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Correlation of Volcanic Ash Deposits by Activation Analysis of Glass Separates1

Published online by Cambridge University Press:  20 January 2017

R. A. Schmitt
Affiliation:
Former Graduate Research Assistant, presently NRC Postdoctoral Research Associate, U.S. Geological Suryey, Denver Federal Center, Denver, Colorado, Professors in the Departments of Soils and of Chemistry, Oregon State University, respectively

Abstract

Volcanic ash deposits whose source is the Cascade Mountains area were correlated on the basis of 19 elemental abundances obtained by instrumental neutron activation analysis (INAA). After activation of glassy separates in a TRIGA reactor, gammaray spectra were obtained and analyzed with computer programs. The elements Na, Sm, Sc, Fe, Ce, Hf, and Th were determined with relative standard deviations less than 5%; the precision for La, Co, Eu, Yb, Cs, Ba, and Lu was less than 17%; larger errors were obtained for Rb, Ta, Nd, Tb, and Cr. A statistical method was developed for correlation on the basis of relative elemental compositions unique to the ash deposits. Elemental abundances of Mazama glassy separates were independent of distance from the source. The site to site chemical variability of crystal rich Glacier Peak and St. Helens ash layers was greater than for Mazama and Newberry ashes. The Rb, Yb, Lu, Th, and Ta contents in Newberry glass were more than twice those in Mazama glass. The concentrations of trace elements in Glacier Peak and St. Helens ashes generally were less than one-half those in Mazama glass. The presence of Mazama ash has been confirmed at sites in Oregon, Washington, Alberta, and in sediments of the Pacific Ocean.

Type
Original Articles
Copyright
University of Washington

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Footnotes

1

Technical Paper No. 2901, Oregon Agricultural Experiment Station, Corvallis, Oregon. Supported in part by AEC contract AT (45-1) 2062.

References

Allison, I. S. (1966). “Fossil Lake Oregon: Its geology and fossil faunas.” Oregon State University. Corvallis, Oregon 48 pp.Google Scholar
Borchardt, G. A. (1970). Neutron activation analysis for correlating volcanic ash soils. Ph.D. thesis. Oregon State University, Corvallis, Oregon. 219 numb. leaves. (Diss. Abstr., 30, No. 11, Pub. No. 707917).Google Scholar
Borchardt, G. A., Hoagland, G. W., and Schmitt, R. A. (1970). SPECTRA: A computer program for gamma-ray analysis. Journal of Radioanalytical Chemistry 6, 241271.Google Scholar
Chichester, F. W. (1967). Clay mineralogy and related chemical properties of soils formed on Mazama pumice. Ph.D. thesis. Oregon State University, Corvallis, Oregon. 152 numb. leaves. (Diss. Abstr., 27, 3749B).Google Scholar
Crandell, D. R., Mullineaux, D. R., Miller, R. D., and Rubin, M. (1962). Pyroclastic deposits of Recent age at Mount Rainier, Washington. U. S.. Geological Survey Professional Paper 450-D, D64D68.Google Scholar
Czamanske, G. K., Porter, S. C. (1965). Titanium dioxide in pyroclastic layers from volcanoes in the Cascade Range. Science 150, 10221025.Google Scholar
Dixon, W. J. (1968). Biomedical computer programs. University of California Publication in Automatic Computation No. 2. University of California Press, Los Angeles. 214a214t.Google Scholar
Doak, W. H. (1969). A qualitative and quantitative characterization of porosity in volcanic ash. M.S. thesis. Oregon State University, Corvallis, Oregon. 90 numb. leaves.Google Scholar
Fryxell, R. (1965). Mazama and Glacier Peak volcanic ash layers: Relative ages. Science 147, 12881290.Google Scholar
Gordon, G. E., Randle, K., Goles, G. G., Corliss, J. B., Beeson, M. H., and Oxley, S. S. (1968). Instrumental activation analysis of standard rocks with high-resolution γ-ray detectors. Geochimica et Cosmochimica Acta 32, 369396.CrossRefGoogle Scholar
Haskin, L. A., Frey, F. A., Schmitt, R. A., and Smith, R. H. (1966). Meteoritic, solar and terrestrial rare-earth distributions. Physics and Chemistry of the Earth Vol. 7, pp. 167321. Pergamon, New York.Google Scholar
Higgins, M. W., and Waters, A. C. (1968). Newberry caldera field trip. InAndesite Conference Guidebook,” pp.5977. Portland, Oregon, Department of Geology and Mineral Industries, Bulletin 62Google Scholar
Knox, J. B., Short, N. M. (1964). Diagnostic model using ash fall data to determine eruption characteristics and atmospheric conditions during a major volcanic event. Bulletin Volcanologique 27, 524.CrossRefGoogle Scholar
Krumbein, W. C., and Graybill, F. A. (1965). “An Introduction to Statistical Models in Geology.” McGraw Hill, New York. 475 pp.Google Scholar
Larsson, W. (1937). Vulkanische Asche vom Ausbruch des Chilenischen Vulkans Quizapú (1932) in Argentina gesammelt. Eine Studie über äolische Differentiation Bulletin of the Geological Institution of the University of Upsala 26, 2752. (Translated into English by R. E. Wilcox.).Google Scholar
Nelson, C. H., Kulm, L. D. ,Carlson, P. R., and Duncan, F. R. (1968). Mazama ash in the northeastern Pacific. Science 161, 4749.CrossRefGoogle ScholarPubMed
Powers, H. A., and Wilcox, R. E. (1964). Volcanic ash from Mount Mazama (Crater Lake) and from Glacier Peak. Science 144, 13341336.CrossRefGoogle ScholarPubMed
Smith, D. G. W., and Westgate, J. A. (1969). Electron probe technique for characterizing pyroclastic deposits. Earth and Planetary Science Letters 5, 313319.Google Scholar
Steen, V. C., and Fryxell, R. (1965). Mazama and Glacier Peak pumice glass: Uniformity of refractive index after weathering. Science 150, 878880.Google Scholar
Theisen, A. A., Borchardt, G. A., Harward, M. E., and Schmitt, R. A. (1968). Neutron activation for distinguishing Cascade Range pyroclastics. Science 161, 10091011.Google Scholar
Westgate, J. A., and Dreimanis, A. (1967). Volcanic ash layers of Recent age at Banff National Park, Alberta, Canada. Canadian Journal of Earth Sciences 4, 155161.CrossRefGoogle Scholar
Wilcox, R. E. (1965). Volcanic ash chronology. InThe Quaternary of the United States: Review Volume for the Seventh Congress of the International Association for Quaternary Research,” Boulder, Colorado, 1965 (Wright, H. E. Jr. and Frey, D. G.Eds.) pp. 807816. Princeton University Press, Princeton, New Jersey.Google Scholar
Williams, H. (1942). “The Geology of Crater Lake National Park, Oregon.” Carnegie Institute of Washington. Publication No. 540. Washington, D.C. 162 pp.Google Scholar