Geochemical studies of sediments and interstitial waters from the Kerguelen Plateau and Prydz Bay, Antarctica

Author(s): Chambers, Steven Ralph
Source: 255p. Institution: Stanford University, Stanford, CA, United States
Note: In English. Doctoral dissertation
Summary: This dissertation comprises most of what is known about low-temperature geochemical cycling in Prydz Bay and the Kerguelen Plateau. Sediment and interstitial water samples were collected during Leg 119 of the Ocean Drilling Program and analyzed with a variety of chemical, mineralogical, and isotopic techniques to quantify the chemical exchanges between marine waters and solid crustal components beneath the seafloor. In Prydz Bay, highly compacted glacial sediments provide barriers to the vertical diffusion of solutes in pore waters. Extensive erosion associated with glacial advances has limited the amount of marine organic matter incorporated into sediments on the continental shelf. On the Kerguelen Plateau, variations in the concentrations of major cations in pore waters are the result of reactions involving volcanic matter in the sediments and/or basement. Strontium concentrations of interstitial waters increase with depth as a result of the recrystallization of calcium carbonate. Chemical and isotopic analyses indicate equilibrium between solid carbonates and their coexisting pore fluids below 250 mbsf at one of the sites. (Auth. mod.)
Year of Publication: 1991
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Antarctic Ocean; Antarctica; Calcium carbonate; Cation exchange capacity; Cenozoic; Chemical composition; Cretaceous; D/H; Deuterium; Diffusion; Geochemical cycle; Geochemistry; Hydrogen; Indian Ocean; Isotopes; Kerguelen Plateau; Leg 119; Mesozoic; Mineral composition; O-18/O-16; ODP Site 737; ODP Site 738; Ocean Drilling Program; Oxygen; Paleo-oceanography; Paleogene; Pore water; Prydz Bay; Recrystallization; Sedimentation rates; Sediments; Southern Ocean; Stable isotopes; Tertiary; Volcanic ash
Coordinates: S501340 S501339 E0730157 E0730157
S624233 S624232 E0824715 E0824714
Record ID: 1992058267
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States