Cerium anomaly in REE pattern of Antarctic eucrite
To examine the weathering effect, we determined abundances of rare-earth elements (REE), Ba and Sr and contents of major elements (MgO, FeO, CaO, MnO and (Na)_2O) for inner and outer parts of the ALH-78132 Antarctic eucrite. It was observed that the inner part of this eucrite (ALH-78132,78) showed a...
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Department of Chemistry, Faculty of Science,The University of Tokyo
1983
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ftnipr:oai:nipr.repo.nii.ac.jp:00001572 2023-05-15T13:47:59+02:00 Cerium anomaly in REE pattern of Antarctic eucrite Hiroshi Shimizu Akimasa Masuda Tsuyoshi Tanaka 1983-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1572 http://id.nii.ac.jp/1291/00001572/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1572&item_no=1&attribute_id=18&file_no=1 en eng Department of Chemistry, Faculty of Science,The University of Tokyo Geological Survey of Japan https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1572 http://id.nii.ac.jp/1291/00001572/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 30, 341-348(1983-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1572&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1983 ftnipr 2022-11-12T19:42:23Z To examine the weathering effect, we determined abundances of rare-earth elements (REE), Ba and Sr and contents of major elements (MgO, FeO, CaO, MnO and (Na)_2O) for inner and outer parts of the ALH-78132 Antarctic eucrite. It was observed that the inner part of this eucrite (ALH-78132,78) showed a negative Ce anomaly, while all of the outer part specimens (ALH-78132,71a, b, c and 79) displayed positive Ce anomalies. On the other hand, contents of MgO, FeO and CaO for the outer part of the eucrite were similar to those for the inner part of the eucrite. Ce and Nd isotopic ratios were also determined for ALH-78132,71c, 79 and 78. In the ^<143>(Nd)/^<144>(Nd) vs. ^<147>(Sm)/^<144>(Nd) diagram, all points of ALH-78132,71c, 79 and 78 appeared to fall in the chondritic evolution field within the experimental errors. Meanwhile, in the ^<138>(Ce)/^<142>(Ce) vs. ^<138>(La)/^<142>(Ce) diagram, it was observed that the points of the outer part specimens, ALH-78132,71c and 79,deviated from the chondritic lines, while the point of inner part sample of ALH-78132,78 lied in the chondritic range within the experimental uncertainty. These results suggest strongly that the positive Ce anomaly of the Antarctic eucrite is a result of terrestrial weathering. Report Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic The Antarctic Lied ENVELOPE(65.532,65.532,-70.502,-70.502) |
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National Institute of Polar Research Repository, Japan |
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English |
description |
To examine the weathering effect, we determined abundances of rare-earth elements (REE), Ba and Sr and contents of major elements (MgO, FeO, CaO, MnO and (Na)_2O) for inner and outer parts of the ALH-78132 Antarctic eucrite. It was observed that the inner part of this eucrite (ALH-78132,78) showed a negative Ce anomaly, while all of the outer part specimens (ALH-78132,71a, b, c and 79) displayed positive Ce anomalies. On the other hand, contents of MgO, FeO and CaO for the outer part of the eucrite were similar to those for the inner part of the eucrite. Ce and Nd isotopic ratios were also determined for ALH-78132,71c, 79 and 78. In the ^<143>(Nd)/^<144>(Nd) vs. ^<147>(Sm)/^<144>(Nd) diagram, all points of ALH-78132,71c, 79 and 78 appeared to fall in the chondritic evolution field within the experimental errors. Meanwhile, in the ^<138>(Ce)/^<142>(Ce) vs. ^<138>(La)/^<142>(Ce) diagram, it was observed that the points of the outer part specimens, ALH-78132,71c and 79,deviated from the chondritic lines, while the point of inner part sample of ALH-78132,78 lied in the chondritic range within the experimental uncertainty. These results suggest strongly that the positive Ce anomaly of the Antarctic eucrite is a result of terrestrial weathering. |
format |
Report |
author |
Hiroshi Shimizu Akimasa Masuda Tsuyoshi Tanaka |
spellingShingle |
Hiroshi Shimizu Akimasa Masuda Tsuyoshi Tanaka Cerium anomaly in REE pattern of Antarctic eucrite |
author_facet |
Hiroshi Shimizu Akimasa Masuda Tsuyoshi Tanaka |
author_sort |
Hiroshi Shimizu |
title |
Cerium anomaly in REE pattern of Antarctic eucrite |
title_short |
Cerium anomaly in REE pattern of Antarctic eucrite |
title_full |
Cerium anomaly in REE pattern of Antarctic eucrite |
title_fullStr |
Cerium anomaly in REE pattern of Antarctic eucrite |
title_full_unstemmed |
Cerium anomaly in REE pattern of Antarctic eucrite |
title_sort |
cerium anomaly in ree pattern of antarctic eucrite |
publisher |
Department of Chemistry, Faculty of Science,The University of Tokyo |
publishDate |
1983 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1572 http://id.nii.ac.jp/1291/00001572/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1572&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(65.532,65.532,-70.502,-70.502) |
geographic |
Antarctic The Antarctic Lied |
geographic_facet |
Antarctic The Antarctic Lied |
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=1572 http://id.nii.ac.jp/1291/00001572/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 30, 341-348(1983-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1572&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248289162756096 |