Terrestrial 81Kr-ages of four Yamato meteorites
The terrestrial ages of four Yamato achondrites have been determined from ^<81>Kr-Kr-exposure ages and cosmogenic ^<38>Ar concentrations. A comparison of terrestrial ages and exposure ages shows that Y-74450 and Y-790007 are paired. The terrestrial age is less than 4×(10)^4y and the expo...
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Max-Planck-Institut fur Chemie
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00001974 2023-05-15T17:10:59+02:00 Terrestrial 81Kr-ages of four Yamato meteorites Ludolf Schultz 1986-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1974 http://id.nii.ac.jp/1291/00001974/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1974&item_no=1&attribute_id=18&file_no=1 en eng Max-Planck-Institut fur Chemie https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1974 http://id.nii.ac.jp/1291/00001974/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 319-327(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1974&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:46Z The terrestrial ages of four Yamato achondrites have been determined from ^<81>Kr-Kr-exposure ages and cosmogenic ^<38>Ar concentrations. A comparison of terrestrial ages and exposure ages shows that Y-74450 and Y-790007 are paired. The terrestrial age is less than 4×(10)^4y and the exposure age is about 70×(10)^6y. This group of polymict eucrites is different from Y-790122,Y-790260 and Y-790266. The diogenite Y-75032 has an exposure age of 17×(10)^6y and a terrestrial age of less than 7×(10)^4y. The howardite Y-790727 contains large amounts of trapped gases. The exposure age is about 20×(10)^6y. The terrestrial ages of Yamato meteorites are younger than those from the Allan Hills region. This is possibly due to a young age of the Yamato ice field. The relatively short terrestrial ages also exclude a longer time of transportation within the ice and a special concentration mechanism due to ice flow. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
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Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
The terrestrial ages of four Yamato achondrites have been determined from ^<81>Kr-Kr-exposure ages and cosmogenic ^<38>Ar concentrations. A comparison of terrestrial ages and exposure ages shows that Y-74450 and Y-790007 are paired. The terrestrial age is less than 4×(10)^4y and the exposure age is about 70×(10)^6y. This group of polymict eucrites is different from Y-790122,Y-790260 and Y-790266. The diogenite Y-75032 has an exposure age of 17×(10)^6y and a terrestrial age of less than 7×(10)^4y. The howardite Y-790727 contains large amounts of trapped gases. The exposure age is about 20×(10)^6y. The terrestrial ages of Yamato meteorites are younger than those from the Allan Hills region. This is possibly due to a young age of the Yamato ice field. The relatively short terrestrial ages also exclude a longer time of transportation within the ice and a special concentration mechanism due to ice flow. |
format |
Report |
author |
Ludolf Schultz |
spellingShingle |
Ludolf Schultz Terrestrial 81Kr-ages of four Yamato meteorites |
author_facet |
Ludolf Schultz |
author_sort |
Ludolf Schultz |
title |
Terrestrial 81Kr-ages of four Yamato meteorites |
title_short |
Terrestrial 81Kr-ages of four Yamato meteorites |
title_full |
Terrestrial 81Kr-ages of four Yamato meteorites |
title_fullStr |
Terrestrial 81Kr-ages of four Yamato meteorites |
title_full_unstemmed |
Terrestrial 81Kr-ages of four Yamato meteorites |
title_sort |
terrestrial 81kr-ages of four yamato meteorites |
publisher |
Max-Planck-Institut fur Chemie |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1974 http://id.nii.ac.jp/1291/00001974/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1974&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Allan Hills Yamato |
geographic_facet |
Allan Hills Yamato |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1974 http://id.nii.ac.jp/1291/00001974/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 319-327(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1974&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067787053137920 |