CONTRIBUTIONS OF AN ANCIENT EVAPORITIC-TYPE RESERVOIR TO SUBGLACIAL LAKE VOSTOK CHEMISTRY

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dc.contributor.author De Angelis M.
dc.contributor.author Petit J.-R.
dc.contributor.author Savarino J.
dc.contributor.author Souchez R.
dc.contributor.author Thiemens M.H.
dc.date.accessioned 2022-08-27T05:01:05Z
dc.date.available 2022-08-27T05:01:05Z
dc.date.issued 2004
dc.identifier https://www.elibrary.ru/item.asp?id=14425019
dc.identifier.citation Earth and Planetary Science Letters, 2004, 222, 3-4, 751-765
dc.identifier.issn 0012-821X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/38585
dc.description.abstract We present here the first comprehensive study of the chemical composition of accretion ice from Lake Vostok. Ion chromatographic analyses were performed on samples obtained along the deeper part of the Vostok ice core. Samples were taken from 3350 down to 3611 m depth, both in glacier ice and subglacial lake ice. The total ionic contents of two accretion ice layers—a few meters thick and centered around 3540 and 3590 m depth—are several times lower than those of glacier ice. Very low concentrations were also observed in the deeper part of accretion ice, below 3609 m depth. Elsewhere, the total ionic content is variable but remains 5 to 50 times higher than in glacier ice. Whatever its total ionic content, the ionic composition of accretion ice is significantly different from what is observed in glacier ice. It is dominated by sodium chloride, homogeneously distributed throughout the ice lattice, as well as calcium and magnesium sulfate, likely located in solid inclusions, or to a lesser extent at grain boundaries. Chemical considerations combined with additional studies of sulfur and oxygen isotopes in sulfate, and iron measurements strongly suggest that glacier water recycling and bedrock hydrolysis do not play a prominent role in providing impurities to accretion ice. It is more likely that NaCl rich water carrying fine sulfate salt particles is sporadically incorporated in the ice accreting in a shallow bay upstream from Vostok. The origin of such salty water, which should also contribute to Lake salinity, is discussed.
dc.subject Antarctica
dc.subject Lake Vostok
dc.subject accretion ice
dc.subject ice composition
dc.title CONTRIBUTIONS OF AN ANCIENT EVAPORITIC-TYPE RESERVOIR TO SUBGLACIAL LAKE VOSTOK CHEMISTRY
dc.type Статья


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