The role of primary nonuniformity of mountain massifs in the reconstruction of tectonic stresses according to geological indicators

摘要

Features of the distribution of planes with traces of tectonic dislocations on gliding planes are examined, and the local stress conditions are restored on them, according to O.I. Gushchenko's method [1979]. Most of the tectonic stresses were determined in the rock-crystal-bearing area of the Pripolyarnii Ural in the rocks of the Proterosoic and Lower Ordovician age. The rock crystal was of Late Permian age. The distributions of the planes with gliding trails depend on the primary anisotropy of the rocks and on the type of stress condition. The specific type of stress condition named variation was marked out. The variation of the type of the stress condition (VSCT) is strictly confined to rock crystal pockets. The already existing planes of nonuniformity in the rocks, which often do not coincide with shear planes, are used in case of a deformation in the last tectonic stress fields. The criteria for distinguishing tectonic stress classes, based on the models of the distribution of tectonic stresses in the surroundings of faults, are suggested.