{"created":"2023-07-25T10:59:57.405222+00:00","id":1732,"links":{},"metadata":{"_buckets":{"deposit":"86b501b7-e639-47a4-9612-7d8cdad2f022"},"_deposit":{"created_by":4,"id":"1732","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"1732"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00001732","sets":["1:356:389"]},"author_link":["21583","57962","733","57961","9934"],"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1984-12","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"297","bibliographicPageStart":"285","bibliographicVolumeNumber":"35","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":"Okano, Osamu ","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Misawa, Keiji","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Nakamura, Noboru","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Honma, Hiroji","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Goto, Hiroya","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":"Rb-Sr systematics, REE, Ba, Sr, Rb, K, Ca and Mg abundances were analyzed in 1) whole-rock samples from 8 Antarctic LL-chondrites including 4 impact-melted rocks and 2 non-Antarctic LL chondrites, and 2) 8 mineral separates from one of the impact-melted meteorites, Y-790964. In a ^<87>(Rb)-^<87>(Sr) evolution diagram, analyses from the severely shocked meteorites deviate from the 4.5 b. y.-evolution line although those of normal LL-chondrites are plotted on or close to the line, suggesting a late thermal evolution of these impact-melted meteorites. Analyses of mineral separates and a whole-rock from Y-790964 yield a Rb-Sr internal isochron age of 1197±54 (2σ) m. y. and an initial ^<87>(Sr)/^<87>(Sr) ratio of 0.73160±0.00028 (2σ). This age is the youngest known among impact-related materials in brecciated meteorites. In addition, the impact-melted meteorites have somewhat higher and fractionated REE, Sr, Rb and K abundances compared with normal LL chondrites. The 1.2 b. y. age is interpreted as a time of melting induced by intense impacts on the LL-chondrite parent body, accompanied by REE, Rb/Sr and K fractionations. Therefore, we suggest that strong impact and regolith processes on the LL-chondrite parent body never ceased until at least 1.2 b. y. ago.","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":"Department of Science of Material Differentation, Graduate School of Science and Technology, Kobe University/Department of Earth Sciences, Faculty of Science, Kobe University/Department of Science of Material Differentation, Graduate School of Science and Technology, Kobe University/Institute for Thermal Spring Research, Okayama University/Laboratory of Geosciences,College of Liberal Arts, Kobe University"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1984-12-01"}],"displaytype":"detail","filename":"KJ00000012364.pdf","filesize":[{"value":"1.7 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00000012364","url":"https://nipr.repo.nii.ac.jp/record/1732/files/KJ00000012364.pdf"},"version_id":"bbf012e5-3ef5-4e3c-8ba5-53c6a82d3d82"}]},"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":"A preliminary study of Rb-Sr systematics and trace element abundances on impact-melted LL-chondrites from Antarctica","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"A preliminary study of Rb-Sr systematics and trace element abundances on impact-melted LL-chondrites from Antarctica","subitem_title_language":"en"}]},"item_type_id":"1","owner":"4","path":["389"],"pubdate":{"attribute_name":"公開日","attribute_value":"1984-12-01"},"publish_date":"1984-12-01","publish_status":"0","recid":"1732","relation_version_is_last":true,"title":["A preliminary study of Rb-Sr systematics and trace element abundances on impact-melted LL-chondrites from Antarctica"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T13:52:52.535358+00:00"}