Microfabric diversity and grain shape analysis of fault rocks from the selected areas of the Western Tatra Mountains

Kania, M.

doi:10.7306/gq.1129

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Tytuł artykułu

Microfabric diversity and grain shape analysis of fault rocks from the selected areas of the Western Tatra Mountains

Autorzy

Kania M.

Treść / Zawartość

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Kania_M_Microfabric_Geol. Quart_Vol.58_No 1_2013.pdf

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DOI

10.7306/gq.1129

Warianty tytułu

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Abstrakty

Fault rocks in brittle and brittle-ductile shear zones played a key role in the evolution of the Western Tatra Mountains crystal- line rocks (Poland-Slovakia). Microfabrics of these rocks, including grain shape analyses, were investigated in the six areas of the Western Tatra Mountains. Based on studies of thin sections, 14 types of fault rock microfabric are distinguished, ac- cording to the following criteria: (a) the presence and abundance levels of a cataclastic matrix and (b) the presence and form of a preferred orientation features. General tendencies observed in these areas indicate southwards increasing non-coaxial deformation as well as the domination of ultracataclasites or ultramylonites to phyllonites in areas with negative relief (e.g., sedlo Zabrat’ Pass, Dziurawa Przełęcz Pass). A model of shear zone evo l u tion embracl ng foll owl ng three stages is pro- posed: (1) deformation partitioning and block-controlled cataclastic flow, (2) matrix-controlled cataclastic flow, (3) selective leaching and deposition of silica, leading to the formation of softened and hardened deformation domains respectively. These microstructural observations were supported by statistical analyses of the grain shape indicators (compactness, isometry, ellipticity, solidity, convexity). Two trends of relationships between compactness and convexity were noted: the first, horizontal on the correlation diagrams, was interpreted as an effect of rapid cataclasis and then sericitization, the sec- ond, with a strongly negative correlation coefficient, was considered as an effect of long-term cataclastic flow. The different microfabric data and microstructural interpretations described in this paper are consistent with a new model of the tectonic history of the Western Tatra Mountains evolution, with an important role for a non-coaxial deformation during Alpine orogeny in brittle and brittle-ductile conditions.

Słowa kluczowe

microfabrics grain shape analysis fault rocks shear zones Western Carpathians Western Tatra Mountains

Wydawca

Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy

Czasopismo

Geological Quarterly

Rocznik

2014

Tom

Vol. 58, No. 1

Strony

3--18

Opis fizyczny

Bibliogr. 65 poz., rys., wykr.

Twórcy

autor

Kania M.

maciej.kania@uj.edu.pl

Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków, Poland

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