Donadini, Fabio

Kohout, Tomas

Pesonen, Lauri J.

Uehara, M.

Pesonen, Lauri

Uehara, Minoru

HAL Descartes

Rock Magnetic Studies of the Neuschwanstein EL6 Chondrite - Implications on the Origin of its Natural Remanent Magnetization

HAL AMU

Helsingin yliopiston digitaalinen arkisto

Rock Magnetic Studies of the Neuschwanstein EL6 Chondrite : Implications on the Origin of its Natural Remanent Magnetization

We report magnetic properties of the Neuschwanstein enstatite chondrite (EL6). Low magnetic coercivity of the Neuschwanstein samples indicates presence of multidomain magnetic grains. Thermomagnetic and microprobe investigations reveal kamacite with 6 % Ni to be the main magnetic phase, but there is also an indication for the presence of a low-Ni phase in thermomagnetic curves. However, this low-Ni phase was not observed in microprobe analysis. The natural remanent magnetization (NRM) of Neuschwanstein interior has low stability against alternating demagnetization field (median destructive field ~ 3 mT) while the samples containing fusion crust have NRM of higher coercivity (median destructive field ~ 17 mT). The NRM of the meteorite was tested for presence of isothermal remanent magnetization (IRM) overprint. The results indicate that the NRM of Neuschwanstein was most likely overprinted by a strong IRM during the meteorite handling. Thus, the Neuschwanstein meteorite is not suitable for paleointensity studies. Such a test for the presence of the artificial IRM overprint should be always done prior interpreting NRM in meteorites

Tomas Kohout

Fabio Donadini

Lauri J. Pesonen

Minoru Uehara

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Rock Magnetic Studies of the Neuschwanstein EL6 Chondrite – Implications on the Origin of its Natural Remanent Magnetization

HAL-INSU

http://www.geophysica.fi/pdf/geophysica_2010_46_1-2_003_kohout.pdf

Rock Magnetic Studies of the Neuschwanstein EL6 Chondrite : Implications on the Origin of its Natural Remanent Magnetization

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HAL Descartes

HAL AMU

Helsingin yliopiston digitaalinen arkisto

CiteSeerX

HAL-INSU