SEDIMENTARY FACIES AND GENETIC ANALYSIS OF THE EOGENE SALINE FORMATION, DINGYUAN, ANHUI
Lu Yanbang Wang Dong Zhou Haiyuan
The salt-bearing series of the Dingyuan Formation is of the Eogene fluvial and lacustrine facies deposit, which is dominated by saline and fresh-water lake facies. The saline sediments, occuring in a sub-depression, are controlled by a large fault beside them. The only one occurrence of salt-bearing bed in a huge thickness shows a well-developed rhythm classified into IV, V and VI grades. The saline minerals are only halite, glauberite and anhydrite, with the absence of potassium-magnesium sulfate and chlorite, The halilith has very low contents of potassium (0. 01-0. 02%), magnesium (0. 03- 0. 06%) and bromine (0. 001-0. 002%) , with a small bromine-chloine coefficient, typical of terrestri- al facies saline lake deposition of early-stage halite.