METAL-SILICATE SEGREGATION AND FRACTIONATION OF Ge ISOTOPES: COMPARISON OF EXPERIMENTAL DATA AND METEORITES
نویسنده
چکیده
SEGREGATION AND FRACTIONATION OF Ge ISOTOPES: COMPARISON OF EXPERIMENTAL DATA AND METEORITES. B. Luais, M.J. Toplis, L. Tissandier, and M. Roskosz. C.R.P.G., CNRS, Nancy-Université, 15, rue Notre-Dame des Pauvres, B.P.20, 54501 Vandoeuvre-les-Nancy, [email protected], D.T.P. , 14 avenue Edouard Belin, Toulouse, 31400, France, LSPES, Université de Lille1, Bâtiment C6, Villeneuve d'Ascq, 59655, France
منابع مشابه
Age and Origin of Iab Iron Meteorites and Their Silicate Inclusions Inferred from Hf/w
The decay of Hf (half life of 9 million years) to W provides a powerful tool to date metal-silicate fractionation in the early solar system. During segregation of metal the siderophile W partitions into the metal phase, whereas the lithophile Hf is preferably incorporated by silicate phases. The formation of iron meteorites during metal-silicate fractionation may have occured during condensatio...
متن کاملLive 107Pd in the Early Solar System and Implications for Planetary Evolution
We present a report on the status of 107Pd (>r = 9.4 x 106 y) in the early solar system and the implications of its presence for protoplanet evolution. Over the last two decades we have carried out an extensive search for the evidence of presently extinct 107Pd in meteorites. From these results we conclude that: 1) 107 Ag* (excess 107 Ag) is present in a wide variety of iron and stony-iron mete...
متن کاملPrecise measurement of chromium isotopes by MC-ICPMS.
We report novel analytical procedures allowing for the concurrent determination of the stable and mass-independent Cr isotopic composition of silicate materials by multiple collector inductively coupled mass spectrometry (MC-ICPMS). In particular, we focus on improved precision of the measurement of the neutron-rich isotope 54Cr. Because nitride and oxide interferences are a major obstacle to p...
متن کاملAbyssal peridotites reveal the near-chondritic Fe isotopic composition of the Earth
Terrestrial oceanic and continental basalts are enriched by approximately þ0.1% in Fe/Fe ratio relative to primitive, undifferentiated meteorites (chondrites). The dFe values of terrestrial basalts are also distinct from those of basalts from Mars and asteroid Vesta, which have chondritic Fe isotopic compositions. The processes responsible for the isotopic enrichment of terrestrial basalts are ...
متن کاملGains from diversification on convex combinations: A majorization and stochastic dominance approach
By incorporating both majorization theory and stochastic dominance theory, this paper presents a general theory and a unifying framework for determining the diversification preferences of risk-averse investors and conditions under which they would unanimously judge a particular asset to be superior. In particular, we develop a theory for comparing the preferences of different convex combination...
متن کامل