Isotopic ratios of oxygen

The 5 0 and 5D values for smectites are presented in tables 1 and 2. Isotopic ratios of oxygen and hydrogen are reported relative to SMO V standard. 

The provenance of marble is one such case. Early attempts at provenance using trace elements found that trace element concentrations varied by factors of over 100 within the same quarry. However, the stable isotopic ratios of oxygen and carbon have been used to discriminate between marble sources. These isotopic ratios are fractionated during initial formation of the protolith. For example, the will vary... 

The measurement of oxygen diffusion is usually made by the use of as die labelling isotope. If a gas containing an initial concentration C, of in O , and Co is the initial conceiiuation of in a right cylinder oxide sample of thickness 21, and a is the ratio of oxygen atoms in the original gas phase compared widi that in the solid, dieii after a time t, when the concentration in the gas phase is C/... 

Marino, B.D. and DeNiro, M.J. 1987 Isotopic analysis of archaeobotanicals to reconstruct past climates Effects of activities associated with food preparation on carbon, hydrogen and oxygen isotope ratios of plant cellulose. Journal of Archaeological Science 14 537-548. 

Sharp, Z.D. 1990 A laser-based microanalytical method for the in situ determination of oxygen isotope ratios of silicates and oxides. Geochimica et Cosmochimica Acta 54 1353-1357. 

Matsuhisa, Y. and Utada, M. (1993) Hydrothermal activity responsible for the Kuroko mineralization inferred from oxygen isotopic ratios of altered rocks from the western area of the Hokuroku district, northern Japan. Bull. Geol. Surv. Japan, 44 (213/4), 155-168 (in Japanese). 

Shikazono, N. (1988a) Oxygen and carbon isotopic ratios of calcite and evolution of hydrothermal activities in the Seigoshi gold-silver mining district, Japan. Mining Geology Special Issue, 12, 1-16. 

They found that the order for the M—0 stretching modes (M—0 force constants) was (02)Pd(02) > Pd(Oj) and (02)Ni(02) > Ni(02), and since the 0-0 force constant increased as the M-0 force constant decreased, reversibility could not be equated with shorter 0—0 bond length. To test the proposed isosceles model they predicted the various absorptions that would be expected on the basis of the symmetrical structure (a) and unsymmetrical structure (c), Fig. 8. If the isotopic ratio of 0 0 is 1 1, then three bands would be expected for structure (a), with relative intensities 1 2 1, and four bands would be expected for structure (c), with relative intensities 1 1 1 1, the two oxygen atoms now being in different environments. These workers 189) then obtained the IR spectrum for the cocondensation product from the reaction between nickel and O2 (4.2—10°K), in isotopic ratio 0 =1 1, and found three bands with relative inten-... 

Smith, A. W. (1978), Stable carbon and oxygen isotope ratios of malachite from the patina of ancient bronze objects, Archaeometry 20, 123-133. 

Proceedings of the National Academy of Sciences Figure 1. Deuterium isotope ratio vs. oxygen isotope ratio for world-wide precipitation (IAEA data), showing the slope of eight (31). 

The reality of the large peak at 37.4 years might be questioned because 37.4 years is a large fraction of 72 years, however it appeared in the Fourier transform of the oxygen isotope ratios of the modern part of the same Sequoia (1749-1975 A.D.) at 33.4 years so we believe it to be real. Furthermore we cut the data sequence from 72 years to 63 years and made its Fourier transform, and found that the 37 year signal remained unaffected, indicating that it is not an artifact of a half harmonic of 72 years. 

The linear relationship of the isotope ratios of hydrogen and oxygen with a slope of 8 in rain and snow was discovered by Craig [74] to be... 

The information contained in the glacier archive is manifold. The composition of the water molecules (stable isotope ratio of hydrogen H/ H and oxygen 0/ 0) is often used as a paleo thermometer, for example [4]. In addition, the ice contains... 

Oxygen isotope ratio analysis provides a powerful tool for the study of water/rock interaction. The geochemical effect of such an interaction between water and rock or mineral is a shift of the oxygen isotope ratios of the rock and/or the water away from their initial values, given that their compositions are not in equilibrium. 

DeNiro MJ, Epstein S (1979) Relationship between the oxygen isotope ratios of terrestrial plant cellulose, carbon dioxide and water. Science 204 51-53 DeNiro MJ, Epstein S (1981) Isotopic composition of cellulose from aquatic organisms. Geochim Cosmochim Acta 45 1885-1894... 

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