Settings for carbon parageneses formation in Late Precambrian

In this work, the authors show that areas of occurrence of Precambrian sedimentary series rich in Organic Matter in many petroleum basins all over the world often coincide with the largest diamond-bearing provinces and ore fields. These natural associations are an aggregate composed of rocks rich in Organic Matter, Organic Matter itself, and its derivatives, diamonds, carbonates, and metal ores are called to be carbon parageneses. Therefore, the problem of identifying the conditions for the formation of these carbon parageneses in the Late Precambrian is highly relevant. The authors present the comprehensive analysis of the Upper Vendian Kocheshorsky Formation (V2kc) in the Efimovsky site being one of the candidates for investigations of Precambrian carbon parageneses. There are lithology and coal petrography phototables, diagrams of carbon isotopic signature and chromatography-mass spectrometry of bitumoids extracted from the discussed deposits are shown in the paper. Based on the results of the authors' analytical studies and overview of numerous works, they made the following assumption: the processes that caused formation of carbon parageneses may be a manifestation of a more global event in the Earth's history, which contributed to formation of large diamond, ore and hydrocarbon accumulations. The presented scheme of formation of such a process is one of the possible consistent models that requires further investigations