Identification of stable remanence carriers through a magneto-impedance scanning magnetic microscope |
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Authors: | M Uehara N Nakamura |
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Institution: | (1) Division of GeoEnvironmental Science, Tohoku University, Aoba, Sendai 980-8578, Japan |
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Abstract: | To identify the stable remanence carrier in rock samples, we conducted magnetic microscopic observations combined with conventional
stepwise demagnetization experiments. The instrument, which employs an amorphous wire-based magneto-impedance sensor (30 μm
diameter, 5 mm length), can document magnetic anomalies (vertical component) of the millimeter to sub-millimeter-thick rock
samples with a resolution of 500 μm. Our new technique allows identification of the sources of both stable and unstable remanence
components in meteorite and shocked granite samples. However, stray magnetic fields from the sensor magnetize the magnetic
minerals in the sample and makes serious artifacts on the magnetic images. Although the artifacts of the induced magnetization
should be solved, this new corroborative technique leads to a microscopic discrimination of stable paleomagnetic records from
terrestrial and extraterrestrial materials. |
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Keywords: | magnetic microscope MI sensor remanent magnetization demagnetization extraterrestrial magnetism chondrites Vredefort granite |
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