{"@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/1363670318869862144.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1126/science.259.5102.1733"}},{"identifier":{"@type":"URI","@value":"https://www.science.org/doi/pdf/10.1126/science.259.5102.1733"}}],"dc:title":[{"@value":"The\n            <sup>18</sup>\n            O/\n            <sup>16</sup>\n            O Ratio of 2-Billion-Year-Old Seawater Inferred from Ancient Oceanic Crust"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>\n            An oxygen isotope profile of the 2-billion-year-old Purtuniq ophiolite overlaps with similar profiles of younger ophiolites and the modern oceanic crust. This overlap implies (i) that there was a similar style of seawater—ocean crust interaction during the past 2 billion years; (ii) that the oxygen isotope composition of early Proterozoic seawater was similar to the modern value; (iii) that early Proterozoic sea-floor spreading rates were similar to, or greater than, average modern rates; and (iv) that early Proterozoic carbonate rocks and cherts with low\n            <jats:sup>18</jats:sup>\n            O/\n            <jats:sup>16</jats:sup>\n            O ratios do not reflect global-scale\n            <jats:sup>18</jats:sup>\n            O depletion of early Proterozoic oceans.\n          </jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380285711830744332","@type":"Researcher","foaf:name":[{"@value":"C. Holmden"}],"jpcoar:affiliationName":[{"@value":"Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670318869862144","@type":"Researcher","foaf:name":[{"@value":"K. Muehlenbachs"}],"jpcoar:affiliationName":[{"@value":"Department of Geology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00368075"},{"@type":"EISSN","@value":"10959203"}],"prism:publicationName":[{"@value":"Science"}],"dc:publisher":[{"@value":"American Association for the Advancement of Science (AAAS)"}],"prism:publicationDate":"1993-03-19","prism:volume":"259","prism:number":"5102","prism:startingPage":"1733","prism:endingPage":"1736"},"reviewed":"false","url":[{"@id":"https://www.science.org/doi/pdf/10.1126/science.259.5102.1733"}],"createdAt":"2006-10-05","modifiedAt":"2024-01-12","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232135238656","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Depth variation of carbon and oxygen isotopes of calcites in Archean altered upperoceanic crust: Implications for the CO2 flux from ocean to oceanic crust in the Archean"}]},{"@id":"https://cir.nii.ac.jp/crid/1360005516734725504","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"SIMS oxygen isotopes indicate Phanerozoic fluids permeated a Precambrian gold deposit"}]},{"@id":"https://cir.nii.ac.jp/crid/2051151842029083008","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Weak hydrothermal carbonation of the Ongeluk volcanics : evidence for low CO2 concentrations in seawater and atmosphere during the Paleoproterozoic global glaciation"}]}],"dataSourceIdentifier":[{"@type":"CROSSREF","@value":"10.1126/science.259.5102.1733"},{"@type":"CROSSREF","@value":"10.1016/j.epsl.2011.12.034_references_DOI_RNhEUyWd1bTQUjmehIyLaVLUtV8"},{"@type":"CROSSREF","@value":"10.1186/s40645-017-0145-6_references_DOI_RNhEUyWd1bTQUjmehIyLaVLUtV8"},{"@type":"CROSSREF","@value":"10.1016/j.chemgeo.2019.119429_references_DOI_RNhEUyWd1bTQUjmehIyLaVLUtV8"}]}