Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method
Possible weathering effect on the Rb-Sr system has been examined for the Allan Hills-769 chondrite (L6) by leaching experiments. The results of measurement of leachability of K, Rb and Sr with 1 N-HCl in the weathered and fresh specimens of the meteorite which had no fusion crust suggest that the we...
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Department of Earth Sciences, Faculty of Science, Kobe University
1980
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ftnipr:oai:nipr.repo.nii.ac.jp:00001097 2023-05-15T13:47:59+02:00 Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method Akihiro Ito Noboru Nakamura Akimasa Masuda 1980-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1097 http://id.nii.ac.jp/1291/00001097/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1097&item_no=1&attribute_id=18&file_no=1 en eng Department of Earth Sciences, Faculty of Science, Kobe University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1097 http://id.nii.ac.jp/1291/00001097/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 17, 168-176(1980-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1097&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1980 ftnipr 2022-11-12T19:41:54Z Possible weathering effect on the Rb-Sr system has been examined for the Allan Hills-769 chondrite (L6) by leaching experiments. The results of measurement of leachability of K, Rb and Sr with 1 N-HCl in the weathered and fresh specimens of the meteorite which had no fusion crust suggest that the weathering effect in the antarctic ice was limited to the surface of the grains of meteorite regarding the Rb-Sr system. The results of the Rb-Sr isotopic measurement of the Yamato-74190 chondrite (L6) suggest that moderate impact events were responsible for the observed Rb-Sr isotopic disturbance. Because majority of Rb-Sr data of the mineral separates are grossly correlated for ∿ 4.5 b.y. isochron, the Rb-Sr system of this meteorite appears to have retained the nature of the early thermal metamorphism much better than the K-Ar system which shows youngest age of ∿0.36 b.y. (KANEOKA et al. : Mem. Natl Inst. Polar Res., Spec. Issue, 12,186,1979). Report Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic The Antarctic Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Possible weathering effect on the Rb-Sr system has been examined for the Allan Hills-769 chondrite (L6) by leaching experiments. The results of measurement of leachability of K, Rb and Sr with 1 N-HCl in the weathered and fresh specimens of the meteorite which had no fusion crust suggest that the weathering effect in the antarctic ice was limited to the surface of the grains of meteorite regarding the Rb-Sr system. The results of the Rb-Sr isotopic measurement of the Yamato-74190 chondrite (L6) suggest that moderate impact events were responsible for the observed Rb-Sr isotopic disturbance. Because majority of Rb-Sr data of the mineral separates are grossly correlated for ∿ 4.5 b.y. isochron, the Rb-Sr system of this meteorite appears to have retained the nature of the early thermal metamorphism much better than the K-Ar system which shows youngest age of ∿0.36 b.y. (KANEOKA et al. : Mem. Natl Inst. Polar Res., Spec. Issue, 12,186,1979). |
format |
Report |
author |
Akihiro Ito Noboru Nakamura Akimasa Masuda |
spellingShingle |
Akihiro Ito Noboru Nakamura Akimasa Masuda Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
author_facet |
Akihiro Ito Noboru Nakamura Akimasa Masuda |
author_sort |
Akihiro Ito |
title |
Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
title_short |
Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
title_full |
Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
title_fullStr |
Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
title_full_unstemmed |
Examination of Effects of Shock and Weathering for the Antarctic L6 Chondrites, Yamato-74190 and Allan Hills-769, by the Rb-Sr Method |
title_sort |
examination of effects of shock and weathering for the antarctic l6 chondrites, yamato-74190 and allan hills-769, by the rb-sr method |
publisher |
Department of Earth Sciences, Faculty of Science, Kobe University |
publishDate |
1980 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1097 http://id.nii.ac.jp/1291/00001097/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1097&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) ENVELOPE(159.667,159.667,-76.717,-76.717) |
geographic |
Antarctic The Antarctic Yamato Allan Hills |
geographic_facet |
Antarctic The Antarctic Yamato Allan Hills |
genre |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1097 http://id.nii.ac.jp/1291/00001097/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 17, 168-176(1980-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1097&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248237088374784 |