Mount St. Helens Ash from the 18 May 1980 Eruption: Chemical, Physical, Mineralogical, and Biological Properties

  title={Mount St. Helens Ash from the 18 May 1980 Eruption: Chemical, Physical, Mineralogical, and Biological Properties},
  author={Jonathan S. Fruchter and Diane E. Robertson and J. Catherine Evans and Khris B. Olsen and Elwood A. Lepel and Jagdish C Laul and Keith H. Abel and Roger W. Sanders and P. O. Jackson and N S Wogman and Richard W. Perkins and H H VAN Tuyl and Raymond H. Beauchamp and J. W. Shade and J. Leland Daniel and Raymond Leo Erikson and George A. Sehmel and R. N. Lee and Allan Robinson and Owen R. Moss and James K. Briant and William C. Cannon},
  pages={1116 - 1125}
Samples of ash from the 18 May 1980 eruption of Mount St. Helens were collected from several locations in eastern Washington and Montana. The ash was subjected to a variety of analyses to determine its chemical, physical, mineralogical, and biological characteristics. Chemically, the ash samples were of dacitic composition. Particle size data showed bimodal distributions and differed considerably with location. However, all samples contained comparable amounts of particles less than 3.5… 
Leaching characteristics of ash from the May 18, 1980, eruption of Mount St. Helens volcano, Washington
Leaching of freshly erupted air-fall ash, unaffected by rain, from the May 18, 1980, eruption of Mount St. Helens volcano, Washington, shows that Ca2+, Na+, Mg2+, SO42−, and Cl− are the predominant
Surface and Elemental Properties of Mount St. Helens Volcanic Ash
Sized fractions of Mount St. Helens volcanic ash were examined by SEM, EDXA, and ESCA. Particle size distributions, density, and specific surface area were determined. The size distribution was
Compositional heterogeneity of tephras from the 1980 eruptions of Mount St. Helens
Samples collected at hourly intervals on May 18–19, 1980, at three sites 200 km downwind from Mount St. Helens, have made possible a detailed reconstruction of the conditions that contribute to the
Influence of particle aggregation on deposition of distal tephra from the MAy 18, 1980, eruption of Mount St. Helens volcano
The May 18, 1980, eruption of Mount St. Helens (MSH) produced an extensive ashfall deposit in Washington, Idaho, and Montana with a minumum volume of 0.55 km3 (tephra). An unusual feature of the
Genesis of zeolites in the Neapolitan Yellow Tuff: geological, volcanological and mineralogical evidence
Abstract The study proposes a model by which a thick succession of volcanic tuffs can be zeolitized by alteration of pyroclastic material in the presence of sufficient eruptive water and at
Comparative in vitro cytotoxicity of volcanic ashes from Mount St. Helens, El Chichon, and Galunggung.
Results indicate that volcanic ash is moderately cytotoxic and that exposure may lead to overt reactions and the exacerbation of preexisting chronic inflammatory processes.
The Dorothy bentonite: an extraordinary case of secondary thickening in a late Campanian volcanic ash fall in central Alberta
The late Campanian (~73 Ma) Dorothy bentonite outcrops in the marine Bearpaw Shale for 20 km along the Red Deer River valley east of Drumheller, Alberta, and is up to 13.5 m thick. An isopach map


Morphology and Petrography of Volcanic Ashes
Volcanic ash samples collected from a variety of recent eruptions were studied using petrography, chemical analyses, and scanning electron microscopy to characterize each ash type and to relate ash
Average chemical compositions are given for the common plutonic rock types and their volcanic equivalents. An attempt has been made also to give the general average chemical compositions of silicic,
The Neutralization of Silica Toxicity in vitro
  • J. Marks
  • Chemistry
    British journal of industrial medicine
  • 1957
Several compounds known to react with heparin were examined to see if they would neutralize silica toxicity, and a recently discovered and unusually active substance, compound 48/80, proved to be of great interest.
It is suggested that repeated cycles of macrophage killing in vivo leads to the mobilization of fibroblasts and fibrogenesis characterizing the disease silicosis.
Haemolytic Activity of Asbestos and other Mineral Dusts
It is shown that chrysotile asbestos is as potent a haemolytic agent as silica powder, and other forms of asbestos lysed erythrocytes only after prolonged incubation with them, and a wide range of mineral dusts was inactive.
Activity of a Macrophage Factor in Collagen Formation by Silica
There is a correlation between the toxicity of various forms of silica and of other particulate materials to macrophages in culture and the capacity of these particles to stimulate fibrosis in vivo, but this relationship does not seem to have been demonstrated directly in tissue culture.
Pacific Northwest Laboratory
  • Pacific Northwest Laboratory Annual Report for 1977 to the DOE Assistant Secretary for the Environment, Atmospheric Sciences
  • 1976