Computer Science
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012gecoa..77..252h&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 77, p. 252-265.
Computer Science
2
Scientific paper
Refractory inclusions in primitive meteorites are the oldest objects formed in the Solar System. They exhibit large mass-dependent isotopic effects in many elements, including Si, Mg and Ca, indicative of their complex origin. We report data for both mass-dependent (δ) and mass-independent (&z.epsiv;) Ca isotopic effects, and rare earth element (REE) abundances in six refractory inclusions from the Allende CV3 meteorite. Our data reveal large mass-dependent Ca isotopic effects in these refractory inclusions, with δ44/40Ca ranging from -5.60 to +0.35 (relative to NIST SRM 915a), which are significantly lower than that of the bulk silicate Earth (δ44/40Ca = 1.05 ± 0.04). Importantly, δ44/40Ca is correlated with REE patterns: refractory inclusions with Group II REE patterns have lighter Ca isotope compositions compared to those with Group I REE patterns. Specifically, the studied refractory inclusions form negative 44Ca/40Ca-Tm/Er and 44Ca/40Ca-Nd/Er trends, implying segregation of up to 3% of an ultrarefractory evaporation residue from a chondritic reservoir prior to the formation of refractory inclusions. This residue would have to be characterized by high 44Ca/40Ca and low Tm/Er and Nd/Er. At 2σ levels of ±0.5 and ±1.5 for &z.epsiv;40/44Ca and &z.epsiv;43/44Ca, respectively, the six refractory inclusions studied show no detectable 40Ca or 43Ca anomalies relative to the terrestrial standards. However, five out of the six refractory inclusions do show a 48Ca excess of several &z.epsiv;-units, clearly resolvable from the terrestrial standards.
Farkaš Juraj
Huang Shichun
Jacobsen Stein B.
Petaev Michail I.
Yu Gang
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