Paleomagnetism of Antarctic Achondrites
The paleointensity of two eucrites (ALHA77302 and ALHA78040), a ureilite (ALHA77257) and an eucritic unique achondrite (ALHA77005) has been newly estimated by means of a comparison of the AF-demagne-tization characteristics of their NRM with those of their ARM. The upper limit of paleointensity (F_p...
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| Format: | Report |
| Language: | English |
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National Institute of Polar Research
1980
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| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1103 http://id.nii.ac.jp/1291/00001103/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1103&item_no=1&attribute_id=18&file_no=1 |
| Summary: | The paleointensity of two eucrites (ALHA77302 and ALHA78040), a ureilite (ALHA77257) and an eucritic unique achondrite (ALHA77005) has been newly estimated by means of a comparison of the AF-demagne-tization characteristics of their NRM with those of their ARM. The upper limit of paleointensity (F_p) is 0.049,0.060,0.089 and 0.010 Oe for ALHA77302,78040,77257 and 77005 respectively. F_p of ALHA77005 may represent the ambient magnetic field when this achondrite was remelted by severe shocks about 1.8 million years ago, whereas F_p-values of the other three achondrites may indicate the paleomagnetic field when these achondrites differentiated about 4.5 billion years ago. |
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