Neon in gas-rich samples of the carbonaceous chondrites Mokoia, Murchison, and Cold Bokkeveld

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Carbonaceous Chondrites, Meteoritic Composition, Neon Isotopes, Solar Wind, Astronomical Models, Chromites, Cosmic Dust, Solar System, Statistical Correlation

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The history of the early solar system, especially the solar wind, is analyzed by observing neon concentrations in gas-rich carbonaceous chondrites. A model is developed in which the early solar system consisted of two components, one in the gas phase and the other trapped in dust grains. Neon ratios 20Ne/22Ne = 13.7 are comparable to those observed today, and provide information on galactic cosmic ray spallation. Mechanisms for the combination of the gas and neon phases in the chondrites, e.g., gravitational collection, ion implantation, adsorption, are investigated, and it is suggested that the total amount of neon in the solar system is a function of accretion of gas-rich trace phases, together with neon from cosmic ray spallation and the solar wind.

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