Rocks beneath Antarctic IceSheet reveal surprising past BAS_News
We conducted the survey with a ski-towed radar system consisting of a Geophysical Survey Systems, Inc. SIR 4000 control unit and model 3108 100 MHz monostatic transceiver, coupled to a Garmin GPSMap 78 handheld GPS unit. We also installed a series of snow stakes in a 70 m100 m grid with 10 m spacing overlying the subglacial ridge and marked these stakes on radar profiles collected along grid lines . This provided higher-resolution spatial referencing than possible using the GPS alone.
We collected subglacial bedrock samples using a two-stage drilling process. First, we made an access hole through the ice, extending as close as possible to the bedrock surface, using a Badger-Eclipse cable-suspended ice core drill, which produces a 113 mm borehole. Drilling with this system stopped when the sediment concentration in basal ice became high enough to dull the cutting bit and halt progress. We then occupied the access hole with a “Winkie” pipe-string, normal circulation compact rock coring drill, modified for polar use by the US Ice Drilling Program
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