ANOMALOUS GEOCHEMICAL FIELD OF THE CHERTOVO KORYTO GOLD DEPOSIT (LENSKY ORE DISTRICT)

Abstract

The relevance of the study is caused by the need to improve the efficiency of forecasting and prospecting for ore gold based on geochemical data. The aim of the research is to develop a model of the anomalous structure of the geochemical field of the Chertovo Koryto deposit in order to identify additional predictive and search criteria for gold ore objects in carbon-carbonate-terrigenous strata. Methods: statistical processing of geochemical data, geochemical modeling. Object: the primary geochemical aureole of the Chertovo Koryto gold deposit. Results. Statistical parameters of distribution of metals in a large-scale metasomatic aureole indicate intense hydrothermal-metasomatic processes, expressed, primarily, in deposition of highly concentrated solutions containing Au, As, Ag, Pb. Based on the processing of geochemical data on primary dispersion halos, a model of the geochemical zonality of the Chertovo Koryto gold deposit was created. The authors have established concentric-zonal composition of the anomalous structure of the deposit geochemical field. The early Ba-Be-Zr-Ti-Y association of elements leached and redeveloped during acid metasomatism (a quartz-rutile-pyrite-pyrrhotite complex) borders the periphery of the mineralized zone. In the intermediate zone of the metasomatic halo, the Cr-Ni-Co-Mn-V-Sn-P-(As) geochemical association is common, due to the formation of the quartz-pyrite-arsenopyrite-pyrrhotite complex completing the beresitization. The deposition of the Au-As association occurred at later time, with the formation of arsenopyrite in the composition of quartz-pyrite-arsenopyrite with the gold mineral complex. The latest association of the Au-Ag-Pb-Zn-Сu polymetallic with gold ore formation stage (gold, galena, sphalerite, chalcopyrite) is confined to the central part of metasomatically modified rocks. The complex of methods for processing geochemical information together with the use of the data of mineralogical and geochemical mapping provided the interpretation of the anomalous structure of the deposit geochemical field. The results obtained made it possible to supplement the existing understanding of the anomalous structure of the geochemical field of the Chertovo Koryto gold deposit.

Keywords

• gold
• lensky ore district
• anomalous structure of the geochemical field
• geochemical zonality
• mathematical statistics