Mantle derived helium with R/RA ratios up to 1, which accompanies CO2 exhalations and cold C02-rich carbonated waters, has been found to escape through the 40 km thick continental lithosphere in the Outer Carpathians. Revised 4He/20Ne ratios of mantle and crust (6818 and 2.53 x 107, respectively) allow the estimation of the respective contribution of mantle, crust and air-derived helium to the bulk helium. Although isotopic ratios of noble gases attest to a mixing process which takes place between crust and mantle gases, carbon isotope ratios of the CO2 (813C of -8.9 to -1.8 per mil) do not correlate with helium isotope ratios (R/RA), indicating complex processes of CO2 derivation. The R/RA ratios in methane-dominated gases are similar to those in C02-rich gases, designating similar mode of helium supply. The C02/311e ratios are up to 2 orders of magnitude higher than the secular C02/3He ratio of mantle gas emanations at ocean ridges. It suggests that the recycled crustal carbon rather than mantle carbon is the principal source of C02. The fluids of interest with their noble gases and other isotopic signatures and high concentrations of dissolved carbonates are similar to hydrothermal solutions observed in active marginal basins.
UNiAs 2 band structure has been calculated based on two full-potential methods: full potential linearized augmented plane wave implemented in WIEN2k code and full-potential local-orbital minimum-basis in FPLO code. Starting from the local (spin) density approximation (L(S)DA) we verified either the orbital polarization correction or the LSDA+U approach with the Coulomb repulsion energies U of 0-4 eV for the uranium 5f electrons. Calculated magnetic moments confirm antiferromagnetic ground state and collinear magnetic sequence. The best agreement with experimental results has been achieved by applying orbital polarization corrections, the magnetic moment on uranium amounts to 1.76 µ B per U atom.
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