{"created":"2021-03-01T06:34:10.829900+00:00","id":26269,"links":{},"metadata":{"_buckets":{"deposit":"c1671acd-4469-4fef-bebf-c477c0ecf65b"},"_deposit":{"id":"26269","owners":[],"pid":{"revision_id":0,"type":"depid","value":"26269"},"status":"published"},"_oai":{"id":"oai:nagoya.repo.nii.ac.jp:00026269","sets":["879:1183:2103:2104"]},"author_link":["78872","78873","78874","78875","78876","78877","78878","78879","78880","78881"],"item_1615768549627":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_9_alternative_title_19":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Age comparison between Matuyama-Brunhes geomagnetic polarity reversal and tektite fall","subitem_alternative_title_language":"en"}]},"item_9_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2017-03-31","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"77","bibliographicPageStart":"72","bibliographicVolumeNumber":"1","bibliographic_titles":[{"bibliographic_title":"名古屋大学年代測定研究","bibliographic_titleLang":"ja"}]}]},"item_9_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The youngest geomagnetic polarity reversal, the Matuyama-Brunhes boundary (MBB), was dated precisely to 770.2 ± 7.3 ka by the U-Pb zircon method from a marine-deposited tephra just below the MBB. This age is quite close to the big tektite impact event that occurred in Southeast Asia. A big impact shock can potentially reset the magnetic susceptibility. Dating of the tektite itself by the K-Ar and Ar-Ar methods indicated an age of approximately 700—750 ka. The reported periods were somewhat doubtful, however, as the dating techniques used for the measurements were still immature. This paper reports the latest K-Ar dates for tektites found in Vietnam and Thailand, as well as geochemical similarities between these two tektites.","subitem_description_language":"en","subitem_description_type":"Abstract"},{"subitem_description":"上総層群中に見出される松山—ブルン地磁気逆転期（MBB）の地層直近下位に存在する火山灰層に含まれるジルコンのU-Pb年代から、MBBの年代は770kaであることが明らかにされた。他方、東南アジアからオーストラリアにかけてのテクタイトの落下もほぼ同時期とされてきた。テクタイトを形成した巨大隕石の落下衝撃は、地磁気の消滅・逆転の引き金とはならなかったか？ 本研究では、衝撃による溶融ガラスとされるテクタイト自体のK-Ar年代測定法による巨大インパクトの年代の精密測定を試みた。ベトナムおよびタイのテクタイト試料の化学組成はきわめて良く一致しており、遠く離れた地域のテクタイトが同じクレータに由来するであろうことが判った。2つのテクタイトのK-Ar年代は約60万年であり、これまでに報告されてきた値より若い年代値が得られた。地域的変動の有無を明らかにするため、他の地域のテクタイトについてもより詳細な年代測定が望まれる。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.18999/nagubc.1.72","subitem_identifier_reg_type":"JaLC"}]},"item_9_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"名古屋大学宇宙地球環境研究所年代測定研究部","subitem_publisher_language":"ja"}]},"item_9_select_15":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"publisher"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"淺原, 良浩","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"78872","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Lee, Seung-Gu","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78873","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"南, 雅代","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"78874","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Choi, Jisu","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78875","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"長尾, 敬介","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"78876","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"田中, 剛","creatorNameLang":"ja"}],"nameIdentifiers":[{"nameIdentifier":"78877","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Asahara, Yoshihiro","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78878","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Minami, Masayo","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78879","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Nagao, Keisuke","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78880","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Tanaka, Tsuyoshi","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"78881","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2018-08-17"}],"displaytype":"detail","filename":"072-077_2016.pdf","filesize":[{"value":"2.4 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"072-077_2016.pdf","objectType":"fulltext","url":"https://nagoya.repo.nii.ac.jp/record/26269/files/072-077_2016.pdf"},"version_id":"6d32f231-fda6-4f81-a35c-d421853e1e03"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"tektite impact event","subitem_subject_scheme":"Other"},{"subitem_subject":"Matuyama-Brunhes geomagnetic polarity reversal","subitem_subject_scheme":"Other"},{"subitem_subject":"K-Ar dating","subitem_subject_scheme":"Other"},{"subitem_subject":"テクタイト衝撃形成","subitem_subject_scheme":"Other"},{"subitem_subject":"松山—ブルン地磁気逆転期","subitem_subject_scheme":"Other"},{"subitem_subject":"K-Ar放射年代測定","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"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":"松山‐ブルン地磁気逆転期とテクタイト衝撃形成期の年代比較","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"松山‐ブルン地磁気逆転期とテクタイト衝撃形成期の年代比較","subitem_title_language":"ja"}]},"item_type_id":"9","owner":"1","path":["2104"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2018-08-17"},"publish_date":"2018-08-17","publish_status":"0","recid":"26269","relation_version_is_last":true,"title":["松山‐ブルン地磁気逆転期とテクタイト衝撃形成期の年代比較"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-01-16T04:16:47.867468+00:00"}