Chromium Stable Isotope Panorama of Chondrites and Implications for Earth Early Accretion

Stable Chlorine Isotope Reservoirs in Chondrites

Introduction: By analyzing the stable Cl-isotopes of halite from the Zag H-breccia and comparing the results with those from other chondritic materials we can provide new information about isotopes in the early Solar System. In particular Cl-isotope work may complement O-isotope studies. We show for the first time that substantial Cl/Cl fractionation exists between chondrite components. Zag hal...

Magnesium, Titanium and Chromium Isotope Compositions of Refractory Inclusions from Several Cv3 and Ck3 Chondrites: Implications for Nebular Heterogeneity

s-PROCESS IMPLICATIONS FROM OSMIUM ISOTOPE ANOMALIES IN CHONDRITES

Correlated isotopic anomalies in osmium (Os, Os, Os, measured with respect to Os) extracted from primitive carbonaceous chondrites tightly constrain the ratio to be ( 5%). A 190 188 j ( Os)/j ( Os) 0.859 0.042 n n recent measurement of the Maxwellian-averaged neutron-capture cross sections (MACSs) for 186, 187, Os lowered the jn( Os) by 27% but did not measure jn( Os). From the jn( Os)/jn( Os) ...

The Osmium Isotopic Composition of Tagish Lake and Other Chondrites, Implications for Late Terrestrial Planetary Accretion

Introduction: The prevailing models for terrestrial planet origin and differentiation call upon magma oceans generally concurrent with core formation very early during differentiation. Tungsten isotope measurements of Earth and Mars materials are consistent with core formation occurring in terrestrial planets within 30 m.y. or less after the onset of condensation of the solar system [1-4]. In s...

Silver Isotope Fractionation in Chondrites

I n t r o d u c t i o n : The study of Ag isotopic compositions is of particular interest because of the extinct radionuclide Pd, which decays to Ag with a half-life of 6.5 Myrs. This chronometer has been successfully applied to unravel formation and differentiation processes of iron meteorites [1-3]. Compared to the early measurements by TIMS, the use of multi-collector inductively coupled pla...