Mineralogical study of some brecciated Antarctic eucrites
In order to obtain better understanding of the entire range of Antarctic brecciated eucrites and impact and thermal history of the HED-parent body, we studied brecciated Antarctic eucrites : Y-82202,Y-82210,Y-793548,and Y-793570 mineralogically and petrographically. Y-793548,Y-82210,and Y-793570 are...
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Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo
1992
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ftnipr:oai:nipr.repo.nii.ac.jp:00004581 2023-05-15T13:49:02+02:00 Mineralogical study of some brecciated Antarctic eucrites Akira Yamaguchi Hiroshi Takeda 1992-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4581 http://id.nii.ac.jp/1291/00004581/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4581&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 National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4581 http://id.nii.ac.jp/1291/00004581/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 5, 242-257(1992-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4581&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1992 ftnipr 2023-02-04T20:06:16Z In order to obtain better understanding of the entire range of Antarctic brecciated eucrites and impact and thermal history of the HED-parent body, we studied brecciated Antarctic eucrites : Y-82202,Y-82210,Y-793548,and Y-793570 mineralogically and petrographically. Y-793548,Y-82210,and Y-793570 are nearly monomict breccias with clasts components of rapidly cooled materials and minor slowly cooled pyroxenes (e. g., Juvinastype). Y-82202 is a monomict breccia penetrated by glassy shock melt veins. We suggest that the polished thin sections of the five eucrites presently available belong to a single suite which contains mostly quickly cooled varieties of eucrites similar to those in Pasamonte or in the Y-74159-type polymict eucrites, but more slowly cooled varieties such as ordinary eucrites or cumulate eucrites are scarce in these sections. On the basis of geological setting of HED parent body, we envision that these eucrites may have been located in the shallow ejecta blanket of the HED-parent body, judging from the high mixing ratio of unequilibrated clasts and low degree of equilibration of pyroxene. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Antarctic The ''Y'' ENVELOPE(-112.453,-112.453,57.591,57.591) |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
In order to obtain better understanding of the entire range of Antarctic brecciated eucrites and impact and thermal history of the HED-parent body, we studied brecciated Antarctic eucrites : Y-82202,Y-82210,Y-793548,and Y-793570 mineralogically and petrographically. Y-793548,Y-82210,and Y-793570 are nearly monomict breccias with clasts components of rapidly cooled materials and minor slowly cooled pyroxenes (e. g., Juvinastype). Y-82202 is a monomict breccia penetrated by glassy shock melt veins. We suggest that the polished thin sections of the five eucrites presently available belong to a single suite which contains mostly quickly cooled varieties of eucrites similar to those in Pasamonte or in the Y-74159-type polymict eucrites, but more slowly cooled varieties such as ordinary eucrites or cumulate eucrites are scarce in these sections. On the basis of geological setting of HED parent body, we envision that these eucrites may have been located in the shallow ejecta blanket of the HED-parent body, judging from the high mixing ratio of unequilibrated clasts and low degree of equilibration of pyroxene. |
format |
Report |
author |
Akira Yamaguchi Hiroshi Takeda |
spellingShingle |
Akira Yamaguchi Hiroshi Takeda Mineralogical study of some brecciated Antarctic eucrites |
author_facet |
Akira Yamaguchi Hiroshi Takeda |
author_sort |
Akira Yamaguchi |
title |
Mineralogical study of some brecciated Antarctic eucrites |
title_short |
Mineralogical study of some brecciated Antarctic eucrites |
title_full |
Mineralogical study of some brecciated Antarctic eucrites |
title_fullStr |
Mineralogical study of some brecciated Antarctic eucrites |
title_full_unstemmed |
Mineralogical study of some brecciated Antarctic eucrites |
title_sort |
mineralogical study of some brecciated antarctic eucrites |
publisher |
Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo |
publishDate |
1992 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4581 http://id.nii.ac.jp/1291/00004581/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4581&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(-112.453,-112.453,57.591,57.591) |
geographic |
Antarctic The ''Y'' |
geographic_facet |
Antarctic The ''Y'' |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4581 http://id.nii.ac.jp/1291/00004581/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 5, 242-257(1992-03) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4581&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250628618649600 |