Filters: Tags: Jumbo Dome (X)
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Report of Investigation 2006-2, "Bedrock geologic map of the Liberty Bell area, Fairbanks A-4 Quadrangle, Bonnifield mining district, Alaska," is the bedrock geologic map of an approximately 131-square-mile area surrounding the Liberty Bell Mine. The geology of the Liberty Bell area, located in the northern Alaska Range foothills, comprises Devonian metasedimentary and meta-igneous rocks of the Totatlanika Schist and Keevy Peak formations, Cretaceous and Tertiary igneous rocks, and overlying unconsolidated Tertiary sedimentary rocks of the Usibelli Group and the younger Nenana Gravel.
Jumbo Dome is a hornblende andesite dome of Pleistocene age located in the Healy Quadrangle of central Alaska, about 19 km northeast of Healy, Alaska. 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). Jumbo Dome is not well studied and these samples plus the three analyses from Albanese (1980) represent the known total of published whole-rock geochemical analyses for this volcanic feature. Jumbo Dome lava has the diagnostic arc signature of low ratios of concentrations...
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