Nitrogen and light noble gases in Shergotty

Details Nitrogen and light noble gases in Shergotty Nitrogen and light noble gases in Shergotty

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..993b&link_type=abstract

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

Mathematics

Logic

7

Achondrites, Light Elements, Meteoritic Composition, Nitrogen Isotopes, Rare Gases, Abundance, Argon Isotopes, Galactic Cosmic Rays, Mineralogy, Radiogenic Materials, Spallation, Meteorites, Stony Meteorites, Achondrites, Shergotty, Samples, Meteorite, Nitrogen, Rare Gases, Antarctic Meteorites, Eet Meteorites, Eeta79001, Spallation, Cosmic Rays, Irradiation, Exposure Age, Shielding, Argon, Radiogenic Material, Homogeneity, Mineralogy, Outgassing, Shock Effects, Laboratory Studies, Procedure, Parent Bodies,

Scientific paper

Two samples of Shergotty and a sample of EETA 79001's lithology A have been analyzed for N, He, Ne, and Ar abundances and isotopic composition. After correcting for spallogenic nitrogen, the nitrogen isotopic ratios were found to be close to that of the terrestrial atmosphere. The spallogenic noble gas data are consistent with cosmic ray irradiation of both Shergotty and EETA 79001 at shallow shielding depths. Cosmic ray exposure ages were estimated to be in the range of 0.5-0.8 Myr for EETA 79001, and of 2.0-5.2 Myr for Shergotty, depending on the choice of object size and shielding. Among the two Shergotty samples, the contents of Ar-40 differed by a factor of 3. This difference can be attributed to either a small-scale mineralogical inhomogeneity or a significant variation in the degree of degassing of minerals during shock, although the presence of trapped argon with a high Ar-40/Ar-36 ratio and its heterogeneous distribution cannot be ruled out.

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