Trace Element Composition of the Mount St. Helens Plume: Stratospheric Samples from the 18 May Eruption

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Science  20 Feb 1981:
Vol. 211, Issue 4484, pp. 827-830
DOI: 10.1126/science.211.4484.827


Atmospheric particulate material collected from the stratosphere in the plume of the 18 May 1980 eruption of the Mount St. Helens volcano was quite similar in composition to that of ash that fell to the ground in western Washington. However, there were small but significant differences in concentrations of some elements with altitude, indicating that the stratospheric material was primarily produced from fresh magma, not fragments of the mountain.