Effects of and methods for determination of induced magnetic anisotropy of igneous and metamorphosed rocks

The phenomena of the magnetic memory of rocks associated with paleointensity, paleotemperature, and paleostress are reviewed and discussed here. The methods for the determination of the paleointensity and the paleoconditions are described and discussed in terms of their sensitivity and applicability...

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Bibliographic Details
Published in:Studia geophysica et geodaetica 2013, Vol.57 (1), p.118-137
Main Authors: Vetchfinskii, Vladimir S., Túnyi, Igor, Vajda, Peter, Solov’eva, Svetlana. S.
Format: Article
Language:English
Subjects:
Anisotropy
Atmospheric Sciences
Earth and Environmental Science
Earth Sciences
Geomagnetic field
Geophysics
Geophysics/Geodesy
Rocks
Structural Geology
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Summary:The phenomena of the magnetic memory of rocks associated with paleointensity, paleotemperature, and paleostress are reviewed and discussed here. The methods for the determination of the paleointensity and the paleoconditions are described and discussed in terms of their sensitivity and applicability. The determination of paleoconditions (stress and temperature) is essential for understanding rock mineral formation and rock history. Such knowledge is applicable also in ore deposit geology and geophysics. The phenomena of the magnetic memory manifest themselves through the constriction and asymmetry in the hysteresis loops, as well as through a nonlinear pattern in the anhysteretic magnetization curve, both being due to the induced magnetic anisotropy. The pros and cons of some applied methods are reviewed. The superposition of several paleotemperatures (re-heatings of the rock) and/or paleostresses is studied also. Under certain conditions, a rock can remember information on several paleotemperatures (paleo-heating events), as well as the respective intensities of the geomagnetic field of the past.
ISSN:0039-3169
1573-1626
DOI:10.1007/s11200-011-1177-9