TY - JOUR
T1 - Geochemical precursors to volcanic activity at Mount St. Helens, USA
AU - Berlo, Kim
AU - Blundy, Jon
AU - Turner, Simon
AU - Cashman, Kathy
AU - Hawkesworth, Chris
AU - Black, Stuart
PY - 2004/11/12
Y1 - 2004/11/12
N2 - 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 geochemical 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.
AB - 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 geochemical 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.
UR - http://www.scopus.com/inward/record.url?scp=8444235038&partnerID=8YFLogxK
U2 - 10.1126/science.1103869
DO - 10.1126/science.1103869
M3 - Article
C2 - 15486253
AN - SCOPUS:8444235038
VL - 306
SP - 1167
EP - 1169
JO - Science (New York, N.Y.)
JF - Science (New York, N.Y.)
SN - 0036-8075
IS - 5699
ER -