The oxygen isotopic composition of interstitial waters; evidence for fluid flow and recrystallization in the margin of the Great Bahama Bank

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doi: 10.2973/odp.proc.sr.166.130.2000
Author(s): Swart, Peter K.
Ocean Drilling Program, Leg 166, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Rosenstiel School of Marine and Atmospheric Science, Division of Marine Geology and Geophysics, Miami, FL, United States
Other:
Ocean Drilling Program, United States
Geological Survey of Japan, Japan
Johann Wolfgang Goethe-Universität, Federal Republic of Germany
University of South Carolina, United States
University of Hawaii, United States
CNRS-Centre de Sédimentologie et de Géochimie de la Surface, France
University of Bourgogne, France
University of Michigan, United States
Rice University, United States
University of Sydney, Australia
Lamont-Doherty Earth Observatory, United States
Vrije Universiteit, Netherlands
Nova University, United States
University of Edinburgh, United Kingdom
ETH-Zentrum, Switzerland
University of East Anglia, United Kingdom
University of Houston, United States
Christian-Albrechts-Universität zu Kiel, Federal Republic of Germany
Akita University, Japan
University of Copenhagen, Denmark
Leicester University, United Kingdom
University of Maine, United States
Volume Title: Proceedings of the Ocean Drilling Program, scientific results, Bahamas Transect; covering Leg 166 of the cruises of the drilling vessel JOIDES Resolution, San Juan, Puerto Rico, to Balboa Harbor, Panama, sites 1003-1009, 17 February-10 April 1996
Volume Author(s): Swart, Peter K.; Eberli, Gregor P.; Malone, Mitchell J.; Anselmetti, Flavio S.; Arai, Kohsaku; Bernet, Karin H.; Betzler, Christian; Christensen, Beth A.; De Carlo, Eric Heinen; Déjardin, Pascale M.; Emmanuel, Laurent; Frank, Tracy D.; Haddad, Geoffrey A.; Isern, Alexandra R.; Katz, Miriam E.; Kenter, Jeroen A. M.; Kramer, Philip A.; Kroon, Dick; McKenzie, Judith A.; McNeill, Donald F.; Montgomery, Paul; Nagihara, Seiichi; Pirmez, Carlos; Reijmer, John J. G.; Sato, Tokiyuki; Schovsbo, Niels H.; Williams, Trevor; Wright, James D.; Lowe, Ginny
Source: Proceedings of the Ocean Drilling Program, scientific results, Bahamas Transect; covering Leg 166 of the cruises of the drilling vessel JOIDES Resolution, San Juan, Puerto Rico, to Balboa Harbor, Panama, sites 1003-1009, 17 February-10 April 1996, Peter K. Swart, Gregor P. Eberli, Mitchell J. Malone, Flavio S. Anselmetti, Kohsaku Arai, Karin H. Bernet, Christian Betzler, Beth A. Christensen, Eric Heinen De Carlo, Pascale M. Déjardin, Laurent Emmanuel, Tracy D. Frank, Geoffrey A. Haddad, Alexandra R. Isern, Miriam E. Katz, Jeroen A. M. Kenter, Philip A. Kramer, Dick Kroon, Judith A. McKenzie, Donald F. McNeill, Paul Montgomery, Seiichi Nagihara, Carlos Pirmez, John J. G. Reijmer, Tokiyuki Sato, Niels H. Schovsbo, Trevor Williams, James D. Wright and Ginny Lowe; Ocean Drilling Program, Leg 166, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.166, p.91-98. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 18 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. 6 tables, sketch map
Summary: This study investigates the δ18O of pore waters from Sites 1003 through 1007, drilled along the western margin of the Great Bahama Bank during Leg 166 of the Ocean Drilling Program. These pore waters generally show a positive correlation between δ18O and the concentration of chloride. The exception to this trend is Site 1006, where the pore waters exhibit nonlinear behavior with respect to chloride. The correlation between the concentration of Cl-and δ18O at most of the sites appears to be a coincidence because although the increase in Cl-is a result of diffusion from an underlying source, the increases in δ18O result from the recrystallization of metastable carbonates in the presence of a geothermal gradient. The difference in behavior in the δ18O of the pore water at Site 1006 is probably a result of the relative reduced rate of carbonate recrystallization at this site. The δ18O of the pore waters in the upper portion of the cores shows a pattern similar to the concentration of chloride in that there is an interval of 30-50 m in which neither the δ18O nor the concentration of Cl-changes. This interval is consistent with either an interval of very rapid deposition of sediment or the advection of fluid through the platform. Both the δ18O and the concentration of Cl-increase toward the platform, suggesting an input of saline and isotopically heavy water from the platform surface.
Year of Publication: 2000
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Atlantic Ocean; Bahamas; Carbonates; Caribbean Sea; Caribbean region; Chlorine; Continental margin; Diagenesis; Geochemistry; Great Bahama Bank; Halogens; Hydrochemistry; Isotope ratios; Isotopes; Leg 166; Marine sediments; North Atlantic; O-18/O-16; ODP Site 1003; ODP Site 1004; ODP Site 1005; ODP Site 1006; ODP Site 1007; Ocean Drilling Program; Oxygen; Pore water; Recrystallization; Sediments; Stable isotopes; West Indies
Coordinates: N240000 N250000 W0790000 W0794500
Record ID: 2001002887
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