{"@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/1390282681490437504.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1186/bf03351766"}},{"identifier":{"@type":"NDL_BIB_ID","@value":"6633123"}},{"identifier":{"@type":"URI","@value":"http://id.ndl.go.jp/bib/6633123"}},{"identifier":{"@type":"URI","@value":"https://ndlsearch.ndl.go.jp/books/R000000004-I6633123"}},{"identifier":{"@type":"URI","@value":"https://dl.ndl.go.jp/pid/8842288"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/content/pdf/10.1186/BF03351766.pdf"}},{"identifier":{"@type":"URI","@value":"https://link.springer.com/article/10.1186/BF03351766/fulltext.html"}},{"identifier":{"@type":"URI","@value":"http://link.springer.com/content/pdf/10.1186/BF03351766"}},{"identifier":{"@type":"NAID","@value":"10011442826"}},{"identifier":{"@type":"NAID","@value":"130003780972"}}],"dc:title":[{"@language":"en","@value":"Rock-magnetic changes with reduction diagenesis in Japan Sea sediments and preservation of geomagnetic secular variation in inclination during the last 30, 000 years"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"A rock-magnetic and paleomagnetic study was conducted on a sediment core of about 4.4 m long taken from the northeastern part of the Japan Sea. The core covers the last about 30 kyrs, which was dated by nineteen radiocarbon (14C) ages. Remanent magnetization is carried dominantly by magnetite. Reductive dissolution of magnetic minerals occurs between 1.2 and 1.6 m in depth (about 5-8 ka in age). A rapid downcore decrease of anhysteretic remanent magnetization (ARM) begins at the shallowest depth. Saturation isothermal remanent magnetization (SIRM) follows, and a decrease of magnetic susceptibility (k) takes place at the deepest. Within this zone, coercivity of natural remanent magnetization (NRM) and the ratios of ARM to k and SIRM to k also decreases with depth. These observations indicate that finer magnetic grains were lost earlier than larger grains. A decrease of S ratios, wasp-waisted hysteresis curves, and a deviation from a mixing trend of single-domain and multi-domain grains in a Day plot occur as the dissolution proceeds, which suggests that high coercivity minerals like hematite are more resistive to dissolution than low coercivity minerals like magnetite. The start of the dissolution at 1.2 m in depth is synchronous with increases in organic-carbon and total-sulfur contents, but the horizon does not coincide with the present Fe-redox boundary at about 0.02 m below the sediment-water interface. From low-temperature magnetometry, it is estimated that magnetites with maghemite skin are reduced to pure magnetites prior to dissolution. There is no evidence for precipitation of secondary magnetic phases and acquisition of chemical remanent magnetization (CRM). Neither pyrrhotite nor greigite was detected. Information of paleomagnetic directions have survived the reductive dissolution. Inclination variations of this core resembles closely to the secular variation records available around Japan. Well-dated records older than 10 ka are still very rare, and hence our new record could be useful for establishing regional secular variations."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420282801190441984","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"80344125"},{"@type":"NRID","@value":"1000080344125"},{"@type":"NRID","@value":"9000021563633"},{"@type":"NRID","@value":"9000258406872"},{"@type":"NRID","@value":"9000258260138"},{"@type":"NRID","@value":"9000347136030"},{"@type":"NRID","@value":"9000253255626"},{"@type":"NRID","@value":"9000258415912"},{"@type":"NRID","@value":"9000258410891"},{"@type":"NRID","@value":"9000254529501"},{"@type":"NRID","@value":"9000253257592"},{"@type":"NRID","@value":"9000253255864"},{"@type":"NRID","@value":"9000018392919"},{"@type":"NRID","@value":"9000253257583"},{"@type":"NRID","@value":"9000007366076"},{"@type":"NRID","@value":"9000241784756"},{"@type":"NRID","@value":"9000254262705"},{"@type":"NRID","@value":"9000254740531"},{"@type":"NRID","@value":"9000252829935"},{"@type":"NRID","@value":"9000009463164"},{"@type":"NRID","@value":"9000018350479"},{"@type":"NRID","@value":"9000345439043"},{"@type":"NRID","@value":"9000403552046"},{"@type":"NRID","@value":"9000258259835"},{"@type":"NRID","@value":"9000264263525"},{"@type":"NRID","@value":"9000018752553"},{"@type":"NRID","@value":"9000004623401"},{"@type":"NRID","@value":"9000345426492"},{"@type":"NRID","@value":"9000001058153"},{"@type":"NRID","@value":"9000001990573"},{"@type":"NRID","@value":"9000338418960"},{"@type":"NRID","@value":"9000338418916"},{"@type":"NRID","@value":"9000021563083"},{"@type":"NRID","@value":"9000345439065"},{"@type":"NRID","@value":"9000000649404"},{"@type":"NRID","@value":"9000254586015"},{"@type":"NRID","@value":"9000347082797"},{"@type":"NRID","@value":"9000258410028"},{"@type":"NRID","@value":"9000254740133"},{"@type":"NRID","@value":"9000253256072"},{"@type":"NRID","@value":"9000256363984"},{"@type":"NRID","@value":"9000018582218"},{"@type":"NRID","@value":"9000018585021"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0005375"}],"foaf:name":[{"@language":"en","@value":"Yamazaki Toshitsugu"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Institute for Marine Resources and Environment, Geological Survey of Japan, AIST"}]},{"@id":"https://cir.nii.ac.jp/crid/1410282681490437506","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000254262706"},{"@type":"NRID","@value":"9000001058155"}],"foaf:name":[{"@language":"en","@value":"Abdeldayem Abdelaziz L."}],"jpcoar:affiliationName":[{"@language":"en","@value":"Faculty of Science, Tanta University"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326220392320","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"40356423"},{"@type":"NRID","@value":"1000040356423"},{"@type":"NDL_AUTHOR_ID","@value":"00884527"},{"@type":"NRID","@value":"9000021563626"},{"@type":"NRID","@value":"9000386336934"},{"@type":"NRID","@value":"9000254061942"},{"@type":"NRID","@value":"9000262362945"},{"@type":"NRID","@value":"9000391784965"},{"@type":"NRID","@value":"9000347136123"},{"@type":"NRID","@value":"9000018366682"},{"@type":"NRID","@value":"9000365017237"},{"@type":"NRID","@value":"9000002496683"},{"@type":"NRID","@value":"9000006909446"},{"@type":"NRID","@value":"9000370281520"},{"@type":"NRID","@value":"9000002479732"},{"@type":"NRID","@value":"9000386338342"},{"@type":"NRID","@value":"9000386336844"},{"@type":"NRID","@value":"9000241768267"},{"@type":"NRID","@value":"9000018706973"},{"@type":"NRID","@value":"9000391785294"},{"@type":"NRID","@value":"9000386336810"},{"@type":"NRID","@value":"9000254262707"},{"@type":"NRID","@value":"9000409996117"},{"@type":"NRID","@value":"9000018657099"},{"@type":"NRID","@value":"9000020575420"},{"@type":"NRID","@value":"9000245917819"},{"@type":"NRID","@value":"9000389942736"},{"@type":"NRID","@value":"9000403550595"},{"@type":"NRID","@value":"9000399571587"},{"@type":"NRID","@value":"9000009939105"},{"@type":"NRID","@value":"9000018350496"},{"@type":"NRID","@value":"9000386338335"},{"@type":"NRID","@value":"9000345426790"},{"@type":"NRID","@value":"9000399376861"},{"@type":"NRID","@value":"9000018862115"},{"@type":"NRID","@value":"9000019030045"},{"@type":"NRID","@value":"9000004617781"},{"@type":"NRID","@value":"9000316693026"},{"@type":"NRID","@value":"9000283115991"},{"@type":"NRID","@value":"9000018393723"},{"@type":"NRID","@value":"9000001058157"},{"@type":"NRID","@value":"9000014233943"},{"@type":"NRID","@value":"9000391785124"},{"@type":"NRID","@value":"9000014442973"},{"@type":"NRID","@value":"9000403551372"},{"@type":"NRID","@value":"9000258409947"},{"@type":"NRID","@value":"9000254585792"},{"@type":"NRID","@value":"9000389439277"},{"@type":"NRID","@value":"9000386338042"},{"@type":"NRID","@value":"9000403550288"},{"@type":"NRID","@value":"9000410949824"},{"@type":"NRID","@value":"9000240102741"},{"@type":"NRID","@value":"9000403550195"},{"@type":"NRID","@value":"9000009972636"},{"@type":"NRID","@value":"9000001086746"},{"@type":"NRID","@value":"9000237765739"},{"@type":"NRID","@value":"9000398150798"},{"@type":"NRID","@value":"9000016658940"},{"@type":"NRID","@value":"9000414373459"},{"@type":"NRID","@value":"9000386337059"},{"@type":"NRID","@value":"9000386337056"},{"@type":"NRID","@value":"9000386337032"},{"@type":"NRID","@value":"9000258408389"},{"@type":"NRID","@value":"9000241764500"},{"@type":"NRID","@value":"9000254585910"},{"@type":"NRID","@value":"9000414200628"},{"@type":"NRID","@value":"9000410949823"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/linkike00"}],"foaf:name":[{"@language":"en","@value":"Ikehara Ken"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Institute for Marine Resources and Environment, Geological Survey of Japan, AIST"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13438832"},{"@type":"EISSN","@value":"18805981"},{"@type":"NDL_BIB_ID","@value":"000000159136"},{"@type":"ISSN","@value":"13438832"},{"@type":"LISSN","@value":"13438832"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/13438832"},{"@type":"NCID","@value":"AA11211921"}],"prism:publicationName":[{"@language":"en","@value":"Earth, Planets and Space"},{"@language":"ja","@value":"Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ"},{"@language":"en","@value":"Earth Planets Space"},{"@language":"ja","@value":"Ｅａｒｔｈ　Ｐｌａｎｅｔｓ　Ｓｐａｃｅ"}],"dc:publisher":[{"@language":"en","@value":"Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences"},{"@language":"ja","@value":"地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会"}],"prism:publicationDate":"2003","prism:volume":"55","prism:number":"6","prism:startingPage":"327","prism:endingPage":"340"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"http://id.ndl.go.jp/bib/6633123"},{"@id":"https://ndlsearch.ndl.go.jp/books/R000000004-I6633123"},{"@id":"https://dl.ndl.go.jp/pid/8842288"},{"@id":"https://link.springer.com/content/pdf/10.1186/BF03351766.pdf"},{"@id":"https://link.springer.com/article/10.1186/BF03351766/fulltext.html"},{"@id":"http://link.springer.com/content/pdf/10.1186/BF03351766"}],"availableAt":"2003","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Rock%20magnetism","dc:title":"Rock magnetism"},{"@id":"https://cir.nii.ac.jp/all?q=reduction%20diagenesis","dc:title":"reduction diagenesis"},{"@id":"https://cir.nii.ac.jp/all?q=dissolution","dc:title":"dissolution"},{"@id":"https://cir.nii.ac.jp/all?q=secular%20variation","dc:title":"secular variation"},{"@id":"https://cir.nii.ac.jp/all?q=inclination","dc:title":"inclination"},{"@id":"https://cir.nii.ac.jp/all?q=Japan%20Sea","dc:title":"Japan Sea"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050570232449668096","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"A full sequence of the Matuyama–Brunhes geomagnetic reversal in the Chiba composite section, Central Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1360004229800814336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Low‐temperature magnetic properties of pelagic carbonates: Oxidation of biogenic magnetite and identification of magnetosome 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Theoretical curves and tests using titanomagnetite data"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574092892730112","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Hysteresis properties of titanomagnetites: Grain-size and compositional dependence"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574093488270976","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"The last two geomagnetic polarity reversals recorded in high-deposition-rate sediment drifts"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574096393959040","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Authigenic magnetite formation in suboxic marine sediments"}]},{"@id":"https://cir.nii.ac.jp/crid/1360584346467086208","@type":"Article","relationType":["cites"],"jpcoar:relatedTitle":[{"@value":"Magnetic properties of sediments deposited in suboxic-anoxic environments: relationships with biological and geochemical 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relative paleointensity and direction during the last 40,000 years obtained from a sediment core in the Nankai Trough"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137043899061120","@type":"Article","relationType":["references","cites"],"jpcoar:relatedTitle":[{"@value":"Rock magnetism of Late Neogene and Pleistocene deep‐sea sediments: Relationship to sediment source, diagenetic processes, and sediment lithology"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137044165811584","@type":"Article","relationType":["references","cites"],"jpcoar:relatedTitle":[{"@value":"Early diagenesis in North Atlantic abyssal plain sediments characterized by rock-magnetic and geochemical indices"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137045245285632","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Magnetite diagenesis in marine sediments from the Oregon continental 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systems"}]},{"@id":"https://cir.nii.ac.jp/crid/1361699994611800704","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Land‐ocean linkages over orbital and millennial timescales recorded in Late Quaternary sediments of the Japan Sea"}]},{"@id":"https://cir.nii.ac.jp/crid/1361699995055496320","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Gyroremanent magnetization and the magnetic properties of greigite-bearing clays in southern Sweden"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981468635043712","@type":"Article","relationType":["references","cites"],"jpcoar:relatedTitle":[{"@value":"Magnetostratigraphic results from impact crater Lake El'gygytgyn, northeastern Siberia: a 300 kyr long high-resolution terrestrial palaeoclimatic record from the Arctic"}]},{"@id":"https://cir.nii.ac.jp/crid/1361981470441989760","@type":"Article","relationType":["references","cites"],"jpcoar:relatedTitle":[{"@value":"The least-squares line 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