Results 191 to 200 of about 9,719 (242)

Fractionation of oxygen and hydrogen isotopes in evaporating water

Geochimica et Cosmochimica Acta, 2009
Abstract Variations in oxygen and hydrogen isotope ratios of water and ice are powerful tools in hydrology and ice core studies. These variations are controlled by both equilibrium and kinetic isotope effects during evaporation and precipitation, and for quantitative interpretation it is necessary to understand how these processes affect the isotopic
Boaz Luz, Eugeni Barkan, Ruth Yam, Aldo Shemesh   +3 more
openaire   +1 more source

Hydrogen and oxygen isotope systematics in weathering profiles

Geochimica et Cosmochimica Acta, 1972
Abstract δD and δO18 studies undertaken in detail on seven different soil profiles developed on both igneous and sedimentary parent rocks indicate that the parent rock minerals in these soils do not undergo appreciable oxygen or hydrogen isotopic exchange with meteoric waters in the weathering environment.
Lawrence, J. R, Taylor, H. P., Jr.
openaire   +2 more sources

The oxygen and hydrogen isotope geochemistry of clay minerals

Geochimica et Cosmochimica Acta, 1970
Abstract Oxygen and hydrogen isotope analyses have been made on a variety of clay minerals of sedimentary and diagenetic origins. The interlayer water of clay minerals was found to exchange rapidly with atmospheric water. Conditions under which the interlayer water could be removed from the clays without affecting the isotopic compositions of their ...
Samuel M Savin, Samuel Epstein
openaire   +1 more source

Oxygen and hydrogen isotopic composition of tap waters in France

Geological Society, London, Special Publications, 2021
Abstract The isotopic compositions of oxygen ( δ 18 O) and hydrogen ( δ 2 H) are widely used to locate the geographical origin of biological remains or manufactured products. In this paper, we analyse the distributions of δ 18
Valérie Daux, B. Minster, A. Cauquoin, O. Jossoud, M. Werner, A. Landais   +5 more
openaire   +3 more sources

Normalization of oxygen and hydrogen isotope data

Chemical Geology: Isotope Geoscience section, 1988
To resolve confusion due to expression of isotopic data from different laboratories on non-corresponding scales, oxygen isotope analyses of all substances can be expressed relative to VSMOW or VPDB (Vienna Peedee belemnite) on scales normalized such that the δ18O of SLAP is −55.5% relative to VSMOW.
openaire   +1 more source

Effect of oxygen on solubility of hydrogen isotopes in titanium

Fusion Engineering and Design, 1989
Abstract Solubility measurements of hydrogen and deuterium gases in pure titanium and titanium—oxygen alloys with 10–30 at %O have been performed in the temperature range of 600–850°C at pressures below 100 Pa by a constant-volume method. All the solubility data obeyed Sieverts' law.
Shinsuke Yamanaka, Taku Tanaka, Shinya Tsuboi, Masanobu Miyake   +3 more
openaire   +1 more source

OXYGEN AND HYDROGEN ISOTOPES IN THE HYDROLOGIC CYCLE

Annual Review of Earth and Planetary Sciences, 1996
▪ Abstract  Changes of the isotopic composition of water within the water cycle provide a recognizable signature, relating such water to the different phases of the cycle. The isotope fractionations that accompany the evaporation from the ocean and other surface waters and the reverse process of rain formation account for the most notable changes.
openaire   +1 more source

Organic oxygen and hydrogen isotopes in a porcine controlled dietary study

Rapid Communications in Mass Spectrometry, 2008
Abstract Controlled feeding studies have been useful in assessing the relationship between isotope values from dietary sources and consumer tissues. We report the organic oxygen and hydrogen values of animal tissue from a porcine controlled dietary study.
Tuross, N., Warinner, C., Kirsanow, K., Kester, C.   +3 more
openaire   +3 more sources

The oxygen and hydrogen isotopic composition of the Black Sea

Deep Sea Research Part A. Oceanographic Research Papers, 1991
The oxygen (18O/16O) and hydrogen (D/H) isotopic ratios have been measured at eight stations in the Black Sea and the Sea of Marmara. Analyses revealed that the O and H isotopic characteristics of the deep water were similar [(δ18O = −1.65‰ (σ = 0.27), δD = −14.29‰ (σ = 2.19)] across the entire width.
openaire   +1 more source

Stable Hydrogen and Oxygen Isotopes in the Water Cycle

1979
The isotope ratios D/H and 18O/16Oexhibit relatively large variations in natural waters. In precipitation one observes 1) a gradual decrease of the heavy isotope concentration when going from lower to higher latitudes, l.e., with decreasing temperature (“temperature effect”; see Fig.
openaire   +2 more sources