The Zadnie Kamienne "ravenous" shear zone (High-Tatric Nappe) -- conditions of deformation

Authors

  • Edyta Jurewicz Faculty of Geology, University of Warsaw, Al. Zwirki i Wigury 93, PL-02-089 Warszawa, Poland
  • Ewa Słaby Faculty of Geology, University of Warsaw, Al. Zwirki i Wigury 93, PL-02-089 Warszawa, Poland

Keywords:

Tatra Mts., Carpathians, shear zone, pressure solution, feldspar growth, geothermometers

Abstract

The Zadnie Kamienne shear zone is a high-angle Riedel type shear zone (R'), exhibiting an antithetic sense of displacement, which may have developed synchronously with the nappe-thrusting of the Giewont Unit (High-Tatric Nappe). The amount of displacement along this zone is very low and does not explain the very intense deformation, which is of the same character as that at the base of the Giewont Unit (mylonitization, stylolitization and vein forming). The explanation of this phenomenon lies in the multiple activity of this zone, the change of the direction of movement and the important role of pressure solution in hydrothermal conditions responsible for dissolution creep, mass loss and stress relaxation. This kind of shear can be referred to as a "ravenous" shear zone. Neo-forming minerals accompanying these processes were applied as a temperature gauge. Simultaneous growth of albite and adularia indicates a temperature of about 350°C. Chlorites accompanying them occur in two thermal episodes, the first of which indicating a similar temperature (292-357°C).

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Published

2010-03-27

Issue

Vol. 48 No. 4 (2004)

Section

Articles

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