Struktury koliste i pierścieniowe na zdjęciach satelitarnych – ich geneza i znaczenie

Abstract

CIRCULAR AND RING-LIKE STRUCTURES IN SATELLITE PHOTOS - THEIR ORIGIN AND SIGNIFICANCE Summary Besides photolineaments, circular and ring-like structures varying in diameter may be traced in satellite photos. The origin of such circular structures is the subject of discussion but there appears that they are most often related to circular volcano-tectonic structures and igneous intrusions of the central type. In our country, especially high concentration of circular structures is found in the Sudety Mts and their foreland. Over a dozen structures circular to elliptical in outline were traced in Landsat satellite of that area. The authors regard two of these structures (Jawor and Świdnica) as analogues to volcano-tectonic depressions and eight others (Strzegom, Stanowice, Środa Śląska, Strzelin, Jaszów ,Złoty Stok and Paczków-Jeseniki) as presumably related to intrusions of the central type. The available data are, however, insufficient for unequivocal interpretation of origin of several other structures. The known deposits and accurrences of various colour metals were found to be most common in places of concentration of photolineaments and at cross-sections of photolineaments and circular structures, e.g. in the vicinities of Jawor and at cross-section of 4 circular structures in the Stronie Śląskie area.