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Wpływ więźby skały na mechanizm deformacji : studium przypadku wstęg deformacyjnych w piaskowcach otryckich (Bieszczady)

Strzelecki Piotr Jan, Świerczewska Anna

Przegląd Geologiczny

2023

Vol. 71, nr 4

231--234

Compaction is one of the fundamental modes of strain localization. Pure compaction bands are deformation structures that develop in granular rocks. The Otryt sandstone, a flysch sandstone, hosts naturally formed pure compaction bands that originated due to tectonic shortening. The pure compaction bands formed when the host rock was poorly indurated. The deformation bands are of the disaggregation or cataclastic type, with cataclasis occurring more frequently in coarser-grained sandstones. Additionally, in laminated fine-grained sandstones, disaggregation takes the form of micro-folding. Textural features of the host rock appear to control the microstructural type of pure compaction band.

Wykorzystanie rentgenowskiej mikrotomografii komputerowej i cyfrowej analizy obrazu do petrologicznej charakterystyki skał węglanowych

Strzelecki Piotr Jan, Fheed Adam, Radzik Natalia, Świerczewska Anna

Przegląd Geologiczny

2019

Vol. 67, nr 3

195--197

The paper briefly describes a possible application of X-ray computed microtomography studies followed by digital image analysis, enabling petrological assessment of carbonate rocks. The contribution presents an example of a complex, qualitative and quantitative approach aiming at deriving shape, geometry and spatial orientation of rock components as applied for a carbonate reservoir rock sample from the Zechstein Limestone (Ca1) strata. Apart from the basic properties of the analyzed objects, such as volume, surface area and number, detailed shape descriptors were obtained (compactness, sphericity, elongation, flatness, spareness). The presented approach allows for obtaining detailed 3D results at the microscopic scale, enabling extensive characterization of the studied material geometry. The methods proposed could be applied for other rock types as well.