Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites
The abundances of Mg, Ca, Fe, K, Rb, Sr, Ba, and REE in five Antarctic "unique" meteorites, acapulcoite-lodranite type, Yamato (Y)-74063,Y-74357,Y-8002,and Allan Hills (ALH)-78230,and winonaite type, Y-75300 were determined by isotope dilution mass spectrometry. The Sr isotopic composition...
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Department of Earth Science, Kobe University/Department of Earth Science, Kobe University/Institute for Cosmic Ray Research, University of Tokyo/Department of Earth Science, Kobe University
1993
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ftnipr:oai:nipr.repo.nii.ac.jp:00004604 2023-05-15T13:49:02+02:00 Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites Torigoye,Noriko Ymamoto,Koshi Misawa,Keiji Nakamura,Noboru 1993-05 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4604 http://id.nii.ac.jp/1291/00004604/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4604&item_no=1&attribute_id=18&file_no=1 en eng Department of Earth Science, Kobe University/Department of Earth Science, Kobe University/Institute for Cosmic Ray Research, University of Tokyo/Department of Earth Science, Kobe University National Institute of Polar Research https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4604 http://id.nii.ac.jp/1291/00004604/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 6, 100-119(1993-05) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4604&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1993 ftnipr 2023-02-04T20:06:16Z The abundances of Mg, Ca, Fe, K, Rb, Sr, Ba, and REE in five Antarctic "unique" meteorites, acapulcoite-lodranite type, Yamato (Y)-74063,Y-74357,Y-8002,and Allan Hills (ALH)-78230,and winonaite type, Y-75300 were determined by isotope dilution mass spectrometry. The Sr isotopic compositions of Y-74063,Y-75300,Y-8002,and ALH-78230 were also measured to investigate the whole-rock Rb-Sr isotopic systematics. In terms of the REE abundance pattern, these meteorites are grouped as follows; (1) Y-74063 and ALH-78230 with chondritic REE patterns, (2) Y-74357 with light REE depletion plus alkali and alkaline earth element depletion, and (3) Y-75300 and Y-8002 with middle REE depletion (V-shaped REE pattern) plus a positive Eu anomaly). The mineralogy of these meteorites is closely related to the above REE classification. The ^<87>Rb-^<87>Sr age determined from 'whole-rock samples' for Y-74063,Y-75300,Y-8002,and ALH-78230 is consistent with their formation of 4.5Ga, albeit with a large uncertainty due to the blank correction. Using the mineral/liquid partition coefficients of trace elements, the petrogenetic model calculations were performed. The results give indication on the origin of these "unique" meteorites. Y-74063 and ALH-78230 could be formed through a small degree of partial melting (less than a few%) from a chondritic starting material. Y-74357 could be formed by a larger degree (12%) of partial melting. On the other hand, the V-shaped REE pattern of the third group (Y-75300 and Y-8002) could not be explained by a simple partial melting process. The V-shaped REE pattern may be explained only by assuming the solid state equilibration within a reservoir with chondritic composition. It is suggested that Y-75300 and Y-8002 might be derived from parental materials depleted in phosphate and clinopyroxene. Report Antarc* Antarctic National Institute of Polar Research Repository, Japan Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Antarctic Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
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National Institute of Polar Research Repository, Japan |
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language |
English |
description |
The abundances of Mg, Ca, Fe, K, Rb, Sr, Ba, and REE in five Antarctic "unique" meteorites, acapulcoite-lodranite type, Yamato (Y)-74063,Y-74357,Y-8002,and Allan Hills (ALH)-78230,and winonaite type, Y-75300 were determined by isotope dilution mass spectrometry. The Sr isotopic compositions of Y-74063,Y-75300,Y-8002,and ALH-78230 were also measured to investigate the whole-rock Rb-Sr isotopic systematics. In terms of the REE abundance pattern, these meteorites are grouped as follows; (1) Y-74063 and ALH-78230 with chondritic REE patterns, (2) Y-74357 with light REE depletion plus alkali and alkaline earth element depletion, and (3) Y-75300 and Y-8002 with middle REE depletion (V-shaped REE pattern) plus a positive Eu anomaly). The mineralogy of these meteorites is closely related to the above REE classification. The ^<87>Rb-^<87>Sr age determined from 'whole-rock samples' for Y-74063,Y-75300,Y-8002,and ALH-78230 is consistent with their formation of 4.5Ga, albeit with a large uncertainty due to the blank correction. Using the mineral/liquid partition coefficients of trace elements, the petrogenetic model calculations were performed. The results give indication on the origin of these "unique" meteorites. Y-74063 and ALH-78230 could be formed through a small degree of partial melting (less than a few%) from a chondritic starting material. Y-74357 could be formed by a larger degree (12%) of partial melting. On the other hand, the V-shaped REE pattern of the third group (Y-75300 and Y-8002) could not be explained by a simple partial melting process. The V-shaped REE pattern may be explained only by assuming the solid state equilibration within a reservoir with chondritic composition. It is suggested that Y-75300 and Y-8002 might be derived from parental materials depleted in phosphate and clinopyroxene. |
format |
Report |
author |
Torigoye,Noriko Ymamoto,Koshi Misawa,Keiji Nakamura,Noboru |
spellingShingle |
Torigoye,Noriko Ymamoto,Koshi Misawa,Keiji Nakamura,Noboru Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
author_facet |
Torigoye,Noriko Ymamoto,Koshi Misawa,Keiji Nakamura,Noboru |
author_sort |
Torigoye,Noriko |
title |
Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
title_short |
Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
title_full |
Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
title_fullStr |
Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
title_full_unstemmed |
Compositions of REE, K, Rb, Sr, Ba, Mg, Ca, Fe, and Sr isotopes in Antarctic"unique" meteorites |
title_sort |
compositions of ree, k, rb, sr, ba, mg, ca, fe, and sr isotopes in antarctic"unique" meteorites |
publisher |
Department of Earth Science, Kobe University/Department of Earth Science, Kobe University/Institute for Cosmic Ray Research, University of Tokyo/Department of Earth Science, Kobe University |
publishDate |
1993 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4604 http://id.nii.ac.jp/1291/00004604/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4604&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Allan Hills Antarctic Yamato |
geographic_facet |
Allan Hills Antarctic Yamato |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=4604 http://id.nii.ac.jp/1291/00004604/ AA10784627 Proceedings of the NIPR Symposium on Antarctic Meteorites, 6, 100-119(1993-05) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=4604&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766250630165299200 |