{"@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/1360004229807577344.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1002/2017gc007127"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017GC007127"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GC007127"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Changing Abundance of Magnetofossil Morphologies in Pelagic Red Clay Around Minamitorishima, Western North Pacific"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>Recent investigations have discovered an unexpected abundance of magnetofossils in oxic pelagic red clays. These have potential to serve as paleoenvironmental tracers in otherwise nonfossiliferous sediments. Here, we report on variations in the abundance and morphology of magnetofossils in red clay from the western North Pacific. Magnetic measurements revealed that magnetofossils dominate the magnetic mineral assemblage of the sediments. An endmember analysis of isothermal remanent magnetization acquisition curves, supplemented by an analysis of S ratios, indicates that the magnetic assemblage can be unmixed into three endmembers, two corresponding to magnetofossils and one to terrigenous magnetic minerals. Direct counting of magnetofossil morphologies under a transmission electron microscope shows that the two magnetofossil endmembers differentiate equant magnetofossils and bullet‐shaped magnetofossils, respectively. The stratigraphic variation of the endmember contributions revealed that the equant magnetofossils are dominant for the most part, while an interval at around 7 m in core depth shows higher abundance of the bullet‐shaped magnetofossils. This may reflect enhanced organic carbon flux to the sediments. The organic carbon content is low throughout the sediments, and it does not show any change corresponding to the increase of bullet‐shaped magnetofossils, pointing at extensive remineralization of the organic carbon. On the basis of lithostratigraphic correlation to nearby drilling sites, we tentatively estimate the age of the bullet‐shaped magnetofossil increase as sometime between ∼75 and 25 Ma. These results suggest that environmental information can be obtained from magnetofossils in pelagic red clay.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276183173632","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20609862"},{"@type":"NRID","@value":"1000020609862"},{"@type":"NRID","@value":"9000347083667"},{"@type":"NRID","@value":"9000376926620"},{"@type":"NRID","@value":"9000347136032"},{"@type":"NRID","@value":"9000264268454"},{"@type":"NRID","@value":"9000386337364"},{"@type":"NRID","@value":"9000386337409"},{"@type":"NRID","@value":"9000345439041"},{"@type":"NRID","@value":"9000018698871"},{"@type":"NRID","@value":"9000350560356"},{"@type":"NRID","@value":"9000412001502"},{"@type":"NRID","@value":"9000370280775"},{"@type":"NRID","@value":"9000338418958"},{"@type":"NRID","@value":"9000258418198"},{"@type":"NRID","@value":"9000338418914"},{"@type":"NRID","@value":"9000239847704"},{"@type":"NRID","@value":"9000350560373"},{"@type":"NRID","@value":"9000345439063"},{"@type":"NRID","@value":"9000347167287"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/yoichiusui"}],"foaf:name":[{"@value":"Yoichi Usui"}],"jpcoar:affiliationName":[{"@value":"Department of Deep Earth Structure and Dynamics Research Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) Yokosuka Kanagawa Japan"},{"@value":"Research and Development Center for Submarine Resources, JAMSTEC Yokosuka Kanagawa Japan"},{"@value":"Project Team for Development of New‐generation Research Protocol for Submarine Resources, JAMSTEC Yokosuka Kanagawa 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Yamazaki"}],"jpcoar:affiliationName":[{"@value":"Research and Development Center for Submarine Resources, JAMSTEC Yokosuka Kanagawa Japan"},{"@value":"Project Team for Development of New‐generation Research Protocol for Submarine Resources, JAMSTEC Yokosuka Kanagawa Japan"},{"@value":"Atmosphere and Ocean Research Institute (AORI) University of Tokyo Kashiwa Chiba Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380004229807577094","@type":"Researcher","foaf:name":[{"@value":"Masafumi Saitoh"}],"jpcoar:affiliationName":[{"@value":"Research and Development Center for Submarine Resources, JAMSTEC Yokosuka Kanagawa Japan"},{"@value":"Project Team for Development of New‐generation Research Protocol for Submarine Resources, JAMSTEC Yokosuka Kanagawa Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"15252027"},{"@type":"EISSN","@value":"15252027"}],"prism:publicationName":[{"@value":"Geochemistry, Geophysics, Geosystems"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"2017-12","prism:volume":"18","prism:number":"12","prism:startingPage":"4558","prism:endingPage":"4572"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017GC007127"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GC007127"}],"createdAt":"2017-12-09","modifiedAt":"2023-09-26","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000781829301888","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"15H03740"},{"@type":"JGN","@value":"JP15H03740"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15H03740/"}],"notation":[{"@language":"ja","@value":"炭酸塩からよむ古海洋の硝酸：N同位体比の復元"}]},{"@id":"https://cir.nii.ac.jp/crid/1040000781958271104","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"17H04855"},{"@type":"JGN","@value":"JP17H04855"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17H04855/"}],"notation":[{"@language":"ja","@value":"核の熱史解明を目指したナノ磁鉄鉱の三次元配列精密測定に基づく古地球磁場強度復元"},{"@language":"en","@value":"Characterizing 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States"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107369670918656","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Organic carbon flux controls the morphology of magnetofossils in marine sediments"}]},{"@id":"https://cir.nii.ac.jp/crid/1363107370733763456","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Ocean overturning since the Late Cretaceous: Inferences from a new benthic foraminiferal isotope compilation"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388843825492224","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Impact of depositional and biogeochemical processes on small scale variations in nodule abundance in the Clarion‐Clipperton Fracture Zone"}]},{"@id":"https://cir.nii.ac.jp/crid/1363388845040776704","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Paleoenvironmental implications of rock‐magnetic properties of Late Quaternary sediment cores 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