Analysis of refractory inclusions in the Allende and Axtell CV3 chondrites via electron-backscatter diffraction
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Beryllium-boron Systematics of Refractory Inclusions in Cr2 and Cv3 Chondrites: Evidence for Be Heterogeneity
Introduction: Beryllium-10 decays to B with a half-life of 1.4 Ma, and is of interest because it is produced almost exclusively by irradiation reactions, unlike other short-lived radionuclides [1]. Previous studies have shown that the initial Solar System Be/Be ratio was in the range of ~10-10 [2-9], higher than the value expected from the galactic background (~10) [2]. While this live Be in th...
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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...
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Introduction: During a nanomineralogy investigation of the Allende CV3 meteorite, we discovered two new minerals, burnettite (IMA 2013054; CaVAlSiO6) and paqueite (IMA 2013-053; Ca3TiSi2(Al2Ti)O14), in a V-rich, fluffy Type A Ca-Alrich inclusion (CAI) A-WP1 (0.6 × 1 mm in size) in USNM 7617, which was previously studied by Paque and coworkers [1-3]. Electron probe microanalysis (EPMA), scanning...
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Introduction: In recent years, several high-resolution chronometers have been applied towards addressing the important question of the age of the Solar System, which is best estimated from the formation age of the calcium-aluminum-rich inclusions (CAIs), recognized as the earliest-formed solids in the solar nebula. However, there are inconsistencies in the ages of CAIs as determined by differen...
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Calcium Tschermak’s pyroxene (CaTs), CaAlAlSiO6, is well known as an important component in pyroxene. It is a member of the Ca clinopyroxene group in which Al dominates in the M1 site. Pyroxenes with more than 80 mol% CaTs were observed previously in Ca-,Al-rich refractory inclusions (CAI) from five carbonaceous chondrites. This study re-investigated the near end-member CaTs in the Allende and ...
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