Carbon isotope fractionation between graphite and diamond during shock experiments

Details Carbon isotope fractionation between graphite and diamond during shock experiments Carbon isotope fractionation between graphite and diamond during shock experiments

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003m%26ps...38.1255m&link_type=abstract

Meteoritics &Planetary Science, vol. 38, no. 8, p.1255-1262

Computer Science

2

Scientific paper

Carbon isotopic compositions were measured for shock-produced diamond and shocked graphite formed at peak pressures ranging from 37 to 52 GPa. The 13C values of diamonds produced in a sealed container were generally lower than that of the initial graphite. The differences in the carbon isotopic composition between initial graphite and shocked graphite/diamond may reflect kinetic isotopic fractionation during the oxidation of the graphite/diamond and/or analytical artifacts possibly induced by impurities in the samples. The pressure effect on the isotopic fractionations between graphite and diamond can be estimated from the 13C values of impurity-free diamonds produced using a vented container from which gases, including oxygen, in pore spaces escaped during or after the diamond formation (e.g., 0.039 ± 0.085 at a peak pressure of 52 GPa). Any isotopic fractionation induced by shock conversion of graphite to diamond is too small to be detected in natural shock-induced diamond-graphite systems related to terrestrial impact cratering processes.

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