Corrosion analysis of carbonate rocks in southern Jiangsu Province

The objective of this work was to understand the karst development potential of carbonate strata in southern Jiangsu，and provide quantitative data for relevant research. Some representative rock samples were collected and made into test specimens of uniform specifications，which were prepared to a hydrological year dissolution test. The results show that，（1） The average dissolution rate of the carbonate rock in this area is about 1.42 mm/ka，which is at a low level compared with other areas in China，roughly equivalent to 1/30 of that of southwestern China mainland and slightly higher than that of the karst areas in northern China.（2） The experiment proves that the Permian and Triassic carbonate rocks in southern Jiangsu Province have the strongest dissolution，which provides a geological basis for explaining the karst phenomenon in the above-mentioned stratigraphic zones. （3）The dissolution of rock is closely related to Ca content，which is affected by the mineral composition and micro-structure of the rock. Generally，high-Ca carbonate rock has high dissolubility.（4） Two key factors determining the development of karst are rock dissolution and hydrodynamic condition.The Yixing area meets both conditions，so karst developed well.