Rare-Earth Geochemistry of Antarctic Diogenites
P(論文) Rare-earth elements (REE) were determined for seven diogenite samples (four whole rock samples, two separate fractions and one handpicked orthopyroxene sample), prepared from Yamato-74010,-74013,-74037 and -74136. Diogenites, Yamato-74037 and -74136,have positive Ce anomalies of 14 and 17%, re...
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ftnipr:oai:nipr.repo.nii.ac.jp:00001052 2024-09-09T19:01:53+00:00 Rare-Earth Geochemistry of Antarctic Diogenites Masuda, Akimasa Tanaka, Tsuyoshi Shimizu, Hiroshi Wakisaka, Takeshi Nakamura, Noboru 1979-12 application/pdf https://nipr.repo.nii.ac.jp/record/1052/files/KJ00000011596.pdf eng eng Memoirs of National Institute of Polar Research. Special issue 15 177 188 AA00733561 https://nipr.repo.nii.ac.jp/record/1052/files/KJ00000011596.pdf 1979 ftnipr 2024-06-17T04:00:22Z P(論文) Rare-earth elements (REE) were determined for seven diogenite samples (four whole rock samples, two separate fractions and one handpicked orthopyroxene sample), prepared from Yamato-74010,-74013,-74037 and -74136. Diogenites, Yamato-74037 and -74136,have positive Ce anomalies of 14 and 17%, respectively. REE distribution has been found to be heterogeneous even in the same sample (Yamato-74010) of the size less than 2g without any apparent distinctions in itself. The Lu contents are generally lower than in diogenites studied by FUKUOKA et al. (1977) and SCHMITT et al. (1963). Unlike diogenites examined by these authors, REE patterns of a large fraction of Antarctic diogenites show marked turning-up toward the lightest REE. Diogenite Yamato-74010 was separated into four fractions, with the special aim of collection of a floating ultrafine-grained fraction. This fraction and a coarse-grained one display contrasting differences in Eu anomaly as well as Na content. Assuming that, in ideally the simplest case, the REE partition coefficient function for orthopyroxene is a logarithmically linear function of difference in atomic number, a function responsible for turning-up towards the lighter REE was evaluated. Regardless of mutually opposite signs, the absolute magnitude of inclination coefficient for this function is similar to that for the function ideally assumed for simple orthopyroxene effect. departmental bulletin paper Other/Unknown Material Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
P(論文) Rare-earth elements (REE) were determined for seven diogenite samples (four whole rock samples, two separate fractions and one handpicked orthopyroxene sample), prepared from Yamato-74010,-74013,-74037 and -74136. Diogenites, Yamato-74037 and -74136,have positive Ce anomalies of 14 and 17%, respectively. REE distribution has been found to be heterogeneous even in the same sample (Yamato-74010) of the size less than 2g without any apparent distinctions in itself. The Lu contents are generally lower than in diogenites studied by FUKUOKA et al. (1977) and SCHMITT et al. (1963). Unlike diogenites examined by these authors, REE patterns of a large fraction of Antarctic diogenites show marked turning-up toward the lightest REE. Diogenite Yamato-74010 was separated into four fractions, with the special aim of collection of a floating ultrafine-grained fraction. This fraction and a coarse-grained one display contrasting differences in Eu anomaly as well as Na content. Assuming that, in ideally the simplest case, the REE partition coefficient function for orthopyroxene is a logarithmically linear function of difference in atomic number, a function responsible for turning-up towards the lighter REE was evaluated. Regardless of mutually opposite signs, the absolute magnitude of inclination coefficient for this function is similar to that for the function ideally assumed for simple orthopyroxene effect. departmental bulletin paper |
author |
Masuda, Akimasa Tanaka, Tsuyoshi Shimizu, Hiroshi Wakisaka, Takeshi Nakamura, Noboru |
spellingShingle |
Masuda, Akimasa Tanaka, Tsuyoshi Shimizu, Hiroshi Wakisaka, Takeshi Nakamura, Noboru Rare-Earth Geochemistry of Antarctic Diogenites |
author_facet |
Masuda, Akimasa Tanaka, Tsuyoshi Shimizu, Hiroshi Wakisaka, Takeshi Nakamura, Noboru |
author_sort |
Masuda, Akimasa |
title |
Rare-Earth Geochemistry of Antarctic Diogenites |
title_short |
Rare-Earth Geochemistry of Antarctic Diogenites |
title_full |
Rare-Earth Geochemistry of Antarctic Diogenites |
title_fullStr |
Rare-Earth Geochemistry of Antarctic Diogenites |
title_full_unstemmed |
Rare-Earth Geochemistry of Antarctic Diogenites |
title_sort |
rare-earth geochemistry of antarctic diogenites |
publishDate |
1979 |
url |
https://nipr.repo.nii.ac.jp/record/1052/files/KJ00000011596.pdf |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Antarctic Yamato |
geographic_facet |
Antarctic Yamato |
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 |
Memoirs of National Institute of Polar Research. Special issue 15 177 188 AA00733561 https://nipr.repo.nii.ac.jp/record/1052/files/KJ00000011596.pdf |
_version_ |
1809815678845190144 |