Carbon isotope fractionation between graphite and diamond during shock experiments
作者： Teruyuki Maruoka , Christian Koeberl , Jun-ichi Matsuda , Yasuhiko Syono
DOI: 10.1111/J.1945-5100.2003.TB00311.X
关键词:
摘要: Carbon isotopic compositions were measured for shock-produced diamond and shocked graphite formed at peak pressures ranging from 37 to 52 GPa. The δ 13 C values of diamonds produced in a sealed container generally lower than that the initial graphite. differences carbon composition between graphite/diamond may reflect kinetic fractionation during oxidation and/or analytical artifacts possibly induced by impurities samples. pressure effect on fractionations can be estimated impurity-free using vented which gases, including oxygen, pore spaces escaped or after formation (e.g., 0.039 ± 0.085‰ GPa). Any shock conversion is too small detected natural shock-induced diamond-graphite systems related terrestrial impact cratering processes.
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