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Ingrisarak Mountain description and information

INGRISARAK MTN LINKS

SAMPLES
LOCATION
FACTS
Official Name: Ingrisarak Mountain
Type:Cinder cone
Most Recent Activity:
Seismically Monitored: No
Elevation: 364 ft (111 m)
Latitude: 61.51527° N
Longitude:165.25638° W
Quadrangle:Hooper Bay
CAVW Number:
Nearby towns:Chevak 11 mi (18 km) NW
Paimiut 23 mi (37 km) NW
Scammon Bay 25 mi (40 km) NW
Hooper Bay 28 mi (45 km) NW
Anchorage 508 mi (817 km) SE
DESCRIPTION
From Wood and Kienle (1990): "Ingrisarak Mountain is a volcanic vent, composed entirely of red and black basalt scoria. It is 10 x 11 km in size." From Hoare and Condon, 1968: "Basalt (Qb) forms Ingrisarak Mountain, a volcanic vent, and also crops out near the eastern edge of the quadrangle on the flank of a similar vent in the adjoining Marshall quadrangle. Red and black fragments of basalt scoria are widespread in both areas, but no rock was found in place. The fragments have not moved far; they are angular, unweathered, and commonly show ropy flow features. The basalt consists of scattered phenocrysts of pyroxene and olivine in a fine-grained matrix. The basalt is assigned a Quaternary age because it is very fresh appearing and because the volcanic vents, although modified, are still physiographically expressed. Paleomagnetic measurements on oriented specimens from similar volcanic vents in the adjoning Marshall and Kwiguk quadrangles show that the basalt is normally magnetized. The physiographic expression and normal magnetic polarity suggests that the basalt was extruded during the latest (Brunhes) normal polarity epoch (Cox and others, 1964, 1965). Recent studies (Dalrymple and others, 1965, Doell and othres, 1966) indicate that the Brunhes epoch began about 0.7 million years ago."
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Page modified: June 12, 2014 07:20
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