{"created":"2021-03-01T06:51:30.409568+00:00","id":32796,"links":{},"metadata":{"_buckets":{"deposit":"ef04b00b-3c40-41ed-87e5-43e841e8f4f8"},"_deposit":{"id":"32796","owner":"1","owners":[],"pid":{"revision_id":0,"type":"depid","value":"32796"},"status":"published"},"_oai":{"id":"oai:repository.dl.itc.u-tokyo.ac.jp:00032796","sets":["80:4535:4737:4743","9:504:4538:4739:4744"]},"author_link":["127606","127605"],"item_4_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"DELP1987年度小笠原海域航海報告 : I : 概説"}]},"item_4_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1989-09-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"131","bibliographicPageStart":"119","bibliographicVolumeNumber":"64","bibliographic_titles":[{"bibliographic_title":"東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo"}]}]},"item_4_description_13":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_4_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Late in the fall of 1987, as a part of the Japanese National Research Program (DELP/Dynamics and Evolution of the Lithosphere Program : Japanese title of ILP) a geophysical and geological research cruise (DELP-87 cruise by two vessels) was carried out in the western margin of the Pacific and the Ogasawara (Bonin) Trough area, one of the back-arc basins in the western part of the Pacific. It is suggested through the present and past studies that the trough has been formed as a result of differential rifting and subsequent opening of the Parece Vela and Shikoku Basins in the middle Tertiary. The crustal structure of the trough is basically similar to those of other part of the Izu-Ogasawara system but it represents a consequence of tectonic stretching. Therefore, the horizontal stress field of the trough area between ca. 50 and 20 Ma may have been extensional. A conspicuous feature of the world's highest gravity anomaly associated with the existence of a large Boninite mass around the Ogasawara Ridge in the eastern part of the trough must be supported by some dynamic uplifting force if not a compressive horizontal stress field.","subitem_description_type":"Abstract"},{"subitem_description":"1987年の秋にDELP研究・調査の一環として本研究グループは小笠原海盆の地学的探査及び海底からの試料の採取を実行した.この海域は小笠原諸島と七島硫黄島火山列の間に挟まれた深い(3500-4200m)海盆を形成し,またこの海域の東側には太平洋全域でも最も年代の古い海洋底プレートが在り,この海域のプレートの下側に潜り込んでいる.また太平洋プレートによって東方から運ばれてきた海山列が小笠原(前弧)諸島に衝突しているためか,或はパレスベラ海盆と四国海盆の間の非同期的海洋底拡大作用の結果として,この海域全般には錯綜したテクトニクス的作用力が働いたと推定され,地史は第三紀以降だけでも複雑である.調査は,エアガンによる多重式反射法地殻構造音波探査,ダイナマイト及びエアガンを音源とし,海底地震計を受波装置とする屈折法地震構造探査,地磁気異常分布探査,海底地殻熱流量探査,ドレッジおよびコアラー等の項目について行われた.これらの探査結果は,今日までに得られている他の探査結果等と融合あるいは比較検討の結果,この地域におけるテクトニクス的古環境に関する基礎的なデータを提供するはずであるが,探査結果の詳細な解析は,更に日時を要し本稿の作製時の現在においても,参加各研究機関において続けられており,ここに掲載された内容については,近い将来にも改訂される可能性があることをお断りしておきたい.また研究・調査航海に際しては,日本サルベージ株式会社所属の若潮丸および東海大学所属の東海大学丸二世号の両船舶並びに関係諸氏にはひとかたならざるお世話になった,この紙面を借りて謝意を表したい.","subitem_description_type":"Abstract"}]},"item_4_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"127606","nameIdentifierScheme":"WEKO"}],"names":[{"name":"DELP背弧海盆研究班"}]}]},"item_4_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.15083/0000032796","subitem_identifier_reg_type":"JaLC"}]},"item_4_publisher_20":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"東京大学地震研究所"}]},"item_4_source_id_10":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00162258","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_8":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"00408972","subitem_source_identifier_type":"ISSN"}]},"item_4_subject_15":{"attribute_name":"日本十進分類法","attribute_value_mlt":[{"subitem_subject":"453","subitem_subject_scheme":"NDC"}]},"item_4_text_21":{"attribute_name":"出版者別名","attribute_value_mlt":[{"subitem_text_value":"Earthquake Research Institute, University of Tokyo"}]},"item_4_text_4":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"地震研究所"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Japanese Delp Research Group on Back-Arc Basins"}],"nameIdentifiers":[{"nameIdentifier":"127605","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":"2017-06-26"}],"displaytype":"detail","filename":"ji0642001.pdf","filesize":[{"value":"1.4 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"ji0642001.pdf","url":"https://repository.dl.itc.u-tokyo.ac.jp/record/32796/files/ji0642001.pdf"},"version_id":"4001ec24-beae-483f-b307-17c001f7453c"}]},"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":"Report on DELP 1987 Cruises in the Ogasawara Area : Part I : General Outline","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Report on DELP 1987 Cruises in the Ogasawara Area : Part I : General Outline","subitem_title_language":"en"}]},"item_type_id":"4","owner":"1","path":["4743","4744"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2008-05-30"},"publish_date":"2008-05-30","publish_status":"0","recid":"32796","relation_version_is_last":true,"title":["Report on DELP 1987 Cruises in the Ogasawara Area : Part I : General Outline"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2022-12-19T04:08:44.507759+00:00"}