Physics – Geophysics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3224310k&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 24, CiteID L24310
Physics
Geophysics
2
Exploration Geophysics: Magnetic And Electrical Methods (5109), Geomagnetism And Paleomagnetism: Magnetic Anomalies: Modeling And Interpretation, Physical Properties Of Rocks: Magnetic And Electrical Properties (0925)
Scientific paper
It is known that second-order magnetic phase transition, the transition between ferromagnetic (ferrimagnetic) and paramagnetic states of the material at the Curie temperature, is accompanied by a sharp (theoretically infinite) enhancement of the magnetic susceptibility. A second-order magnetic phase transition within the Earth (usually at mid-crustal depths, depending on geothermal conditions and on the type of magnetic material) is assumed to produce extremely high susceptibility zones of a thickness of a few hundreds of meters. Such strongly magnetized zones may be sources of well-known but not-yet explained geomagnetic anomalies, and at the same time, they may produce complicated electrical conductivity anomalies, as well. The second-order magnetic phase transition should be taken into account as one of the possible sources of geomagnetic and magnetotelluric anomalies.
Kiss J.
Prácser E.
Szarka László
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