Natural Remanent Magnetization of Antarctic Meteorites
The stability of natural remanent magnetization (NRM) of various chemical groups of meteorites, which have been carefully recovered from the Antarctic ice sheet surface, is examined against the AF-demagnetization. The meteorites examined are 1 E-chondrite, 3 H-chondrites, 5 L-chondrites, 2 LL-chondr...
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| Format: | Report |
| Language: | English |
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National Institute of Polar Research
1979
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| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=971 http://id.nii.ac.jp/1291/00000971/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=971&item_no=1&attribute_id=18&file_no=1 |
| Summary: | The stability of natural remanent magnetization (NRM) of various chemical groups of meteorites, which have been carefully recovered from the Antarctic ice sheet surface, is examined against the AF-demagnetization. The meteorites examined are 1 E-chondrite, 3 H-chondrites, 5 L-chondrites, 2 LL-chondrites, 3 C-chondrites, 4 achondrites, 3 irons and 1 pallasite. In general, the AF-demagnetization stability of NRM's of C-chondrites and achondrites is sufficiently high to be attributed to the natural remanence acquired in the extraterrestrial space. NRM of 3 irons also is reasonably stable, but the NRM is very likely to be attributable to TRM acquired in the geomagnetic field on entry into the earth's atmosphere. NRM's of E-, H-, L- and LL-chondrites and pallasite are much less stable compared with those of C-chondrites and achondrites. It cannot be recommended, therefore, to use those meteorites having poor stability of NRM for the paleointensity research purpose. |
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