Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan

Details Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan Magnetic properties of Kurokami pumices from Mt. Sakurajima, Japan

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.192..439y&link_type=abstract

Earth and Planetary Science Letters, Volume 192, Issue 3, p. 439-446.

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Scientific paper

Both chromite and low-Ti titanomagnetite are carriers of natural remanent magnetization (NRM) in Kurokami andesitic pumices of Mt. Sakurajima, Japan. Thermal demagnetization of the NRM and of a laboratory isothermal remanence indicate unblocking of chromite remanence between 200 and 260°C and of titanomagnetite remanence between 400 and 520°C. Electron microprobe analyses support the compositions Fe1.9Cr1.11O4 and Fe2.9Ti0.1O4 indicated by the respective Curie temperatures of 260°C and 520-530°C. Chromite is thermally unstable and converts to magnetite during thermal demagnetization, leading to a self-reversal of NRM between 500 and 580°C. The chromite contributes about 25% of the NRM intensity of the sample.

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