Lithium Isotope Ratios in Meteorites.

Oxygen Isotope Ratios in the Crust of Iron Meteorites

The separation factor, aM-0= ( 1 8 0 / 1 6 0 ) magnetite/' ( 1 8 0 / 1 6 0 ) atmospheric oxygen, between the magnetite crust of iron meteorites and atmospheric oxygen has been determined to be 0.9946 ± 0.0005. It is concluded that this fractionation of the oxygen isotopes is the consequence of an equilibrium isotope effect at high temperatures. It can be assumed that this is also valid for cosm...

Nickel Isotope Anomalies in Meteorites and The

Birck, J. Chen, G. Huss, G. Lugmair, S. Mostefaoui, D. Papanastassiou, A. Shukolyukov, G. Quitté, S. Tachibana, M. Wadhwa. Geological Institute, University of Copenhagen, Copenahgen, Denmark. Laboratoire de Géochimie et Cosmochimie, IPG, Paris, France. JPL, Pasadena, CA 91109-8099, USA. HIGP, University of Hawai’i at Manoa. Scripps Institution of Oceanography, University of California, San Dieg...

Iron Isotope Compositions of Achondritic Meteorites

Electrochemical isotope effect and lithium isotope separation.

A large electrochemical isotopic effect is observed upon the electrodeposition of lithium from solutions of propylene carbonate producing isotopically light metal deposits. The magnitude of fractionation is controlled by the applied overpotential and is largest close to equilibrium. Calculated partition function ratios for tetrahedrally coordinated lithium complexes and metallic lithium predict...

Magnesium isotope ratios in Hyades stars

Using classical model atmospheres and an LTE analysis, Mg isotope ratios Mg:Mg:Mg are measured in 32 Hyades dwarfs covering 4000K ≤ Teff ≤ 5000K. We find no significant trend in any isotope ratio versus Teff and the mean isotope ratio is in excellent agreement with the solar value. We determine stellar parameters and Fe abundances for 56 Hyades dwarfs covering 4000K ≤ Teff ≤ 6200K. For stars wa...