georefid:2006-002208SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2006-0022082002-01-01publicationgeorefid:2006-002208Sato, H.University of Tokyo, Ocean Research Institute, Tokyo, JapanauthorMachida, S.Yamagata University, JapanauthorKanayama, S.Komazawa University, JapanauthorTaniguchi, H.authorIshii, T.authorGeochemical Society of Japan, Nagoya, JapanpublisherdocumentHardcopyGeochemical Journal36 (5)519-526The Kinan Seamount Chain lies close to the extinct spreading center of the Shikoku Basin, one of the largest marginal basins in the western Pacific region. Geochemical and isotopic analyses reveal that basalts from the Kinan Seamount Chain have the following characteristics that differ from the Shikoku Basin tholeiite: 1) more incompatible element enriched compositions, 2) lower abundance of the heavy rare earth elements (HREE), and 3) higher (super 87) Sr/ (super 86) Sr and lower (super 143) Nd/ (super 144) Nd ratios. These results indicate: 1) a more enriched mantle source for basalts from the Kinan Seamount Chain, 2) existence of clinopyroxene and/or amphibole in their residual mantle, and 3) mixing of magmas from a normal MORB source with the EMI signature and an ocean-island basalt (OIB) source with the EMII signature; and 4) the latter has a more significant contribution to the Kinan Seamount Chain basalts than the Shikoku Basin tholeiite.completedIsotope geochemistryIgneous and metamorphic petrologyalkaline earth metalsamphibole groupback-arc basinsbasaltsbasinschain silicatesclinopyroxeneDeep Sea Drilling ProjectDSDP Site 444geochemistryigneous rocksincompatible elementsIPODisotope ratiosisotopesKinan seamount chainLeg 58magmasmantlemarginal basinsmass spectrametalsmid-ocean ridge basaltsmixingNd-144/Nd-143neodymiumNorth PacificNorthwest Pacificocean-island basaltsPacific OceanPhilippine Sea Plateplate tectonicsprovenancepyroxene grouprare earthssea-floor spreadingseamountsShikoku Basinsilicatesspectraspreading centersSr-87/Sr-86stable isotopesstrontiumthermal ionization mass spectratholeiitic basaltupwellingvolcanic rocksWest Pacificurn:org.iodp:exp:58urnlargerWorkCitationcampaignurn:org.iodp:exp:58:site:444urnlargerWorkCitationstudyurn:org.iodp:exp:58urnlargerWorkCitationcampaignEnglishgeoscientificInformation137.4102137.410228.381528.3815