Noble gases in the diamond-free ureilite, ALHA 78019 - The roles of shock and nebular processes

Details Noble gases in the diamond-free ureilite, ALHA 78019 - The roles of shock and nebular processes Noble gases in the diamond-free ureilite, ALHA 78019 - The roles of shock and nebular processes

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..633w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, April 1986, p. 633-642.

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Meteoritic Composition, Nebulae, Rare Gases, Shock Waves, Stony Meteorites, Ureilites, Carbon, Chemical Composition, Diamonds, Mass Spectroscopy, Meteorites, Rare Gases, Ureilites, Alha78019, Allan Hills Meteorites, Antarctic Meteorites, Shock Effects, Achondrites, Argon, Xenon, Neon, Samples, Meteorite, Kenna, Carbon, Enrichment, Isotopes, Comparisons, Diamond, Chronology, Origin, Solar Nebula, Experiments, Procedure

Scientific paper

Primordial noble gases were measured in the unshocked ureilite ALHA 78019 and in the moderately shocked ureilite Kenna. Much of the gas (>25%) in 78019 is contained in fine-grained, amorphous carbon, where it is enriched 60-fold relative to that in the more abundant crystalline graphite. Isotopically, the gas in the gas-rich C resembles the planetary component ("phase Q") in chondrites, but it is not lost upon etching with HNO3 and hence is not surface sited, unlike the chondritic gas. In most other respects, the noble gases are in the normal range for ureilites. These results suggest that the gases - and carbon - predate the shock event that produced the diamond, hence the gas-rich C in 78019 appears to be a good candidate for the hypothetical pre-shock, noble-gas-bearing C in diamondiferous ureilites. Furthermore, the results suggest that the shock event has no bearing on the origin of carbon in these meteorites.

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