Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810203g&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 10, CiteID L10203
Physics
1
Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Mineralogy And Petrology: Meteorite Mineralogy And Petrology (1028, 6240)
Scientific paper
We present low temperature magnetic data (thermal demagnetization, hysteresis) obtained on thirty three ordinary chondrite meteorites. A magnetic transition is observed in the 40-80 K range (average 66 K), and is interpreted as a ferrimagnetic to paramagnetic phase transition. We present quantitative analyses of changes in magnetization across the magnetic phase transition and chemical elemental analyses to argue that chromite, a common accessory mineral in meteorites, is the mineral undergoing the phase transition, and not troilite or tetrataenite as proposed in previous studies. Moreover, we observe a correlation between the measured Curie temperature and chemical composition of chromites in ordinary chondrites. Low temperature magnetic measurement are thus a sensitive indicator of chromite composition in these meteorites, and as such a possible proxy to the understanding of their thermal metamorphism.
Gattacceca Jérôme
Lagroix France
Mathe Pierre-Etienne
Rochette Pierre
Zanda Brigitte
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