Chemical Changes of Lakes Within the Mount St. Helens Blast Zone

Differences in the dissolved chemistry of lakes devastated by the 18 May 1980 eruption of Mount St. Helens are attributable to location relative to the lateral blast trajectory of the eruption and to the emplacement of mineral deposits. Elemental enrichment ratios of pre- and posteruption measuremen...

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Bibliographic Details
Published in:Science
Main Authors: Wissmar, Robert C., Devol, Allen H., Nevissi, Ahmad E., Sedell, James R.
Format: Article in Journal/Newspaper
Language:English
Published: American Association for the Advancement of Science (AAAS) 1982
Subjects:
Spirit Lake
Carbonic acid
Online Access:http://dx.doi.org/10.1126/science.216.4542.175
https://www.science.org/doi/pdf/10.1126/science.216.4542.175
Description
Summary:Differences in the dissolved chemistry of lakes devastated by the 18 May 1980 eruption of Mount St. Helens are attributable to location relative to the lateral blast trajectory of the eruption and to the emplacement of mineral deposits. Elemental enrichment ratios of pre- and posteruption measurements for Spirit Lake and comparisons of the chemical concentrations and elemental ratios for lakes inside and outside the blast zone reflect the influences of the dissolution of magmatic and lithic deposits. The p H changes were minor because of buffering by carbonic acid and reactions involving mineral alteration, dissolved organics, and biological processes.

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