georefid:2006-034502SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1126/science.1116349<gco:CharacterString>Dating the growth of oceanic crust at a slow-spreading ridge</gco:CharacterString>2005-01-01publicationgeorefid:2006-034502doi:10.1126/science.1116349Schwartz, Joshua J.University of Wyoming, Department of Geology and Geophysics, Laramie, WY, United StatesauthorJohn, Barbara E.U. S. Geological Survey, United StatesauthorCheadle, Michael J.Woods Hole Oceanographic Institution, United StatesauthorMiranda, Elena A.authorGrimes, Craig B.authorWooden, Joseph L.authorDick, Henry J. B.authorAmerican Association for the Advancement of Science, Washington, DC, United StatespublisherdocumentDigitalScience310 (5748)654-657Nineteen uranium-lead zircon ages of lower crustal gabbros from Atlantis Bank, southwest Indian Ridge, constrain the growth and construction of oceanic crust at this slow-spreading midocean ridge. Approximately 75% of the gabbros accreted within error of the predicted seafloor magnetic age, whereas approximately 25% are significantly older. These anomalously old samples suggest either spatially varying stochastic intrusion at the ridge axis or, more likely, crystallization of older gabbros at depths of approximately 5 to 18 kilometers below the base of crust in the cold, axial lithosphere, which were uplifted and intruded by shallow-level magmas during the creation of Atlantis Bank.completedSolid-earth geophysicsGeochronologyabsolute ageAtlantis BankCenozoiccrustgabbrosigneous rocksIndian Oceanlithospheremantlemid-ocean ridgesMioceneMohorovicic discontinuityNeogenenesosilicatesOcean Drilling Programocean floorsoceanic crustoceanic lithosphereODP Site 735orthosilicatesplate tectonicsplutonic rockssea-floor spreadingsilicatesSouthwest Indian Ridgespreading centersTertiaryU/Pbzirconzircon groupurn:org.iodp:exp:118:site:735urnlargerWorkCitationstudyurn:org.iodp:exp:118urnlargerWorkCitationcampaignurn:org.iodp:exp:176:site:735urnlargerWorkCitationstudyurn:org.iodp:exp:176urnlargerWorkCitationcampaignEnglishgeoscientificInformation57.100057.2500-32.5500-32.3500Supporting material available onlineapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.sciencemag.org/content/310/5748/654.full.pdfdownload