{"@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/1360004234206833408.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1080/10420940.2013.877008"}},{"identifier":{"@type":"URI","@value":"http://www.tandfonline.com/doi/pdf/10.1080/10420940.2013.877008"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Utility of Geochemical Analysis of Trace Fossils: Case Studies Using<i>Phycosiphon incertum</i>from the Lower Jurassic Shallow-Marine (Higashinagano Formation, Southwest Japan) and Pliocene Deep-Marine Deposits (Shiramazu Formation, Central Japan)"}],"description":[{"notation":[{"@value":"Elemental and mineralogical analyses of Phycosiphon incertum from the Lower Jurassic Higashinagano Formation and Pliocene Shiramazu Formation revealed that the core and mantle have significantly different compositions; the Al2O3/SiO2 ratio, a general proxy for phyllosilicates to tectosilicates, showed a significantly (P < 0.01) higher value in the core than in the mantle. The obtained data strongly suggest that clay minerals are certainly concentrated in the core while coarse grains (i.e., quartz, feldspar) are enriched in the mantle. This is in agreement with the commonly believed interpretation of the Phycosiphon-producer; namely, it selectively ingested and excreted the clay-sized sediment grains and sorted out coarse grains. Difference in the degree of particle selection was also recognized; the tracemaker of the Higashinagano P. incertum showed greater degree of selectivity. This may be due to the differences in optimal foraging deposit-feeding activities affected by clay mineralogy of the host sedim..."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380004234206833410","@type":"Researcher","foaf:name":[{"@value":"Kentaro Izumi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"10420940"},{"@type":"EISSN","@value":"15635236"}],"prism:publicationName":[{"@value":"Ichnos"}],"dc:publisher":[{"@value":"Informa UK 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