APPROBATION OF SNOW AND ATMOGEOCHEMICAL SURVEYS FOR MAPPING DISPERSION HALOES OF BURIED POLYMETALLIC MINERALIZATION ON THE EXAMPLE OF THE TURUNTAEVSKY ORE OCCURRENCE (TOMSK REGION)

Abstract

The relevance of the study is related to the need to introduce new methods of deep geochemical mapping into the practice of forecasting and prospecting. Purpose: to identify and evaluate the features of the anomalous geochemical field above the overburdened lead-zinc mineralization based on snow and atmogeochemical sampling. Methods: geochemical mapping, mathematical processing of the results of geochemical work, modeling of geochemical fields using multivariate statistics, geological and genetic interpretation of geochemical data. Object: geochemical halos of the Turuntaevsky lead-zinc ore occurrence. Results. As a result of the processing of geochemical data, it was found that most of the chemical elements in the snow cover and soil air are characterized by a low degree of heterogeneity in the distribution of contents, which indicates the absence of contrasting geochemical halos in the area. After mathematical processing of geochemical data, it was found that the most contrasting anomalies of the main ore elements Pb+Zn, As, Sn and Cu and their normalized contents are located above the wells that exposed ore mineralization. According to the results of snow testing in the distribution of all ore elements: Pb+Zn, As, Sn and Cu, false anomalies are also distinguished, located within the development of forest vegetation. The data obtained give grounds to assert that it is not possible to accurately determine the superimposed halos in the snow cover from changes in the concentrations of trace elements. However, the results of correlation and regression analyzes indicate the presence of relationships between elements with similar geochemical properties. Most likely, in this case, the components are differentiated according to the main forms of occurrence: dissolved and undissolved. A number of elements exhibit a relationship with both liquid and solid phases. The presence of significant interrelations of trace elements with markers of undissolved (rare-earth elements) and dissolved (Na+Cl) occurrence forms makes it possible to use indicator ratios to detect weakly manifested superimposed halos in the snow cover.

Keywords

• polymetals
• turuntaevsky ore occurrence
• geochemical anomalies
• snow and atmogeochemical surveys
• mathematical statistics