georefid:2000-080034georefid:2000-080016SEDIS 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.167.207.20002000-01-01publicationgeorefid:2000-080034doi:10.2973/odp.proc.sr.167.207.2000Hovan, Steven A.Indiana University of Pennsylvania, Geoscience Department, Indiana, PA, United StatesauthorKish, S. W.Hokkaido University, JapanauthorRenyck, H. J.Ocean Drilling Program, United StatesauthorTexas A & M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Lyle, Mitchell, Koizumi, Itaru, Richter, Carl, Behl, Richard J., Boden, Per, Caulet, Jean-Pierre, Delaney, Margaret L., deMenocal, Peter, Desmet, Marc, Fornaciari, Eliana, Hayashida, Akira, Heider, Franz, Hood, Julie A., Hovan, Steven A., Janecek, Thomas R., Janik, Aleksandra G., Kennett, James P., Lund, David, Machain Castillo, Maria L., Maruyama, Toshiaki, Merrill, Russell B., Mossman, David J., Pike, Jennifer, Ravelo, A. Christina, Rozo Vera, Gloria A., Stax, Rainer, Tada, Ryuji, Thurow, Juergen W., Yamamoto, Masanobu, Nessler, Susan (editor), Miller, Christine M. (editor), Peters, Lorri L. (editor), Proceedings of the Ocean Drilling Program, scientific results, California margin; covering Leg 167 of the cruises of the drilling vessel JOIDES Resolution, Acapulco, Mexico, to San Francisco, California, sites 1010-1022, 20 April-16 June 1996167227-234The terrigenous mineral fraction of sediments recovered by drilling during Ocean Drilling Program Leg 167 at Sites 1018 and 1020 is used to evaluate changes in the source and transport of fine-grained terrigenous sediment and its relation to regional climates and the paleoceanographic evolution of the California Current system during the late Pleistocene. Preliminary time scales developed by correlation of oxygen isotope stratigraphies with the global SPECMAP record show average linear sedimentation rates in excess of 100 m/m.y., Which provide an opportunity for high-resolution studies of terrigenous flux, grain size, and mineralogy. The mass flux of terrigenous minerals at Site 1018 varies from 5 to 30 g(cm2. k.y.) (super -1) and displays a general trend toward increased flux during glacials. The terrigenous record at Site 1020 shows a similar pattern of increased glacial input, but overall accumulation rates are significantly lower. Spectral analysis demonstrates that most of this variability is concentrated in frequency bands related to orbital cycles of eccentricity, tilt, and precession. Detailed grain-size analysis performed on the isolated terrigenous mineral fraction shows that sediments from Site 1018 are associated with higher energy transport and depositional regimes than those found at Site 1020. Grain-size data are remarkably uniform throughout the last 500 k.y., with no discernible difference observed between glacial and interglacial size distributions within each site. X-ray diffraction analysis of the <2-mu m clay component suggests that the deposition of minerals found at Site 1020 is consistent with transport from a southern source during intervals of increased terrigenous input.completedQuaternary geologyCaliforniaCalifornia CurrentCenozoicclay mineralsclimate forcingcontinental margindepositional environmentEast Pacificgrain sizeLeg 167North PacificNortheast PacificNorthern CaliforniaOcean Drilling ProgramODP Site 1018ODP Site 1020orbital forcingPacific Oceanpaleo-oceanographypaleoclimatologyPleistoceneQuaternarysheet silicatessilicatessize distributionterrigenous materialsUnited Statesupper PleistoceneX-ray diffraction dataurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:167:site:1018urnlargerWorkCitationstudyurn:org.iodp:exp:167urnlargerWorkCitationcampaignurn:org.iodp:exp:167:site:1020urnlargerWorkCitationstudyurn:org.iodp:exp:167urnlargerWorkCitationcampaignEnglishgeoscientificInformation-126.2604-123.163436.592241.0003application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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