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- W2123234884 abstract "Ice and speleothems are widely regarded as mutually exclusive as the presence of liquid water is a fundamental prerequisite for speleothem deposition. Here we show that speleothems may form in caves overlain by a glacier, as long as the temperature in the cave is above freezing and the conduits are not completely flooded by melt water. Carbonate dissolution is accomplished via sulfide oxidation and the resultant speleothems show high δ13C values approaching and locally exceeding those of the parent host rock (lack of soil-derived biogenic C). The δ18O values reflect the isotopic composition of the melt water percolating into the karst fissure network and carry an atmospheric (temperature) signal, which is distinctly lower than those of speleothems formed during periods when soil and vegetation were present above the cave. These ‘subglacial’ speleothems provide a means of identifying and dating the former presence of warm-based paleoglaciers and allow us to place some constraints on paleotemperature changes." @default.
- W2123234884 created "2016-06-24" @default.
- W2123234884 creator A5015889339 @default.
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- W2123234884 date "2007-02-01" @default.
- W2123234884 modified "2023-10-16" @default.
- W2123234884 title "Speleothems and paleoglaciers" @default.
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- W2123234884 doi "https://doi.org/10.1016/j.epsl.2006.11.041" @default.
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