Findings chrome-spinellides diamond association on the northern slope of the Voronezh antecline

Abstract

The article presents data on the indicator minerals of kimberlites of cretaceous sediments of the northern slope of the Voronezh antecline. Aptian deposits in the study area contain a record amount of chrome-spinellides, up to 1784 grains per sample in volume of 20 liters. Chrome-spinellids are characterized by a high content of Cr2O3, about 32 % of the analysed grains in the diagram of N.V. Sobolev fall into the diamond association. The morphological descriptions of chrome-spinellides are expounded, the highlighted grains of "mantle" type are characteristic for kimberlites. The primary source of these minerals is located to the southeast of the study area.