Geochemical characteristics of paragenetic elements in colmated soils: the case of Ca and Sr

Abstract

This article analyzes the formation and geochemical characteristics of paragenetic elements in colmated soils, using Ca and Sr as examples. Paragenetic elements represent a group of elements that migrate and accumulate in geochemical association with each other during soil formation or occur within the same mineral-geochemical environment. The study examines the ionic and chemical properties of Ca and Sr, their distribution within the soil profile, concentration clarks, Clark distribution, and radial migration. Available data on soils formed in the Sokh, Isfayram, and Shohimardonsoy areas of the Fergana Valley were analyzed. The results showed considerable variation in Ca content among the studied areas, with Ca concentrations ranging from 6700 to 7650 mg/kg in the Sokh area. A negative correlation was identified between Ca and Sr: the correlation coefficient was r = -0.32 for average contents, r = -0.26 for concentration clarks, and r = -0.550 for radial migration. These findings indicate that Ca and Sr in colmated soils undergo interconnected, but not unidirectional, geochemical migration processes.