georefid:2002-025557SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2002-025557<gco:CharacterString>Epigenesis of sediments in the Cascadia accretionary prism, western continental margin of United States</gco:CharacterString>2001-01-01publicationgeorefid:2002-025557Chamov, N. P.Russian Academy of Sciences, Geological Institute, Moscow, Russian FederationauthorKurnosov, V. B.authorMAIK Nauka/Interperiodica Publishing, Birmingham, AL, United StatespublisherdocumentHardcopyLithology and Mineral Resources36 (5)445-459Upper Miocene to Holocene sediments from the Cascadia accretionary prism and its oceanic surroundings drilled during ODP Leg 146 are studied in order to reveal their alteration during the accretion. The conclusion is made that methane-bearing solutions play a leading role in the transportation of material and the formation of mineralogical-geochemical zonality within the prism. A considerable intensity and high rates of epigenetic alteration are noted. It is shown that low heat flow, absence of progressive subsidence of the accretionary prism, open character of the system relative to water circulation, and heterogeneity of the sedimentary sequence hindered the successive development of epigenesis.completedSedimentary petrologyOceanographyaccretionary wedgesaliphatic hydrocarbonsalkanesalterationCascadia BasinCenozoicchemical compositionclastic sedimentsclay mineralscompression tectonicsconcentrationcontinental marginEast Pacificfaultsfracture zonesgeochemistryHolocenehydrocarbonsLeg 146marine sedimentsmethanemineral compositionMioceneNeogeneNorth PacificNortheast Pacificocean circulationOcean Drilling ProgramODP Site 888ODP Site 889ODP Site 890ODP Site 891ODP Site 892organic compoundsPacific OceanpetrographypetrologyprovenanceQuaternarysandsedimentary rockssedimentssheet silicatessilicatessiltsolutionssubduction zonestectonicsTertiarytransformationsUnited Statesupper Mioceneurn:org.iodp:exp:146urnlargerWorkCitationcampaignurn:org.iodp:exp:146:site:888urnlargerWorkCitationstudyurn:org.iodp:exp:146urnlargerWorkCitationcampaignurn:org.iodp:exp:146:site:889urnlargerWorkCitationstudyurn:org.iodp:exp:146urnlargerWorkCitationcampaignurn:org.iodp:exp:146:site:890urnlargerWorkCitationstudyurn:org.iodp:exp:146urnlargerWorkCitationcampaignurn:org.iodp:exp:146:site:891urnlargerWorkCitationstudyurn:org.iodp:exp:146urnlargerWorkCitationcampaignurn:org.iodp:exp:146:site:892urnlargerWorkCitationstudyurn:org.iodp:exp:146urnlargerWorkCitationcampaignEnglishgeoscientificInformation-126.5253-125.070544.383848.4159