georefid:2006-012382georefid:2006-012366SEDIS 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=2006-0123822004-01-01publicationgeorefid:2006-012382Thordarson, ThorUniversity of Iceland, Science Institute, Reykjavik, IcelandauthorGeological Society of London, London, United KingdompublisherdocumentHardcopyIn: Fitton, J. Godfrey (editor), Mahoney, John J. (editor), Wallace, Paul J. (editor), Saunders, Andrew D. (editor), Origin and evolution of the Ontong Java Plateau229275-306Detailed analysis of lithologies and lithofacies associations within the 337.7 m thick basement volcaniclastic succession, recovered during Ocean Drilling Program (ODP) Leg 192 at Site 1184 on the Ontong Java Plateau, shows that in bulk it is made up of pyroclastic deposits of phreatomagmatic origin. The succession is essentially made up of two lithologies: lapilli tuff (59% of the total recovered core length) and tuff (34%), consisting almost entirely of juvenile clasts (>97%) and containing significant amounts of matrix-supported accretionary and/or armoured lapilli clasts. The evidence indicates that the succession was formed by at least six (and perhaps as many as 10) major phreatomagmatic eruptions that were subaerial and associated with the main phase of volcanism on the Ontong Java Plateau.completedIgneous and metamorphic petrologyaccretionashbasaltic compositionchemical ratiosemplacementeruptionsgrain sizeigneous rockslapilliLeg 192lithofaciesOcean Drilling ProgramODP Site 1184Ontong Java PlateauPacific Oceanphreatomagmatismpyroclasticsstratigraphic unitstuffvolcanic rocksvolcaniclasticsvolcanismWest Pacificurn:org.iodp:exp:192urnlargerWorkCitationcampaignurn:org.iodp:exp:192:site:1184urnlargerWorkCitationstudyurn:org.iodp:exp:192urnlargerWorkCitationcampaignEnglishgeoscientificInformation164.1400164.1400-5.0100-5.0100