georefid:1981-027024georefid:1981-026994SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/dsdp.proc.55.130.1980<gco:CharacterString>Age and chemistry of volcanic rocks dredged from Jingu Seamount, Emperor seamount chain</gco:CharacterString>1980-01-01publicationgeorefid:1981-027024doi:10.2973/dsdp.proc.55.130.1980Dalrymple, G. BrentU. S. Geol. Surv., Menlo Park, CA, United StatesauthorGarcia, Michael O.Univ. Hawaii at Manoa, Honolulu, HI, United StatesauthorTexas A & M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Shambach, James (editor), Jackson, Everett Dale, Koizumi, Itaru, Avdeiko, Gennady, Butt, Arif, Clague, David, Dalrymple, G. Brent, Greene, H. Gary, Karpoff, Anne Marie, Kirkpatrick, R. James, Kono, Masaru, Hsin Yi Ling, McKenzie, Judith, Morgan, Jason, Takayama, Toshiaki, Initial reports of the Deep Sea Drilling Project covering Leg 55 of the cruises of the drilling vessel Glomar Challenger, Honolulu, Hawaii to Yokohama, Japan; July-September 197755685-69340Ar/39Ar incremental heating experiments on three samples dredged from Jingu Seamount indicate that Jingu is 55.4 + or - 0.9 m.y. old, older than the Hawaiian-Emperor bend and younger than the two dated Emperor Seamounts to the north. Major-oxide chemistry and petrography show that the samples are similar to hawaiites and mugearites from the Hawaiian Islands. By analogy with Hawaiian alkalic volcanic rocks, groundmass plagioclase compositions (An40-47) indicate that the three Jingu samples are probably mugearites. These results suggest that Jingu is a Hawaiian-type volcano and that the Emperor volcanoes become progressively older from south to north, as predicted by the hot-spot hypothesis.completedGeochronologyabsolute ageageAr/ArbasaltsCenozoicchemical compositioncompositiondatesDeep Sea Drilling ProjectEmperor Seamountsgeochemistrygeochronologyigneous rocksIPODK/ArLeg 55mineral compositionNorth PacificNorthwest PacificPacific Oceantrace elementsvolcanic rocksWest Pacificurn:org.iodp:exp:55urnlargerWorkCitationcampaignEnglishgeoscientificInformation170.5500172.000038.360038.3800application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://deepseadrilling.org/55/volume/dsdp55_30.pdfdownload