{"@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/1360565165890570880.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.gca.2013.01.045"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0016703713000781?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S0016703713000781?httpAccept=text/plain"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Contemporaneous formation of chondrules in distinct oxygen isotope reservoirs"}],"description":[{"notation":[{"@value":"We investigated the 26Al–26Mg systematics of type I (FeO-poor) chondrules from one of the most primitive carbonaceous chondrites, Acfer 094. The inferred initial 26Al/27Al ratios of chondrules from Acfer 094 ranged from (4.2 ± 2.0) × 10−6 to (9.0 ± 1.5) × 10−6. These chondrules have distinct oxygen isotope ratios (Δ17O: −5‰, −2‰, and 0‰), though no correlation between inferred initial 26Al/27Al ratios and oxygen isotope ratios were observed. These results indicate the regional oxygen isotope heterogeneity in the solar nebula over the duration of chondrule formation.    A few low-Ca pyroxene grains in chondrules have small but resolvable 26Mg excesses at the level of ∼0.1‰, which may be the result of a partial melting of chondrules by reheating events. If this is the case, the true inferred initial 26Al/27Al ratios of these particular chondrule could be slightly lower (<10%) than estimates using Mg isotope ratios of coexisting plagioclase and olivine.    Stable isotope ratios of Mg (25Mg/24Mg) of many olivine grains in chondrules are positively fractionated by ∼1‰ relative to those in other phases within the same chondrules. This suggests that olivine preserved a positively fractionated Mg isotope ratios of the chondrule-forming melt prior to significant condensation during the cooling stage of chondrule formation."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380847869038342657","@type":"Researcher","foaf:name":[{"@value":"Takayuki Ushikubo"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869038342660","@type":"Researcher","foaf:name":[{"@value":"Daisuke Nakashima"}]},{"@id":"https://cir.nii.ac.jp/crid/1420001326229056384","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20142226"},{"@type":"NRID","@value":"1000020142226"},{"@type":"NRID","@value":"9000002203822"},{"@type":"NRID","@value":"9000392140284"},{"@type":"NRID","@value":"9000007631486"},{"@type":"NRID","@value":"9000002250429"},{"@type":"NRID","@value":"9000258434787"},{"@type":"NRID","@value":"9000004619243"},{"@type":"NRID","@value":"9000025001631"},{"@type":"NRID","@value":"9000002250523"},{"@type":"NRID","@value":"9000005301811"},{"@type":"NRID","@value":"9000339174420"},{"@type":"NRID","@value":"9000002203330"},{"@type":"NRID","@value":"9000406037102"},{"@type":"NRID","@value":"9000002255447"},{"@type":"NRID","@value":"9000002204788"},{"@type":"NRID","@value":"9000006217004"},{"@type":"NRID","@value":"9000270176587"},{"@type":"NRID","@value":"9000406040018"},{"@type":"NRID","@value":"9000002250151"},{"@type":"NRID","@value":"9000002255540"},{"@type":"NRID","@value":"9000335567974"},{"@type":"NRID","@value":"9000370281580"},{"@type":"NRID","@value":"9000002250835"},{"@type":"NRID","@value":"9000335567904"},{"@type":"NRID","@value":"9000002255440"},{"@type":"NRID","@value":"9000002250365"},{"@type":"NRID","@value":"9000002250431"},{"@type":"NRID","@value":"9000339174496"},{"@type":"NRID","@value":"9000406037720"},{"@type":"NRID","@value":"9000258417829"},{"@type":"NRID","@value":"9000021529987"},{"@type":"NRID","@value":"9000018228469"},{"@type":"NRID","@value":"9000010715536"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0169673"}],"foaf:name":[{"@value":"Makoto Kimura"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869038342658","@type":"Researcher","foaf:name":[{"@value":"Travis J. Tenner"}]},{"@id":"https://cir.nii.ac.jp/crid/1380847869038342656","@type":"Researcher","foaf:name":[{"@value":"Noriko T. Kita"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00167037"}],"prism:publicationName":[{"@value":"Geochimica et Cosmochimica Acta"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2013-05","prism:volume":"109","prism:startingPage":"280","prism:endingPage":"295"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/","https://www.elsevier.com/legal/tdmrep-license"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S0016703713000781?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S0016703713000781?httpAccept=text/plain"}],"createdAt":"2013-02-13","modifiedAt":"2025-09-16","project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782120089216","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22540488"},{"@type":"JGN","@value":"JP22540488"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22540488/"}],"notation":[{"@language":"ja","@value":"コンドライト形成過程の復元に関する鉱物科学的研究"},{"@language":"en","@value":"Mineralogical study on the formation process of chondrites"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050583712586807040","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Radial transport and nebular thermal processing of millimeter-sized solids in the Solar protoplanetary disk inferred from Cr-Ti-O isotope systematics of chondrules"},{"@value":"Radial transport and nebular thermal processing of millimeter‐sized solids in the Solar protoplanetary disk inferred from Cr‐Ti‐O isotope systematics of chondrules"}]},{"@id":"https://cir.nii.ac.jp/crid/1050587981440014848","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Remnants of the early solar system water enriched in heavy oxygen isotopes"}]},{"@id":"https://cir.nii.ac.jp/crid/1360002215937127680","@type":"Article","resourceType":"学術雑誌論文(journal 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