georefid:2007-008201georefid:2007-008188SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.201.102.2006<gco:CharacterString>Mineralogy and petrography of diagenetic dolomite, Peru Margin, ODP Leg 201</gco:CharacterString>2006-01-01publicationgeorefid:2007-008201doi:10.2973/odp.proc.sr.201.102.2006Meister, PatrickETH Zurich, Geologisches Institut, Zurich, SwitzerlandauthorMcKenzie, J. A.University of Rhode Island, United StatesauthorWarthmann, R.Ocean Drilling Program, United StatesauthorVasconcelos, C.University of California Santa Cruz, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Jorgensen, Bo B. (editor), D'Hondt, Steven L. (editor), Miller, D. Jay (editor), Aiello, Ivano W., Bekins, Barbara, Blake, Ruth E., Cragg, Barry A., Cypionka, Heribert, Dickens, Gerald R., Ferdelman, Timothy G., Ford, Kathryn H., Gettemy, Glen L., Guerin, Gilles, Hinrichs, Kai-Uwe, Holm, Nils G., House, Christopher H., Inagaki, Fumio, Meister, Patrick, Mitterer, Richard M., Naehr, Thomas H., Niitsuma, Sachiko, Parkes, R. John, Schippers, Axel, Skilbeck, C. Gregory, Smith, David C., Spivack, Arthur J., Teske, Andreas P., Wiegel, Juergen, Proceedings of the Ocean Drilling Program; scientific results; controls on microbial communities in deeply buried sediments, eastern Equatorial Pacific and Peru Margin; covering Leg 201 of the cruises of the drilling vessel JOIDES Resolution; San Diego, California, to Valparaiso, Chile; Sites 1225-1231; 27 January-29 March 2002201Dolomite sampled during Leg 201 occurs as hard lithified layers surrounded by small amounts of friable dolomite, and its presence is related to organic carbon-rich diatomaceous sediments. Petrographic relationships indicate a shallow depth of dolomite precipitation on the Peru margin. Dolomitic breccia layers found on the lower slope, however, were precipitated contemporaneous with brecciation, which probably took place at greater depth under the influence of tectonic deformation processes in the accretionary prism. In most cases, the formation of coexisting framboidal pyrite postdates the growth of dolomite rhombs. No crystal morphologies indicating a direct influence of bacteria in the precipitation process were observed. Occurrence and morphology of the carbonate layers, however, suggest focused precipitation within the sedimentary sequence. We hypothesize that microbial hot spots discovered during Leg 201 at geochemical boundaries such as the methane/sulfate boundary may be sites of strongly enhanced microbial mediation of dolomite precipitation.completedSedimentary petrologyaccretionary wedgesalgaebiogenic processesbiostratigraphycarbonate rockscarbonatizationCenozoiccontinental margincoresdiagenesisdiatomsdolomitizationdolostoneEast PacificEoceneEquatorial PacificForaminiferaInvertebrataLeg 201lithostratigraphymicrofossilsmineral compositionOcean Drilling ProgramPacific OceanPaleogenePeruPlantaeProtistaQuaternarysedimentary rocksSouth AmericaTertiaryurn:org.iodp:exp:201urnlargerWorkCitationcampaignEnglishgeoscientificInformation-110.3500-77.5500-12.05003.5000Available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www-odp.tamu.edu/publications/201_SR/VOLUME/CHAPTERS/102.PDFdownload