Multiple cosmogenic nuclides document the stability of the East Antarctic Ice Sheet in northern Victoria Land since the Late Miocene (5-7 Ma)

作者: Luigia Di Nicola , Carlo Baroni , Stefan Strasky , Maria Cristina Salvatore , Christian Schlüchter

DOI: 10.1016/J.QUASCIREV.2012.09.026

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摘要: The timing and amplitude of changes in the Antarctic ice level are relevant to understanding past climate fluctuations ongoing global sea levels. In this study, we present surface exposure ages based on situ produced cosmogenic 10Be 21Ne bedrock samples glacially eroded relict surfaces from Deep Freeze Range, northern Victoria Land. proximity region East Ice Sheet indicates that area is sensitive variations inland volume, permitting investigation behavioural relationship between alpine glacial system Dating erosional provides a precise chronology Land paleoclimate evolution allows us correlate response events local variations. concentrations highest peaks Range strongly indicate landscape features were continuously exposed for 5–7 Ma. Denudation rates inferred our data show erosion rate summits has been extremely low (∼5 cm/Ma) at least Along with evidence persistent stability (cold arid conditions) other sectors Transantarctic Mountains, results transition wet-based cold-based regime occurred after creation polar Middle Miocene.

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