{"@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/1363670320231630208.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/0016-7037(53)90014-3"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:0016703753900143?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:0016703753900143?httpAccept=text/plain"}},{"identifier":{"@type":"NAID","@value":"30007701532"}}],"dc:title":[{"@value":"Calcium-poor garnet in relation to metamorphism"}],"description":[{"notation":[{"@value":"Abstract     1.   (1) The writer has carried out a systematic study of pyralspites (calcium-poor garnets) in pelitic metamorphic rocks of the Gosaisyo-Takanuki district. With the increase in metamorphic grade of their host-rocks, the MnO content of the pyralspites decreases, while the FeO content increases. Accompanying the variations in composition, the edge length of the unit cell of the minerals shortens and the refractive index becomes generally higher. The associated biotite also varies in composition and proportion with advancing metamorphism.   2.   (2) The MnO content of pyralspites in ordinary politic metamorphic rocks generally decreases with the increase in metamorphic grade. When we use main mineral facies as a scale of metamorphic grade, however, the MnO contents of pyralspites in ordinary politic metamorphic rocks of the same mineral facies differ in different districts, owing to the difference in character of metamorphism in different districts. Thus, the MnO contents of pyralspites in ordinary pelitic metamorphic rocks are a useful indicator of the character of metamorphism (Fig. 5).   3.   (3) When we treat pyralspites not only from ordinary pelitic metamorphic rooks, but also from rocks of a much wider range of composition, the minerals show a progressive enlargement of their composition field from Mn-rich compositions to Fe-rich ones, and further to Mg-rich ones, with advancing metamorphism, instead of the above-mentioned gradual decrease in MnO content (Fig. 7).   4.   (4) The progressive enlargement of the composition field in pyralspite with advancing metamorphism can be explained in terms of crystal chemistry. Mn +2  ions are the most appropriate in size to enter the crystal structure of pyralspite, and so only pyralspite rich in Mn +2  can be formed at very low temperatures. With the increase in the temperature of its formation, ions whose ionic radii are less appropriate to the crystal, such as Fe +2  and further Mg +2 , become increasingly free to enter the crystal, and so the composition field of pyralspite becomes progressively larger with advancing metamorphism of the host-rocks.     Such cryatallo-chemical properties of pyralspite reveal themselves also in the distribution of Mn +2 , Fe +2 , and Mg +2  in pyralspites and associated ferromagnesian minerals."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383670320231630208","@type":"Researcher","foaf:name":[{"@value":"Akiho Miyashiro"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00167037"}],"prism:publicationName":[{"@value":"Geochimica et Cosmochimica Acta"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"1953-10","prism:volume":"4","prism:number":"4","prism:startingPage":"179","prism:endingPage":"208"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:0016703753900143?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:0016703753900143?httpAccept=text/plain"}],"createdAt":"2003-08-06","modifiedAt":"2023-04-26","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360848657386429824","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Petrology and geochemistry of mafic rocks in the Acasta Gneiss Complex: Implications for the oldest mafic rocks and their origin"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001205219729664","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Heavy mineral composition of the Neogene sandstones and beach sands across the Inani-Dakhin Nhila area, Southeast Bangladesh: Implications for provenance"},{"@language":"ja","@value":"南東バングラデシュ，イナニおよびダキンニーラ丘陵地域の新第三系砂岩と完新統海浜砂の重鉱物組成 : 後背地検討への適用"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206234980608","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"The stone materials of the Angkor monuments, Cambodia. The magnetic susceptibility and the orientation of the bedding plane of the sandstone."},{"@language":"ja","@value":"アンコール遺跡（カンボジア）の石材"},{"@value":"The stone materials of the Angkor monuments, Cambodia—The magnetic susceptibility and the orientation of the bedding plane of the sandstone"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206238498304","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Provenance of detrital garnets from the Yukawa Formation, Yanase district, Shimanto belt, Kii Peninsula, Southwest Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679243648768","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"飯豊山地のざくろ石黒雲母白雲母花崗岩"},{"@language":"en","@value":"Garnet-biotite-muscovite granite in the Iide Mountains"},{"@language":"ja-Kana","@value":"イイデ サンチ ノ ザクロイシ クロウンモ シロウンモ カコウガン"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282680086091520","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Garnets from Fujikaramari, Abukuma Plateau, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681210182784","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Exotic slices derived from the Hidaka metamorphic belt in the Poroshiri ophiolite, Hokkaido, Japan."},{"@language":"ja","@value":"ポロシリオフィオライト中にトラップされた日高変成帯起源の異地性岩塊"},{"@value":"Exotic slices derived from the Hidaka metamorphic belt in the Poroshiri ophiolite, Hokkaido"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681210281856","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Origin of detrital garnet, chromian spinel and chloritoid from the Lower Jurassic Shizugawa Group in the South Kitakami 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