{"@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/1362825896153846912.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2138/am.2009.3080"}}],"dc:title":[{"@value":"Dmitryivanovite: A new high-pressure calcium aluminum oxide from the Northwest Africa 470 CH3 chondrite characterized using electron backscatter diffraction analysis"}],"description":[{"notation":[{"@value":"Dmitryivanovite (CaAl 2 O 4 ) is a newly described, calcium aluminum oxide from the Northwest Africa 470 (NWA470) CH3 chondrite (Ivanova et al. 2002). NWA470 contains abundant small Ca,Al-rich inclusions (CAIs), and dmitryivanovite, whose composition is close to stoichiometric CaAl 2 O 4  [Ca 1.000 (Al 1.993 Si 0.003 Ti 0.002 ) 1.998 O 4 ], was found in one of these CAIs. It occurs as ~10 μm subhedral grains intergrown with grossite (CaAl 4 O 7 ), perovskite, and melilite. Electron backscatter diffraction (EBSD) analysis revealed that dmitryivanovite is a high-pressure polymorph of CaAl 2 O 4  ( a  = 7.95,  b  = 8.62,  c  = 10.25 A, β = 93.1°, space group  P 2 1 / c , and  Z  = 12). Dmitryivanovite is the third phase to be described from nature in the binary system of CaO–Al 2 O 3 , the other two being hibonite (CaAl 12 O 19 ) and grossite (CaAl 4 O 7 )—all are found in CAIs. The presence of CaAl 2 O 4  in NWA470 suggests a local elevated dust/gas ratio in the solar nebula. The phase diagram of CaAl 2 O 4  shows that ~2 GPa is required to stabilize the high-pressure CaAl 2 O 4  polymorph at 1327 °C, above which CaAl 2 O 4  condenses from the solar nebula. Because it is unlikely that the solar nebula ever had such a high total gas pressure, it appears more probable that condensation of the low-pressure polymorph occurred in the solar nebula with an enhanced dust-to-gas ratio and that subsequently the high-pressure polymorph was produced by shock metamorphism, most likely after the CaAl 2 O 4 -bearing CAI was incorporated into the NWA470 parent asteroid."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382825896153846913","@type":"Researcher","foaf:name":[{"@value":"T. Mikouchi"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846916","@type":"Researcher","foaf:name":[{"@value":"M. Zolensky"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846914","@type":"Researcher","foaf:name":[{"@value":"M. Ivanova"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846915","@type":"Researcher","foaf:name":[{"@value":"O. Tachikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846912","@type":"Researcher","foaf:name":[{"@value":"M. Komatsu"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846918","@type":"Researcher","foaf:name":[{"@value":"L. Le"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825896153846917","@type":"Researcher","foaf:name":[{"@value":"M. Gounelle"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"0003004X"}],"prism:publicationName":[{"@value":"American Mineralogist"}],"dc:publisher":[{"@value":"Mineralogical Society of America"}],"prism:publicationDate":"2009-05-01","prism:volume":"94","prism:number":"5-6","prism:startingPage":"746","prism:endingPage":"750"},"reviewed":"false","createdAt":"2009-05-12","modifiedAt":"2021-03-04","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360002217131060608","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Coesite and stishovite in a shocked lunar meteorite, Asuka-881757, and impact events in lunar surface"}]},{"@id":"https://cir.nii.ac.jp/crid/1360567185713955968","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Ca‐Al‐Fe‐rich inclusion in the Vigarano CV3 chondrite"}]},{"@id":"https://cir.nii.ac.jp/crid/1390010457712912768","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Elucidating evolution processes of Solar System bodies: Approaches by mineralogical study of various kinds of extraterrestrial materials"},{"@language":"ja","@value":"太陽系での天体進化プロセスの解明を目指して：多様な地球外物質の鉱物学的研究によるアプローチ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681502781440","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Introduction to Meteorite Mineralogy"},{"@language":"ja","@value":"隕石中の鉱物：序説"},{"@value":"日本鉱物科学会賞第11回受賞者 受賞記念研究紹介 隕石中の鉱物 : 序説"},{"@language":"ja-Kana","@value":"ニホン コウブツ カガクカイショウ ダイ11カイ ジュショウシャ ジュショウ キネン ケンキュウ ショウカイ インセキ チュウ ノ コウブツ : ジョセツ"}]},{"@id":"https://cir.nii.ac.jp/crid/2050025942153536512","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Natural and experimental high-pressure, shock-produced terrestrial and extraterrestrial materials"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.2138/am.2009.3080"},{"@type":"OPENAIRE","@value":"doi_dedup___::d44c890ca5ad098bf1e079861099f4df"},{"@type":"CROSSREF","@value":"10.1073/pnas.1009338108_references_DOI_3eIJmFK6P8zT9MtJPXPsb1vXxGr"},{"@type":"CROSSREF","@value":"10.2465/gkk.141210_references_DOI_3eIJmFK6P8zT9MtJPXPsb1vXxGr"},{"@type":"CROSSREF","@value":"10.2465/gkk.220214_references_DOI_3eIJmFK6P8zT9MtJPXPsb1vXxGr"},{"@type":"CROSSREF","@value":"10.1111/j.1945-5100.2011.01183.x_references_DOI_3eIJmFK6P8zT9MtJPXPsb1vXxGr"},{"@type":"CROSSREF","@value":"10.1186/s40645-021-00451-6_references_DOI_3eIJmFK6P8zT9MtJPXPsb1vXxGr"}]}