Pseudotachylit – tektonika i impakt

Pseudotachylite is produced both during tectonic activity as well as by impact of a large celestial body. Special conditions of its petrogenesis and characteristics of host rocks determine the variability of pseudotachylite. This variability creates difficulties in its identification and classification as well as in determining the ways of its formation. The variable classifications require comparisons with other tectonic and impact rocks. The few non-obligatory characteristics of matrix and clasts differentiate tectonic and impact pseudotachylite. Both tectonic and impact activities create the final form of astrobleme. The rock was characterized on the basis of materials from Vredefort, Ries, Siljan, Dellen and some glacial erratics from Lower Silesia, SW Poland.