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Strontium Isotopic Signatures of Streams from Taylor Valley, Antarctica, Revisited: The Role of Carbonate Mineral Dissolution
Authors:Carolyn B Dowling  W B Lyons  Kathleen A Welch
Institution:1. Department of Geological Sciences, Ball State University, 2000 West University Ave, Muncie, IN, 47306, USA
2. School of Earth Sciences, Ohio State University, 125 South Oval Mall, Columbus, OH, 43210, USA
3. Byrd Polar Research Center, Ohio State University, 1090 Carmack Road, Columbus, OH, 43210, USA
Abstract:We have collected and analyzed a larger set of stream waters for major ions and strontium isotopes in Taylor Valley, McMurdo Dry Valleys, Antarctica. These new data substantiate the concept that the dissolution of carbonate minerals is a significant source of strontium, even in polar desert environments where liquid water is primarily limited to stream channels. In Taylor Valley, most of the carbonate minerals present are the result of secondary processes, such as mineral precipitation and/or eolian deposition, and not through primary geologic sources, such as bedrock or till sources. In Von Guerard Stream (Lake Fryxell basin) and Andersen Creek (Lake Hoare basin), water samples were collected during the austral summer to determine short-term 87Sr/86Sr patterns. The observed variability in both time and space may be dependent on the relative amounts of primary and secondary carbonates present in the streambeds and hyporheic zone as well as contingent on the relative proportions of carbonate and aluminosilicate weathering.
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