2019
DOI: 10.1017/s0954102019000129 View full text |Buy / Rent full text
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Abstract: Reliably dated surficial deposits for reconstructing palaeoclimate are rare in the McMurdo Dry Valleys of Antarctica. While many tephra have been found and dated, none is well characterized. In the Wright Valley, the Hart Ash is poorly dated and described. This paper reports profiles through tephra, the chemical signature of the glass shards and new high-precision multi-crystal laser fusion of 40Ar/39Ar ages. Major and trace element analyses of glass shards indicate the tephra are phonolitic and most probably … Show more

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“…Emplacement of ground ice in the upper MDV sediment has therefore been occurring well after the closure age of 6.0 Ma. Throughout the MDV, 10 Be met concentrations decrease by one or two orders of magnitude immediately below the surface (Figs 5.4 and 5.7) and suggest that the amount of liquid water has been insufficient to translocate 10 Be met for at least 2.97 Ma (reviewed age of Hart Ash; Schiller et al, 2009Schiller et al, , 2019. It is therefore likely that the water present in the upper MDV under modern conditions is limited to thin liquid films.…”
Section: Timing Of Water Percolation and Onset Of Polar Ariditymentioning
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“…Emplacement of ground ice in the upper MDV sediment has therefore been occurring well after the closure age of 6.0 Ma. Throughout the MDV, 10 Be met concentrations decrease by one or two orders of magnitude immediately below the surface (Figs 5.4 and 5.7) and suggest that the amount of liquid water has been insufficient to translocate 10 Be met for at least 2.97 Ma (reviewed age of Hart Ash; Schiller et al, 2009Schiller et al, , 2019. It is therefore likely that the water present in the upper MDV under modern conditions is limited to thin liquid films.…”
Section: Timing Of Water Percolation and Onset Of Polar Ariditymentioning
“…Emplacement of ground ice in the upper MDV sediment has therefore been occurring well after the last infiltration of 10 Be met at 6.0 Ma, but the amount of liquid water has been insufficient to translocate 10 Be met in the sediment column for at least 2.97 Ma (e.g. Schiller et al, 2009Schiller et al, , 2019. Given that the soluble salts geochemistry at Friis Hills was similar to sea water and that the NaCl eutectic point is ∼-23°C, a reasonable amount of unfrozen water may persist down to at least -23°C, which is the modern-day MAAT at the surface.…”
Section: Modern Hyper-arid Conditions (60 Ma-present)mentioning