Integrated tephrochronology of the West Antarctic region: Implications for a potential tephra record in the West Antarctic Ice Sheet (WAIS) Divide ice core
ashfall generating eruptions over the past 500,000 yrs. These eruptions dispersed volcanic ash over large areas of the West Antarctic ice sheet. Evidence of these eruptions is observed at two blue ice sites (Mt. Waesche and Mt. Moulton) as well as in the Siple Dome and Byrd (Palais et al., 1988) ice...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.6219 http://geoinfo.nmt.edu/staff/dunbar/publications/documents/dunbar_mcintosh_kurbatov_wilch_2007_isaes.pdf |
| Summary: | ashfall generating eruptions over the past 500,000 yrs. These eruptions dispersed volcanic ash over large areas of the West Antarctic ice sheet. Evidence of these eruptions is observed at two blue ice sites (Mt. Waesche and Mt. Moulton) as well as in the Siple Dome and Byrd (Palais et al., 1988) ice cores. Geochemical correlations between tephra sampled at the source volcanoes, at blue ice sites, and in the Siple Dome ice core suggest that at least some of the eruptions covered large areas of the ice sheet with a volcanic ash, and 40Ar/39Ar dating of volcanic material provides precise timing when these events occurred. Volcanic ash from some of these events expected to be found in the WAIS Divide ice core, providing chronology and inter-site correlation. |
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