Computer Science
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86...57k&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 86, no. 1, Nov. 1987, p. 57-68.
Computer Science
22
Biotite, Diamonds, Helium Isotopes, Single Crystals, Cosmic Rays, High Temperature, Solar Corona
Scientific paper
The possible relationships between diamond mineralogy and helium isotopes were investigated by measuring the distribution and isotopic composition of He in a suite of well-characterized one-carat diamonds from the Orapa kimberlite, Botswana. The results of crushing in vacuo experiments indicated that most of He was contained in the matrix, rather than in the inclusions of the diamonds. Step-heating of individual diamonds at 2000 C released He of He-3/He-4 ratios that differed by up to a factor of 100 among the two heating steps, revealing large isotopic variations within individual diamonds. It is suggested that this internal isotopic variability is the result of stepwise graphitization: the first heating step initiates graphitization which nucleates around defects in a diamond, and the second step graphitizes the relatively defect-free regions of the diamond. This explanation predicts that the highest He-3/He-4 ratios should be found in most perfect crystals.
Gurney John J.
Jenkins William J.
Kurz Mark D.
Lott Dempsey E. III
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