{"data":{"id":"10.1594/pangaea.714870","type":"dois","attributes":{"doi":"10.1594/pangaea.714870","prefix":"10.1594","suffix":"pangaea.714870","identifiers":[],"alternateIdentifiers":[],"creators":[{"name":"John, Barbara E","givenName":"Barbara E","familyName":"John","affiliation":[],"nameIdentifiers":[]},{"name":"Foster, David A","givenName":"David A","familyName":"Foster","nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0002-5603-9372","nameIdentifierScheme":"ORCID"}],"affiliation":[]},{"name":"Murphy, John M","givenName":"John M","familyName":"Murphy","affiliation":[],"nameIdentifiers":[]},{"name":"Cheadle, Michael J","givenName":"Michael J","familyName":"Cheadle","affiliation":[],"nameIdentifiers":[]},{"name":"Baines, A Graham","givenName":"A Graham","familyName":"Baines","affiliation":[],"nameIdentifiers":[]},{"name":"Fanning, C Mark","givenName":"C Mark","familyName":"Fanning","nameIdentifiers":[{"schemeUri":"https://orcid.org","nameIdentifier":"https://orcid.org/0000-0003-3331-3145","nameIdentifierScheme":"ORCID"}],"affiliation":[]},{"name":"Copeland, Peter","givenName":"Peter","familyName":"Copeland","affiliation":[],"nameIdentifiers":[]}],"titles":[{"title":"Age determination of the lower oceanic crust at ODP Hole 176-735B"}],"publisher":"PANGAEA","container":{},"publicationYear":2004,"subjects":[{"subject":"Drilling/drill rig","subjectScheme":"Method"},{"subject":"Leg176","subjectScheme":"Campaign"},{"subject":"Joides Resolution","subjectScheme":"Basis"},{"subject":"Ocean Drilling Program (ODP)","subjectScheme":"Project"}],"contributors":[],"dates":[{"date":"2004","dateType":"Issued"}],"language":"en","types":{"ris":"GEN","bibtex":"misc","citeproc":"article","schemaOrg":"Collection","resourceType":"Supplementary Publication Series of Datasets","resourceTypeGeneral":"Collection"},"relatedIdentifiers":[{"relationType":"IsSupplementTo","relatedIdentifier":"10.1016/j.epsl.2004.02.014","relatedIdentifierType":"DOI"}],"relatedItems":[],"sizes":["3 datasets"],"formats":["application/zip"],"version":null,"rightsList":[{"rights":"Creative Commons Attribution 3.0 Unported","rightsUri":"https://creativecommons.org/licenses/by/3.0/legalcode","schemeUri":"https://spdx.org/licenses/","rightsIdentifier":"cc-by-3.0","rightsIdentifierScheme":"SPDX"}],"descriptions":[{"description":"The cooling history and therefore thermal structure of oceanic lithosphere in slow-spreading environments is, to date, poorly constrained. Application of thermochronometric techniques to rocks from the very slow spreading SW Indian Ridge provide for the first time a direct measure of the age and thermal history of in situ lower oceanic crust. Crystallization of felsic veins (~850°C) drilled in Hole 735B is estimated at 11.93F0.14 Ma, based on U-Pb analyses of zircon by ion probe. This crystallization age is older than the 'crustal age' from remanence inferred from both sea surface and near-bottom magnetic anomaly data gathered over Hole 735B which indicate magnetization between major normal polarity chrons C5n.2n and C5An.1n (10.949-11.935 Ma). 40Ar/39Ar analyses of biotite give plateau ages between 11 and 12 Ma (mean 11.42 +/- 0.21 Ma), implying cooling rates of \u0026gt;800°C/m.y. over the first 500,00 years to temperatures below ~330-400°C. Fission-track ages on zircon (mean 9.35 +/- 1.2 Ma) and apatite reveal less rapid cooling to \u0026lt;110°C by ~7 Ma, some 4-5 m.y. off axis.Comprehensive thermochronometric data from the structurally intact block of gabbro between ~700 and 1100 m below sea floor suggest that crust traversed by ODP Hole 735B mimics conductive cooling over the temperature range ~ 900-330°C, characteristic of a 2-D plate-cooling model for oceanic lithosphere. In contrast, lower temperature chronometers (fission track on zircon, titanite, and apatite; T\u0026lt;=280°C) are not consistent with these predictions and record anomalously high temperatures for crust \u0026gt;700 m below sea floor at 8-10 Ma (i.e. 2-4 m.y. off axis). We offer two hypotheses for this thermal anomaly:(i) Off-axis (or asymmetric) magmatism that caused anomalous reheating of the crust preserved in Hole 735B. This postulated magmatic event might be a consequence of the transtension, which affected the Atlantis II transform from ~19.5 to 7.5 Ma. (ii) Late detachment faulting, which led to significant crustal denudation (2.5-3 km removed), further from the ridge axis than conventionally thought.","descriptionType":"Abstract"},{"description":"Supplement to: John, Barbara E; Foster, David A; Murphy, John M; Cheadle, Michael J; Baines, A Graham; Fanning, C Mark; Copeland, Peter (2004): Determining the cooling history of in situ lower oceanic crust-Atlantis Bank, SW Indian Ridge. Earth and Planetary Science Letters, 222(1), 145-160","descriptionType":"Other"}],"geoLocations":[{"geoLocationPoint":{"pointLatitude":"-32.72321","pointLongitude":"57.26601000000002"}},{"geoLocationPlace":"Indian Ocean"}],"fundingReferences":[],"xml":"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