{"@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/1360580229798527744.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/petrology/egad009"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/petrology/advance-article-pdf/doi/10.1093/petrology/egad009/49034247/egad009.pdf"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/petrology/article-pdf/64/3/egad009/49524773/egad009.pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"Importance of Long-Term Shallow Degassing of Basaltic Magma on the Genesis of Massive Felsic Magma Reservoirs: a Case Study of Aso Caldera, Kyushu, Japan"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title><jats:p>This paper presents the chemical composition (including H2O and CO2) of matrix glass, melt inclusions in phenocrysts, and their host minerals in eruptive products from Aso caldera. We found a group of melt inclusions with clearly lower potassium (0.6–2 wt % K2O at 50–70 wt % SiO2) than previously reported high-K2O whole-rock compositions (3–5 wt % K2O at 55–70 wt % SiO2). While most of the high-K2O intermediate to felsic melt inclusions are vapor undersaturated and show the features of H2O, CO2, and K2O accumulation, the low-K2O basaltic melt already has higher H2O and CO2. We reconcile this discrepancy with a model in which (1) the volatile-rich basalt magmas degas near the surface, (2) migrate back to depths of $\\ge$12 km in the crust, and (3) crystallize feldspar and quartz to produce high-K2O felsic melt, (4) magma mixing among the undegassed, degassed, and evolved magmas. By crystallization, about five times as much low-K2O basaltic magma is required to produce high-K2O felsic magma. The quantity of felsic magma ejected from 270 ka (Aso-1) to 90 ka (Aso-4) requires a basalt magma supply rate of 18 to 31 km3/ka. This magma supply rate is comparable to or less than the present-day production rate of degassed magma (73 km3/ka) at an active center of Aso, Nakadake. These findings suggest volcanic gas flux monitoring has the potential to be a ‘basalt usage meter’ during the dormant period of caldera volcanoes.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380580229798527878","@type":"Researcher","foaf:name":[{"@value":"Isoji Miyagi"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan , AIST 1-1-1-7 Higashi, Tsukuba, Ibaraki 305-8567, JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580229798528136","@type":"Researcher","foaf:name":[{"@value":"Hideo Hoshizumi"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan , AIST 1-1-1-7 Higashi, Tsukuba, Ibaraki 305-8567, JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580229798528006","@type":"Researcher","foaf:name":[{"@value":"Taichi Suda"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan , AIST 1-1-1-7 Higashi, Tsukuba, Ibaraki 305-8567, JAPAN"},{"@value":"Surface Science Laboratories, Toray Research Center , Inc., 3-2-11 Sonoyama, Otsu, Shiga 520-8567, JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580229798528139","@type":"Researcher","foaf:name":[{"@value":"Genji Saito"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan , AIST 1-1-1-7 Higashi, Tsukuba, Ibaraki 305-8567, JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1420564276161674880","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"30353874"},{"@type":"NRID","@value":"1000030353874"},{"@type":"ORCID","@value":"0000-0003-2246-5231"},{"@type":"NRID","@value":"9000375860594"},{"@type":"NRID","@value":"9000288834054"},{"@type":"NRID","@value":"9000414227709"},{"@type":"NRID","@value":"9000408782531"},{"@type":"NRID","@value":"9000408607570"},{"@type":"NRID","@value":"9000411843257"},{"@type":"NRID","@value":"9000414227704"},{"@type":"NRID","@value":"9000411952282"},{"@type":"NRID","@value":"9000408626230"},{"@type":"NRID","@value":"9000411826503"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/miyabuchi"}],"foaf:name":[{"@value":"Yasuo Miyabuchi"}],"jpcoar:affiliationName":[{"@value":"Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University , 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, JAPAN"}]},{"@id":"https://cir.nii.ac.jp/crid/1380580229798528263","@type":"Researcher","foaf:name":[{"@value":"Nobuo Geshi"}],"jpcoar:affiliationName":[{"@value":"Geological Survey of Japan , AIST 1-1-1-7 Higashi, Tsukuba, Ibaraki 305-8567, 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":"2023-02-01","prism:volume":"64","prism:number":"3","prism:startingPage":"egad009"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","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/egad009/49034247/egad009.pdf"},{"@id":"https://academic.oup.com/petrology/article-pdf/64/3/egad009/49524773/egad009.pdf"}],"createdAt":"2023-01-31","modifiedAt":"2023-12-05","project":[{"@id":"https://cir.nii.ac.jp/crid/1040282256994450304","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"19K04951"},{"@type":"JGN","@value":"JP19K04951"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K04951/"}],"notation":[{"@language":"ja","@value":"マグマ水蒸気噴火の発生と推移の予測に向けた層序学的・物質科学的研究"},{"@language":"en","@value":"Tephra stratigraphic and petrological study on prediction of generation and sequence of phreatomagmatic eruptions"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050001202542686336","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Volcanic magma reservoir imaged as a low-density body beneath Aso volcano that terminated the 2016 Kumamoto earthquake rupture"},{"@value":"Volcanic magma reservoir imaged as a low-density body beneath Aso volcano that terminated thr 2016 Kumamoto earthquake rupture"}]},{"@id":"https://cir.nii.ac.jp/crid/1050001202611156864","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Monochromatic infrasound waves observed during the 2014-2015 eruption of Aso volcano, Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1050282677042030336","@type":"Article","resourceType":"学術雑誌論文(journal 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