Nitrogen isotopes in the solar system

Details Nitrogen isotopes in the solar system Nitrogen isotopes in the solar system

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..529g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Apr. 1982, p. 529-548. Research supported by the Swiss National Science Foundation.

Mathematics

40

Abundance, Interplanetary Medium, Nitrogen Isotopes, Solar Corpuscular Radiation, Solar System, Fractionation, Lunar Soil, Particle Production, Planetary Atmospheres, Regolith, Solar Activity, Solar Atmosphere, Solar Wind, Spallation, Nitrogen 15, Isotopes, Solar System, Abundance, Composition, Solar Wind, Moon, Soils, Breccias, Isotopic Ratios, Comparisons, Spallation, Depth, Intensity, Regolith, Accretion, Mixing, Surface, Source, Origin, Data, Experiments, Observations, Planets, Meteorites, Earth, Enrich

Scientific paper

The isotopic composition of nitrogen in the solar system is measured, and it is shown that the 30% change during the last 3-4 billion years of N-15/N-14 in solar-wind-bearing lunar soils and breccias probably does not reflect changes in the ratio at the solar surface. It is argued that accretion of interstellar matter does not work as a cause for a significant change of the photospheric N-15/N-14 ratio, giving evidence that the mixing depth at the solar surface on a time scale of not less than one billion years is 0.01 to 0.1 solar mass. A quantitative treatment of several alternatives of solar accretion leads to serious contradictions, and it is proposed that a rare, very light nitrogen component, LNP, is admixed to planetary matter, which, combined with isotope fractionation, can in principle account for the variability of N-15/N-14.

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