The origin of the Ne-E isotope anomaly in chondrites

Details The origin of the Ne-E isotope anomaly in chondrites The origin of the Ne-E isotope anomaly in chondrites

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991geokh.....1768l&link_type=abstract

Geokhimiia (ISSN 0016-7525), Dec. 1991, p. 1768-1778. In Russian.

Physics

1

Carbonaceous Chondrites, Grain Size, Granular Materials, Neon Isotopes, Silicon Carbides, Geochronology, Nuclear Reactions, Phase Transformations

Scientific paper

The origin of C, N, Si isotope anomalies in the carbonaceous SiC phase grains, which are the bearers of the Ne-E(L) and Ne-E(H) neon isotope anomalies in all primitive chondrites, was investigated. It is shown that variations in the C and N isotopes in the carbonaceous phase are caused by high inhomogeneity of the grains containing the Ne-E phase-carriers. These grains contain the relics of the following nuclear processes: (1) the quasi-equilibrium CNO cycle at the stage of H combustion; (2) the 3(He-4) to C-12 conversion reactions; (3) the (alpha, gamma) and (n,p) reactions in C-12 and N-14 nuclei; (4) the s-process at different levels of T and rho(n); and (5) the O-16(O-16, alpha)Si-28 reactions at the red-giant stage. According to the theory of nucleosynthesis, such nuclear reactions proceed at different stages of evolution of second-generation massive stars.

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