{"@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/1363670321113908096.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1016/j.quaint.2017.05.034"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1040618216315397?httpAccept=text/xml"}},{"identifier":{"@type":"URI","@value":"https://api.elsevier.com/content/article/PII:S1040618216315397?httpAccept=text/plain"}}],"dc:title":[{"@value":"Chronostratigraphy of the Pliocene–Pleistocene boundary in forearc basin fill on the Pacific side of central Japan: Constraints on the spatial distribution of an unconformity resulting from a widespread tectonic event"}],"description":[{"notation":[{"@value":"The upper Ikego Formation (Pliocene) and the Urago Formation (Pliocene to Lower Pleistocene) have been examined for their lithostratigraphy, calcareous nannofossil biostratigraphy, and magnetostratigraphy. Both formations are forearc basin fills exposed on the Miura Peninsula on the Pacific side of central Japan. The boundary between these formations has been previously treated as the western extension of the Kurotaki Unconformity, which was considered to be related to widespread tectonic change at ca. 3 Ma in the Japanese forearc region. However, the presence of the unconformity on the Miura Peninsula remains unclear due to sparse lithostratigraphic and chronostratigraphic data around the boundary between the both formations. In the study area, the Ikego Formation consists mainly of sandy mudstone and the Urago Formation of sandstone and muddy sandstone; both formations contain numerous tuff beds. Key tuff beds and the last appearance of Discoaster tamalis have been identified in the upper Ikego Formation and the lower Urago Formation, allowing these formations to be considered conformable. The following continuous stratigraphic markers were identified (in ascending order): top of the Mammoth Subchronozone (3.21 Ma); base (3.13 Ma) and top (3.05 Ma) of the Kaena Subchronozone; last appearance of Discoaster tamalis (2.76 Ma); the widespread tuff bed KGP (ca. 2.5 Ma); and the last appearance of Discoaster pentaradiatus (2.41 Ma). Sedimentation rates are almost constant among these age-controlled horizons, which indicates continuous sedimentation from 3.2 to 2.4 Ma. The results indicate that the Kazusa Group conformably overlies the Miura Group on the Miura Peninsula, which provides a well-established continuous stratigraphic section for analyses of regional paleoenvironmental and tectonic evolution in the Japanese forearc region."}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1383670321113908096","@type":"Researcher","foaf:name":[{"@value":"Masayuki Utsunomiya"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670321113908099","@type":"Researcher","foaf:name":[{"@value":"Chie Kusu"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670321113908097","@type":"Researcher","foaf:name":[{"@value":"Ryuichi Majima"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670321113908100","@type":"Researcher","foaf:name":[{"@value":"Yuichiro Tanaka"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670321113908098","@type":"Researcher","foaf:name":[{"@value":"Makoto Okada"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"10406182"}],"prism:publicationName":[{"@value":"Quaternary International"}],"dc:publisher":[{"@value":"Elsevier BV"}],"prism:publicationDate":"2017-10","prism:volume":"456","prism:startingPage":"125","prism:endingPage":"137"},"reviewed":"false","dc:rights":["https://www.elsevier.com/tdm/userlicense/1.0/"],"url":[{"@id":"https://api.elsevier.com/content/article/PII:S1040618216315397?httpAccept=text/xml"},{"@id":"https://api.elsevier.com/content/article/PII:S1040618216315397?httpAccept=text/plain"}],"createdAt":"2017-05-31","modifiedAt":"2018-09-01","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1361131414329824640","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Spatial Distribution of Mass‐Transport Deposits Deduced From High‐Resolution Stratigraphy"}]},{"@id":"https://cir.nii.ac.jp/crid/1390566775151166592","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Correlation between a Tephra Bed from Deep (2038 m) Underground below Chiba City, and Kd48 in the Lowermost Kiwada Formation (Lower Pleistocene) on the Boso Peninsula"},{"@language":"ja","@value":"千葉市の地下2038 mのテフラ層と房総半島の下部更新統黄和田層最下部Kd48の対比"},{"@language":"ja-Kana","@value":"チバシ ノ チカ 2038m ノ テフラソウ ト ボウソウ ハントウ ノ カブ コウシントウ オウ ワダソウ サイ カブ Kd48 ノ タイヒ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390576059521288064","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Geology and fossil cold-seep assemblages in the Kazusa Group on the northern Miura Peninsula, central Japan"},{"@language":"ja","@value":"三浦半島北部の上総層群の地質と冷湧水性化学合成化石群集"}]},{"@id":"https://cir.nii.ac.jp/crid/1390586598923202816","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"三浦半島北部，池子層のテフラ層序と鮮新世広域テフラとの対比"},{"@language":"en","@value":"Tephrostratigraphy of the Pliocene Ikego Formation on the northern Miura Peninsula and correlation with widespread tephra beds in central Japan"},{"@language":"ja-Kana","@value":"ミウラ ハントウ ホクブ,イケゴソウ ノ テフラソウ ジョ ト センシンセイ コウイキ テフラ ト ノ タイヒ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390846609817309440","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Paleomagnetic data as a test of correlations of the Pliocene Wakebe tephra in the Tokai Group, central Japan"}]},{"@id":"https://cir.nii.ac.jp/crid/2050588892089886720","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Pliocene integrated chronostratigraphy from the Anno Formation, Awa Group, Boso Peninsula, central Japan, and its paleoceanographic implications"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1016/j.quaint.2017.05.034"},{"@type":"OPENAIRE","@value":"doi_dedup___::3831b3bfac1b7f2b338a978c48663929"},{"@type":"CROSSREF","@value":"10.5026/jgeography.129.355_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"},{"@type":"CROSSREF","@value":"10.1186/s40645-018-0248-8_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"},{"@type":"CROSSREF","@value":"10.5575/geosoc.2022.0030_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"},{"@type":"CROSSREF","@value":"10.9795/bullgsj.76.3_133_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"},{"@type":"CROSSREF","@value":"10.1002/9781119500513.ch4_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"},{"@type":"CROSSREF","@value":"10.5575/geosoc.2019.0039_references_DOI_9RZglra2U1184vZFvz6EYjl9QfI"}]}