{"@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/1360567182088682496.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.epsl.2012.06.002"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X12002865?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0012821X12002865?httpAccept=text/plain"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"U–Pb isotopic systematics of shock-loaded and annealed baddeleyite: Implications for crystallization ages of Martian meteorite shergottites"}],"description":[{"notation":[{"@value":"Abstract   Shock-recovery and annealing experiments on basalt-baddeleyite mixtures were undertaken to evaluate shock effects on U–Pb isotopic systematics of baddeleyite. Shock pressures up to 57 GPa caused fracturing of constituent phases, mosaicism of olivine, maskelynitization of plagioclase, and melting, but the phase transition from monoclinic baddeleyite structure to high-pressure/temperature polymorphs of ZrO2 was not confirmed. The U–Pb isotopic systems of the shock-loaded baddeleyite did not show a large-scale isotopic disturbance. The samples shock-recovered from 47 GPa were then employed for annealing experiments at 1000 or 1300 °C, indicating that the basalt-baddeleyite mixture was almost totally melted except olivine and baddeleyite. Fine-grained euhedral zircon crystallized from the melt was observed around the relict baddeleyite in the sample annealed at 1300 °C for 1 h. The U–Pb isotopic systems of baddeleyite showed isotopic disturbances: many data points for the samples annealed at 1000 °C plotted above the concordia. Both radiogenic lead loss/uranium gain and radiogenic lead gain/uranium loss were observed in the baddeleyite annealed at 1300 °C. Complete radiogenic lead loss due to shock metamorphism and subsequent annealing was not observed in the shock-loaded/annealed baddeleyites studied here. These results confirm that the U–Pb isotopic systematics of baddeleyite are durable for shock metamorphism. Since shergottites still preserve Fe–Mg and/or Ca zonings in major constituent phases (i.e. pyroxene and olivine), the shock effects observed in Martian baddeleyites seem to be less intense compared to that under the present experimental conditions. An implication is that the U–Pb systems of baddeleyite in shergottites will provide crystallization ages of Martian magmatic rocks."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276183266176","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20733679"},{"@type":"NRID","@value":"1000020733679"},{"@type":"NRID","@value":"9000002017592"},{"@type":"NRID","@value":"9000258407983"},{"@type":"NRID","@value":"9000010332670"},{"@type":"NRID","@value":"9000408855978"},{"@type":"NRID","@value":"9000408855880"},{"@type":"NRID","@value":"9000258406541"},{"@type":"NRID","@value":"9000018626700"},{"@type":"NRID","@value":"9000399352150"},{"@type":"NRID","@value":"9000258406718"},{"@type":"NRID","@value":"9000410038016"},{"@type":"NRID","@value":"9000017443625"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/20733679"}],"foaf:name":[{"@value":"Takafumi 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Misawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1380567182088682497","@type":"Researcher","foaf:name":[{"@value":"Toshimori Sekine"}]},{"@id":"https://cir.nii.ac.jp/crid/1380567182088682498","@type":"Researcher","foaf:name":[{"@value":"Takashi Mikouchi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0012821X"}],"prism:publicationName":[{"@value":"Earth and Planetary Science Letters"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2012-08","prism:volume":"341-344","prism:startingPage":"195","prism:endingPage":"210"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0012821X12002865?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0012821X12002865?httpAccept=text/plain"}],"createdAt":"2012-07-13","modifiedAt":"2024-04-26","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782109958528","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22340167"},{"@type":"JGN","@value":"JP22340167"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340167/"}],"notation":[{"@language":"ja","@value":"火星隕石シャーゴッタイトの同位体年代学研究"},{"@language":"en","@value":"Chronological study of martian meteorites, shergottites"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232342523520","@type":"Article","resourceType":"学術雑誌論文(journal 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