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On a three oxygen-isotope plot, all the inclusions lie near the H-chondrite field. The Y-75097 host and inclusion were severely shocked and the Rb-Sr systematics were disturbed by a 500Ma event which was defined by the K-Ar age. The Y-793241 host and inclusion are unshocked and have an old K-Ar age of 4270±170Ma and undisturbed Rb-Sr systematics for the bulk meteorite. Both Y-75097 and Y-793241 inclusions have similar chemical compositions and mineral assemblages consisting mainly of olivine (Fa_\u003c25\u003e), and minor plagioclase (An_\u003c12-19\u003e), chlor-apatite, merrillite and chromite. Olivines in both inclusions equilibrated with those of their L6 hosts. The two inclusion mantles consisting of mainly olivine and plagioclase show a highly fractionated REE pattern with middle REE depletion and a large positive Eu anomaly (50-100 times chondritic) (V-shaped). A model calculation suggests that this remarkable REE fractionation was produced by thermal equilibration with the phosphate-rich cores of inclusions during the igneous formation and the metamorphic event. The Y-794046 inclusion comprises abundant anhedral olivines (Fa_\u003c20.5\u003e), fractured pyroxenes (Fs_\u003c14-16.5\u003e) and microcrystalline plagioclase (An_\u003c3-5\u003eAb_\u003c81-96\u003eOr_\u003c0-16\u003e). The inclusion did not equilibrate with its host which has less Fe-rich olivines (Fa_\u003c19\u003e) and more Fe in pyroxenes (Fs_\u003c17.5\u003e). The inclusion shows an unfractionated REE pattern. We suggest that the three inclusions formed by melting of differentiated precursor materials carrying unfractionated REE. They were then incorporated into the L-or H-chondrite parent bodies and subjected to the early thermal metamorphism, which eventually overprinted the fractionated REE in the Y-75097 and Y-793241 inclusions by solid/solid equilibrium partitioning. The Y-794046 inclusion was subjected to less extensive equilibration, so that REE abundances remained unfractionated.", "subitem_description_type": "Other"}]}, "item_1_identifier_registration": {"attribute_name": "ID登録", "attribute_value_mlt": [{"subitem_identifier_reg_text": "10.15094/00004641", "subitem_identifier_reg_type": "JaLC"}]}, "item_1_publisher_22": {"attribute_name": "出版者", "attribute_value_mlt": [{"subitem_publisher": "National Institute of Polar Research"}]}, "item_1_source_id_13": {"attribute_name": "雑誌書誌ID", "attribute_value_mlt": [{"subitem_source_identifier": "AA10784627", "subitem_source_identifier_type": "NCID"}]}, "item_1_text_10": {"attribute_name": "著者所属(英)", "attribute_value_mlt": [{"subitem_text_language": "en", "subitem_text_value": "Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Mineralogy, The Natural History Museum/Enrico Fermi Institute, University of Chicago/Enrico Fermi Institute, University of Chicago/Institute for Study of the Earth\u0027s Interior, Okayama University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Geosciences, Faculty of Science, Okayama University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/National Institute of Polar Research"}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "1994-03-01"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "KJ00000036447.pdf", "filesize": [{"value": "2.0 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_6", "mimetype": "application/pdf", "size": 2000000.0, "url": {"label": "KJ00000036447", "url": "https://nipr.repo.nii.ac.jp/record/4641/files/KJ00000036447.pdf"}, "version_id": "1945d583-1d30-4700-af09-84efbc2077f0"}]}, "item_language": {"attribute_name": "言語", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "資源タイプ", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Trace element and isotopic characteristics of inclusions in the Yamato ordinary chondrites Y-75097, Y-793241 and Y-794046", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "Trace element and isotopic characteristics of inclusions in the Yamato ordinary chondrites Y-75097, Y-793241 and Y-794046"}]}, "item_type_id": "1", "owner": "4", "path": ["591"], "permalink_uri": "https://doi.org/10.15094/00004641", "pubdate": {"attribute_name": "公開日", "attribute_value": "1994-03-01"}, "publish_date": "1994-03-01", "publish_status": "0", "recid": "4641", "relation": {}, "relation_version_is_last": true, "title": ["Trace element and isotopic characteristics of inclusions in the Yamato ordinary chondrites Y-75097, Y-793241 and Y-794046"], "weko_shared_id": 4}
Trace element and isotopic characteristics of inclusions in the Yamato ordinary chondrites Y-75097, Y-793241 and Y-794046
https://doi.org/10.15094/00004641
https://doi.org/10.15094/00004641ff9dfc0f-97c2-426b-be65-61c9632ac58d
名前 / ファイル | ライセンス | アクション |
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KJ00000036447 (2.0 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-03-01 | |||||
タイトル | ||||||
タイトル | Trace element and isotopic characteristics of inclusions in the Yamato ordinary chondrites Y-75097, Y-793241 and Y-794046 | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00004641 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Nakamura, Noboru
× Nakamura, Noboru× Morikawa, Noritoshi× Hutchison, Robert× Clayton, Robert N.× Mayeda, Toshiko K.× Nagao, Keisuke× Misawa, Keiji× Okano, Osamu× Yanai, Keizo× Matsumoto, Yukio |
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著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Mineralogy, The Natural History Museum/Enrico Fermi Institute, University of Chicago/Enrico Fermi Institute, University of Chicago/Institute for Study of the Earth's Interior, Okayama University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/Department of Geosciences, Faculty of Science, Okayama University/Department of Earth and Planetary Sciences, Faculty of Science, Kobe University/National Institute of Polar Research | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Igneous inclusions and hosts of the Yamato ordinary chondrites Y-75097 (L6), Y-793241 (L6) and Y-794046 (H5) were analyzed for lithophile trace elements, and Rb-Sr, rare gas and oxygen isotopes, together with preliminary petrographic examinations. On a three oxygen-isotope plot, all the inclusions lie near the H-chondrite field. The Y-75097 host and inclusion were severely shocked and the Rb-Sr systematics were disturbed by a 500Ma event which was defined by the K-Ar age. The Y-793241 host and inclusion are unshocked and have an old K-Ar age of 4270±170Ma and undisturbed Rb-Sr systematics for the bulk meteorite. Both Y-75097 and Y-793241 inclusions have similar chemical compositions and mineral assemblages consisting mainly of olivine (Fa_<25>), and minor plagioclase (An_<12-19>), chlor-apatite, merrillite and chromite. Olivines in both inclusions equilibrated with those of their L6 hosts. The two inclusion mantles consisting of mainly olivine and plagioclase show a highly fractionated REE pattern with middle REE depletion and a large positive Eu anomaly (50-100 times chondritic) (V-shaped). A model calculation suggests that this remarkable REE fractionation was produced by thermal equilibration with the phosphate-rich cores of inclusions during the igneous formation and the metamorphic event. The Y-794046 inclusion comprises abundant anhedral olivines (Fa_<20.5>), fractured pyroxenes (Fs_<14-16.5>) and microcrystalline plagioclase (An_<3-5>Ab_<81-96>Or_<0-16>). The inclusion did not equilibrate with its host which has less Fe-rich olivines (Fa_<19>) and more Fe in pyroxenes (Fs_<17.5>). The inclusion shows an unfractionated REE pattern. We suggest that the three inclusions formed by melting of differentiated precursor materials carrying unfractionated REE. They were then incorporated into the L-or H-chondrite parent bodies and subjected to the early thermal metamorphism, which eventually overprinted the fractionated REE in the Y-75097 and Y-793241 inclusions by solid/solid equilibrium partitioning. The Y-794046 inclusion was subjected to less extensive equilibration, so that REE abundances remained unfractionated. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10784627 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 7, p. 125-143, 発行日 1994-03 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |