Nitrogen in diamond‐free ureilite Allan Hills 78019: Clues to the origin of diamond in ureilites
作者： V. K. Rai , S. V. S. Murty , U. Ott
DOI: 10.1111/J.1945-5100.2002.TB00876.X
关键词:
摘要: Nitrogen and noble gases were measured in a bulk sample acid-resistant carbon-rich residues of the ureilite Allan Hills (ALH) 78019 which has experienced low shock is free diamond. A small amount amorphous carbon combusting at ≤500 °C carries most gases, while major phase consisting large crystals graphite combusts ≥800 °C, almost noble-gas free. on other hand present both graphite, with different δ15N signatures -21‰ +19‰, respectively, distinctly from very light nitrogen (about -100‰) Amorphous ALH behaves similar to Q chondrites respect gas release pattern, behavior towards oxidizing acids as well isotopic composition. In situ conversion or diamond through would require an fractionation 8 12% for favoring isotope, unlikely proposition, posing severe problem widely accepted origin
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