BERYLLIUM-BORON SYSTEMATICS OF Al-POOR CAIs: IMPLICATIONS FOR THE RELATIONSHIP BETWEEN FUN AND NON-FUN CAIs

Beryllium - boron systematics of two distinctive CAIs from CV 3 chondrites : the relatively pristine CAI B 4 from NWA 6991 and the FUN CAI CMS - 1 from

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...

U - Th - Pb AND Rb - Sr SYSTEMATICS OF ALLENDE FUN CAI CMS -

Introduction: Among the calcium-aluminum-rich inclusions (CAIs) there exists a small subgroup referred to as FUN CAIs (for Fractionation and Unidentified Nuclear effects [1]) that exhibit unusually large mass-dependent fractionations and mass-independent isotopic variations [1-3]. Understanding the origin, conditions of formation, genetic relationship of these inclusions with other CAIs and the...

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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...