Chemical and isotopic compositions of pore fluids from ODP Sites 169-1034 and 169-1037

We have analysed the concentrations of Li, K, Rb, Cs, and B, and the isotopic ratios of Li and B of a suite of pore fluids recovered from ODP Sites 1037 (Leg 169; Escanaba Trough) and 1034 (Leg 169S; Saanich Inlet). In addition, we have analysed dissolved K, Rb, and Cs concentrations for estuarine mixing of the Ganges-Brahmaputra river system. Together, these data sets have been used to assess the role of sediments in the marine geochemical cycles of the alkali elements and boron. Uptake onto clay minerals during estuarine mixing removes 20-30% of the riverine input of dissolved Cs and Rb to the oceans. Prior to this study, the only other recognised sink of Rb and Cs was uptake during low-temperature alteration of the oceanic crust. Even with this additional sink there is an excess of inputs over outputs in their modern oceanic mass balance. Pore fluid data show that Li and Rb are transferred into marine sediments during early diagenesis. However, modeling of the Li isotope systematics of the pore fluids from Site 1037 shows that seawater Li taken up during marine sedimentation can be readily returned to solution in the presence of less hydrated cations, such as NH4+. This process also appears to result in high concentrations of pore fluid Cs (relative to local seawater) due to expulsion of adsorbed Cs from cation exchange sites. Flux calculations based on pore fluid data for a series of ODP sites indicate that early diagenesis of clay sediments removes around 8% of the modern riverine input of dissolved Li. Although NH4+-rich fluids do result in a flux of Cs to the oceans, on the global scale this input only augments the modern riverine Cs flux by ~3%. Nevertheless, this may have implications for the fate of radioactive Cs in the natural environment and waste repositories.

Analytical study of the legal and operational aspects of the Minnesota law entitled "Chemical test for intoxication" - M.S.A. Sec. 169.123. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Response to Senate Resolution 169.

Caption title.

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts) : laundry unit, single trailer mounted, w/canvas cover; Army type M532 (Eidal modl [sic] ELT9T), NSN3510-00-782-5294 and (Edro model EP120-LTU), NSN 3510-00-169-4735.

"May 1978."

Direct support and general support maintenance manual : laundry unit, single trailer mounted w/canvas cover; Army model M-532 (Eidal model ELT9T), NSN 3510-00-782-5294 and (Edro model EP-120-LTU), NSN 3510-00-169-4735.

"March 1978."

Organizational maintenance repair parts and special tools lists : laundry unit, single trailer mounted, w/canvas cover; Army type M532 (EIDAL model ELT9T), NSN 3510-00-782-5294 and (EDRO model EP120-LTU), NSN 3510-00-169-4735.

Includes index.

Operator and organizational maintenance manual : laundry unit, single trailer mounted w/canvas cover; Army model M-532 (Eidal model ELT9T), NSN 3510-00-782-5294 and (Edro model EP120-LTU), NSN 3510-00-169-4735.

"September 1977."