The Permian Clayey Sediments Genesis by XRF Data on the Reference Section (Volga River, Russia)

Abstract

Background/Objectives: To study provenance and epigenetic transformation of clayey sediments, which were collected during the expedition in the summer of2013. Methods/Statistical analysis: Main method, which used in this work: x-ray fluorescence analysis, which conducted on the spectrometer S2 RANGER (BRUKER). Preparing of sample for analysis included its crushing in mill for 5 minutes to a particle size of about 40-50 μm; compaction with boric acid in a press with a force of 200 kN to get a tablet with a very smooth surface. Findings: For the first time in the present work, by using data of the chemical composition and construction of petrochemical diagrams established: 1) geodynamic settings of sedimentation Tatarian age rocks (passive continental margin); 2) dominant source of demolition – mafic rocks;3) identified epigenetic changes clay rocks (low temperature smectite illitization). The obtained data are consistent with the results of previous researchers. The same conclusions have previous researchers in the results of macro- description of outcrop; description of microsections clayey rocks; electronic microscopy, x-ray structural analysis. It should be noted, that sampling section in the Monastirsky ravine made with a high detail step: totally allocated 360 layers of all five suites, 183 sample were analyzed. Application/Improvements: Analysis of petrochemical diagrams, by using data of chemical composition, proved to be a reliable method of complex reconstruction provenance and geodynamic settings in the study outcrop of Monastirsky ravine.