What Are Geological Formations?

Geological structure refers to the shape left behind by deformation or displacement of rock layers or bodies under the action of internal and external stress on the earth. It is most prominent in the area where layered rocks are distributed. It also exists in magmatic rocks and metamorphic rocks. Specific manifestations are rock folds, fractures, cleavages, and other planar and linear structures. It has a direct impact on the stability and leakage of the foundations of hydraulic structures. For example, the core of the fold structure has broken rocks and fissures, with low strength and high permeability. Gates, dams, power stations, tunnels, etc. should be avoided as much as possible when selecting such sites. Site selection should also consider the fault conditions in the reservoir area. If large faults extend outside the reservoir area, leakage may occur in the reservoir area. ^[1]

Geological structure refers to the shape left behind by deformation or displacement of rock layers or bodies under the action of internal and external stress on the earth. It is most prominent in the area where layered rocks are distributed. It also exists in magmatic rocks and metamorphic rocks. Specific manifestations are rock folds, fractures, cleavages, and other planar and linear structures. It has a direct impact on the stability and leakage of the foundations of hydraulic structures. For example, the core of the fold structure has broken rocks and fissures, with low strength and high permeability. Gates, dams, power stations, tunnels, etc. should be avoided as much as possible when selecting such sites. Site selection should also consider the fault conditions in the reservoir area. If large faults extend outside the reservoir area, leakage may occur in the reservoir area. ^[1-2]

The so-called geological structure refers to the composition of the crust

Geological structures can therefore be divided according to their generation time

The geostress field under multiple orogenic effects has formed three types of structural types of extrusion type, direct twist type and twist type under the conditions of varying geostresses, interwoven into a complex and variable strain image. Its characteristics are: (1) The geological structure of Guizhou belongs to the intraplate structure, and the main structure is thin-skin structure. (2) The deformation is not very strong. The most complete and extensive structural pattern developed in Guizhou is the Jurassic-type fold belt. Duyun Movement: Named by the Eighth Census Brigade of the In-situ Ministry of Mines (1980), which refers to a crustal movement that occurred in central and southern Guizhou, from the end of the Ordovician to the beginning of the Silurian. The performance of this movement is: in the middle Guizhou area between the Bijie-Zunyi-Meitan-Tongren line and the Guiyang-Shi Bing line, the upper and upper Ordovician, the lower and upper Silurian and lower Ordovician are generally missing. Different horizons are falsely integrated. In many areas, such as near Wudang, Guiyang, conglomerate layers or conglomerate clay rocks at the bottom of the Silurian can be seen embedded in the discontinuous surface with a few meters of undulation.