Trace Element Abundances of Ninety Refractory Inclusions in the Allende Meteorite

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...

Trace Element Abundances in an Unusual Hibonite-perovskite Refractory Inclusion from Allende

AN in-situ TRACE ELEMENT STUDY OF REFRACTORY FORSTERITES FROM DIFFERENT TYPES OF UNEQUILIBRATED CHONDRITES

Introduction: Refactory forsterites are widespread components of all types of unequilibated chondrites. They occur in concentrations up to 0.3 vol.% and are extremly poor in Fe, Ni, Co and Mn and are rich in refractory lithophile elements (Ca, Al, Ti, Sc, V, REEs) [1,2]. A further characteristic of refractory forsterites ist that they are often significantly enriched in O [3]. In order to trace...

Rare Earth Element Abundances in Refractory Inclusions from Y-81020 (co3.0) Chondrite: Evidence of Ree Fractionation under Variable Conditions

Introduction: In the course of the systematic study on refractory inclusions in the Ningqiang meteorite [1], ion microprobe analyses of rare earth elements (REEs) have been performed and correlated positive anomalies in Ce (+Eu) +Yb have been found in some inclusions [2, 3]. Two different patterns are recognized: one is HREE-depleted patterns with positive anomalies in Ce +Eu +Yb (named as modi...

Barium and Neodymium Isotopic Anomalies in the Allende Meteorite

Isotopic anomalies have been found for Ba and Nd in two inclusions from the Allende meteorite. These inclusions are typical Ca-Al-rich objects associated with early condensates from the solar nebula but have distinctive O and Mg isotopic anomalies of the FUN type. Sample Cl shows a depletion only in Ba of 2 parts in 10 and normal Nd. Sample EK1-4-1 shows large positive excesses in the unshielde...