georefid:2007-127052SEDIS 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=10.1073/pnas.17355811002003-01-01publicationgeorefid:2007-127052doi:10.1073/pnas.1735581100Kenig, FabienUniversity of Illinois, Department of Earth and Environmental Sciences, Chicago, IL, United StatesauthorSimons, Dirk-Jan H.University of Hawaii, United StatesauthorCrich, DavidArgonne National Laboratory, United StatesauthorCowen, James P.authorVentura, Gregory T.authorRehbein-Khalily, TatianaauthorBrown, Todd C.authorAnderson, Ken B.authorNational Academy of Sciences, Washington, DC, United StatespublisherdocumentHardcopyProceedings of the National Academy of Sciences of the United States of America100 (22)12554-12558A pseudohomologous series of branched aliphatic alkanes with a quaternary substituted carbon atom (BAQCs, specifically 2,2-dimethylalkanes and 3,3- and 5,5-diethylalkanes) were identified in warm (65 degrees C) deep-sea hydrothermal waters and Late Cretaceous black shales. 5,5-Diethylalkanes were also observed in modern and Holocene marine shelf sediments and in shales spanning the last 800 million years of the geological record. The carbon number distribution of BAQCs indicates a biological origin. These compounds were observed but not identified in previous studies of 2.0 billion- to 2.2 billion-year-old metasediments and were commonly misidentified in other sediment samples, indicating that BAQCs are widespread in the geological record. The source organisms of BAQCs are unknown, but their paleobiogeographic distribution suggests that they have an affinity for sulfides and might be nonphotosynthetic sulfide oxidizers.completedGeneral geochemistryStratigraphyaliphatic hydrocarbonsalkanesArchaeabacteriabiomarkersblack shaleCanadaCascadia BasinCenomanianCenozoicclastic rocksCretaceousdiethylalkanesEast PacificEhExpedition 301fatty acidsFTIR spectraglobalHolocenehydrocarbonsinfrared spectraIntegrated Ocean Drilling ProgramJuan de Fuca Ridgelipidsmarine environmentmarine sedimentsmass spectraMesoproterozoicMesozoicmodernNeoproterozoicNorth PacificNortheast PacificODP Site 1026organic acidsorganic compoundsoxidationPacific OceanPaleoproterozoicPhanerozoicPrecambrianProterozoicQuaternarysamplingsea watersedimentary rockssedimentsshelf environmentspectrasubstitutionsulfidestemperatureTuronianUpper Cretaceousupper Precambrianurn:org.iodp:exp:301urnlargerWorkCitationcampaignEnglishgeoscientificInformation-127.4526-127.452647.455647.4556