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Iron Trig cone description and information


Type:Scoria cone and lava-flow apron
Most Recent Activity:-86050
Seismically Monitored: No
Elevation: 4259 ft (1298 m)
Latitude: 58.64226° N
Longitude:154.47059° W
Quadrangle:Mt Katmai
CAVW Number:
Pronunciation: Sound file
Nearby towns:Kokhanok 56 mi (90 km) NW
Pope-Vannoy Landing 63 mi (102 km) NW
Port William 69 mi (111 km) SE
Igiugig 70 mi (112 km) NW
Anchorage 238 mi (383 km) NE
This feature is part of the Savonoski River Cluster of volcanoes, as defined by Hildreth and others (2004) [1]. From Hildreth and others (2004) [1]: "Iron Trig Cone (Peak 4260) is a mafic scoria cone (53-54% SiO2) atop the basement divide between the Savonoski and Kamishak Rivers, 50 km NE of Mount Katmai and 25 km north of Mount Denison. The glaciated cone, 800 m across with 250 m relief, consists of stratified scoria, agglutinate, and thin lava sheets that are cut by a small intrusion exposed on the west face. Ejecta and lava contain phenocrysts of plagioclase, olivine, clinopyroxene, and magnetite. A lava-flow apron (88 +/- 27 ka) descends the WSW flank to an elevation 300 m lower than the cone, condensing into a single flow 20 m thick at its eroded terminus, 2 km from the cone."

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Page modified: March 2, 2017 15:59
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