{"@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/1362825894178601472.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1111/j.1751-3928.2001.tb00081.x"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1751-3928.2001.tb00081.x"}},{"identifier":{"@type":"URI","@value":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1751-3928.2001.tb00081.x"}}],"dc:title":[{"@value":"Timing and Duration of Hydrothermal in the Oligocene Hamad Cauldron, SW Japan: Evidence from K‐Ar Ages of Sericites"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p><jats:bold>Abstract: </jats:bold> Crystallinity, chemical compositions and K‐Ar ages of sericites in highly‐sericitized granites and associated fissure‐filling veins were examined to delineate the timing and duration of the hydrothermal activity in the Oligocene Hamada cauldron in the San‐in district, SW Japan. Sericite separates (>2 μm) from the highly‐sericitized granites consist mainly of 2M<jats:sub>1</jats:sub> polytype having high crystallinity and low Kübler indices of 0.22–0.35, while those in the fissure‐filling veins have lower 2M<jats:sub>1</jats:sub>/1Md ratios and crystallinity, and high Kübler indices of 0.29–0.35. This suggests that the sericites in highlysericitized granites were formed at a higher temperature than the vein sericites.</jats:p><jats:p>Sericites from the highly‐sericitized granites of the Kumogi pluton give K‐Ar ages of 30.0±0.7, 30.4±0.7, 30.6±0.7, 30.6±0.7, 32.1±0.7, 32.3±0.7 and 33.0±0.7 Ma (1s̀), while those of the central plutons, 33.8±0.7 and 33.8±0.7 Ma. Sericites in the fissure‐filling veins of the Kumogi granite give K‐Ar ages of 31.0±0.7, 31.5±0.7, 31.6±0.7, 31.7±0.7 and 32.3±0.7 Ma. Biotite separates from the fresh Kumogi granite give K‐Ar ages of 31.7±0.8, 32.0±0.8, 32.7±0.7 and 33.5±0.7 Ma. The K‐Ar age data revealed that the hydrothermal alteration began at about 33 Ma and ended by about 30 Ma and that the period of sericite alteration was nearly synchronous with the cooling of the granite intrusions in the Hamada cauldron.</jats:p><jats:p>Despite intense hydrothermal alteration, the Oligocene granitoids have not accompanied with any economic base metal mineralization. The bulk chemical analyses of sericite separates in the veins indicate that the post‐magmatic fluids were originally barren in heavy metals.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1382825894178601474","@type":"Researcher","foaf:name":[{"@value":"Teyruyoshi Imaoka"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894178601472","@type":"Researcher","foaf:name":[{"@value":"Kazuo Nakashima"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894178601473","@type":"Researcher","foaf:name":[{"@value":"Testumaru Itaya"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894178601475","@type":"Researcher","foaf:name":[{"@value":"Toshinori Okada"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13441698"},{"@type":"EISSN","@value":"17513928"}],"prism:publicationName":[{"@value":"Resource Geology"}],"dc:publisher":[{"@value":"Wiley"}],"prism:publicationDate":"2001-03","prism:volume":"51","prism:number":"1","prism:startingPage":"55","prism:endingPage":"62"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1751-3928.2001.tb00081.x"},{"@id":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1751-3928.2001.tb00081.x"}],"createdAt":"2008-11-05","modifiedAt":"2023-11-19","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1390001206237497216","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Alteration of volcanic and volcaniclastic rocks within Paleogene cauldrons in the San'in district, western Honshu, Japan"},{"@language":"ja","@value":"山陰地方西部の古第三紀コールドロンにおける火山岩類および火山砕屑岩類の変質作用"},{"@language":"ja-Kana","@value":"サンイン チホウ セイブ ノ コ ダイ3キ コールドロン ニ オケル カザンガンルイ オヨビ カザン サイセツガンルイ ノ ヘンシツ サヨウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206240945408","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Eocene Banda and Kushinoyama basalts from southern Okayama district, southwest Japan"},{"@language":"ja","@value":"岡山県南部の始新世番田玄武岩及び串の山玄武岩"},{"@language":"ja-Kana","@value":"オカヤマケン ナンブ ノ シシンセイバンデン ゲンブガン オヨビ グシ ノ ヤマ ゲンブガン"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681214241408","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Cretaceous-Paleogene magmatism in the central San-in district, Southwest Japan: an examination based on Rb-Sr isochron ages"},{"@language":"ja","@value":"山陰中央部における白亜紀～古第三紀火成活動: Rb-Srアイソクロン年代からの検討"},{"@language":"ja-Kana","@value":"サンイン チュウオウブ ニオケル ハクアキ コダイ3キ カセイカツドウ : Rb-Sr アイソクロン ネンダイ カラノ ケントウ"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1111/j.1751-3928.2001.tb00081.x"},{"@type":"OPENAIRE","@value":"doi_dedup___::df134fbe8885d658664f4601191ed486"},{"@type":"CROSSREF","@value":"10.5575/geosoc.111.123_references_DOI_ZydPANDcNy8IWYpKZOEGciJDsMO"},{"@type":"CROSSREF","@value":"10.5575/geosoc.112.415_references_DOI_ZydPANDcNy8IWYpKZOEGciJDsMO"},{"@type":"CROSSREF","@value":"10.5575/geosoc.2016.0052_references_DOI_ZydPANDcNy8IWYpKZOEGciJDsMO"}]}