Jumbo Dome - Introduction

LOCATION

FACTS

Official Name:	Jumbo Dome
Type:	A large cylindrical plug of hornblende andesite
Most Recent Activity:
Seismically Monitored:	No
Elevation:	4491 ft (1369 m)
Latitude:	63.975° N
Longitude:	148.69444° W
Quadrangle:	Healy
CAVW Number:	315802
Pronunciation:	Sound file
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 Anchorage 194 mi (313 km) SW

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.

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Mary, 1980, The geology of three extrusive bodies in the Central Alaska Range: University of Alaska Fairbanks unpublished M.S. thesis, 104 p.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

Contact AVO Privacy Accessibility Information Quality FOIA

URL: avo.alaska.edu/volcanoes/volcinfo.php
Page modified: September 29, 2020 12:19
Contact Information: AVO Web Team

@alaska_avo

alaska.avo

Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.

Jumbo Dome description and information