{"@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/1360021390571939456.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/petrology/egae018"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/petrology/advance-article-pdf/doi/10.1093/petrology/egae018/56798554/egae018.pdf"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/petrology/article-pdf/65/4/egae018/57136762/egae018.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Genesis of Andesitic Magma Erupted at Yufu Volcano, Kyushu Island, Southwest Japan Arc: Evidence from the Chemical Compositions of Amphibole Phenocrysts"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>The major- and trace-element compositions of amphiboles in andesite from Quaternary Yufu Volcano, northeastern Kyushu, Japan were analysed to investigate the generation processes of andesitic magma from Yufu Volcano. The amphiboles in andesite from Yufu volcano can be divided into two groups based on major-element composition: pargasite and magnesio-hornblende. To estimate temperature, pressure, and major- and trace-element compositions of melts in equilibrium with amphiboles, we used the recently proposed methods that can calculate temperature, pressure, major element compositions, and partition coefficients of trace-element between amphibole and melt using only the major-element compositions of amphibole. The estimated temperature, pressure, and major-element composition of melt in equilibrium with the amphibole phenocrysts indicate that each group crystallised under different conditions. These differences suggest that two magma chambers at different depths existed beneath Yufu Volcano and that the andesitic magma of Yufu Volcano was formed by mixing of the two magmas. The trace-element compositions of melts in equilibrium with the pargasite and magnesio-hornblende, estimated by applying the partition coefficients calculated from major-element compositions of amphibole to trace-element compositions of amphiboles, indicate magma derived from slab melt and the partial melting of crustal material, respectively. Because magma is a mixture of minerals and melt, we estimate the chemical compositional ranges of the two end-member magmas on the Y versus SiO2 diagram from the mixing relationship between amphibole and estimated melt, as well as phenocrysts of plagioclase, clinopyroxene, and orthopyroxene. The overlap of the estimated compositional range with the trend of whole-rock composition represents the chemical compositions of the end-members of magma mixing, yielding estimates of the mafic (SiO2 ≈ 45 wt %) and felsic (SiO2 ≈ 68 wt %) end-member magmas. Furthermore, we estimate the concentrations of other elements in the end-member magmas by substituting the estimated SiO2 concentrations of the magmas into linear regression equations between the whole-rock contents of other elements and SiO2. The trace-element compositions of the mafic and felsic end-member magmas, as estimated in this study, have similar features to those of gabbroids and Cretaceous granitic rocks, respectively, that are presumed to lie beneath Yufu Volcano. These similarities could be explained by the possibility that the compositions of the end-member magmas were influenced by basement rocks.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390571939468","@type":"Researcher","foaf:name":[{"@value":"Ikuo Okada"}],"jpcoar:affiliationName":[{"@value":"Hiroshima University Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, , 1-3-1, Kagamiyama,Higashihiroshima, Hiroshima 739-8526, Japan"},{"@value":"Hiroshima Institute of Plate Convergence Region Research , 1-3-1, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan"},{"@value":"AIST Geological Survey Japan, , Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390571939717","@type":"Researcher","foaf:name":[{"@value":"Tomoyuki Shibata"}],"jpcoar:affiliationName":[{"@value":"Hiroshima University Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, , 1-3-1, Kagamiyama,Higashihiroshima, Hiroshima 739-8526, Japan"},{"@value":"Hiroshima Institute of Plate Convergence Region Research , 1-3-1, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390571939594","@type":"Researcher","foaf:name":[{"@value":"Masako Yoshikawa"}],"jpcoar:affiliationName":[{"@value":"Hiroshima University Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, , 1-3-1, Kagamiyama,Higashihiroshima, Hiroshima 739-8526, Japan"},{"@value":"Hiroshima Institute of Plate Convergence Region Research , 1-3-1, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390571939486","@type":"Researcher","foaf:name":[{"@value":"Hidemi Ishibashi"}],"jpcoar:affiliationName":[{"@value":"Shizuoka University Department of Geoscience, Faculty of Science, , 836 Ohya, Suruga-ku, Shizuoka, Shizuoka 422-8529, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390571939331","@type":"Researcher","foaf:name":[{"@value":"Takeshi Sugimoto"}],"jpcoar:affiliationName":[{"@value":"Geothermal Engineering Co., Ltd , 356-6, Ogamaoshimizu, Takizawa, Iwate 020-0758, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390571939589","@type":"Researcher","foaf:name":[{"@value":"Yasutaka Hayasaka"}],"jpcoar:affiliationName":[{"@value":"Hiroshima University Earth and Planetary Systems Science Program, Graduate School of Advanced Science and Engineering, , 1-3-1, Kagamiyama,Higashihiroshima, Hiroshima 739-8526, Japan"},{"@value":"Hiroshima Institute of Plate Convergence Region Research , 1-3-1, Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00223530"},{"@type":"EISSN","@value":"14602415"}],"prism:publicationName":[{"@value":"Journal of Petrology"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"2024-02-29","prism:volume":"65","prism:number":"4"},"reviewed":"false","dc:rights":["https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model"],"url":[{"@id":"https://academic.oup.com/petrology/advance-article-pdf/doi/10.1093/petrology/egae018/56798554/egae018.pdf"},{"@id":"https://academic.oup.com/petrology/article-pdf/65/4/egae018/57136762/egae018.pdf"}],"createdAt":"2024-02-29","modifiedAt":"2024-04-02","project":[{"@id":"https://cir.nii.ac.jp/crid/1040291932574829568","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"22K03755"},{"@type":"JGN","@value":"JP22K03755"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K03755/"}],"notation":[{"@language":"ja","@value":"苦鉄質プリニー式噴火の火道浅部結晶化過程と破砕メカニズムの解明"},{"@language":"en","@value":"Crysallization process and fragmentation mechanism in the shallow conduit of mafic plinian eruption"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050856995325198976","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Experimental Petrology of the 1991–1995 Unzen Dacite, Japan. 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