Some fabric elements of fault-related and sheared rocks

Abstract

Wybrane elementy budowy wewnętrznej gnejsów i skał kataklastycznych The paper describes some elements of the internal structure of sheared gneisses and cataclastic rocks at different stages of recrystallization. Presented are net, augen, and helicoidal structures. The net structures evidence extension deformation of the rock predating slip deformation. The augen and helicoidal structures are typical of rocks related to faults. Catablastic augen structures establish time relations concerning the phenomena of crushing and recrystallization. Helicoidal structures constitute a structural indicator of recurrent shear deformation.