Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.336..665a&link_type=abstract
Nature (ISSN 0028-0836), vol. 336, Dec. 15, 1988, p. 665-667.
Computer Science
12
Chemical Composition, Crystal Structure, Diamonds, Inclusions, Strontium Isotopes, Abundance, Earth Mantle, Magma, Rare Earth Elements
Scientific paper
Cubic diamonds from Zaire contain fluid inclusions which may record the conditions under which the diamonds formed, either in the mantle or in the kimberlite magma which transported them to the surface. Here, Sr isotope ratios for whole diamonds and abundances of rare-earth elements, K, Rb, Sr, and Ba are presented for both whole cubic diamonds and the leachings from crushed cubic diamonds. The Sr-87/Sr-86 ratios of the diamonds range from 0.7038 to 0.7052, which is almost identical to that of Mbuji Mayi kimberlite. The chondrite-normalized elemental abundance patterns of the diamonds roughly resemble that of kimberlite but show more enrichment in incompatible elements. The bulk of the impurities are soluble in water. These results support the genesis of fluid inclusions in diamond in the kimberlite or in the source of kimberlite magma.
Akagi Tasuku
Masuda Akimasa
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