Zeitschrift
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| Sprache: |
English
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| veröffentlicht: |
2013 |
| Gesamtaufnahme: |
GEM: Geo-mapping for Energy and Minerals
, Geological Fieldwork 2012; British Columbia Ministry of Energy, Mines and Petroleum Resources, Paper 2013-1, 2013 p. 115-126, Earth Sciences Sector, Contribution Series
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| Schlagwörter: |
Igneous Rocks;
Volcanic Rocks;
Magmatism;
Rhyolites;
Trachytes;
Miocene;
British Columbia;
Hoodoo Mountain;
Zeitschrift;
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| Quelle: |
GEOSCAN
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| Zusammenfassung: |
The Pheno Mountain complex comprises rhyolite, trachyte and intrusive quart...
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.
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