Ming-Chang Liu (UCLA), Jan. 24, 2007 Geocheminar

"Magnesium and oxygen isotopic compositions in CM hibonite: Implications for chronology and solar nebula heterogeneity".

Abstract: Meteoritic hibonite grains preserve a variety of isotopic anomalies that could potentially serve as a tracer to study the early solar system and its surrounding astrophysical environment in different aspects, such as chronologies, irradiation processes and nucleosynthesis. In this talk, I will review some of the literature data and present the recent studies on CM hibonite, with emphasis on Mg and O isotopes, by secondary ion mass spectrometry to discuss the chronology and the astrophysical meanings.