Anisotropy of susceptibility in rocks which are magnetically nonlinear even in low fields

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10392643" target="_blank" >RIV/00216208:11310/18:10392643 - isvavai.cz</a>

Alternative codes found

RIV/67985831:_____/18:00490845

Result on the web

<a href="https://doi.org/10.1093/gji/ggy088" target="_blank" >https://doi.org/10.1093/gji/ggy088</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/gji/ggy088" target="_blank" >10.1093/gji/ggy088</a>

Result language

angličtina

Original language name

Anisotropy of susceptibility in rocks which are magnetically nonlinear even in low fields

Original language description

Theory of the low-field anisotropy of magnetic susceptibility (AMS) assumes a linear relationship between magnetization and magnetizing field, resulting in field-independent susceptibility. This is valid for diamagnetic and paramagnetic minerals by definition and also for pure magnetite, while in titanomagnetite, pyrrhotite and hematite the susceptibility may be clearly field-dependent even in low fields used in common AMS meter. Consequently, the use of the linear AMS theory is fully legitimate in the former minerals, but in principle incorrect in the latter ones. Automated measurement of susceptibility in 320 directions in variable low-fields ranging from 5 to 700 A m(-1) was applied to more than 100 specimens of various pyrrhotite-bearing and titanomagnetite-bearing rocks. Data analysis showed that the anisotropic susceptibility remains well represented by an ellipsoid in the entire low-field span even though the ellipsoid increases its volume and eccentricity. The principal directions do not change their orientations with low-field in most specimens. Expressions for susceptibility as a function of field were found in the form of diagonal tensor whose elements are polynomials of low order. In a large proportion of samples, the susceptibility expressions can be further simplified to have one common skeleton polynomial.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geophysical Journal International

ISSN

0956-540X

e-ISSN

—

Volume of the periodical

213

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

12

Pages from-to

1792-1803

UT code for WoS article

000434675800026

EID of the result in the Scopus database

2-s2.0-85052515577