georefid:2013-041271SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1093/gji/ggs100<gco:CharacterString>Palaeointensity determinations and rock magnetic properties on basalts from Shatsky Rise; new evidence for a Mesozoic dipole low</gco:CharacterString>2013-01-01publicationgeorefid:2013-041271doi:10.1093/gji/ggs100Carvallo, C.Universite Pierre et Marie Curie, Institut de Mineralogie et de Physique des Milieux Condensee, Paris, FranceauthorCamps, PierreCNRS, FranceauthorOoga, M.Doshisha University, JapanauthorFanjat, G.Texas A&M University, United StatesauthorSager, W. W.authorOxford University Press on behalf of The Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft and the European Geophysical Society, InternationalpublisherdocumentHardcopyGeophysical Journal International192 (3)986-999IODP Expedition 324 cored igneous rocks from Shatsky Rise, an oceanic plateau in the northwest Pacific Ocean that formed mainly during late Jurassic and Early Cretaceous times. We selected 60 samples from 3 different holes for Thellier-Thellier paleointensity determinations. Induced and remanent magnetization curves measured at low- and high-temperature suggest a diverse and complex magnetic mineralogy, with large variations in Ti content and oxidation state. Hysteresis and FORC measurements show that most samples contain single-domain magnetic grains. After carrying out the paleointensity determinations, only 9 samples satisfied all reliability criteria. These gave paleointensity values between 16.5 and 21.5 mu T, which correspond to average VDM values of (4.9 + or - 0.2) X 1022 Am2 for an estimated age of 140-142 Ma. This value is lower than that for the recent field, which agrees with the hypothesis of a Mesozoic Dipole Low.completedStratigraphySolid-earth geophysicsbasaltsCretaceousdemagnetizationExpedition 324igneous rocksIntegrated Ocean Drilling ProgramIODP Site U1346IODP Site U1347IODP Site U1348IODP Site U1349IODP Site U1350JurassicLower Cretaceousmagnetic propertiesmagnetizationMesozoicNorth PacificNorthwest PacificPacific Oceanpaleointensitypaleomagnetismremanent magnetizationsamplingShatsky RiseThellier methodvolcanic rocksWest Pacificurn:org.iodp:exp:324urnlargerWorkCitationcampaignurn:org.iodp:exp:324:site:U1346urnlargerWorkCitationstudyurn:org.iodp:exp:324urnlargerWorkCitationcampaignurn:org.iodp:exp:324:site:U1347urnlargerWorkCitationstudyurn:org.iodp:exp:324urnlargerWorkCitationcampaignurn:org.iodp:exp:324:site:U1348urnlargerWorkCitationstudyurn:org.iodp:exp:324urnlargerWorkCitationcampaignurn:org.iodp:exp:324:site:U1349urnlargerWorkCitationstudyurn:org.iodp:exp:324urnlargerWorkCitationcampaignurn:org.iodp:exp:324:site:U1350urnlargerWorkCitationstudyurn:org.iodp:exp:324urnlargerWorkCitationcampaignEnglishgeoscientificInformation157.0000163.000032.000038.0000