{"created":"2023-07-25T10:59:31.536028+00:00","id":1219,"links":{},"metadata":{"_buckets":{"deposit":"c537c88a-4f0d-42d0-b7be-2411285b2575"},"_deposit":{"created_by":4,"id":"1219","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"1219"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00001219","sets":["1:356:374"]},"author_link":["934"],"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1981-12","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"263","bibliographicPageStart":"250","bibliographicVolumeNumber":"20","bibliographic_titles":[{"bibliographic_title":"Memoirs of National Institute of Polar Research. Special issue"}]}]},"item_1_creator_8":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Kaneoka, Ichiro","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_1_description_1":{"attribute_name":"ページ属性","attribute_value_mlt":[{"subitem_description":"P(論文)","subitem_description_type":"Other"}]},"item_1_description_12":{"attribute_name":"抄録(英)","attribute_value_mlt":[{"subitem_description":"The ^<40>(Ar)-^<39>(Ar) ages have been determined for two chondrites (Y-74191,Y-75258), one howardite (Y-7308) and two eucrites (Y-74450,ALH-765) from Antarctica. Y-74191 (L3) shows a disturbed age spectrum with a maximum apparent age of 4506±31 Ma in the intermediate temperature fraction. Y-75258 (LL6) shows a plateau age of 4377±14 Ma at higher temperatures except for the highest temperature fraction. A howardite Y-7308 has an inversed age spectrum, but the intermediate temperature fractions indicate a plateau-like age of 4480±30 Ma. The apparent very old age at the lowest temperature might have been caused either by the effect of atmospheric contamination to the sample or by the redistribution of radiogenic ^<40>(Ar) in the sample. One eucrite Y-74450 shows a plateau age of 4012±22 Ma, indicating a later thermal event on the parent body of the meteorite. The other eucrite ALH-765 indicates a gradual increase in the apparent ^<40>(Ar)-^<39>(Ar) ages with increasing degassing temperature, but even the highest temperature fraction shows an age of about 3700 Ma. The present results together with those of reported ^<40>(Ar)-^<39>(Ar) and K-Ar ages suggest that meteorites found in Antarctica represent thermal histories very different from one another.","subitem_description_type":"Other"}]},"item_1_source_id_13":{"attribute_name":"雑誌書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AA00733561","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":"Geological Institute, Faculty of Science, University of Tokyo"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1981-12-01"}],"displaytype":"detail","filename":"KJ00000011745.pdf","filesize":[{"value":"2.8 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00000011745","url":"https://nipr.repo.nii.ac.jp/record/1219/files/KJ00000011745.pdf"},"version_id":"e9650530-586a-4762-9b57-7e70cd9af11e"}]},"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":"40Ar-39Ar ages of Antarctic meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"40Ar-39Ar ages of Antarctic meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["374"],"pubdate":{"attribute_name":"公開日","attribute_value":"1981-12-01"},"publish_date":"1981-12-01","publish_status":"0","recid":"1219","relation_version_is_last":true,"title":["40Ar-39Ar ages of Antarctic meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T13:58:47.380500+00:00"}