From the geological point of view, the formation of well salt should have two important conditions: first, river and lake facies, that is, there is a large area of river and lake water in geological age, and river and lake facies is a necessary condition for salt crust deposition; Second, there must be geothermal resources. The existence of hot springs is the medium to form salt springs, and Yanjing Town has the above two important conditions.
Specifically, with the gradual uplift of the Qinghai-Tibet Plateau, the lake water on the plateau is constantly evaporating, and the salt is continuously accumulated and concentrated on the surface, forming a salt shell. After geological changes, the strata are distorted and the salt crust is buried deep underground. With the further fracture and distortion of the stratum, underground hot springs dissolve the salt in the stratum and rush to the ground, which is the principle of well salt formation.
The difference between well salt and sea salt;
From the point of view of nutrition, the main component of salt is sodium, so there is no difference between well salt and sea salt. In terms of quality, the quality of well salt is better and purer than sea salt. Because the raw materials of well salt are all from natural brine and rock salt deposits in Jurassic geological age below a thousand meters deep well, they are rich in various natural mineral elements and have few impurities.
Secondly, the refining principle of well mineral salt is refined by fully sealed vacuum process, which hardly destroys its original substance and is pure natural. Well mineral salt is superior to sea salt in color and shape. Finally, with the development of modern industry, the pollution of harmful chemicals to sea salt raw material-seawater is becoming more and more serious, but the raw material of well salt is not affected.
Reference to the above content: Baidu Encyclopedia-Well Salt