40Ar-39Ar analyses of Yamato-75097 (L6) chondrite from Antarctica
P(論文) ^<40>Ar-^<39>Ar analyses were performed on the host phase of an H-clast bearing chondrite Yamato-75097 (L6). The result indicates a typical U-shaped age spectrum, suggesting that the serious degassing event occurred at about 490Ma or slightly younger age for this meteorite. Since t...
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| Language: | English |
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National Institute of Polar Research
1988
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| Online Access: | https://nipr.repo.nii.ac.jp/record/4457/files/KJ00000036263.pdf https://doi.org/10.15094/00004457 https://nipr.repo.nii.ac.jp/records/4457 |
| Summary: | P(論文) ^<40>Ar-^<39>Ar analyses were performed on the host phase of an H-clast bearing chondrite Yamato-75097 (L6). The result indicates a typical U-shaped age spectrum, suggesting that the serious degassing event occurred at about 490Ma or slightly younger age for this meteorite. Since the meteorite shows a sign of shock, this event might have been a collisional event. It is estimated that more than 99% of radiogenic ^<40>Ar was degassed during this event. For this degassing, it requires prolonged time of at least a few hours even at 1200℃, and a longer time is required if the ambient temperature is lower and the diffusion mainly controls the degassing process. departmental bulletin paper |
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