Evaporite formations are among the main rock types for the formation of karst landforms. The Maroon plain is located in the simply folded Zagros belt in the provinces of Khuzestan and Kohgiluyeh and Boyer-Ahmad. The Kalat mountain basin in the Capet-Dag zone hosts many limestone sinkholes due to the presence of carbonate formations. This study aimed to determine the dissolution rate of gypsum by estimating the dissolution rates of cations and anions dissolved in samples of rainwater and runoff flowing on the Gachsaran formation. An attempt was also made to reveal the differences and similarities in this area in terms of dissolution rate of limestone formations. For this purpose, the rainwater samples, as well as others from runoff at different sites, and collected at different times in a 6.2 hectares sub-basin in the Maroon plain following eight hours of monitoring, were analyzed. The amount of salts from the dissolution of gypsum and other ions in runoff revealed an average of removal of 6.6 tons of gypsum rock per year, removed as solution by runoff in a 6.2-hectare sub-basin. Moreover, it takes 71 years to form a sinkhole with a volume of 376.4 m3. The dissolution rate of gypsum per 100 years is 23 cm, in contrast with the dissolution rate of limestone estimated to be 0.236 cm per 100 years from previous studies. Thus, the dissolution rate of gypsum calculated appears to be almost 100 times that of limestone.