Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212501d&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 12, CiteID L12501
Other
3
Biogeosciences: Hydrothermal Systems (1034, 3017, 3616, 4832, 8135, 8424), Hydrology: Reservoirs (Surface), Paleoceanography: Ice Cores (0724), Geographic Location: Antarctica (4207), Geographic Location: Large Bodies Of Water (E.G., Lakes And Inland Seas) (0746)
Scientific paper
Lake Vostok, the largest Antarctic sub-glacial lake (14,000 km2), lies beneath nearly 4 km of ice. Sub-glacial geophysical observations and studies of ice accreting at the lake-glacier interface are the only means available to obtain information on the environment and dynamics of this huge water body formed several million years ago. Accretion ice has been studied using high-resolution synchrotron X-Ray micro-fluorescence. For the first time, liquid brine micro-droplets (3-10 μm) are observed, coexisting with large irregular sulfur-rich aggregates (10-800 μm) containing gases and a mixture of very fine particles. Most of these objects are sequestered inside large crystals that grew slowly after ice formation. Their structure and composition support the existence of hydrothermal activity at the lake bottom and the occurrence of haline water pulses carrying fine solid debris and eventually biota from a deeper evaporitic reservoir into the lake.
Barnola Jean-Marc
de Angelis Martine
Duval Paul
Morel-Fourcade Marie-Christine
Susini Jean
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