Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica

Deborah Leslie, W. Berry Lyons, Nathaniel Warner, Avner Vengosh, John Olesik, Kathleen Welch, Kelly Deuerling

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The geochemistry of boron was investigated in the ice-covered lakes and glacier meltwater streams within Taylor and Wright Valley of the McMurdo Dry Valleys (MCM), Antarctica, in order to achieve a greater understanding of the source of boron to these aquatic systems and how in-lake processes control boron concentration. Selected lake depths (surface and bottom water) and streams were analyzed for boron geochemistry. Boron stable isotope values in these waters span the range of +12.3‰ to +51.4‰, which corresponds to the variations from glacier meltwater streams to the hypolimnion of a highly evaporated hypersaline lake. The data demonstrate that the major sources of B to the aquatic system are via terrestrial chemical weathering of aluminosilicates within the stream channels, and a marine source, either currently being introduced by marine-derived aerosols or in the form of ancient seawater. Lakes Fryxell, Hoare, and upper waters of Lake Joyce, which experience more terrestrial influence of aluminosilicate chemical weathering via glacial meltwater streams, display a mixture of these two major sources, while the source of B in the bottom waters of Lake Joyce appears to be primarily of marine origin. Lakes Bonney and Vanda and the Blood Falls brine have a marine-like source whose δ11B values have become more positive by mineral precipitation and/or adsorption. Don Juan Pond displays a terrestrial aluminosilicate influence of a marine-like source. These hypersaline lake waters from Antarctica are similar in δ11B to other hypersaline lake waters globally, suggesting that similar processes control their B geochemistry.

Original languageEnglish (US)
Pages (from-to)152-164
Number of pages13
JournalChemical Geology
Volume386
DOIs
StatePublished - Oct 29 2014

Fingerprint

Boron
Geochemistry
boron
Lakes
geochemistry
valley
lake
aluminosilicate
meltwater
Water
chemical weathering
bottom water
lake water
Glaciers
glacier
Weathering
boron isotope
ice lake
Process control
hypolimnion

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

Cite this

Leslie, D., Berry Lyons, W., Warner, N., Vengosh, A., Olesik, J., Welch, K., & Deuerling, K. (2014). Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica. Chemical Geology, 386, 152-164. https://doi.org/10.1016/j.chemgeo.2014.08.016
Leslie, Deborah ; Berry Lyons, W. ; Warner, Nathaniel ; Vengosh, Avner ; Olesik, John ; Welch, Kathleen ; Deuerling, Kelly. / Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica. In: Chemical Geology. 2014 ; Vol. 386. pp. 152-164.
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Leslie, D, Berry Lyons, W, Warner, N, Vengosh, A, Olesik, J, Welch, K & Deuerling, K 2014, 'Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica', Chemical Geology, vol. 386, pp. 152-164. https://doi.org/10.1016/j.chemgeo.2014.08.016

Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica. / Leslie, Deborah; Berry Lyons, W.; Warner, Nathaniel; Vengosh, Avner; Olesik, John; Welch, Kathleen; Deuerling, Kelly.

In: Chemical Geology, Vol. 386, 29.10.2014, p. 152-164.

Research output: Contribution to journalArticle

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T1 - Boron isotopic geochemistry of the McMurdo Dry Valley lakes, Antarctica

AU - Leslie, Deborah

AU - Berry Lyons, W.

AU - Warner, Nathaniel

AU - Vengosh, Avner

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AU - Welch, Kathleen

AU - Deuerling, Kelly

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N2 - The geochemistry of boron was investigated in the ice-covered lakes and glacier meltwater streams within Taylor and Wright Valley of the McMurdo Dry Valleys (MCM), Antarctica, in order to achieve a greater understanding of the source of boron to these aquatic systems and how in-lake processes control boron concentration. Selected lake depths (surface and bottom water) and streams were analyzed for boron geochemistry. Boron stable isotope values in these waters span the range of +12.3‰ to +51.4‰, which corresponds to the variations from glacier meltwater streams to the hypolimnion of a highly evaporated hypersaline lake. The data demonstrate that the major sources of B to the aquatic system are via terrestrial chemical weathering of aluminosilicates within the stream channels, and a marine source, either currently being introduced by marine-derived aerosols or in the form of ancient seawater. Lakes Fryxell, Hoare, and upper waters of Lake Joyce, which experience more terrestrial influence of aluminosilicate chemical weathering via glacial meltwater streams, display a mixture of these two major sources, while the source of B in the bottom waters of Lake Joyce appears to be primarily of marine origin. Lakes Bonney and Vanda and the Blood Falls brine have a marine-like source whose δ11B values have become more positive by mineral precipitation and/or adsorption. Don Juan Pond displays a terrestrial aluminosilicate influence of a marine-like source. These hypersaline lake waters from Antarctica are similar in δ11B to other hypersaline lake waters globally, suggesting that similar processes control their B geochemistry.

AB - The geochemistry of boron was investigated in the ice-covered lakes and glacier meltwater streams within Taylor and Wright Valley of the McMurdo Dry Valleys (MCM), Antarctica, in order to achieve a greater understanding of the source of boron to these aquatic systems and how in-lake processes control boron concentration. Selected lake depths (surface and bottom water) and streams were analyzed for boron geochemistry. Boron stable isotope values in these waters span the range of +12.3‰ to +51.4‰, which corresponds to the variations from glacier meltwater streams to the hypolimnion of a highly evaporated hypersaline lake. The data demonstrate that the major sources of B to the aquatic system are via terrestrial chemical weathering of aluminosilicates within the stream channels, and a marine source, either currently being introduced by marine-derived aerosols or in the form of ancient seawater. Lakes Fryxell, Hoare, and upper waters of Lake Joyce, which experience more terrestrial influence of aluminosilicate chemical weathering via glacial meltwater streams, display a mixture of these two major sources, while the source of B in the bottom waters of Lake Joyce appears to be primarily of marine origin. Lakes Bonney and Vanda and the Blood Falls brine have a marine-like source whose δ11B values have become more positive by mineral precipitation and/or adsorption. Don Juan Pond displays a terrestrial aluminosilicate influence of a marine-like source. These hypersaline lake waters from Antarctica are similar in δ11B to other hypersaline lake waters globally, suggesting that similar processes control their B geochemistry.

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