Titanium Isotopic Compositions of Refractory Inclusions from Several Cv3 and Ck3 Chondrites: Implications for Nebular Heterogeneity

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

Titanium isotopic composition of CAIs from the Axtell and Leoville carbonaceous chondrites

The Ti isotopic compositions previously determined for “normal” (i.e., non-FUN) calcium-aluminum-rich inclusions (CAIs) from primitive chondrites display relatively small, but resolvable mass-independent anomalies, most likely of nucleosynthetic origin [1-10]. However, the limited dataset makes it difficult to conclude whether this range of compositions reflects the degree of heterogeneity in t...

Calcium isotopic compositions of chondrites

We report mass-dependent and mass-independent Ca isotopic variations in nine chondrites from three groups: carbonaceous, ordinary and enstatite chondrites. There is about 0.25‰ per amu, i.e., 1‰ in Ca/Ca, variation in chondrites: carbonaceous chondrites have the lightest Ca isotopes, enstatite chondrites have modeled bulk Earth like Ca isotopes, and ordinary chondrites are in between. The corre...

Oxygen Isotopic Compositions of Fayalite in the Kaba Cv3 Carbonaceous Chondrite

INTRODUCTION The Fe-rich olivine end-member, fayalite (Fa100), occurs in the matrix, chondrules, CAIs, silicate aggregates, and dark inclusions in the oxidized Kaba and Mokoia CV3 chondrites, where it is associated with magnetite and troilite. To help constrain the origin of the fayalite, we measured O-isotope compositions of fayalite (Fa98-100) from two petrographic settings of the Kaba meteor...

Calcium isotopic ratios and rare earth element abundances in refractory inclusions from the Allende CV3 chondrite

Refractory inclusions in primitive meteorites are the oldest objects formed in the Solar System. They exhibit large massdependent isotopic effects in many elements, including Si, Mg and Ca, indicative of their complex origin. We report data for both mass-dependent (d) and mass-independent (e) Ca isotopic effects, and rare earth element (REE) abundances in six refractory inclusions from the Alle...