Cosmogenic and nucleogenic isotopic changes in Mars - Their rates and implications to the evolutionary history of Martian surface

Details Cosmogenic and nucleogenic isotopic changes in Mars - Their rates and implications to the evolutionary history of Martian surface Cosmogenic and nucleogenic isotopic changes in Mars - Their rates and implications to the evolutionary history of Martian surface

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4627l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, p. 4627

Computer Science

3

Mars Surface, Planetary Evolution, Isotopes, Nuclides, Mars Atmosphere, Planetary Composition, Cosmic Rays, Nuclear Reactions

Scientific paper

Calculations are presented of the production rates of several nuclides in the Martian atmosphere and regolith due to nuclear interactions of cosmic ray and radiogenic particles, and their implications to the evolutionary history of Mars are considered. The nuclides selected are those which may be useful as tracers for delineating the past histories of the Martian atmosphere and regolith, and the calculations for different assumed atmospheric pressures are presented. Compared to cosmic ray production rates, the nucleogenic production rates are several orders of magnitude smaller. However, the nucleogenic production extends to much deeper levels, whereas the cosmogenic production is essentially confined to the top 750-1000 g/square cm depth. Important examples of nucleogenic production are discussed. It is shown that, with but limited inferences drawn at present, the planet Mars presents a unique opportunity to use cosmogenic nuclides as tools to delineate the evolutionary history of the planet as a whole, as well as its regolith and atmosphere. As such, neon and argon isotopes appear to be very promising for delineating the relevant processes.

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