Iron Trig cone


Facts


  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1298m (4258ft)
  • Latitude: 58.64226
  • Longitude: -154.47059
  • Smithsonian VNum:
  • Pronunciation:
  • Nearby Towns:
    • Kokhanok 56 mi (90 km) NW
    • Pope-Vannoy Landing 63 mi (102 km) NW
    • Igiugig 69 mi (112 km) NW
    • Port William 69 mi (111 km) SE
    • Aleneva 71 mi (115 km) SE

Description

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."

Name Origin

"Iron Trig cone" is an informal name given by Hildreth and others (2004).


References Cited

[1] Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation, 2004

Hildreth, Wes, Fierstein, Judy, Siems, D. F., Budahn, J. R., and Ruiz, Joaquin, 2004, Rear-arc vs. arc-front volcanoes in the Katmai reach of the Alaska Peninsula: a critical apprasial of across-arc compositional variation: Contributions to Mineralogy and Petrology, v. 147, n. 3, p. 243-275.

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