Recent Data on the Isotope–Geochemical Composition of Kimberlites in the TSNIGRI-Arkhangelskaya Pipe, Arkhangelsk Diamondiferous Province (Northern East European Platform)
E. V. Agasheva, L. V. Zyryanova, A. M. Agashev, N. G. Soloshenko, N. P. Pokhilenko
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Abstract
Recent data on the bulk and isotopic (Sr, Nd) composition of kimberlites from the low-diamondiferous TsNIGRI–Arkhangelskaya pipe, located in the Kepino field of the Arkhangelsk diamondiferous province, are presented. It is shown that the kimberlites belong to the moderate titanium type of kimberlites of the province and differ significantly from the previously studied kimberlites of the Kepino field in the lower concentrations of TiO2, Ba, high field strength, and light rare earth elements. Among all the kimberlites of the province, the kimberlites from the TsNIGRI–Arkhangelskaya pipe have the most radiogenic Sr composition (87Sr/86Sr t from 0.7068 to 0.7089), which may be related to a combination of several factors. It has been established that the kimberlites from the pipe are represented by two varieties, having differences both in the concentrations of major and trace elements and in the Sr and Nd isotopic composition. The Nd isotopic composition (εNd from 0 to –0.6) for type-I kimberlites indicates their enriched source in the lithospheric mantle. The type-II kimberlites have a less radiogenic Nd composition (εNd from –3.5 to –4.9), which is interpreted ambiguously: their formation from an even more ancient enriched source inside the lithospheric mantle compared to type-I kimberlites cannot be excluded.
期刊介绍：
Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.
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