{"created":"2023-07-27T06:26:30.332557+00:00","id":10247,"links":{},"metadata":{"_buckets":{"deposit":"0905d5b7-c01e-427f-b0b9-562fd791453d"},"_deposit":{"created_by":3,"id":"10247","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"10247"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00010247","sets":["934:935:937"]},"author_link":["15333","14980"],"item_4_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2004-09-01","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"9","bibliographicPageEnd":"544","bibliographicPageStart":"536","bibliographicVolumeNumber":"110","bibliographic_titles":[{"bibliographic_title":"地質学雑誌"}]}]},"item_4_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"戸室火山の戸室山(安山岩の溶岩ドーム)で岩石磁気・古地磁気学的研究を行った.詳細な磁気測定により安山岩に含まれる磁性鉱物の種類,量,粒子サイズを推定した.マグネタイトとヘマタイトが残留磁化の担い手だが,溶岩ドーム内部の大部分をなす淡青灰色の安山岩(青戸室石)とドーム表層部をなす赤味を帯びた安山岩(赤戸室石)の間で両鉱物の量とマグネタイトの粒子サイズが異なる.赤戸室石では高温酸化によりマグネタイトの大部分がヘマタイトに変化し,それがマグネタイト量の減少と細粒化,及びヘマタイト量の増加をもたらした.戸室山では3地点で正帯磁の平均方位が決定されたが,それらは有意に異なっていた.溶岩ドームの表面では熱残留磁化の獲得後に溶岩の変形が起こった可能性が高い. We have investigated rock magnetic properties and remanent magnetization directions of samples collected from a lava dome of Tomuro Volcano, an andesitic mid-Pleistocene volcano located on the Japan Sea side of central Honshu. Detailed thermal demagnetization experiments and rock magnetic investigations including analyses of isothermal remanent magnetization and anhysteretic remanent magnetization specify the mineralogy, concentration, and grain size of magnetic minerals in andesite samples. Magnetite and hematite are identified as magnetic carriers. However, each mineral concentration differs between bluish andesite (so-called Ao-Tomuroishi) and reddish one (Aka-Tomuroishi) ; the latter contains more hematite and less magnetite than the former. Magnetic granulometry shows that magnetite in reddish andesite is finer than that in bluish one. At the Mt. Tomuro andesite dome, bluish andesite constitutes the majority of the dome whereas reddish andesite occurs as highly oxidized parts at the dome surface. Based on these observations, we conclude that in reddish andesite, high-temperature oxidation of magnetite grains caused their partial change to hematite and, as a result, reduced their effective grain sizes. Inconsistent site-mean directions were determined at three sites, although they all have northerly directions of normal polarity. This inconsistency would be explained by assuming deformation of lava at the dome surface below blocking temperatures of magnetite and hematite.","subitem_description_type":"Abstract"}]},"item_4_description_5":{"attribute_name":"提供者所属","attribute_value_mlt":[{"subitem_description":"金沢大学大学院自然科学研究科","subitem_description_type":"Other"}]},"item_4_publisher_17":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"日本地質学会"}]},"item_4_rights_23":{"attribute_name":"権利","attribute_value_mlt":[{"subitem_rights":"日本地質学会の許諾を得て登録"}]},"item_4_source_id_11":{"attribute_name":"NCID","attribute_value_mlt":[{"subitem_source_identifier":"AN00141768","subitem_source_identifier_type":"NCID"}]},"item_4_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0016-7630","subitem_source_identifier_type":"ISSN"}]},"item_4_version_type_25":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"石渡, 明"}],"nameIdentifiers":[{},{},{}]},{"creatorNames":[{"creatorName":"星, 博幸"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2017-10-03"}],"displaytype":"detail","filename":"AN00141768-ISHIWATARI-110.pdf","filesize":[{"value":"1.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"AN00141768-ISHIWATARI-110.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/10247/files/AN00141768-ISHIWATARI-110.pdf"},"version_id":"42f99ddb-8be1-49bf-a378-da14273f2fb9"}]},"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":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"石川県,戸室火山溶岩ドームの岩石磁気と古地磁気","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"石川県,戸室火山溶岩ドームの岩石磁気と古地磁気"},{"subitem_title":"Rock magnetism and paleomagnetism of a lava dome of Tomuro Volcano, Ishikawa Prefecture, Japan","subitem_title_language":"en"}]},"item_type_id":"4","owner":"3","path":["937"],"pubdate":{"attribute_name":"公開日","attribute_value":"2017-10-03"},"publish_date":"2017-10-03","publish_status":"0","recid":"10247","relation_version_is_last":true,"title":["石川県,戸室火山溶岩ドームの岩石磁気と古地磁気"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-07-28T01:42:31.961646+00:00"}