georefid:2001-025802georefid:2001-025795SEDIS Publication Catalogue

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http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.164.207.20002000-01-01publicationgeorefid:2001-025802doi:10.2973/odp.proc.sr.164.207.2000Paull, Charles K.University of North Carolina at Chapel Hill, Geology Department, Chapel Hill, NC, United StatesauthorLorenson, Thomas D.University of Tokyo, JapanauthorBorowski, Walter S.Ocean Drilling Program, United StatesauthorUssler, William, IIIU. S. Geological Survey, United StatesauthorOlsen, K. B.University of Texas at Arlington, United StatesauthorRodriguez, Nancy M.University of Michigan, United StatesauthorTexas A & M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentHardcopyIn: Paull, Charles K., Matsumoto, Ryo, Wallace, Paul J., Black, Nancy R., Borowski, Walter S., Collett, Timothy S., Damuth, John E., Dickens, Gerald R., Egeberg, Per Kristian, Goodman, Kim, Hesse, Reinhard F., Hiroki, Yoshihisa, Holbrook, W. Steven, Hoskins, Hartley, Ladd, John, Lodolo, Emanuele, Lorenson, Thomas D., Musgrave, Robert J., Naehr, Thomas H., Okada, Hisatake, Pierre, Catherine, Ruppel, Carolyn D., Satoh, Mikio, Thiery, Regis, Watanabe, Yoshio, Wehner, Hermann, Winters, William J., Wood, Warren T., Miller, Christine M. (editor), Reigel, Ruth (editor), Proceedings of the Ocean Drilling Program; volume 164; scientific results; gas hydrate sampling on the Blake Ridge and Carolina Rise; covering Leg 164 of the cruises of the drilling vessel JOIDES Resolution, Halifax, Nova Scotia, to Miami, Florida, sites 991-997, 31 October-19 December 199516467-78The isotopic characteristics of CH (sub 4) (delta (super 13) C values range from -101.3 per mil to -61.1 per mil PDB, and delta D values range from -256 per mil to -136 per mil SMOW) collected during Ocean Drilling Program (ODP) Leg 164 indicate that the CH (sub 4) was produced by microbial CO (sub 2) reduction and that there is not a significant contribution of thermogenic CH (sub 4) to the sampled sediment gas from the Blake Ridge. The isotopic values of CO (sub 2) (delta (super 13) C range -20.6 per mil to +1.24 per mil PDB) and dissolved inorganic carbon (DIC; delta (super 13) C range -37.7 per mil to +10.8 per mil PDB) have parallel profiles with depth, but with an offset of 12.5 per mil. Distinct downhole variations in the carbon isotopic composition of CH (sub 4) and CO (sub 2) cannot be explained by closed-system fractionation where the CO (sub 2) is solely derived from the locally available sedimentary organic matter (delta (super 13) C -2.0 per mil + or - 1.4 per mil PDB) and the CH (sub 4) is derived from CO (sub 2) reduction. The observed isotopic profiles reflect the combined effects of upwards gas migration and decreased microbial activity with depth.completedIsotope geochemistryApplied geophysicsaliphatic hydrocarbonsalkanesAtlantic Oceanbacteriabiogenic processesBlake-Bahama Outer Ridgebottom-simulating reflectorsC-13/C-12carboncarbon dioxideD/Hgeophysical methodshydrocarbonshydrogenisotope ratiosisotopesLeg 164marine sedimentsmethaneNorth AtlanticOcean Drilling ProgramODP Site 994ODP Site 995ODP Site 997organic compoundsorganic materialssedimentsseismic methodsstable isotopesStandard Mean Ocean Waterurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:994urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:995urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignurn:org.iodp:exp:164:site:997urnlargerWorkCitationstudyurn:org.iodp:exp:164urnlargerWorkCitationcampaignEnglishgeoscientificInformation-75.3245-75.280731.470831.5035