On the pairing of Antarctic ureilites with refernce to their parent body
In spite of their apparent igneous textures, ureilites preserve significant records of primitive nature including oxygen isotope anomaly and high planetary-type noble gas contents in the carbonaceous matrices. Mineralogical studies of new Antarctic ureilites revealed that pairing of the small ureili...
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Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo
1988
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ftnipr:oai:nipr.repo.nii.ac.jp:00004453 2023-05-15T13:49:01+02:00 On the pairing of Antarctic ureilites with refernce to their parent body Takeda,Hiroshi Mori,Hiroshi Ogata,Hiromi 1988-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4453 http://id.nii.ac.jp/1291/00004453/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4453&item_no=1&attribute_id=18&file_no=1 en eng Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4453 http://id.nii.ac.jp/1291/00004453/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 1, 145-172(1988-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4453&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1988 ftnipr 2023-01-28T20:04:07Z In spite of their apparent igneous textures, ureilites preserve significant records of primitive nature including oxygen isotope anomaly and high planetary-type noble gas contents in the carbonaceous matrices. Mineralogical studies of new Antarctic ureilites revealed that pairing of the small ureilite specimens may be only minor (two out of twenty-two) in comparison with the polymict eucrites. However, we noticed two groupings, which are almost paired but are distinct in pyroxene assemblages and reduction textures. The magnesian and calcic groups have been recognized only in the Antarctic collections. The individual specimens within the group may have evolved in the vicinity within a parent body. A model in conformity with this evolution has been proposed in the context of the ureilite-carbonaceous chondrite connection. However, the carbon-containing chondrite-like materials do not imply the actual chemistry of the known chondrites, because the preferential sedimentation of mafic silicates in the solar nebula may produce source materials much closer to ureilites. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Antarctic The Antarctic |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
In spite of their apparent igneous textures, ureilites preserve significant records of primitive nature including oxygen isotope anomaly and high planetary-type noble gas contents in the carbonaceous matrices. Mineralogical studies of new Antarctic ureilites revealed that pairing of the small ureilite specimens may be only minor (two out of twenty-two) in comparison with the polymict eucrites. However, we noticed two groupings, which are almost paired but are distinct in pyroxene assemblages and reduction textures. The magnesian and calcic groups have been recognized only in the Antarctic collections. The individual specimens within the group may have evolved in the vicinity within a parent body. A model in conformity with this evolution has been proposed in the context of the ureilite-carbonaceous chondrite connection. However, the carbon-containing chondrite-like materials do not imply the actual chemistry of the known chondrites, because the preferential sedimentation of mafic silicates in the solar nebula may produce source materials much closer to ureilites. |
format |
Report |
author |
Takeda,Hiroshi Mori,Hiroshi Ogata,Hiromi |
spellingShingle |
Takeda,Hiroshi Mori,Hiroshi Ogata,Hiromi On the pairing of Antarctic ureilites with refernce to their parent body |
author_facet |
Takeda,Hiroshi Mori,Hiroshi Ogata,Hiromi |
author_sort |
Takeda,Hiroshi |
title |
On the pairing of Antarctic ureilites with refernce to their parent body |
title_short |
On the pairing of Antarctic ureilites with refernce to their parent body |
title_full |
On the pairing of Antarctic ureilites with refernce to their parent body |
title_fullStr |
On the pairing of Antarctic ureilites with refernce to their parent body |
title_full_unstemmed |
On the pairing of Antarctic ureilites with refernce to their parent body |
title_sort |
on the pairing of antarctic ureilites with refernce to their parent body |
publisher |
Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo |
publishDate |
1988 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4453 http://id.nii.ac.jp/1291/00004453/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4453&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4453 http://id.nii.ac.jp/1291/00004453/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 1, 145-172(1988-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4453&item_no=1&attribute_id=18&file_no=1 |
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1766250469663965184 |