Abstract
New major- and trace-element compositional data and isotopic analyses of the Mengyin (MY) kimberlites are provided in this paper. Samples were selected to be contamination free and to represent intrinsic features and characteristics of the source. In comparison with the kimberlites of South Africa, MY kimberlites have moderate SiO2 and TiO2; higher Th, U, and Nb; and lower V, Co, Ni, Rb, Sr, and Ba. The characteristics of MY kimberlites are similar to Group IA kimberlites and are distinct from Groups IB and II kimberlites from South Africa. The initial values of 87Sr/86Sr and 143Nd/144Nd are 0.70364 to 0.70421 and 0.51193 to 0.51203, respectively. The ϵNd values of 0.25 to +2.1 are similar to Group I kimberlites, and represent a depleted mantle source that was slightly more enriched than that of Group I South African kimberlites. An Rb-Sr phlogopite age (493 ± 10 Ma) presented in this work represents the emplacement age of the MY kimberlites.
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