Helium and carbon isotopes in Indian diamonds

Details Helium and carbon isotopes in Indian diamonds Helium and carbon isotopes in Indian diamonds

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2587w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Sept. 1990, p. 2587-2591.

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Carbon Isotopes, Diamonds, Helium Isotopes, Alpha Particles, Cosmic Rays, India, Infrared Spectroscopy, Mass Spectroscopy, Mineralogy, Radioactive Decay

Scientific paper

Helium and carbon isotope measurements in Indian diamonds (from Andhra Pradesh) were carried out using samples that included mined diamonds from primary kimberlite source rocks and alluvial diamonds from river gravel. The He and C isotope concentrations in diamonds from these two sources were compared, and the Indian diamonds were compared to those from other regions. Results indicate that most of the He-3 in the alluvial diamonds is of cosmogenic origin and that the alluvial diamonds may also have a significant He-4 component due to alpha particles implanted during storage in a secondary matrix. One diamond, a mined kimberlite specimen, was found to have the lowest He-4 content (0.018 microcc/g) so far recorded in diamonds.

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