Magnetism and magnetic mineralogy of ash flow tuffs from Yucca Mountain, Nevada

Charles M Schlinger, D. R. Veblen, J. G. Rosenbaum

Research output: Contribution to journalArticle

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Abstract

The magnetic susceptibility (χ and remanent magnetization of an ash flow sheet are profoundly influenced by cooling history after emplacement. Spatial variations in these properties, therefore, provide a potentially useful tool for geological studies. Maxima and minima in χ measured along profiles at Yucca Mountain, Nevada, identify persistent magnetic marker horizons within virtric portions of the Tiva Canyon and underlying Topopah Spring Members of the Paintbrush Tuff. The correlatable variations of χ with vertical position in these units exist over the 8 km of strike examined. The observed stratigraphic changes in magnetic properties reflect variations in amounts and mineralogy of Fe-Ti oxide phenocrysts, and the presence, shape, size, and mineralogy of magnetic Fe-oxide microcrystals that precipitated at high temperature after emplacement of each sheet. -from Authors

Original languageEnglish (US)
Pages (from-to)6035-6052
Number of pages18
JournalJournal of Geophysical Research E: Planets
Volume96
Issue numberB4
StatePublished - 1991
Externally publishedYes

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ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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