USKOK STAREGO JULIANOWA W SOWIOGÓRSKIM KOMPLEKSIE GNEJSOWYM I SYTUACJA GEOLOGICZNA W MIEJSCU JEGO WYSTĘPOWANIA (POGÓRZE WAŁBRZYSKIE, SUDETY ŚRODKOWE, POŁUDNIOWA POLSKA)

Abstract

STARY JULIANÓW FAULT IN SOWIE GÓRY GNEISS COMPLEX AND GEOLOGICAL SITUATION IN THE PLACE OF ITS OCCURRENCE (WAŁBRZYCH FOOTHILLS, CENTRAL SUDETES, SOUTHERN POLAND)

Abstract. The paper describes localization and architecture of a uranium-bearing fault, called the Stary Julianów Fault (uStJ). The fault studied occurs in a north-western fragment of the sudetic part of the Góry Sowie Gneiss Massif (MGS ), in the area of the Wałbrzych Foothills, between Stary Julianów and Dziećmorowice. It is one of faults that make up the northern part of a broad dislocation zone extending from Stary Julianów to Zagórze Ślaskie, in which the occurrence of hydrothermal mineralization, called mineralization from Dziećmorowice, was described. Information about the Stary Julianów Fault obtained during its exploration by underground workings to the depth of 345 m and the extension of 900 m, which were made in the years 1949–1952 in connection with uranium ore mining. The Stary Julianów Fault belongs to “older” faults with direction NW –SE and it is oriented crosswise to macrofold which occurs in Julianów region. The architecture of a fault zone of the Stary Julianów Fault consists of two parts: a fault core and a damage zone. The fault core is represented by narrow zone, composed of the fault rocks with the occurrence of uranium-bearing calcite lenses. The damage zone is brittle deformation with instances of carbonate mineralization and hydrothermal alteration of gneisses. It is particularly wide developed in the east side of the Stary Julianów Fault. The architecture and position of the Stary Julianów Fault in the tectonic structure of the region suggests its formation during the Variscan evolution of the Góry Sowie Gneiss Massif.