{"@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/1362825893555296768.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/petrology/42.1.69"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/petrology/article-pdf/42/1/69/63184442/petrology_42_1_69.pdf"}},{"identifier":{"@type":"NAID","@value":"30018437538"}}],"dc:title":[{"@value":"Metasomatism and Melting in Carbonated Peridotite Xenoliths from the Mantle Wedge: The Gobernador Gregores Case (Southern Patagonia)"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>Spinel-facies mantle xenoliths occur in a diatreme cutting through the Neogene Southern Patagonia Plateau at Gobernador Gregores (Santa Cruz Province, Argentina). This plateau is in a back-arc position with respect to the Chile trench. Xenoliths differ in their whole-rock composition from other South America occurrences, having higher CaO/Al2O3 ratios and, in some samples, TiO2 enrichment, whereas the Na2O/Al2O3 variation range is similar. Three assemblages can be distinguished. Assemblage 1, in anhydrous protogranular lherzolites and harzburgites, contains clinopyroxene with a depleted major and trace element composition, indicating pre-metasomatic depletion processes. This assemblage fully recrystallized to Assemblage 2 (amphibole ± phlogopite ± Cl-apatite-bearing) during a metasomatic episode. This causes clinopyroxene to acquire geochemical characteristics often attributed to carbonate-melt metasomatism. Noticeably, amphibole is markedly enriched in Nb (up to 298 ppm), especially when depleted in Ti. A further event, related to decompression during xenolith uplift to the surface, induces closed-system (perhaps with the exception of CO2 addition) disequilibrium melting of Assemblage 2, dominantly of amphibole. It is found in pockets (where amphibole is a residual phase) consisting of Na–Si-rich glass and carbonate (Mg-rich calcite) drops, and in veins originating from the pockets (Assemblage 3). Euhedral olivine, clinopyroxene and spinel crystallize only in the silicate glass. So do new, euhedral apatite crystals when glass is in contact with previous Assemblage 2 apatite. Textural evidence and comparison with experimental work suggest that silicate glass and carbonates are the result of unmixing of a former homogeneous melt. Because of the different flow rates of carbonate and silicate melt, the xenoliths become enriched in carbonate, which is found in the veins during their migration. Thus, the high CaO/Al2O3 ratio of whole rocks provides inconclusive evidence of carbonatite metasomatism. This factor, and other minor deviations from the expected results of carbonatite metasomatism, lead us to hypothesize an aqueous, Cl-rich fluid, possibly slab derived, as an alternative agent. Amphibole, resulting from reactive porous flow of this agent in the mantle, could fully explain the observed geochemical features, as indicated by estimates of its partition coefficients.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380305195569833732","@type":"Researcher","foaf:name":[{"@value":"ANGELA LAURORA"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833729","@type":"Researcher","foaf:name":[{"@value":"MAURIZIO MAZZUCCHELLI"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833728","@type":"Researcher","foaf:name":[{"@value":"GIORGIO RIVALENTI"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833733","@type":"Researcher","foaf:name":[{"@value":"RICCARDO VANNUCCI"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833730","@type":"Researcher","foaf:name":[{"@value":"ALBERTO ZANETTI"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833600","@type":"Researcher","foaf:name":[{"@value":"MARIA ADELAIDE BARBIERI"}]},{"@id":"https://cir.nii.ac.jp/crid/1380305195569833731","@type":"Researcher","foaf:name":[{"@value":"CARLOS A. CINGOLANI"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"14602415"},{"@type":"PISSN","@value":"00223530"},{"@type":"PISSN","@value":"https://id.crossref.org/issn/00223530"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/00223530"}],"prism:publicationName":[{"@value":"Journal of Petrology"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"2001-01-01","prism:volume":"42","prism:number":"1","prism:startingPage":"69","prism:endingPage":"87"},"reviewed":"false","url":[{"@id":"https://academic.oup.com/petrology/article-pdf/42/1/69/63184442/petrology_42_1_69.pdf"}],"createdAt":"2002-07-26","modifiedAt":"2025-05-15","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360283690913982592","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Chemical interactions in the subduction factory: New insights from an in situ trace element and hydrogen study of the Ichinomegata and Oki-Dogo mantle xenoliths (Japan)"}]},{"@id":"https://cir.nii.ac.jp/crid/1360294643840191488","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Partial melting and subduction-related metasomatism recorded by geochemical and isotope (He-Ne-Ar-Sr-Nd) compositions of spinel lherzolite xenoliths from Coyhaique, Chilean Patagonia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848657065609728","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Noble gas composition of subcontinental lithospheric mantle: An extensively degassed reservoir beneath Southern Patagonia"}]},{"@id":"https://cir.nii.ac.jp/crid/1360848661184495488","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Geochemical and Sr–Nd isotopic characteristics and pressure–temperature estimates of mantle xenoliths from the French Massif Central: evidence for melting and multiple metasomatism by silicate-rich carbonatite and asthenospheric melts"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204237151360","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"マントル捕獲岩の流体包有物から読みとれる情報"},{"@language":"en","@value":"Fluid Inclusions in Mantle Xenoliths: A Probe for the Physical and Chemical State of the Lithospheric Mantle"},{"@language":"ja-Kana","@value":"マントル ホカクガン ノ リュウタイ ホウユウブツ カラ ヨミトレル ジョウホウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001204553605248","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Petrology and geochemistry of the back-arc lithospheric mantle beneath eastern Payunia (La Pampa, Argentina): Evidence from Agua Poca peridotite xenoliths"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206526290304","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Petrography and Geochemistry of the mantle xenoliths: Implications for lithospheric mantle beneath the Japan arcs"},{"@language":"ja","@value":"かんらん岩捕獲岩の記載岩石化学的性質：日本列島下のリソスフェリック・マントルの特徴"},{"@value":"かんらん岩捕獲岩石の記載岩石化学的性質:日本列島下のリソスフェリック・マントルの特徴"},{"@language":"ja-Kana","@value":"カンランガン ホカク ガンセキ ノ キサイ ガンセキ カガクテキ セイシツ ニホン レットウ カ ノ リソスフェリック マントル ノ トクチョウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390009225704418048","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Petrologic characteristics of the upper mantle beneath island arcs"},{"@language":"ja","@value":"島弧上部マントルの岩石学的性質: 何が固有か?"},{"@language":"ja-Kana","@value":"トウコ ジョウブ マントル ノ ガンセキガクテキ セイシツ : ナニ ガ コユウ 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