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Geochemical precursors to volcanic activity at Mount St. Helens, USA

Berlo, K., Blundy, J., Turner, S., Cashman, K., Hawkesworth, C. and Black, S. (2004) Geochemical precursors to volcanic activity at Mount St. Helens, USA. Science, 306 (5699). pp. 1167-1169. ISSN 0036-8075

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To link to this article DOI: 10.1126/science.1103869

Abstract/Summary

The importance of the interplay between degassing and crystallization before and after the eruption of Mount St. Helens (Washington, USA) in 1980 is well established. Here, we show that degassing occurred over a period of decades to days before eruptions and that the manner of degassing, as deduced from geochemicai signatures within the magma, was characteristic of the eruptive style. Trace element (lithium) and short-lived radioactive isotope (lead-210 and radium-226) data show that ascending magma stalled within the conduit, leading to the accumulation of volatiles and the formation of lead-210 excesses, which signals the presence of degassing magma at depth.

Item Type:Article
Divisions:Faculty of Science > School of Archaeology, Geography and Environmental Science > Department of Archaeology
Faculty of Science > School of Archaeology, Geography and Environmental Science > Scientific Archaeology
ID Code:3262
Uncontrolled Keywords:CRYSTALLIZATION DIFFUSION ERUPTIONS DYNAMICS ASCENT DACITE MAGMAS
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