Results 161 to 170 of about 855 (200)

Authigenic iron sulfides as paleosalinity indicators

Journal of Sedimentary Research, 1979
Abstract A reasonably good correlation has been found between overlying water salinities and the pyrite-to-"FeS" (acid-volatile iron monosulfides) ratio in modern anoxic sediments below the zone of sulfate reduction. Values of FeS 2 /FeS greater than 10.0 are characteristic of marine sediments, whereas ratios from brackish estuarine ...
R. A. Berner, T. Baldwin, G. R. Holdren
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Sedimentary Phosphate Method for Estimating Paleosalinities

Science, 1967
The widespread occurrence of sedimentary phosphate in argillaceous sediments provides the basis for a new method of paleosalinity estimation. Sedimentary phosphate contains iron- and calcium-phosphate fractions, the relative proportions of which are sensitive to salinity of the water at sites of deposition.
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Archaeal lipids record paleosalinity in hypersaline systems

Organic Geochemistry, 2011
Abstract We present an ecologically based biomarker method for estimating past salinity, especially in hypersaline conditions. The relative amounts of acyclic diether and tetraether membrane lipids synthesized by Archaea correlate with salinity from 0–250 practical salinity units (psu) in modern settings.
Courtney Turich, Katherine H. Freeman
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BORON IN CLAYS AND ESTIMATION OF PALEOSALINITIES

Sedimentology, 1966
SUMMARYExperiments on the uptake of boron by some clays from artificial sea‐water solutions at room temperatures show that the uptake is proportional to the concentration in solution, and takes place in relatively short time. The uptake process can be described by the Freundlich adsorption equation, with the constants in the equation, k and b, varying ...
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Error analysis of paleosalinity calculations

Paleoceanography, 1999
A detailed error analysis is performed for the calculation of open‐ocean salinity changes from carbonate oxygen‐18 proxy data. Measurement errors are generally negligible, however, errors due to the “goodness of fit” of various regressions used in the calculation are significant. Depending on the method used and on the proxies available, error bars (1σ)
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Desiccation features and the reconstruction of paleosalinities

Journal of Sedimentary Research, 1977
Abstract Simple experiments illustrate a marked correlation between the morphology of desiccation cracks and interstitial salinity in carbonate sediments. In a study delineating microfacies and depositional environments in the Grayburg Formation (Permian) of west Texas, a correlation was also seen between the size and spacing of ...
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Boron in illite as an indicator of paleosalinity of Illinois coals

Journal of Sedimentary Research, 1973
Abstract New technique, chemical treatment of illite; salinity no more than ...
B. F. Bohor, H. J. Gluskoter
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Elemental proxies for paleosalinity analysis of ancient shales and mudrocks

Geochimica et Cosmochimica Acta, 2020
Abstract Salinity is a fundamental property of watermasses that is useful in paleoenvironmental and paleoecological studies, yet the theory of application of geochemical proxies to paleosalinity reconstruction is underdeveloped. Here, we explore the use of three elemental ratios for paleosalinity reconstruction: boron/gallium (B/Ga), strontium/barium
Wei Wei, Thomas J. Algeo
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Boron in siliceous materials as a paleosalinity indicator

Geochimica et Cosmochimica Acta, 1981
Abstract The 10B(n, α)7Li nuclear reaction has been used with alpha-sensitive plastic track detectors to determine boron concentrations in siliceous live-collected and fossil sponge spicules. This radiographic technique allows B determinations with 5–6% uncertainties on objects 20–25 μm in diameter and for concentrations as low as 0.5 ppm.
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Sodium: Paleosalinity indicator in ancient carbonate rocks

Geology, 1977
The hypersaline facies of the lower Paleozoic carbonate sequence of Arctic Canada contain ≳230 ppm of soluble Na, whereas their open-marine counterparts are characterized by concentrations below this value. This chemical difference, imposed by sedimentary and (or) diagenetic environments, is preserved in spite of the order of magnitude postdepositional
Jan Veizer, Jean Lemieux, Brian Jones, Martin R. Gibling, Jim Savelle   +4 more
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