{"created":"2023-07-25T10:59:20.454270+00:00","id":968,"links":{},"metadata":{"_buckets":{"deposit":"52a506d0-1adf-4dcd-89df-8be110ecb397"},"_deposit":{"created_by":4,"id":"968","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"968"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00000968","sets":["1:356:366"]},"author_link":["56241","829","56242"],"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1979-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"206","bibliographicPageStart":"186","bibliographicVolumeNumber":"12","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":[{}]},{"creatorNames":[{"creatorName":"Ozima, Minoru","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Yanagisawa, Masahisa","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":"^<40>(Ar)-^<39>(Ar) ages have been obtained for four Yamato-74 meteorites (Yamato-74640,-74190,-74159 and -74097) from Antarctica. Yamato-74640 (H5-6) shows a plateau age of 4407±71 m.y. (1σ) at higher temperatures. This age probably corresponds to the time of formation or a very intense metamorphism for this meteorite. Yamato-74190 (L6) indicates a ^<40>(Ar)-^<89>(Ar) age spectrum with a low temperature plateau-like age of 357±32 m.y. The apparent ^<40>(Ar)-^<39>(Ar) age increases up to about 1300 m.y., but does not reach a high temperature plateau. The apparent young age would reflect the time of degassing due to the collisional process of the parent body, which has been observed in many L-chondrites. Yamato-74159,which is a eucritic polymict breccia, has a similar age spectrum to that of Pasamonte obtained by PODOSEK and HUNEKE (Geochim. Cosmochim. Acta, 37,667,1973), indicating a plateau age of 4075±49 m.y. at intermediate temperatures (850-1250℃). This age may reflect the time of the later degassing event such as the impact of meteoroids on the parent body of the eucrite. Yamato-74097 (Diogenite) seems to show a relatively young ^<40>(Ar)-^<39>(Ar) age of about 1100 m.y., though the uncertainty in the obtained age is larger for this diogenite than those for the other samples due to its low K-content. From both the value of the age and the age spectrum, this diogenite seems to have a different history from those of ordinary chondrites and achondrites known to date.","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":"Geophysical Institute, Faculty of Science, University of Tokyo"},{"subitem_text_language":"en","subitem_text_value":"Geophysical Institute, Faculty of Science, University of Tokyo"},{"subitem_text_language":"en","subitem_text_value":"Geophysical 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":"1979-03-01"}],"displaytype":"detail","filename":"KJ00000011514.pdf","filesize":[{"value":"2.7 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00000011514","url":"https://nipr.repo.nii.ac.jp/record/968/files/KJ00000011514.pdf"},"version_id":"7343c38c-a1f3-40e4-94f3-cabd022ef50c"}]},"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 Age Studies of Four Yamato-74 Meteorites","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"40Ar-39Ar Age Studies of Four Yamato-74 Meteorites","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["366"],"pubdate":{"attribute_name":"公開日","attribute_value":"1979-03-01"},"publish_date":"1979-03-01","publish_status":"0","recid":"968","relation_version_is_last":true,"title":["40Ar-39Ar Age Studies of Four Yamato-74 Meteorites"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T14:05:05.523856+00:00"}