The use of magnetic susceptibility and its frequency dependence for delineation of a magnetic stratigraphy in ash-flow tuffs

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Abstract

Variations in the grain size, amount, and mineralogy of magnetic phases in layered volcanic rocks define a magnetic stratigraphy that can be identified by means of magnetic susceptibility measurements. In ash-flow tuffs, grain size and other variables that control susceptibility are to a large extent a function of the cooling and alteration history. At Yucca Mountain, Nevada, laterally-continuous high-susceptibility (~ 10-2 SI) horizons exist in the Paintbrush Tuff due to the presence of either precipitates or phenocrystic Fe-Ti oxides. The frequency dependence of magnetic susceptibility, χ(ω), can be used to discriminate between horizons with superparamagnetic precipitates and horizons with multi-domain phenocrystic material. Interpretation of variations established by field and laboratory susceptibility data has been constrained by petrography and transmission electron microscopy (TEM) . -from Authors

Original languageEnglish (US)
Pages (from-to)783-786
Number of pages4
JournalGeophysical Research Letters
Volume17
Issue number6
StatePublished - 1990
Externally publishedYes

Fingerprint

Yucca
ash flow
delineation
frequency dependence
stratigraphy
ashes
magnetic susceptibility
Transmission Electron Microscopy
Oxides
grain size
History
magnetic permeability
horizon
petrography
tuff
transmission electron microscopy
volcanic rock
mineralogy
oxide
precipitates

ASJC Scopus subject areas

  • Medicine(all)
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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abstract = "Variations in the grain size, amount, and mineralogy of magnetic phases in layered volcanic rocks define a magnetic stratigraphy that can be identified by means of magnetic susceptibility measurements. In ash-flow tuffs, grain size and other variables that control susceptibility are to a large extent a function of the cooling and alteration history. At Yucca Mountain, Nevada, laterally-continuous high-susceptibility (~ 10-2 SI) horizons exist in the Paintbrush Tuff due to the presence of either precipitates or phenocrystic Fe-Ti oxides. The frequency dependence of magnetic susceptibility, χ(ω), can be used to discriminate between horizons with superparamagnetic precipitates and horizons with multi-domain phenocrystic material. Interpretation of variations established by field and laboratory susceptibility data has been constrained by petrography and transmission electron microscopy (TEM) . -from Authors",
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T1 - The use of magnetic susceptibility and its frequency dependence for delineation of a magnetic stratigraphy in ash-flow tuffs

AU - Eick, P. M.

AU - Schlinger, Charles M

PY - 1990

Y1 - 1990

N2 - Variations in the grain size, amount, and mineralogy of magnetic phases in layered volcanic rocks define a magnetic stratigraphy that can be identified by means of magnetic susceptibility measurements. In ash-flow tuffs, grain size and other variables that control susceptibility are to a large extent a function of the cooling and alteration history. At Yucca Mountain, Nevada, laterally-continuous high-susceptibility (~ 10-2 SI) horizons exist in the Paintbrush Tuff due to the presence of either precipitates or phenocrystic Fe-Ti oxides. The frequency dependence of magnetic susceptibility, χ(ω), can be used to discriminate between horizons with superparamagnetic precipitates and horizons with multi-domain phenocrystic material. Interpretation of variations established by field and laboratory susceptibility data has been constrained by petrography and transmission electron microscopy (TEM) . -from Authors

AB - Variations in the grain size, amount, and mineralogy of magnetic phases in layered volcanic rocks define a magnetic stratigraphy that can be identified by means of magnetic susceptibility measurements. In ash-flow tuffs, grain size and other variables that control susceptibility are to a large extent a function of the cooling and alteration history. At Yucca Mountain, Nevada, laterally-continuous high-susceptibility (~ 10-2 SI) horizons exist in the Paintbrush Tuff due to the presence of either precipitates or phenocrystic Fe-Ti oxides. The frequency dependence of magnetic susceptibility, χ(ω), can be used to discriminate between horizons with superparamagnetic precipitates and horizons with multi-domain phenocrystic material. Interpretation of variations established by field and laboratory susceptibility data has been constrained by petrography and transmission electron microscopy (TEM) . -from Authors

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