Jumbo Dome

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Facts

Official Name: Jumbo Dome
Seismically Monitored: No
Color Code: UNASSIGNED
Alert Level: UNASSIGNED
Elevation: 1369m (4491ft)
Latitude: 63.975
Longitude: -148.69444
Smithsonian VNum:
Pronunciation:
Nearby Towns:
- Ferry 9 mi (14 km) NW
- Healy 12 mi (19 km) SW
- Denali Borough 12 mi (19 km) SW
- McKinley Park 18 mi (29 km) SW
- Anderson 30 mi (47 km) NW

Description

From Albanese (1980)^[1]: "Jumbo Dome is a large cylindrical plug of hornblende andesite 1.6 km long, 1.3 km wide, and 500 m high which intrudes the Devonian Keevy Peak Formation basement and overlying Tertiary Suntrana Formation." Ar/Ar dating by Athey and others (2006)^[2] yields an age for Jumbo Dome of 1.026 +/- 0.057 Ma.

Name Origin

"Jumbo Dome" is a local name reported in 1906 by L.M. Prindle (Orth, 1971).

References Cited

[1] The geology of three extrusive bodies in the Central Alaska Range, 1980

Albanese, Mary, 1980, The geology of three extrusive bodies in the Central Alaska Range: University of Alaska Fairbanks unpublished M.S. thesis, 104 p.

[2] Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska, 2006

Athey, J.E., Newberry, R.J., Werdon, M.B., Freeman, L.K., Smith, R.L., and Szumigala, D.J., 2006, Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2006-2 v. 1.0.1, 98 p., 1 sheet, scale 1:50,000.

Alaska Volcano Observatory

Jumbo Dome

Facts

Description

Name Origin

References Cited

[1] The geology of three extrusive bodies in the Central Alaska Range, 1980

[2] Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska, 2006

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