Jumbo Dome 1026000 yBP
Start: 1026000 yBP ± 57000 Years [1]
Event Type: Explosive
Description: From Cameron and others (2015): "Jumbo Dome is a hornblende andesite dome of Pleistocene age located in the Healy Quadrangle of central Alaska, about 19 km northeast of Healy (Albanese, 1980; Athey and others, 2006) (fig. 1, 2, 3 [in original text]). Jumbo Dome is approximately 1.6 km long, 1.3 km wide, and 500 m high and intrudes the Devonian Keevy Peak Formation basement (slate, quartz-sericite schist, graphitic schist, calcareous schist, quartz-feldspar metawacke, and conglomerate) and overlying Tertiary Suntrana Formation (sandstone, clay, and coal) (Albanese, 1980; Wahrhaftig and others, 1969). A single 40Ar/39Ar date of a sample from Jumbo Dome yielded a plateau age of 1.026+/-0.057 Ma (Athey and others, 2006)."
References Cited
[1] 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.[2] Jumbo Dome, Interior Alaska: Whole-rock, major- and trace-element analyses, 2015
Cameron, C.E., Nye, C.J., Bull, K.F., and Woods, Rebecca-Ellen, 2015, Jumbo Dome, Interior Alaska: Whole-rock, major- and trace-element analyses: Alaska Division of Geological & Geophysical Surveys Raw Data File 2015-14, 3 p. doi:10.14509/29520
Complete Eruption References
Jumbo Dome, Interior Alaska: Whole-rock, major- and trace-element analyses, 2015
Cameron, C.E., Nye, C.J., Bull, K.F., and Woods, Rebecca-Ellen, 2015, Jumbo Dome, Interior Alaska: Whole-rock, major- and trace-element analyses: Alaska Division of Geological & Geophysical Surveys Raw Data File 2015-14, 3 p. doi:10.14509/29520
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.