Magnetic field visualization of magnetic minerals and grain boundary regions using magneto-optical imaging

Details

Serval ID
serval:BIB_3090897D27EE
Type
Article: article from journal or magazin.
Collection
Publications
Title
Magnetic field visualization of magnetic minerals and grain boundary regions using magneto-optical imaging
Journal
Journal of Geophysical Research - Solid Earth
Author(s)
Bobyl A.V., Podladchikov Y.Y., Austrheim H., Jamtveit B., Johansen T.H., Shantsev D.V.
ISSN-L
0148-0227
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
112
Pages
B04105
Language
english
Abstract
[1] Magneto-optical imaging based on the Faraday effect has been used
to characterize magnetic minerals embedded in a nonmagnetic matrix. We
have studied magnetite grains and magnetite-magnetite grain boundary
regions in samples of skarns and serpentinites. Distributions of the
remanent magnetic field were measured across at the surface of polished
thin sections kept at room temperature. The magneto-optical images
resolve directly magnetic structures on length scales ranging from
millimeter down to micrometer, thereby revealing the shape and
arrangement of the magnetite grains and allow determination of the grain
magnetization. We find that ( 1) for the skarns the intergrain
interactions do not affect the magnetic properties of magnetite grains
within 0.6 - 60 mu m of each other, while the saturation remanence
decreases weakly with increasing grain size from 40 mm to 0.6 mm, and (
2) for the serpentinites the magnetic properties of the stripes are
size-dependent due to variations in chemical composition.
Create date
09/10/2012 19:50
Last modification date
20/08/2019 13:15
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