{"@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/1390282680171131776.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.9795/bullgsj.58.133"}},{"identifier":{"@type":"NAID","@value":"130004574590"}}],"dc:title":[{"@language":"en","@value":"Tephrostratigraphy and diatom biostratigraphy of the Miocene Nomura Formation in the Tsugawa area, Niigata, Japan."},{"@language":"ja","@value":"新潟県津川地域に分布する中新統野村層のテフラ層序及び珪藻化石層序との関係"}],"dc:language":"ja","description":[{"type":"abstract","notation":[{"@language":"en","@value":"The middle to upper Miocene tephrostratigraphy was established for the tephra beds intercalated in the Nomura Formation exposed along the Shinazawagawa River in the Tsugawa area, Niigata Prefecture, Japan. Field occurrence, petrographical characteristics (grain-size distribution, mineral composition, heavy mineral composition and shape of volcanic glass shards) and chemical composition of volcanic glass shards were systematically described for the 80 tephra beds. Furthermore, precise numerical age was calculated for each tephra bed on the basis of detailed diatom biochronology of the Nomura Formation. From 12 Ma to 7.5 Ma four stages was discriminated based on the frequency of tephra beds. A tendency of upward decrease of K2O content was recognized in the glass shards in the Nomura Formation."},{"@language":"ja","@value":"新潟県津川地域の品沢川ルートに露出する中新統野村層のテフラ層序を確立し，約 80 層のテフラ層の産状，記載岩石学的特徴（構成粒子組成・火山ガラス形状・有色鉱物組成）と火山ガラスの主成分化学組成を明らかにした．あわせてテフラ層序と珪藻化石層序との直接関係についても検討を行い，各テフラ層の詳しい堆積年代を算定した．また，テフラ層の挟在頻度から 12 Ma ～ 7.5 Ma の間を 4 つのステージに区分した．本地域においては，年代が新しくなるにつれて，テフラ層の挟在頻度が増加し，火山ガラスの K2O 量が減少する傾向が認められた．"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420845751147631488","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"10613531"},{"@type":"NRID","@value":"1000010613531"},{"@type":"NRID","@value":"9000004608728"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0112411"}],"foaf:name":[{"@language":"en","@value":"Hiranaka Hironori"},{"@language":"ja","@value":"平中 宏典"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth Science, Faculty of Education and Human Sciences, Niigata University."},{"@language":"ja","@value":"新潟大学教育人間科学部地学教室"}]},{"@id":"https://cir.nii.ac.jp/crid/1030285133421737856","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"50089835"},{"@type":"NRID","@value":"1000050089835"},{"@type":"CINII_AUTHOR_ID","@value":"DA12200550"},{"@type":"URI","@value":"https://ci.nii.ac.jp/author/DA12200550#entity"},{"@type":"URI","@value":"https://viaf.org/viaf/NII%7CDA12200550"},{"@type":"NRID","@value":"9000391814701"},{"@type":"NRID","@value":"9000345426501"},{"@type":"NRID","@value":"9000004622558"},{"@type":"NRID","@value":"9000004621641"},{"@type":"NRID","@value":"9000283578165"},{"@type":"NRID","@value":"9000017648602"},{"@type":"NRID","@value":"9000004611836"},{"@type":"NRID","@value":"9000254631264"},{"@type":"NRID","@value":"9000283578157"},{"@type":"NRID","@value":"9000004623896"},{"@type":"NRID","@value":"9000004606763"},{"@type":"NRID","@value":"9000021208729"},{"@type":"NRID","@value":"9000021943077"},{"@type":"NRID","@value":"9000240102946"},{"@type":"NRID","@value":"9000258326588"},{"@type":"NRID","@value":"9000006007362"},{"@type":"NRID","@value":"9000254528757"},{"@type":"NRID","@value":"9000240102917"},{"@type":"NRID","@value":"9000254111457"},{"@type":"NRID","@value":"9000018323590"},{"@type":"NRID","@value":"9000006951838"},{"@type":"NRID","@value":"9000254151065"},{"@type":"NRID","@value":"9000254585586"},{"@type":"NRID","@value":"9000283726437"},{"@type":"NRID","@value":"9000258411823"},{"@type":"NRID","@value":"9000365023094"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/read0009225"}],"foaf:name":[{"@language":"en","@value":"Kurokawa  Katsuki"},{"@language":"ja","@value":"黒川 勝己"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Department of Earth Science, Faculty of Education and Human Sciences, Niigata University."},{"@language":"ja","@value":"新潟大学教育人間科学部地学教室"}]},{"@id":"https://cir.nii.ac.jp/crid/1410009221438115200","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000258326589"}],"foaf:name":[{"@language":"en","@value":"Yanagisawa Yukio"},{"@language":"ja","@value":"柳沢 幸夫"}],"jpcoar:affiliationName":[{"@language":"en","@value":"AIST, Geological Survey of Japan, Institute of Geology and Geoinformation"},{"@language":"ja","@value":"地質情報研究部門"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13464272"},{"@type":"LISSN","@value":"13464272"},{"@type":"EISSN","@value":"2186490X"}],"prism:publicationName":[{"@language":"en","@value":"BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN"},{"@value":"地質調査研究報告"},{"@language":"en","@value":"Bull. Geol. Surv. Japan"},{"@value":"地調研報"}],"dc:publisher":[{"@language":"en","@value":"National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan"},{"@language":"ja","@value":"国立研究開発法人 産業技術総合研究所 地質調査総合センター"}],"prism:publicationDate":"2007","prism:volume":"58","prism:number":"5-6","prism:startingPage":"133","prism:endingPage":"188"},"reviewed":"false","availableAt":"2007","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=tephra","dc:title":"tephra"},{"@id":"https://cir.nii.ac.jp/all?q=tephrochronology","dc:title":"tephrochronology"},{"@id":"https://cir.nii.ac.jp/all?q=diatom%20biostratigraphy","dc:title":"diatom biostratigraphy"},{"@id":"https://cir.nii.ac.jp/all?q=Miocene","dc:title":"Miocene"},{"@id":"https://cir.nii.ac.jp/all?q=Neogene","dc:title":"Neogene"},{"@id":"https://cir.nii.ac.jp/all?q=Nomura%20Formation","dc:title":"Nomura Formation"},{"@id":"https://cir.nii.ac.jp/all?q=Tsugawa","dc:title":"Tsugawa"},{"@id":"https://cir.nii.ac.jp/all?q=Niigata","dc:title":"Niigata"},{"@id":"https://cir.nii.ac.jp/all?q=Japan","dc:title":"Japan"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1390282679215275008","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Chronostratigraphy of the Lower to Middle Miocene Successions and Basin Development in the Kamo Area, Niigata Sedimentary Basin, Northeast Japan Arc"},{"@language":"ja","@value":"新潟堆積盆地，加茂地域における下部～中部中新統の年代層序と堆積盆発達史"},{"@language":"ja-Kana","@value":"ニイガタ タイセキ ボンチ カモ チイキ ニ オケル カブ チュウブ チュウ シントウ ノ ネンダイソウ ジョ ト タイセキボン ハッタツシ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681215297664","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Correlation of late Miocene tephra beds in the central area of Niigata Prefecture, northeast Japan"},{"@language":"ja","@value":"新潟県中央部における後期中新世テフラ層の対比"},{"@language":"ja-Kana","@value":"ニイガタケン チュウオウブ ニ オケル コウキ チュウシンセイ テフラソウ ノ タイヒ"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842097198848","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Marine tephra in the Japan Sea sediments as a tool for paleoceanography and paleoclimatology"}]}],"dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:0031002041"},{"@type":"CROSSREF","@value":"10.9795/bullgsj.58.133"},{"@type":"CIA","@value":"130004574590"},{"@type":"CROSSREF","@value":"10.5026/jgeography.120.654_references_DOI_QuY8Z4gM4WMhHfJE0BrFCHrw5so"},{"@type":"CROSSREF","@value":"10.1186/s40645-015-0068-z_references_DOI_QuY8Z4gM4WMhHfJE0BrFCHrw5so"},{"@type":"CROSSREF","@value":"10.5575/geosoc.115.177_references_DOI_QuY8Z4gM4WMhHfJE0BrFCHrw5so"}]}