Lattice preferred orientation of graphite determined by the anisotropy of out-of-phase magnetic susceptibility

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F22%3A00553478" target="_blank" >RIV/67985831:_____/22:00553478 - isvavai.cz</a>

Alternative codes found

RIV/00025798:_____/22:00000032 RIV/00216208:11310/22:10457212

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0191814121002157?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0191814121002157?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsg.2021.104491" target="_blank" >10.1016/j.jsg.2021.104491</a>

Result language

angličtina

Original language name

Lattice preferred orientation of graphite determined by the anisotropy of out-of-phase magnetic susceptibility

Original language description

Single crystals of graphite are diamagnetic with a strong crystalline anisotropy. Their magnetic susceptibility measured in alternating fields exhibits a weak, negative in-phase component and a relatively strong out-of-phase component due to electric eddy currents. Consequently, if graphite crystals are oriented preferentially by their crystal lattices (LPO) in graphite ore, one would expect a strong anisotropy of magnetic susceptibility (AMS) of the bulk rock. However, the standard AMS, which is the anisotropy of the in-phase component of susceptibility (ipAMS), reflects not only the LPO of graphite, but also the preferred orientation of the paramagnetic and ferromagnetic admixtures. On the other hand, the anisotropy of out-of-phase susceptibility (opAMS) in rocks such as these should directly indicate the graphite LPO due to its strong electrical conductivity, and can therefore be considered free from the contributions of non-conductive paramagnetic and ferromagnetic minerals. These competing factors were tested on natural metamorphic graphite ores near the South Bohemian town of Český Krumlov in the Moldanubian Zone. The ipMS of the ore is very low, 10-6 to 10-4 [SI], being positive in some specimens and negative in others, which indicates mixtures with variable proportions of graphite and paramagnetic-ferromagnetic minerals. On the other hand, opMS is exclusively positive, on the order of 10-5 to 10-4, and is strongly indicative of graphite. The degree of opAMS is distinctly high at 200–300%, and the opAMS lineation is closely perpendicular to the metamorphic foliation in ores and wall rocks. All this indicates a conspicuous LPO of graphite in the ore that was probably created during Variscan regional metamorphism and associated ductile deformation.

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

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

Name of the periodical

Journal of Structural Geology

ISSN

0191-8141

e-ISSN

1873-1201

Volume of the periodical

154

Issue of the periodical within the volume

January

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

104491

UT code for WoS article

000744058900001

EID of the result in the Scopus database

2-s2.0-85120625301