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Palaeoenvironmental reconstructions and 40Ar/39Ar geochronology of volcanism at Mt. Murphy and the Crary Mountains in eastern Marie Byrd Land (MBL), West Antarctica, provide records of changing ice levels of the West Antarctic Ice Sheet (WAIS) since the late Miocene. Interpretations of eruptive and depositional environments are based on lithofacies studies and indicate whether the volcanoes erupted below, near or above the level of the ice sheet. Seventy-seven new 40Ar/39Ar dates offer a precise chronological framework for the ice volcanic history.

Late Miocene (9–8 Ma) basal volcanic sequences at Mt. Murphy and the Crary...

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