Journal ArticleDOI
Standard for Reporting Concentrations of Deuterium and Oxygen-18 in Natural Waters.
TLDR
A standard, based on the set of ocean water samples used by Epstein and Mayeda to obtain a reference standard for oxygen-18 data, but defined relative to the National Bureau of Standards isotopic reference water sample, is proposed for reporting both deuterium and oxygen- 18 variations in natural watersrelative to the same water.Abstract:
A standard, based on the set of ocean water samples used by Epstein and Mayeda to obtain a reference standard for oxygen-18 data, but defined relative to the National Bureau of Standards isotopic reference water sample, is proposed for reporting both deuterium and oxygen-18 variations in natural waters relative to the same water. The range of absolute concentrations of both isotopes in meteoric-waters is discussed.read more
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Les isotopes du milieu dans les eaux naturelles
TL;DR: In this article, the authors retiendra simplement that certains facteurs intrinseques (cout, niveau de detection, maitrise simultanee de linjection and du rejet) rendent l'usage des traceurs artificiels particulierement adapte aux phenomenes hydrologiques a pas de temps brefs ou a mailles spatiales courtes.
Journal ArticleDOI
Isotopic exchange in mineral-fluid systems. iii: rates and mechanisms of oxygen isotope exchange in the system granite-h2o nacl kcl at hydrothermal conditions
TL;DR: In this paper, a closed-system model with (W/S) mass ratios between 0.5 and 5 was used to estimate the minimum time required for granite-fluid isotopic equilibration to be roughly 200 years or less for grains 1 cm in radius or smaller (porous-media analog) and between 104 and 105 years for grains ranging from 0.1 to 1 m in radius (fractured media analog) reacted at 300°C.
Journal ArticleDOI
Origin and transport of dissolved chemicals in a karst watershed, southwestern illinois
Alan M. Stueber,Robert E. Criss +1 more
Abstract: An extensive base of water quality information emphasizing the effects of land use and hydrology was obtained in the karstified Fountain Creek watershed of southwestern Illinois to help resolve local water quality issues. Agrichemicals dominate the loads of most water quality constituents in the streams and shallow karstic ground water. Only calcium (Ca), magnesium (Mg), Aluminum (A1), and sulfate (SO4) ions are predominantly derived from bedrock or soils, while agrichemicals contribute most of the sodium (Na), potassium (K), chlorine (Cl), nitrate (NO3), fluorine (F), phosphorus (P), and atrazine. Concentrations of individual ions correlate with discharge variations in karst springs and surface streams; highly soluble ions supplied by diffuse ground water are diluted by high flows, while less soluble ions increase with flow as they are mobilized from fields to karst conduits under storm conditions. Treated wastewater containing detergent residues dominates the boron load of streams and provides important subordinate loads of several other constituents, including atrazine derived from the Mississippi River via the public water supply. Average surface water concentrations at the watershed outlet closely approximate a 92:8 mixture of karst ground water and treated wastewater, demonstrating the dominance of ground water contributions to streams. Therefore the karst aquifer and watershed streams form a single water quality system that is also affected by wastewater effluent.
Journal ArticleDOI
Oxygen isotope geochemistry of kaolinite in laterite-forming processes, Manaus, Amazonas, Brazil
Sylvie Giral-Kacmarcı́k,Sylvie Giral-Kacmarcı́k,Samuel M. Savin,Daniel Nahon,Jean-Pierre Girard,Yves Lucas,Linda Abel +6 more
TL;DR: In this paper, a 20 m thick lateritic profile developed on the detrital sands and clays of the mid-Cretaceous to Tertiary Alter-do-Chao formation, central Amazon Basin, Brazil was measured.
Journal ArticleDOI
The change in carbon and oxygen isotopic composition during contact metamorphism of Trenton limestone by the Mount Royal pluton
Peter Deines,D.P. Gold +1 more
TL;DR: The carbon and oxygen isotopic composition of the Trenton limestone was systematically altered by metamorphism associated with the emplacement of the Mount Royal pluton as discussed by the authors, leading to a lower diagnostic value.
References
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Journal ArticleDOI
Isotopic Variations in Meteoric Waters
TL;DR: The relationship between deuterium and oxygen-18 concentrations in natural meteoric waters from many parts of the world has been determined with a mass spectrometer and shows a linear correlation over the entire range for waters which have not undergone excessive evaporation.
Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
TL;DR: In this paper, Niee's and Solenhofen standards were compared to the Chicago PDB standard for carbon and oxygen isotope ratios, and the correction factors for instrumental effects and for the nature of the mass spectra were derived.
Journal ArticleDOI
Variation of O18 content of waters from natural sources
S Epstein,Toshiko K. Mayeda +1 more
TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.
Journal ArticleDOI
Effect of Low Concentrations of Carbon Dioxide on Photosynthesis Rates of Two Races of Oxyria.
TL;DR: Alpine plants of Oxyria digyna have higher apparent photosynthesis rates at various carbon dioxide concentrations than arctic, sea-level plants of the same species, which may be involved in the survival of plants at high elevations.