Mineralogy and petrography of diagenetic dolomite, Peru Margin, ODP Leg 201

Online Access: Get full text
doi: 10.2973/odp.proc.sr.201.102.2006
Author(s): Meister, Patrick; McKenzie, J. A.; Warthmann, R.; Vasconcelos, C.
Ocean Drilling Program, Leg 201, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
ETH Zurich, Geologisches Institut, Zurich, Switzerland
Other:
University of Rhode Island, United States
Ocean Drilling Program, United States
University of California Santa Cruz, United States
U. S. Geological Survey, United States
Yale University, United States
University of Bristol, United Kingdom
Carl von Ossietzky Universität Oldenburg, Federal Republic of Germany
Rice University, United States
New Mexico Institute of Mining and Technology, United States
Lamont-Doherty Earth Observatory, United States
Woods Hole Oceanographic Institution, United States
Stockholm University, Sweden
Pennsylvania State University, United States
Japan Marine Science and Technology Center, Japan
ETH Zurich, Switzerland
University of Texas at Dallas, United States
Texas A&M University, United States
Shinshu University, Japan
Federal Institute for Geosciences and Natural Resources, Federal Republic of Germany
Sydney University of Technology, Australia
University of Georgia, United States
Volume Title: 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 2002
Volume Author(s): Jorgensen, Bo B., editor; D'Hondt, Steven L.; Miller, D. Jay; 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.; Guèrin, 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
Source: 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 2002, Bo B. Jorgensen, Steven L. D'Hondt, D. Jay Miller, Ivano W. Aiello, Barbara Bekins, Ruth E. Blake, Barry A. Cragg, Heribert Cypionka, Gerald R. Dickens, Timothy G. Ferdelman, Kathryn H. Ford, Glen L. Gettemy, Gilles Guèrin, Kai-Uwe Hinrichs, Nils G. Holm, Christopher H. House, Fumio Inagaki, Patrick Meister, Richard M. Mitterer, Thomas H. Naehr, Sachiko Niitsuma, R. John Parkes, Axel Schippers, C. Gregory Skilbeck, David C. Smith, Arthur J. Spivack, Andreas P. Teske and Juergen Wiegel; Ocean Drilling Program, Leg 201, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.201, 34p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Available only on CD-ROM in PDF format and on the Web in PDF or HTML. 28 refs.CD-ROM, ISSN 1096-2514; WWW, ISSN 1096-7451; illus., incl. strat. cols., 13 tables, sketch map
Summary: Dolomite 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.
Year of Publication: 2006
Research Program: ODP Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Accretionary wedges; Algae; Biogenic processes; Biostratigraphy; Carbonate rocks; Carbonatization; Cenozoic; Continental margin; Cores; Diagenesis; Diatoms; Dolomitization; Dolostone; East Pacific; Eocene; Equatorial Pacific; Foraminifera; Invertebrata; Leg 201; Lithostratigraphy; Microfossils; Mineral composition; Ocean Drilling Program; Pacific Ocean; Paleogene; Peru; Plantae; Protista; Quaternary; Sedimentary rocks; South America; Tertiary
Coordinates: S120500 N035000 W0775500 W1103500
Record ID: 2007008201
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.