{"created":"2023-06-20T14:52:30.375355+00:00","id":20661,"links":{},"metadata":{"_buckets":{"deposit":"05f895e2-6966-4aa9-a67f-f65dce5cccc4"},"_deposit":{"created_by":1,"id":"20661","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"20661"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00020661","sets":["1543:1778:1793","1887:1891"]},"author_link":["197005","197003","197001","197006","197002","197004"],"item_5_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"隕石球顆の年齢分布から推測される隕石球顆生成過熱イベントの歴史"}]},"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2003-11","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"48","bibliographicPageStart":"45","bibliographic_titles":[{"bibliographic_title":"第36回月・惑星シンポジウム"},{"bibliographic_title":"Proceedings of the 36th ISAS Lunar and Planetary Symposium","bibliographic_titleLang":"en"}]}]},"item_5_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"Chondrules are major components in primitive meteorites and consist of 70 percent by volume in ordinary chondrites. They are considered to be formed by a flash heating of dusts in the protoplanetary disk, though the nature of the heating mechanism is not yet well understood. In order to evaluate some basic factors in the heating mechanism of chondrule formation, examined were the rate of chondrule precursor heating and its time variation that explain the abundance and the observed age distribution of chondrules. The literature data of Al-26 ages of chondrules from the least equilibrated ordinary chondrites (LL3.0 to 3.1) was compiled, that range from 1 Myr to 3 Myr with a peak at about 1.8 Myr relative to the formation time of the oldest CAIs. Making a simple phenomenological model for chondrule formation, the total amount of heating, the fraction of reheated chondrules, and the evolution of the rate of chondrule precursor heating were evaluated. The model considers that the each event heated only a small fraction of existed dust material in the chondrule forming region at one time and numerous heating events produced a huge amount of chondrules. The result indicates that an average number of heating events experienced by a dust particle should be 1.2 times or higher and more than a half of the present chondrules were reheated. To explain observed chondrule age distributions, the chondrules formation started sometime between 0.6 to 1.3 Myr after the CAI formation and ended at 2.2 to 2.3 Myr. The rate of chondrule precursor heating has a peak at 0.3 to 0.6 Myr earlier than that of the observed age distribution of chondrules. The present calculation indicates that the starting time of the chondrule formation epoch is not zero. Thus, it is proposed that the heating events responsible for the chondrule formation could be different from that for CAI formation.","subitem_description_type":"Other"}]},"item_5_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0046650012","subitem_description_type":"Other"}]},"item_5_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙航空研究開発機構宇宙科学研究本部"}]},"item_5_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)"}]},"item_5_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"筑波大学 計算物理学研究センター"},{"subitem_text_value":"産業技術総合研究所 地質調査総合センター"},{"subitem_text_value":"東京大学 大学院理学系研究科"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"University of Tsukuba Center for Computational Physics"},{"subitem_text_language":"en","subitem_text_value":"National Institute of Advanced Industrial Science and Technology Geological Survey of Japan"},{"subitem_text_language":"en","subitem_text_value":"University of Tokyo Graduate School of Science"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"中本, 泰史"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"木多, 紀子"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"橘, 省吾"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Nakamoto, Taishi","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Kita, Noriko T.","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Tachibana, Shogo","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"隕石球顆生成","subitem_subject_scheme":"Other"},{"subitem_subject":"年齢分布","subitem_subject_scheme":"Other"},{"subitem_subject":"原始惑星表面","subitem_subject_scheme":"Other"},{"subitem_subject":"加熱","subitem_subject_scheme":"Other"},{"subitem_subject":"アバンダンス","subitem_subject_scheme":"Other"},{"subitem_subject":"塵","subitem_subject_scheme":"Other"},{"subitem_subject":"モデル","subitem_subject_scheme":"Other"},{"subitem_subject":"計算","subitem_subject_scheme":"Other"},{"subitem_subject":"chondrule formation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"age distribution","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"protoplanetary disk","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"heating","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"abundance","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"dust","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"model","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"computation","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":"conference paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"History of chondrule forming heating events inferred from chondrule age distribution","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"History of chondrule forming heating events inferred from chondrule age distribution","subitem_title_language":"en"}]},"item_type_id":"5","owner":"1","path":["1793","1891"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"20661","relation_version_is_last":true,"title":["History of chondrule forming heating events inferred from chondrule age distribution"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T03:47:04.625754+00:00"}