Self-reversal of magnetization in oceanic submarine basalts studied with XMCD

Details Self-reversal of magnetization in oceanic submarine basalts studied with XMCD Self-reversal of magnetization in oceanic submarine basalts studied with XMCD

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3711306c&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 11, CiteID L11306

Physics

Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Reversals: Process, Timescale, Magnetostratigraphy

Scientific paper

In oceanic basalts, self-reversal of magnetization can be produced during extreme low-temperature oxidation of titanomagnetite by ionic reordering, which leads to Néel N-type magnetism. Titanomaghemites showing N-type reversal below room temperature were found in submarine basalts recovered during Ocean Drilling Program (ODP) Leg 197. In order to better understand the mechanism of self-reversal, we carried out X-ray magnetic circular dichroism (XMCD) at Fe K-edge at room temperature and low-temperature on such a titanomaghemite sample as well as on pure magnetite and maghemite samples. We found that the XMCD spectrum of the N-type titanomaghemite at 20 K is a mirror image of the XMCD spectrum at 300 K, which shows that the octahedral and tetrahedral subnetworks reverse in this process. Ligand-field multiplet calculations of XMCD at Fe K-edge help identify the contributions of the different elements in the measured XMCD spectra. This mechanism could also cause self-reversal above room temperature, which has important consequences for the reliability of paleomagnetic measurements.

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