Compositions of three tephra layers from the byrd station ice core, antarctica

Volcanic glass shards from three tephra layers at 788, 1457, 1711 m depth in the 2164-m Byrd Station ice core from the West Antarctic Ice Sheet were analysed by electron microprobe. Glass shards within each tephra layer are homogeneous and have peralkaline trachyte compositions. Mt. Takahe, 450 km north-northwest of the drill site is considered the most likely eruptive source, although Toney Mountain, 460 km to the north is also a possible source. Tephra layers in ice cores from the West Antarctic ice sheet may offer a valuable tool for stratigraphic correlation.