Geochemical Comparison of Kimberlites from the Siberian and East European Platforms: Problems of Genesis and Spatial Zoning

摘要

Kimberlites from two Russian provinces, the East European (EEP) and Siberian (SP) platforms, were compared in terms of their trace-element composition and the ages of emplacement and mantle enrichment (Nd-model ages). Previous comparisons were focused on geological, geomorphological, and mineralogical data [1], whereas our works are mainly underlain by isotope-geochemical studies, which provide insight into key problems of kimberlite petrology. In order to exclude methodical errors, kimberlites were analyzed in several known laboratories (Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry; Institute of Precambrian Geology and Geochronology and the Geological Institute of the Russian Academy of Sciences; and the Institute of Mineralogy, Geochemistry, and Crystal Chemistry of Rare Elements) using a common scheme described in [2].