Ferromagnetic resonance of precipitated phases in natural glasses

doi:10.1016/0022-3093(84)90142-X

Journal of Non-Crystalline Solids

Volume 67, Issues 1–3, September 1984, Pages 81-118

https://doi.org/10.1016/0022-3093(84)90142-X Get rights and content

Abstract

This paper describes the practical application of ferromagnetic resonance (FMR) in characterizing the iron-rich precipitates commonly occurring in natural glasses. Following a capsule introduction to the principles of FMR powder pattern analysis, some new results for obsidians and Mount St Helens ash are briefly presented. Attention is later drawn to the critical influences of gas-phase equilibria in determining the natures of the precipitated phases in fine particulate glasses, and it is demonstrated that synthetic “natural glass analogues” can be important aids in interpreting the FMR spectra of natural samples. An extensive discussion of the ferromagnetic phases in lunar glasses of both volcanic and micrometeoroid-impact origins is built largerly upon elements of the author's previously published and unpublished work, and suggestions are offered for future FMR studies of these materials. Finally, an appendix compares two methods of thermomagnetic analysis based on FMR and contrasts these with the results of more classical techniques.

References (93)

J.A. O'Keefe, plenary lecture, these Proceedings (Natural Glasses), p....
R.A. Weeks et al., unpublished...
A. Bishay et al.
M. Nasrallah et al.
R.A. Weeks et al.
J. Non-Crystalline Solids
(1980)
R.A. Weeks et al., these Proceedings (Natural Glasses) p....
R.V. Morris et al.
Geochim. Cosmochim. Acta
(1974)
R.V. Morris et al.
Geochim. Cosmochim. Acta
(1974)
P.M. Bell et al.
H.D. Schreiber et al.

H.D. Schreiber

H.V. Lauer et al.

J. Am. Ceram. Soc.

(1977)

H.D. Schreiber et al.

Phys. Chem. Glasses

(1978)

H.D. Schreiber et al.

Geochim. Cosmochim. Acta

(1980)

S.E. Haggerty

Geophys. Res. Lett.

(1977)

D.L. Griscom

J. Non-Crystalline Solids

(1980)

D.L. Griscom

J. Non-Crystalline Solids

(1980)

D.L. Griscom, to be...

D.L. Griscom et al.

Earth Planet. Sci. Lett.

(1974)

R.F. Butler et al.

J. Geophys. Res.

(1975)

D.J. Dunlop

J. Geophys. Res.

(1973)

A.H. Morrish

The Physical Principals of Magnetism

(1965)

K.J. Standley et al.

E. Schlömann

J. Phys. Chem. Solids

(1958)

F.-D. Tsay et al.

Geochim. Cosmochim. Acta

(1971)

D.J. Griscom

J. Magn. Reson.

(1981)

P.C. Taylor et al.

Chem. Rev.

(1975)

D.L. Griscom et al.

J. Appl. Phys.

(1979)

D.L. Griscom

IEEE Trans. on Magnetics MAG-17

(1981)

D.L. Griscom, unpublished simulations of spectra obtained by R.A....

J.E. Ericson et al.

J. Non-Crystalline Solids

(1975)

D.L. Griscom,...

P.R. Hooper et al.

Science

(1980)

D.L. Griscom et al.

J. Geophys. Res.

(1975)

R.A. Weeks et al.

D.L. Griscom, not...

The Lunar Sample Preliminary Examination Team

Science

(1969)

R.M. Housley et al.

Proc. 4th Lunar Sci. Conf.

Geochim. Cosmochim. Acta

(1973)

R.A. Weeks et al.

Science

(1970)

R.A. Weeks et al.

J.L. Kolopus et al.

F.D. Tsay et al.

D.L. Griscom et al.

R.A. Weeks

D.L. Griscom et al.

R.A. Weeks

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