Magnetic properties of magnetite at high pressure and implications for magnetic anomalies on Earth and other planets

Details Magnetic properties of magnetite at high pressure and implications for magnetic anomalies on Earth and other planets Magnetic properties of magnetite at high pressure and implications for magnetic anomalies on Earth and other planets

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3397g&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3397

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Scientific paper

We have developed a system that measures magnetic properties of samples under high pressures (in excess of 30 GPa) in a diamond anvil cell. For magnetite, which is the most abundant magnetic mineral in the Earth's crust, we find that hysteresis parameters vary <15 percent below 0.6 to 1.0 GPa, while at higher pressures, significant increases occur in bulk coercivity (Hc) and the ratio of saturation remanent magnetization (Mrs) to saturation magnetization (Ms). The net effect of pressure is to displace magnetite toward a truer single domain state with both higher Mrs/Ms and Hc. In other words, subject to identical external field conditions, a magnetite grain at high pressure will have a higher magnetic intensity (and higher Curie point) than a magnetite grain of equivalent mass at low pressure. Our data suggest that magnetite can account for geomagnetic anomalies related to some subduction zones and to meteorite impact sites on Earth (such as Vredefort which has some of the highest known Koenigsberger ratios on the planet), as well as magnetic signatures observed on some planetary bodies like Mars.

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