Ice Core Drilling on Mt. Wrangell, Alaska 1982,
ALASKA UNIV FAIRBANKS GEOPHYSICAL INST
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Glacier ice in the summit caldera of Mt. Wrangell 62 deg N 144 W, 4000 m above sea level has a mean annual temperature of about -20 C, an annual accumulation of 1 to 1.3 m water equivalent and thicknesses on the order of 500 m. This paper deals with a pilot project, done in 1982, using the PICO lightweight drill which performed very well. We obtained 43.5 m of core which is being analyzed for microparticle content, total beta activity and stable isotope O18O16 ratios. The light weight was a major asset in transporting the drill by helicopter to the summit and in moving it by sledge on the surface. It was easy for one man to raise and lower the drill to depths of 30 m. At a depth of about 40 m the time required for an individual roundtrip run to retrieve core was 45 minutes. Core lengths greater than 1 m were common when using the 2 m core barrel and core quality was excellent.