REE adundances and Rb-Sr geochronology of Yamato-791197
The REE abundances and the Sr isotopic compositions were determined for the separated samples and the clast sample of the "lunar meteorite", Yamato-791197. Most of the features of the REE patterns are similar to those of the lunar highland samples, especially a kind of anorthosites. And th...
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Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00001955 2023-05-15T17:10:59+02:00 REE adundances and Rb-Sr geochronology of Yamato-791197 Kazuya Takahashi Akimasa Masuda Hiroshi Shimizu 1986-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1955 http://id.nii.ac.jp/1291/00001955/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1955&item_no=1&attribute_id=18&file_no=1 en eng Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1955 http://id.nii.ac.jp/1291/00001955/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 96-105(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1955&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:46Z The REE abundances and the Sr isotopic compositions were determined for the separated samples and the clast sample of the "lunar meteorite", Yamato-791197. Most of the features of the REE patterns are similar to those of the lunar highland samples, especially a kind of anorthosites. And the positive Ce-anomalies, shown in all REE patterns, appear characteristic of the lunar origin. The age obtained from the Rb-Sr system is 3.89±0.36 b. y. and it is considered that this age shows the time when these materials underwent an event, such as brecciation or impact melting. However, as a noticeable point, the initial ^<87>Sr/^<86>Sr is significantly low, even lower than BABI or LUNI. This result suggests that the source material of these samples might have had very low ^<87>Sr/^<86>Sr and Rb/Sr abundance ratios. The clast sample from the chip subordinate No. 109 has the distinct REE pattern and Sr-isotope ratio. Therefore, this clast can be considered to have been formed by different evolution process from the other samples, and was mingled later with them. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan 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 REE abundances and the Sr isotopic compositions were determined for the separated samples and the clast sample of the "lunar meteorite", Yamato-791197. Most of the features of the REE patterns are similar to those of the lunar highland samples, especially a kind of anorthosites. And the positive Ce-anomalies, shown in all REE patterns, appear characteristic of the lunar origin. The age obtained from the Rb-Sr system is 3.89±0.36 b. y. and it is considered that this age shows the time when these materials underwent an event, such as brecciation or impact melting. However, as a noticeable point, the initial ^<87>Sr/^<86>Sr is significantly low, even lower than BABI or LUNI. This result suggests that the source material of these samples might have had very low ^<87>Sr/^<86>Sr and Rb/Sr abundance ratios. The clast sample from the chip subordinate No. 109 has the distinct REE pattern and Sr-isotope ratio. Therefore, this clast can be considered to have been formed by different evolution process from the other samples, and was mingled later with them. |
format |
Report |
author |
Kazuya Takahashi Akimasa Masuda Hiroshi Shimizu |
spellingShingle |
Kazuya Takahashi Akimasa Masuda Hiroshi Shimizu REE adundances and Rb-Sr geochronology of Yamato-791197 |
author_facet |
Kazuya Takahashi Akimasa Masuda Hiroshi Shimizu |
author_sort |
Kazuya Takahashi |
title |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
title_short |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
title_full |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
title_fullStr |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
title_full_unstemmed |
REE adundances and Rb-Sr geochronology of Yamato-791197 |
title_sort |
ree adundances and rb-sr geochronology of yamato-791197 |
publisher |
Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo/Department of Chemistry, The University of Tokyo |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1955 http://id.nii.ac.jp/1291/00001955/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1955&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Yamato |
geographic_facet |
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=1955 http://id.nii.ac.jp/1291/00001955/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 41, 96-105(1986-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1955&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067784260780032 |