{"@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/1362825894700815744.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.jseaes.2010.10.002"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1367912010002890?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1367912010002890?httpAccept=text/plain"}}],"dc:title":[{"@value":"K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation"}],"description":[{"notation":[{"@value":"Abstract   Systematic K–Ar dating and geochemical analyses of Paleogene cauldrons in the Sanin Belt of SW Japan have been made to explore the relationship between the timing of their formation and the Paleogene subduction history of SW Japan documented in the Shimanto accretionary complex. We also examine the magma sources and tectonics beneath the backarc region of SW Japan at the eastern plate boundary of Eurasia.  Fifty-eight new K–Ar ages and 19 previously reported radiometric age data show that the cauldrons formed during Middle Eocene to Early Oligocene time (43–30 Ma), following a period of magmatic hiatus from 52 to 43 Ma. The hiatus coincides with absence of an accretionary prism in the Shimanto Belt. Resumption of the magmatism that formed the cauldron cluster in the backarc was concurrent with voluminous influx of terrigenous detritus to the trench, as a common tectono-thermal event within a subduction system.  The cauldrons are composed of medium-K calc-alkaline basalts to rhyolites and their plutonic equivalents. These rocks are characterized by lower concentrations of large ion lithophile elements (LILE) including K2O, Ba, Rb, Th, U and Li, lower (La/Yb)n ratios, lower initial Sr isotopic ratios (0.7037–0.7052) and higher eNd(T) values (−0.5 to +3.5) relative to Late Cretaceous to Early Paleogene equivalents. There are clear trends from enriched to depleted signatures with decreasing age, from the Late Cretaceous to the Paleogene. The same isotopic shift is also confirmed in lower crust-derived xenoliths, and is interpreted as mobilization of pre-existing enriched lithospheric mantle by upwelling depleted asthenosphere.  Relatively elevated geothermal gradients are presumed to have prevailed over wide areas of the backarc and forearc of the SW Japan arc-trench system during the Eocene to Oligocene. Newly identified Late Eocene low silica adakites and high-Mg andesites in the Sanin Belt and Early Eocene A-type granites in the SW Korea Peninsula probably formed due to upwelling of hot asthenosphere and subduction of a young plate.  The backarc region was an extensional tectonic setting, and some Paleogene rift basins and Sanin Belt cauldrons occur in linear arrays. The Eocene–Oligocene Sanin-SE Korea continental arc lies on the NE extension of the East China Sea Basin, the initial stage of which probably formed by continental arc rifting. This rifting may have been triggered by upwelling of hot asthenosphere into the wedge space created by rollback of the subducted slab, in response to decreased convergence rate between the Pacific and Eurasian plates."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390583836043","@type":"Researcher","foaf:name":[{"@value":"T. Imaoka"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815747","@type":"Researcher","foaf:name":[{"@value":"K. Kiminami"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815746","@type":"Researcher","foaf:name":[{"@value":"K. Nishida"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815745","@type":"Researcher","foaf:name":[{"@value":"M. Takemoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815744","@type":"Researcher","foaf:name":[{"@value":"T. Ikawa"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815750","@type":"Researcher","foaf:name":[{"@value":"T. Itaya"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815748","@type":"Researcher","foaf:name":[{"@value":"H. Kagami"}]},{"@id":"https://cir.nii.ac.jp/crid/1382825894700815751","@type":"Researcher","foaf:name":[{"@value":"S. Iizumi"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13679120"}],"prism:publicationName":[{"@value":"Journal of Asian Earth Sciences"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2011-01","prism:volume":"40","prism:number":"2","prism:startingPage":"509","prism:endingPage":"533"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/","https://www.elsevier.com/legal/tdmrep-license"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S1367912010002890?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S1367912010002890?httpAccept=text/plain"}],"createdAt":"2010-10-26","modifiedAt":"2025-10-24","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050859525241640576","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Strain and stress gradients through the backarc regions of Miocene western 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migration"}]},{"@id":"https://cir.nii.ac.jp/crid/1360864117559089280","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Late<scp>Triassic A</scp>‐type granite boulders in Lower Cretaceous conglomerate of the<scp>Hida belt, Japan</scp>: Their origin and bearing on the<scp>Yamato</scp>tectonic line in<scp>Far East Asia</scp>"}]},{"@id":"https://cir.nii.ac.jp/crid/1360869855116226944","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Petrogenesis of an Episyenite from Iwagi Islet, Southwest Japan: Unique Li–Na Metasomatism during the Turonian"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206240744832","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Radiometric ages of the Akashima Formation, Oga Peninsula, NE Japan"},{"@language":"ja","@value":"東北日本男鹿半島，赤島層の放射年代"},{"@language":"ja-Kana","@value":"トウホク ニホン オガ ハントウ,セキトウソウ ノ ホウシャ ネンダイ"}]},{"@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/1390001206241251456","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Igneous activity forming hybrid rocks and leucogranites in the Obara area, San'in zone, Southwest Japan"},{"@language":"ja","@value":"山陰帯島根県尾原に分布する混成岩および優白質花崗岩の火成活動"},{"@language":"ja-Kana","@value":"サンインタイ シマネケン ビ ゲン ニ ブンプ スル コンセイガン オヨビ ユウ ハクシツ ハナオカガン ノ カセイカツドウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206242137856","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Marked change of Sr-Nd isotopic compositions of granitoids in Sanin Belt of SW Japan and Gyeongsang Basin of Korea during the latest Cretaceous, and geologic significance"},{"@language":"ja","@value":"西南日本山陰帯と韓国慶尚盆地の花崗岩類における白亜紀最末期のSr–Nd同位体組成変化とその意義"},{"@language":"ja-Kana","@value":"セイナン ニホン サンイン タイ ト カンコク ケイショウ ボンチ ノ カコウガン ルイ ニオケル ハクアキ サイマツキ ノ Sr-Nd ドウイタイ ソセイ ヘンカ ト ソノ イギ"},{"@language":"ja-Kana","@value":"セイナン ニホン サンインタイ ト カンコクケイナオ ボンチ ノ ハナオカガンルイ ニ オケル ハクアキ サイマッキ ノ Sr-Nd ドウイタイ ソセイ ヘンカ ト ソノ イギ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001277349196416","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geology of Late Cretaceous caldera cluster in central part of Yamaguchi Prefecture, Japan"},{"@language":"ja","@value":"山口県中央部の後期白亜紀カルデラ群の地質"},{"@value":"巡検案内書 山口県中央部の後期白亜紀カルデラ群の地質 : 吉部,山口,生雲,佐々並カルデラ"},{"@language":"ja-Kana","@value":"ジュンケン アンナイショ ヤマグチケン チュウオウブ ノ コウキ ハクアキ カルデラグン ノ チシツ : キチブ,ヤマグチ,ナマ ウン,ササ ヘイ カルデラ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001288101144704","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Tectonics of sedimentary basins in and around Japan since the opening of the Sea of Japan"},{"@language":"ja","@value":"日本海拡大以来の日本列島の堆積盆テクトニクス"},{"@language":"ja-Kana","@value":"ニホンカイ カクダイ イライ ノ ニホン レットウ ノ タイセキボン テクトニクス"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001288117283584","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Stratigraphic framework of the Green Tuff successions in Japan with reference to the associated geologic events"},{"@language":"ja","@value":"グリーンタフの層序学的枠組みと地質学的事象"},{"@language":"ja-Kana","@value":"グリーンタフ ノ ソウ ジョガクテキ ワクグミ ト チシツガクテキ ジショウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390017068997228544","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Paleogene formations in the northwestern part of Mihara City, Hiroshima Prefecture, south–central part of the Chugoku Region, Japan: Lithofacies and zircon U–Pb ages of interbedded fine tuff"},{"@language":"ja","@value":"中国地方中南部，広島県三原市北西部の古第三系:岩相と挟在する細粒凝灰岩のジルコンU–Pb年代"}]},{"@id":"https://cir.nii.ac.jp/crid/1390024578376745728","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"山陰地方東部，鹿野断層近傍に分布するアプライト岩脈のジルコンU–Pb年代"},{"@language":"en","@value":"Zircon U–Pb dating of an aplite dike adjacent to the Shikano Fault, eastern San-in district, southwest Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282679206278656","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Growth and Shrinkage of an Active Continental Margin: Updated Geotectonic History of the Japanese Islands"},{"@language":"ja","@value":"活動的大陸縁の肥大と縮小の歴史―日本列島形成史アップデイト―"},{"@language":"ja-Kana","@value":"カツドウテキ タイリクエン ノ ヒダイ ト シュクショウ ノ レキシ ニホン レットウ ケイセイシ アップデイト"}]},{"@id":"https://cir.nii.ac.jp/crid/1390298234090236416","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Petrogenesis of Oligocene to Miocene volcanic rocks from the Toyama basin of the SW Japan arc: Temporal change of arc volcanism during the back-arc spreading in the Japan Sea"}]},{"@id":"https://cir.nii.ac.jp/crid/1390564238035836288","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Granites of Japan:"},{"@language":"ja","@value":"日本の花崗岩："},{"@value":"日本の花崗岩 : 2017年における総括"},{"@language":"ja-Kana","@value":"ニホン ノ ハナオカガン : 2017ネン ニ オケル ソウカツ"},{"@value":"Granites of Japan: A review at 2017"}]},{"@id":"https://cir.nii.ac.jp/crid/1390582484891616128","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geological significance of the Takada Granodiorite in the San'in batholith, Southwest Japan"},{"@language":"ja","@value":"西南日本の山陰バソリスに分布する高田花崗閃緑岩の地質学的位置づけ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390584342829194496","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"The Tokunoshima Belt: A New Geotectonic Unit in Central Ryukyus, Japan"},{"@language":"ja","@value":"中琉球の新たな地体構造単元「徳之島帯」"}]},{"@id":"https://cir.nii.ac.jp/crid/1390850656304237696","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Reexamination of the stratigraphic position of the Upper Cretaceous Haraokayama Andesite, northwestern Yamaguchi Prefecture, Japan"},{"@language":"ja","@value":"山口県北西部，後期白亜紀原岡山安山岩の層序学的位置の再検討"},{"@language":"ja-Kana","@value":"ヤマグチケン ホクセイブ,コウキ ハクアキ ゲン オカヤマ アンザンガン ノ ソウ ジョガクテキ イチ ノ サイケントウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390853056024200192","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Igneous activity of the Daito granodiorite in the Un-nan area, San'in zone, Southwest Japan"},{"@language":"ja","@value":"山陰帯島根県雲南地域に分布する大東花崗閃緑岩の火成活動"},{"@language":"ja-Kana","@value":"サンインタイ シマネケン ウンナン チイキ ニ ブンプ スル ダイトウ ハナオカセンリョクガン ノ カセイカツドウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390853343593273856","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Temporal and spatial changes of magmatism related to the Japan Sea opening in the Hokuriku region, central Japan:"},{"@language":"ja","@value":"北陸地方における日本海拡大期火成活動の時空変遷："},{"@value":"北陸地方における日本海拡大期火成活動の時空変遷 : 漸新世~中期中新世火山岩類の層序,年代,岩石学的特徴"},{"@language":"ja-Kana","@value":"ホクリク チホウ ニ オケル ニホンカイ カクダイキ カセイカツドウ ノ ジクウ ヘンセン : ゼンシン セイ~チュウキ チュウシンセイ カザンガンルイ ノ ソウ ジョ,ネンダイ,ガンセキガクテキ トクチョウ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390862467736169984","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Tako brecciastone-bearing mudstone layer in the southern coastal region of the Kii Peninsula, southwestern Japan — its age and the formation process 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