Late Quaternary stratigraphy and sedimentation at Site 1002, Cariaco Basin (Venezuela)

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doi: 10.2973/odp.proc.sr.165.017.2000
Author(s): Peterson, Larry C.; Haug, Gerald H.; Murray, Richard W.; Yarincik, K. M.; King, John W.; Bralower, Timothy J.; Kameo, Koji; Rutherford, S. D.; Pearce, Richard B.
Author Affiliation(s): Primary:
Rosenstiel School of Marine and Atmospheric Science, Miami, FL, United States
Other:
University of Rhode Island, United States
Ocean Drilling Program, United States
University of Puerto Rico, Puerto Rico
University of North Carolina at Chapel Hill, United States
Paleontological Research Institution, United States
Université de Lyon I, France
Rice University, United States
Université Pierre et Marie Curie, France
INGEOMINAS, Colombia
GEOMAR, Federal Republic of Germany
Teikoku Oil Company, Japan
Danmarks Tekniske Universitet, Denmark
Institut Mediterranéen de Technologie, France
University of Missouri, United States
Boston University, United States
Swiss Federal Institute of Technology, Switzerland
Lamont-Doherty Earth Observatory, United States
University of Southampton, United Kingdom
Durham University, United Kingdom
Rosenstiel School of Marine and Atmospheric Science, United States
Bremen University, Federal Republic of Germany
University of Southern California at Los Angeles, United States
University of North Carolina, United States
Volume Title: Proceedings of the Ocean Drilling Program, scientific results, Caribbean Ocean history and the Cretaceous/Tertiary boundary event; covering Leg 165 of the cruises of the drilling vessel JOIDES Resolution, Miami, Florida, to San Juan Puerto Rico, sites 998-1002, 19 December 1995-17 February 1996
Volume Author(s): Leckie, R. Mark; Sigurdsson, Haraldur; Acton, Gary D.; Abrams, Lewis J.; Bralower, Timothy J.; Carey, Steven N.; Chaisson, William P.; Cotillon, Pierre; Cunningham, Andrew D.; D'Hondt, Steven L.; Droxler, André W.; Galbrun, Bruno; Gonzalez, Juan; Haug, Gerald H.; Kameo, Koji; King, John W.; Lind, Ida L.; Louvel, Véronique; Lyons, Timothy W.; Murray, Richard W.; Mutti, Maria; Myers, Greg; Pearce, Richard B.; Pearson, D. Graham; Peterson, Larry C.; Röhl, Ursula; Garman, Phyllis
Source: Proceedings of the Ocean Drilling Program, scientific results, Caribbean Ocean history and the Cretaceous/Tertiary boundary event; covering Leg 165 of the cruises of the drilling vessel JOIDES Resolution, Miami, Florida, to San Juan Puerto Rico, sites 998-1002, 19 December 1995-17 February 1996, R. Mark Leckie, Haraldur Sigurdsson, Gary D. Acton, Lewis J. Abrams, Timothy J. Bralower, Steven N. Carey, William P. Chaisson, Pierre Cotillon, Andrew D. Cunningham, Steven L. D'Hondt, André W. Droxler, Bruno Galbrun, Juan Gonzalez, Gerald H. Haug, Koji Kameo, John W. King, Ida L. Lind, Véronique Louvel, Timothy W. Lyons, Richard W. Murray, Maria Mutti, Greg Myers, Richard B. Pearce, D. Graham Pearson, Larry C. Peterson, Ursula Röhl and Phyllis Garman. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.165, p.85-99. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 59 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; all chapters are also available on the included CD-ROM and on the Web in PDF format; illus., incl. 2 tables, sketch map
Summary: Ocean Drilling Program Site 1002 in the Cariaco Basin was drilled in the final two days of Leg 165 with only a short transit remaining to the final port of San Juan, Puerto Rico. Because of severe time constraints, cores from only the first of the three long replicate holes (Hole 1002C) were opened at sea for visual description, and the shipboard sampling was restricted to the biostratigraphic examination of core catchers. The limited sampling and general scarcity of biostratigraphic datums within the late Quaternary interval covered by this greatly expanded hemipelagic sequence resulted in a very poorly defined age model for Site 1002 as reported in the Leg 165 Initial Reports volume of the Proceedings of the Ocean Drilling Program. Here, we present for the first time a new integrated stratigraphy for Site 1002 based on the standard of late Quaternary oxygen-isotope variations linked to a suite of refined biostratigraphic datums. These new data show that the sediment sequence recovered by Leg 165 in the Cariaco Basin is continuous and spans the time interval from 0 to ∼580 ka, with a basal age roughly twice as old as initially suspected from the tentative shipboard identification of a single biostratigraphic datum. Lithologic subunits recognized at Site 1002 are here tied into this new stratigraphic framework, and temporal variations in major sediment components are reported. The biogenic carbonate, opal, and organic carbon contents of sediments in the Cariaco Basin tend to be high during interglacials, whereas the terrigenous contents of the sediments increase during glacials. Glacioeustatic variations in sea level are likely to exert a dominant control on these first-order variations in lithology, with glacial surface productivity and the nutrient content of waters in the Cariaco Basin affected by shoaling glacial sill depths, and glacial terrigenous inputs affected by narrowing of the inner shelf and increased proximity of direct riverine sources during sea-level lowstands.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Absolute age; Atlantic Ocean; Biostratigraphy; C-14; Carbon; Cariaco Basin; Caribbean Sea; Cenozoic; Chemostratigraphy; Climate change; Cores; Dates; Depositional environment; Hemipelagic environment; Isotope ratios; Isotopes; Leg 165; Lithostratigraphy; Marine environment; Marine sedimentation; North Atlantic; O-18/O-16; ODP Site 1002; Ocean Drilling Program; Oxygen; Paleoclimatology; Quaternary; Radioactive isotopes; Sedimentation; Sedimentation rates; South America; Stable isotopes; Upper Quaternary; Venezuela
Coordinates: N104222 N104222 W0651011 W0651011
Record ID: 2000062882
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