On normal fault-type displacements in nappe structures
Abstract
The described displacements belong to a special type of fault tectonics, which occurs in nappe structures and develops in them as a result of movements of the underlying rigid base. Therefore, displacements of this type are of interest as a characteristic example of the manifestation of tectonics in the coal-bearing strata of the Lower Tertiary age. A general idea of the nature of the manifestation of displacements is given by the schematic map of displacements and outcrops of coal seams (Fig. 1) and the geological section (Fig. 2). The coal-bearing strata of the Lower Tertiary age (Fig. 2) lies unconformably on the eroded surface of Mesozoic rocks. It is composed mainly of sandy clayey rocks. The underlying Mesozoic rocks in the area of contact with coal-bearing deposits are represented by weathered conglomeratic and quartz‑feldspar sandstones.
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