Kramer, Philip A.; Swart, Peter K.; De Carlo, Eric Heinen; Schovsbo, Niels H. (2000): Overview of interstitial fluid and sediment geochemistry, sites 1003-1007 (Bahamas Transect). Texas A & M University, Ocean Drilling Program, College Station, TX, United States, In: 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, Dejardin, 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 (editor), 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, 166, 179-195, georefid:2001-002896

A review of interstitial water samples collected from Sites 1003-1007 of the Bahamas Transect along with a shore-based analysis of oxygen and carbon isotopes, minor and trace elements, and sediment chemistry are presented. Results indicate that the pore-fluid profiles in the upper 100 meters below seafloor (mbsf) are marked by shifts between 20 and 40 mbsf that are thought to be caused by changes in sediment reactivity, sedimentation rates, and the influence of strong bottom currents that have been active since the late Pliocene. Pore-fluid profiles in the lower Pliocene-Miocene sequences are dominated by diffusion and do not show significant evidence of subsurface advective flow. Deeper interstitial waters are believed to be the in situ fluids that have evolved through interaction with sediments and diffusion. Pore-fluid chemistry is strongly influenced by carbonate recrystallization processes. Increased in pore-fluid Cl (super -) and Na (super +) with depth are interpreted to result mainly from carbonate remineralization reactions that are most active near the platform margin. A lateral gradient in detrital clay content observed along the transect, leads to an overall lower carbonate reactivity, and enhances preservation of metastable aragonite further away from the platform margin. Later stage burial diagenesis occurs at slow rates and is limited by the supply of reactive elements through diffusion.
West: -79.4500 East: -79.0000 North: 26.0000 South: 24.0000
Expedition: 166
Site: 166-1003
Site: 166-1004
Site: 166-1005
Site: 166-1006
Site: 166-1007
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