Rainbow River cone


Facts


  • Official Name:
  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1213m (3979ft)
  • Latitude: 58.49944
  • Longitude: -154.68177
  • Smithsonian VNum:
  • Nearby Towns:
    • Karluk 65 mi (104 km) SE
    • Kokhanok 65 mi (105 km) NW
    • Larsen Bay 71 mi (115 km) SE
    • King Salmon 72 mi (117 km) NW
    • Igiugig 72 mi (115 km) NW

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] : "Rainbow River Cone (Peak 3980) is a small basaltic volcano (51.8-53% SiO2) perched on a basement ridge east of Rainbow River, 15 km NW of Mount Denison. The glacially sculpted cone, 1 km wide with 330 m relief, consists of radially dipping stacks of thin lavas and breccia sheets intercalated with scoria falls, well exposed on bounding cliffs, cut by numerous dikes, and gutted by a northerly cirque. Lavas and ejecta contain phenocrysts of plagioclase, orthopyroxene, clinopyroxene, olivine, and Fe-Ti oxides. An ice-scoured lava plateau (390 +/- 39 ka) extends 1 km SE from the cone."

Name Origin

"Rainbow River cone" is an informal name, after the nearby Rainbow River given by Hildreth and others (2004). The Rainbow River was named by R.H. Sargent's party in 1923 "because six rainbows were seen there" (Orth, 1971).


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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