Composition and distribution features of microelements in high-carbon Domanic rocks, extracts from rocks and asphaltenes

The article presents the results of comparative studies of the microelement composition of samples of high-carbon carbonate-siliceous rocks from the Semiluki-Mendym (Domanic) deposits of the Romashkino, Pervomaisky and Muslimovsky deposits, which differ in mineral composition, organic matter (OM) content and spatial location in the territory of Tatarstan. The OM content in the rocks varies from 4.19 to 11.73%. The mineral composition of the rocks is represented mainly by quartz and calcite, the content of which varies from 24 to 61% and from 17 to 54%, respectively. Using the method of mass-spectrometry with inductively coupled plasma in the composition of rocks, extracts from rocks, asphaltenes and carben-carboids isolated from them, the presence of three groups of microelements (ME): biogenic, radioactive and rare-earths was established, and also the features of their composition and distribution in the studied objects, depending on the spatial location of the deposits and the material composition of the rocks.