Nuclear tracks, SM isotopes and neutron capture effects in the Elephant Morraine shergottite

Details Nuclear tracks, SM isotopes and neutron capture effects in the Elephant Morraine shergottite Nuclear tracks, SM isotopes and neutron capture effects in the Elephant Morraine shergottite

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1039r&link_type=abstract

(Lunar and Planetary Institute, NASA, American Geophysical Union, et al., Lunar and Planetary Science Conference, 16th, Houston,

Physics

3

Achondrites, Capture Effect, Meteoritic Composition, Nuclear Particles, Particle Tracks, Samarium Isotopes, Mars (Planet), Neutron Irradiation, Planetary Evolution, Uranium, Meteorites, Stony Meteorites, Achondrites, Samples, Meteorite, Eeta79001, Eet Meteorites, Fission Tracks, Isotopes, Samarium, Neutrons, Capture, Uranium, Concentration, Lithology, Size, Phosphates, Thorium, Regolith, Parent Bodies, Irradiation, Exposure Age

Scientific paper

Nuclear track studies, uranium concentration measurements and Sm-isotope studies have been performed on both lithologies A and B of the Elephant Morraine shergottite, EETA 79001. Track studies show that EETA 79001 was a rather small object in space with a preatmospheric radius of 12 + or - 2 cm, corresponding to a preatmospheric mass of 28 + or - 13 kg. Phosphates have U concentrations ranging from 0.3 to 1.3 ppm. There are occasional phosphates with excess fission tracks, possibly produced from neutron-induced fission of U and Th, during the regolith exposure in the shergottite parent body (SPB). Sm-isotope studies, while not showing any clear-cut excess in Sm-150, make it possible to derive meaningful upper limits to thermal neutron fluences of 2 to 3 x 10 to the 15th n/sq cm, during a possible regolith irradiation. These limits are consistent with the track data and also make it possible to derive an upper limit to the neutron exposure age of EETA 79001 of 55 Myr in the SPB regolith.

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