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Pore waters saline

Diagenesis and catagenesis can alter the evaporite minerals after burial. For example, high temperatures, pressures, and pore-water salinities characteristic of deep burial lead to the conversion of gypsum into anhydrite. Thus, evaporite mineralogy reflects not only the environmental conditions under which the evaporite was formed, but also those under which diagenesis and catagenesis occurred. [Pg.425]

These data verify that the Gueydan site is freshwater, Barataria intermediate, and Avery Island brackish. It will be noted that pore water salinities are greater than associated open waters. Evapotranspiration may produce such increases in... [Pg.201]

The similarity of pore water salinities and oxygen isotopic compositions in the two formations sug-... [Pg.159]

Funayama, M. Manor, J. S. 1995. Pore water salinity as a tool for evaluating reservoir continuity and fluid migration pathways in the Wilcox Group of Central Louisiana. Transactions of the Gulf Coast Association of Geological Societies, 45 195-201. [Pg.302]

Pandit, B.I., King, M.S., 1979. A study of the effects of pore-water salinity on some physical properties of sedimentary rocks at permafrost temperatures. Can. J. Earth Sci. 16, 1566-1580. [Pg.478]

This removal may also include diffusion of soluble U(VI) from seawater into the sediment via pore water. Uranium-organic matter complexes are also prevalent in the marine environment. Organically bound uranium was found to make up to 20% of the dissolved U concentration in the open ocean." ° Uranium may also be enriched in estuarine colloids and in suspended organic matter within the surface ocean. " Scott" and Maeda and Windom" have suggested the possibility that humic acids can efficiently scavenge uranium in low salinity regions of some estuaries. Finally, sedimentary organic matter can also efficiently complex or adsorb uranium and other radionuclides. [Pg.44]

Iron and manganese have been determined in saline pore water [676] by the following technique. [Pg.242]

Pre-acidified pore water (100 pi, diluted with Millipore Q-water if necessary) was transferred, using an Eppendorf pipette, into a 10 ml volumetric Pyrex flask. To this flask nitric acid (50 pi) was added, and the solution was then brought to volume with Millipore Q-water. Standards were made up by adding various amounts to stock metal solutions (lmg/1), nitric acid (50 pi), and a seawater solution (100 pi) of approximately the same salinity as the samples to be analysed. This final addition ensures that the standards are of approximately the same ionic strength and contain the same salts as the samples. [Pg.242]

A series of processes will control the behaviour of C02 in saline aquifer formations. First, the C02 will displace the formation water (brine) originally in place and will lead to a local increase in pore fluid pressure (van der Meer, 1992). The injected C02 will not be distributed evenly, but will finger out, owing to the lower density than the pore waters and the heterogeneities of the aquifer. Doughty et al. (2001) point out that the shape of the C02 plume in the aquifer will be highly site- and case-specific. Carbon dioxide will rise to the top of the aquifer and migrate at the bottom of the... [Pg.179]

In seawater, physical processes that transport water can also cause mass fluxes and, hence, are another means by which the salinity of seawater can be conservatively altered. The physical processes responsible for water movement within the ocean are turbulent mixing and water-mass advection. Turbulent mixing has been observed to follow Pick s first law and, hence, is also known as eddy diffusion. The rate at which solutes are transported by turbulent mixing and advection is usually much faster than that of molecular diffusion. Exceptions to this occur in locations where water motion is relatively slow, such as the pore waters of marine sediments. The effects of advection and turbulent mixing on the transport of chemicals are discussed further in Chapter 4. [Pg.61]

Subterranean esmaries Coastal aquifers in which saline pore waters mix with terrestrial... [Pg.889]

Of special interest in recent years has been the analysis of natural gas hydrates that form in marine sediments and polar rocks when saline pore waters are saturated with gas at high pressure and low temperature. Large and 5D-variations of hydrate bound methane, summarized by Kvenvolden (1995) and Milkov (2005), suggest that gas hydrates represent complex mixtures of gases of both microbial and thermogenic origin. The proportions of both gas types can vary significantly even between proximal sites. [Pg.188]

The electrokinetic process will be limited by the solnbUity of the contaminant and the desorption from the clay matrix that is contaminated. Heterogeneities or anomalies in the soil wiU rednce removal efficiencies. Extreme pHs at the electrodes and the may inhibit the system s effectiveness. Electrokinetic remediation is most efficient when the pore water has low salinity. The process requires sufficient pore water to transmit the electrical charge. Contaminant and noncontaminant concentrations effect the efficiency of the process. [Pg.534]

In the solar evaporation ponds, salinities in the cores reached almost four times oceanic values. In these cores the concentration profile of bimane sulfide with depth also tracked that of methylene blue sulfide and bimane total reduced sulfur tracked DTNB. However, the difference between the bimane method and the other two methods is unacceptably large and suggests that there was some inhibition of the bimane reaction. Pore water samples which were diluted to normal seawater salinity with 200 mM HEPES buffer pH 8 were not inhibited. Dilution will of course lead to a loss of sensitivity for trace thiols. Another factor which can effect the yield of the bimane reaction is the unusual... [Pg.256]

The first step in the formation of coal is the alteration of plant material into peat by biochemical (i.e., microbial) processes. The overall properties and composition of a given peat depend upon the environmental conditions that existed during the alteration period after burial. During the biochemical stage, microorganisms can reduce the sulfate in saline pore water to an active form of sulfur, e.g., H2S. H2S will react with components of the sediment, forming pyrite when iron is present and forming... [Pg.61]

Pore waters were analyzed for pH, alkalinity, salinity, and sulfate concentration following centrifugation. pH was measured with a Ross combination electrode standardized with commercial NIST traceable buffers. Alkalinity determinations were made by a single addition of 0.01 N HCL (5). Salinity was determined with a refractometer, and with an accuracy of +/- 0.5 o/oo. Sulfate was determined turbidimetrically (6). [Pg.214]


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Pore waters

Saline

Saline waters

Salinity

Salinity, saline

Salinization

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