Abstract
Controlled sublimation in a low-vacuum scanning electron microscope has been used to reveal unusual crystalline features in the triple junctions of accretion ice from the Antarctic ice sheet above Lake Vostok. Energy dispersive X-ray microanalysis showed that the features were composed mostly of magnesium, sulfur and oxygen, although small amounts of sodium and calcium were also occasionally observed. Synchrotron X-ray topography showed that the ice grains contained dislocation densities ranging from ∼1×10 7 to >1×10 10 m −2.
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