Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..73..269w&link_type=abstract
Earth and Planetary Science Letters, Volume 73, Issue 2-4, p. 269-277.
Computer Science
7
Scientific paper
Nd and Sr isotopic compositions in kimberlites from Zaire indicate a time-integrated depleted mantle source (ɛNd = +6 to +2 and 87Sr/86Sr = 0.7040). Slight upper crust contamination is reflected only by the Pb isotopic system. Differences in the isotopic compositions of kimberlites from two kimberlite provinces, Mbuji Mayi and Kundelungu, point to the existence of regional heterogeneities in the subcontinental mantle, with a range comparable to that observed in the suboceanic mantle. This suggests that the deep mantle (asthenosphere) has comparable characteristics under the oceans and under the continents.
Cr-diopside megacrysts, with a more depleted signature (ɛNd = +6.5 and 87Sr/86Sr = 0.7030) than their host kimberlites, could either be xenocrysts derived from a higher level within the mantle and incorporated during the ascent of the kimberlites or, alternatively to an early crystallization stage from a ``proto-kimberlitic magma'' which was subsequently mixed with an enriched mantle component. These data preclude a primary undifferentiated mantle from being the source of these kimberlites.
Demaiffe Daniel
Weis Dominique
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