Nowe dane o tektonice Pasma Masłowskiego
Abstract
NEW DATA ON THE TECTONICS OF THE MASŁOWSKIE RANGE
Summary
Middle and Upper Cambrian quartzites and shales forming the Masłowskie Range (Holy Cross Mts) are generally monoclinally set. Local foldings resulted from the presence of more competent rock packets consisting mainly of shales and the discontinuities. Transversal faults are mainly of the rotational type. So-called "Świętokrzyski overthrust" presumably represents a set of reverse faults; originally of the steep-like normal type and responsible for downthrusting of northern part of the Holy Cross Mts in relation to the southern in the Paleozoic. There are two systems of joint: sharp-angled and orthogonal, presumably resulting from imposing of stresses (presumably Variscan) on rocks deformed in an earlier (? Caledonian) cycle. Joint fractures of the older cycle are obscure nowadays, being primarily reflected by rectilinear ridges on bedding planes. The ridges originated in result of healing of open fractures. Fractures of the sharp-angled system differ from those of the orthogonal in being often healed with quartz which indicates that they are older than the latter.
Summary
Middle and Upper Cambrian quartzites and shales forming the Masłowskie Range (Holy Cross Mts) are generally monoclinally set. Local foldings resulted from the presence of more competent rock packets consisting mainly of shales and the discontinuities. Transversal faults are mainly of the rotational type. So-called "Świętokrzyski overthrust" presumably represents a set of reverse faults; originally of the steep-like normal type and responsible for downthrusting of northern part of the Holy Cross Mts in relation to the southern in the Paleozoic. There are two systems of joint: sharp-angled and orthogonal, presumably resulting from imposing of stresses (presumably Variscan) on rocks deformed in an earlier (? Caledonian) cycle. Joint fractures of the older cycle are obscure nowadays, being primarily reflected by rectilinear ridges on bedding planes. The ridges originated in result of healing of open fractures. Fractures of the sharp-angled system differ from those of the orthogonal in being often healed with quartz which indicates that they are older than the latter.