{"created":"2023-07-25T11:00:54.353534+00:00","id":2823,"links":{},"metadata":{"_buckets":{"deposit":"5052ccca-17d4-4a2e-98a8-087935164575"},"_deposit":{"created_by":4,"id":"2823","owners":[4],"pid":{"revision_id":0,"type":"depid","value":"2823"},"status":"published"},"_oai":{"id":"oai:nipr.repo.nii.ac.jp:00002823","sets":["1259:1260:1265:414:423"]},"author_link":["3461","3463","3462","3458","3460","3459"],"item_1_biblio_info_14":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1996-09","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"64","bibliographicPageStart":"49","bibliographicVolumeNumber":"9","bibliographic_titles":[{"bibliographic_title":"Proceedings of the NIPR Symposium on Antarctic Geosciences"}]}]},"item_1_creator_7":{"attribute_name":"著者名よみ","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"アサミ, マサオ"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"スズキ, カズヒロ"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"アダチ, マモル"}],"nameIdentifiers":[{}]}]},"item_1_creator_8":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"ASAMI, Masao","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"SUZUKI, Kazuhiro","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"ADACHI, Mamoru","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":"Chemical Th-U-total Pb isochron (CHIME) ages were determined with an electron microprobe analyzer on 14 to 24 monazite grains in three garnet-biotite gneisses collected from separate outcrops in the eastern part of the Sør Rondane Mountains, East Antarctica. On the basis of geologic and petrologic studies, investigators have inferred a two-stage metamorphic history for the Sør Rondane : (1) an earlier regional granulite-facies event inferred from U-Pb zircon and Rb-Sr and Sm-Nd whole rock data to be ∿1000Ma in age, and (2) an amphibolite-facies overprint inferred to be ∿500Ma in age. PbO-ThO_2^* plots based on ThO_2,UO_2 and PbO contents of monazites yield a well-defined isochron for each gneiss, although both matrix grains in all gneiss samples and inclusions in garnet and pyrrhotite grains in a sample were analyzed. The isochrons give 536,534 and 534 Ma ages, indicating a single crystallization age (~535Ma) for the monazites. This age is in good agreement with the ~500Ma age currently assigned to the amphibolite-facies overprint. However, the high Pb retentivity reported for monazite, along with textural and mineralogical characteristics of the samples, constrains assignment of the monazite age to the granulite-facies metamorphism rather than to retrograde recrystallization. Our ~535Ma ages give rise to a possibility of further westward extension of a Cambrian orogenic belt recently reported from the Lützow-Holm and Yamato-Belgica Complexes, where a similar succession of metamorphic and plutonic activities has been recognized.","subitem_description_type":"Other"}]},"item_1_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15094/00002823","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":"AA1072335X","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 Sciences, Faculty of Science, Okayama University"},{"subitem_text_language":"en","subitem_text_value":"Department of Earth and Planetary Sciences, School of Science, Nagoya University"},{"subitem_text_language":"en","subitem_text_value":"Department of Earth and Planetary Sciences, School of Science, Nagoya University"}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"1996-09-01"}],"displaytype":"detail","filename":"KJ00002409870.pdf","filesize":[{"value":"1.4 MB"}],"format":"application/pdf","licensetype":"license_6","mimetype":"application/pdf","url":{"label":"KJ00002409870","url":"https://nipr.repo.nii.ac.jp/record/2823/files/KJ00002409870.pdf"},"version_id":"73a485e7-de6d-4a6e-8132-0d14481c9ad4"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"CHIME age","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"monazite","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Cambrian","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"granulite facies","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Sør Rondane Mountains","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"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":"MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA"}]},"item_type_id":"1","owner":"4","path":["423"],"pubdate":{"attribute_name":"公開日","attribute_value":"1996-09-01"},"publish_date":"1996-09-01","publish_status":"0","recid":"2823","relation_version_is_last":true,"title":["MONAZITE AGES BY THE CHEMICAL Th-U-TOTAL Pb ISOCHRON METHOD FOR PELITIC GNEISSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA"],"weko_creator_id":"4","weko_shared_id":4},"updated":"2023-07-25T12:41:58.741409+00:00"}