{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360004232425672704.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.pepi.2018.12.006"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S003192011830236X?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S003192011830236X?httpAccept=text/plain"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Low absolute paleointensity during Late Miocene Noma excursion of the Earth’s magnetic field"}],"description":[{"notation":[{"@value":"Abstract   Paleointensity variation is investigated for a sequence of andesitic lavas which records the Noma geomagnetic excursion at 6.66 ± 0.45 Ma. Sixty-six samples are collected from 11 lava flows at the Kamegaoka Mountain (31° 21′N, 130° 13′E) on the Noma Peninsula, Kyushu Island, Japan. Rock magnetic experiments confirm the presence of Ti-poor titanomagnetite grains with pseudo-single-domain or a mixture of single and multi-domains as the carrier of the remanent magnetization. The application of the Tsunakawa-Shaw method yields reliable geomagnetic paleointensity data set of 29 samples from 9 lavas that cover the Noma excursion. The mean paleointensities of lava flows vary from 1.9 to 10.3 µT. Paleointensity variation reveals a ‘V -shape’ of high–low–high paleointensities during the excursion. The highest value of 10.3 ± 3.5 µT appears prior to the excursion, the paleointensity decreases down to 1.9 ± 0.3 µT as the excursion progresses, and the paleointensity finally regenerates to 5.1 ± 3.0 µT at the end of the excursion. The virtual dipole moment (VDM) during the Noma excursion (0.3–1.1 × 1022 Am2) is less than 16% of the mean VDM during the period between 4 and 8 Ma in Miocene, suggesting that this weak geomagnetic field intensity is ascribed to the nature of excursions rather than the Miocene geomagnetic field properties. The weakest VDM (0.3 × 1022 Am2) in the Noma excursion is detected at the pole position that is located at fairly high latitude (58.9°N) in the opposite hemisphere. The Noma excursion is characterized by a large shift in virtual geomagnetic poles of more than 140° from the geographic pole and by a weak VDM of 1.0 × 1022 Am2 or less."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004232425672706","@type":"Researcher","foaf:name":[{"@value":"Kazuhiro Okayama"}]},{"@id":"https://cir.nii.ac.jp/crid/1420564276165152768","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"60422549"},{"@type":"NRID","@value":"1000060422549"},{"@type":"NRID","@value":"9000414227712"},{"@type":"NRID","@value":"9000001755178"},{"@type":"NRID","@value":"9000403551233"},{"@type":"NRID","@value":"9000399352013"},{"@type":"NRID","@value":"9000411272863"},{"@type":"NRID","@value":"9000264263726"},{"@type":"NRID","@value":"9000375915053"},{"@type":"NRID","@value":"9000411205346"},{"@type":"NRID","@value":"9000240185612"},{"@type":"NRID","@value":"9000396132308"},{"@type":"NRID","@value":"9000386336442"},{"@type":"NRID","@value":"9000414227723"},{"@type":"NRID","@value":"9000382634121"},{"@type":"NRID","@value":"9000239847703"},{"@type":"NRID","@value":"9000386284511"},{"@type":"NRID","@value":"9000245917897"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0069629"}],"foaf:name":[{"@value":"Nobutatsu Mochizuki"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232425672705","@type":"Researcher","foaf:name":[{"@value":"Yutaka Wada"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004232425672707","@type":"Researcher","foaf:name":[{"@value":"Yo-ichiro Otofuji"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00319201"}],"prism:publicationName":[{"@value":"Physics of the Earth and Planetary Interiors"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2019-02","prism:volume":"287","prism:startingPage":"10","prism:endingPage":"20"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S003192011830236X?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S003192011830236X?httpAccept=text/plain"}],"createdAt":"2018-12-26","modifiedAt":"2019-02-14","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781965811712","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17K05683"},{"@type":"JGN","@value":"JP17K05683"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K05683/"}],"notation":[{"@language":"ja","@value":"火山近傍テフラの残留磁化の基礎研究：磁化獲得過程と古地磁気記録としての信頼性"},{"@language":"en","@value":"A basic study on remanent magnetization of volcanic ash layer"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360011144187904768","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Palaeointensity study of the Oshima 1986 lava in Japan: implications for the reliability of the Thellier and LTD-DHT Shaw methods"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145452980224","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Further K-Ar dating and paleomagnetic study of the Auckland geomagnetic excursions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145921098496","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Inversion of titanomaghemites"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011146276262016","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Dynamics of the earth magnetic field in the 10–75 kyr period comprising the Laschamp and Mono Lake excursions: New results from the French Chaîne des Puys in a global perspective"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285709566317568","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Recognition of ‘cryptochron’ in the polarity subchron C3Ar: Palaeomagnetic results of the Late Miocene lava sequence from Noma Peninsula (Kyushu Island), Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620397528832","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Geomagnetic paleointensity deduced for the last 300 kyr from Unzen Volcano, Japan, and the dipolar nature of the Iceland Basin excursion"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292621555449856","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Paleointensity during a chron C26r excursion recorded in west Greenland lava flows"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092891194496","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Theory and application of the Day plot (<i>M</i><sub><i>rs</i></sub>/<i>M</i><sub><i>s</i></sub> versus <i>H</i><sub><i>cr</i></sub>/<i>H</i><sub><i>c</i></sub>) 1. 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