georefid:2005-037574SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G21142.1<gco:CharacterString>Anomalous uplift and subsidence of the Ontong Java Plateau inferred from CO (sub 2) contents of submarine basaltic glasses</gco:CharacterString>2005-01-01publicationgeorefid:2005-037574doi:10.1130/G21142.1Roberge, JulieUniversity of Oregon, Department of Geological Sciences, Eugene, OR, United StatesauthorWallace, Paul J.University of Leicester, United KingdomauthorWhite, Rosalind V.University of Tokyo, JapanauthorCoffin, Millard F.authorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)33 (6)501-504The Ontong Java Plateau in the western Pacific is anomalous compared to other oceanic large igneous provinces in that it appears to have never formed a large subaerial plateau. Paleoeruption depths (at 122 Ma) estimated from dissolved H (sub 2) O and CO (sub 2) in submarine basaltic glass pillow rims vary from approximately 1100 m below sea level (mbsl) on the central part of the plateau to 2200-3000 mbsl on the northeastern edge. Our results suggest maximum initial uplift for the plateau of 2500-3600 m above the surrounding seafloor and 1500 + or - 400 m of postemplacement subsidence since 122 Ma. Our estimates of uplift and subsidence for the plateau are significantly less than predictions from thermal models of oceanic lithosphere, and thus our results are inconsistent with formation of the plateau by a high-temperature mantle plume. Two controversial possibilities to explain the anomalous uplift and subsidence are that the plateau (1) formed as a result of a giant bolide impact, or (2) formed from a mantle plume but has a lower crust of dense garnet granulite and/or eclogite; neither of these possibilities is fully consistent with all available geological, geophysical, and geochemical data. The origin of the largest magmatic event on Earth in the past 200 m.y. thus remains an enigma.completedIgneous and metamorphic petrologyanomaliesbasaltic compositioncarbon dioxideeruptionsexperimental studiesFTIR spectrageochemistryglassesigneous rocksimpactsinfrared spectrainterpretationlarge igneous provincesLeg 192major elementsmantlemantle plumesmarine environmentOcean Drilling ProgramODP Site 1183ODP Site 1184ODP Site 1185ODP Site 1186ODP Site 1187Ontong Java PlateauPacific Oceanplateausspectrasubmarine environmentsubsidencetrace elementsupliftsvolatilesvolcanic glassvolcanic rocksvolcaniclasticsvolcanismwaterWest Pacificurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1183urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1184urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1185urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1186urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1187urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignEnglishgeoscientificInformation157.0100164.1400-5.01000.5600