Impact-produced glasses in some martian meteorites have trapped significant amounts of the recent martian atmosphere. From literature data, we estimate that โผ9% of the trapped 80 Kr in these meteorites was produced from neutron capture on 79 Br. Estimates of neutron fluences made from 80 Kr and 149
Light elements and their isotopes in SNC meteorites and the Martian atmosphere
โ Scribed by C. T. Pillinger; M. M. Grady; I. P. Wright
- Publisher
- Springer Netherlands
- Year
- 1991
- Tongue
- English
- Weight
- 285 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0038-6308
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โฆ Synopsis
Nitrogen isotopes have played an important part in the acceptance of the hypothesis that SNC meteorites derive from Mars. As a result, these meteorites can be investigated for their carbon, sulphur, and hydrogen systematics with a view to learning something about the environmental conditions on the planet. Important aspects of the role of carbon, present in the forna of carbon dioxide as an atmospheric gas and leading to the formation of carbonates by weathering or hydrothermal activity, can be established. The presence of indigenous organics is an intriguing possibility. A variety of new or emerging techniques which could improve our understanding of SNC meteorites and might be applied to a returned Martian sample are discussed.
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The ratio of positron=electron uxes originating in nuclear reactions in the Earth's Magnetosphere is considered. It is supposed that positrons as well as electrons are mainly produced in the decay of charged pions ยฑ โ ยฑ โ e ยฑ born in nuclear collisions of trapped relativistic inner zone protons and