Studyuing the rate of leaching of gypsum from the pore space of sandstones

Abstract

In experimental studies rate leaching gypsum from the pore space of the sandstone revealed a zone with higher content of dolomite (due dolomitization calcite in the peripheral region of the block), with minimum values of the gypsum content and maximum - total porosity. It is shown that the leaching process from rock blocks of the coastal zone Kafirnigan River defined by two successive stages: 1) leaching of dolomitization zone (the slowest) and 2) in the field with the background values of dolomite and calcite (fast). The average value coefficient of Ca2+ ions diffusion in the second region ~70% higher than in the first.