Solar-type Ne in Zaire cubic diamonds

Details Solar-type Ne in Zaire cubic diamonds Solar-type Ne in Zaire cubic diamonds

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52...19o&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 1, pp.19-25

Computer Science

9

Scientific paper

Elemental abundances and isotopic compositions of noble gases have been measured in five cubic diamonds from Zaire. 20 Ne/ 22 Ne ratios range from 11.5 to 13.5 and 21 / 22 Ne from 0.047 to 0.074. We interpret these data to indicate that neon in the diamonds is a mixture of atmospheric neon and "diamond" neon, the latter consisting of solar-type neon trapped from the mantle source and nucleogenic neon produced by 18 O ( , n ) 21 Ne and 24 Mg ( n , ) 21 Ne reactions in the diamonds. Measured 3 He/ 4 He ratios range from 4.2 to 13.0 × 10 -6 , while 38 Ar / 36 Ar = 0.187 ± 0.005 and is identical with atmospheric argon. Kr and Xe isotopic compositions are indistinguishable from air, except for slight excesses in 129 Xe and fissiogenic Xe isotopes. The noble gas elemental abundance pattern in the diamonds shows a systematic fractionation trend, with the heavier noble gases being enriched relative to air.

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