{"@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/1360005518171904768.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/2018jb016209"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB016209"}},{"identifier":{"@type":"URI","@value":"http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1029%2F2018JB016209"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016209"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Relative Paleointensity and Inclination Anomaly Over the Last 8 Myr Obtained From the Integrated Ocean Drilling Program Site U1335 Sediments in the Eastern Equatorial Pacific"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>For understanding the fundamentals of the geodynamo such as the relation between paleointensity and polarity length and time‐averaged field (TAF) structure, continuous records of relative paleointensity (RPI) and inclination anomaly (Δ<jats:italic>I</jats:italic>) are desired; however, available records older than ~3 Ma are still very limited in time and space. We conducted a paleomagnetic study of the Integrated Ocean Drilling Program Site U1335 sediments in the eastern equatorial Pacific to obtain continuous RPI and Δ<jats:italic>I</jats:italic> records since ~8 Ma. Slow deposition, ~8.4 m/Myr or less, limits the resolution of the records but did allow for determination of long‐term variations. Rock‐magnetic measurements showed that biogenic magnetite dominates the magnetic mineral assemblages, and the proportion of biogenic to terrigenous magnetic minerals increases prior to ~4 Ma. The average paleointensity between ~4 and 8 Ma is approximately 30% lower than that from 0 to ~4 Ma. The apparent reduction of RPI at ~4 Ma reaches approximately ~50%, but ~20% of this is estimated to be artificial, induced by the increase in the proportion of biogenic magnetite. No relation between paleointensity and polarity length is recognized for the last ~8 Myr. The magnitude of Δ<jats:italic>I</jats:italic> is slightly larger during reversed polarity chrons (4.43° ± 1.47°) than normal polarity chrons (−0.69° ± 2.98°) over the last ~5 Myr, which agrees with the available TAF models of this time span. Prior to ~6 Ma, the sign of Δ<jats:italic>I</jats:italic> during the normal chrons might have switched to positive, and Δ<jats:italic>I</jats:italic> during reversed chrons might have been slightly larger than that after ~5 Ma.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380005518171904131","@type":"Researcher","foaf:name":[{"@value":"Toshitsugu Yamazaki"}],"jpcoar:affiliationName":[{"@value":"Atmosphere and Ocean Research Institute The University of Tokyo  Kashiwa Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380005518171904262","@type":"Researcher","foaf:name":[{"@value":"Yuhji Yamamoto"}],"jpcoar:affiliationName":[{"@value":"Center for Advanced Marine Core Research Kochi University  Nankoku Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"21699313"},{"@type":"EISSN","@value":"21699356"}],"prism:publicationName":[{"@value":"Journal of Geophysical Research: Solid Earth"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2018-09","prism:volume":"123","prism:number":"9","prism:startingPage":"7305","prism:endingPage":"7320"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2F2018JB016209"},{"@id":"http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1029%2F2018JB016209"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018JB016209"}],"createdAt":"2018-09-06","modifiedAt":"2023-09-10","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256810645248","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H05832"},{"@type":"JGN","@value":"JP15H05832"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PLANNED-15H05832/"}],"notation":[{"@language":"ja","@value":"核―マントルの地震・電磁気観測"},{"@language":"en","@value":"Seismic and geo-electromagnetic observations of core and mantle"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004233289796480","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"A detailed paleomagnetic record between 2.1 and 2.75 Ma at IODP Site U1314 in the North Atlantic: Geomagnetic excursions and the Gauss‐Matuyama transition"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004236002326912","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Paleoposition of the Intertropical Convergence Zone in the eastern Pacific inferred from glacial-interglacial changes in terrigenous and biogenic magnetic mineral fractions"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011145569647616","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Rock‐magnetic artifacts on long‐term relative paleointensity variations in 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