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TitleRecent basaltic volcanism in the Iskut-Unuk rivers area, northwestern British Columbia
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AuthorHauksdóttir, S; Enegren, E G; Russell, J K
SourceCordillera and Pacific Margin/Cordillère et marge du Pacifique; by Geological Survey of Canada; Geological Survey of Canada, Current Research no. 1994-A, 1994 p. 57-67, https://doi.org/10.4095/193622 (Open Access)
Year1994
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (1994). Cordillera and Pacific Margin, Geological Survey of Canada, Current Research no. 1994-A
File formatpdf
ProvinceBritish Columbia
NTS104B
AreaIskut River; Unuk River; Snippaker Creek; Cone Glacier; Cinder Mountain; King Creek; Lava Fork; Blue River
Lat/Long WENS-132.0000 -130.0000 57.0000 56.0000
Subjectsigneous and metamorphic petrology; Recent; volcanic vents; volcanoes; lava flows; cinder cones; glaciers; radiocarbon dates; potassium argon dates; radiometric dates; volcanic rocks; basalts; pyroclastics; igneous rocks; Quaternary
Illustrationssketch maps; photographs; analyses
Released1994 02 01
AbstractThe Iskut-Unuk rivers area contains eight Recent volcanic centres comprising alkali-basalt lava flows, pillow lava, hyaloclastite and cinder cones, including: the Iskut River, Tom MacKay Creek, Snippaker Creek, Cone Glacier, Cinder Mountain, King Creek, Second Canyon and Lava Fork centres. Lava flows range from 70 000 to ~150 years. The oldest volcanic rocks underlie the Iskut River Lava Flats and the youngest occur at the Lava Fork centre. The lavas erupted from each centre are similar in mineralogy. Most contain plagioclase and olivine phenocrysts and clinopyroxene occurs as a groundmass phase. Plagioclase megacrysts characterize lavas from a number of volcanic centres, but are particularly abundant in lavas from Snippaker Creek and Cone Glacier. Crustal xenoliths are abundant in Lava Fork and Cone Glacier lavas but less common elsewhere. Many of the volcanological features are attributable to volcanic eruptions occurring near and beneath glaciers.
GEOSCAN ID193622