Świerczewska, Anna

Now showing 1 - 6 of 6

Access status: Open Access ,
Department of Fossil Fuels
(Wydawnictwa AGH, 2016) Świerczewska, Anna; Górecki, Wojciech
Access status: Open Access ,
Significance of pressure solution structures analysis for fluid flow studies – examples from Struga-1 well (Zechstein Main Dolomite; W Poland): first results
(Wydawnictwa AGH, 2015) Górka, Joanna; Świerczewska, Anna; Krzyżak, Artur Tadeusz
The internal structure and composition of pressure solution structures are factors that may influence petroleum generation and migration (Hofmann & Leythaeuser 1995).
Access status: Open Access ,
Arsenic in water from the Bystre Thrust-Sheet (Outer Carpathians, Poland): Geological and environmental implications
(Wydawnictwa AGH, 2024) Aleksander-Kwaterczak, Urszula; Andrzejak, Jakub; Świerczewska, Anna; Lukaj, Konrad
Wydział Geologii, Geofizyki i Ochrony Środowiska
The article focuses on the physicochemical parameters of water in streams, springs, boreholes, and intakes from the Bystre Thrust-Sheet (the Silesian Nappe, Fore-Dukla Zone), the only area in the Polish segment of the Outer Carpathians where arsenic minerals occur. These waters are characterized by the presence of arsenic, lithium, mercury, barium, strontium and usually high CO$_{2}$ concentrations. The study aimed to determine the range of the geochemical anomaly of arsenic in water. An important aspect was to determine the origin of As and link its presence with the content of ions of other chemical elements dissolved in water. The sampling points were designated based on geological maps with a particular emphasis on the occurrence of tectonic dislocations and the configuration of the river network. In the selected places 47 samples of water were taken, and various elements were determined. Then, the range of occurrence of various types of water that differed from the average concentrations of selected ions was analysed. The potential relationship between the chemical composition of water and the geology of the Bystre Thrust-Sheet was also discussed. The high concentrations of arsenic were found only in springs and boreholes. In flowing waters, these concentrations quickly decreased as due to dilution or precipitation and binding with the solid phase. Relatively high (max. 378.72μg/L) arsenic concentration, which significantly exceeded the permissible value (50μg/L), was detected in the Bystre 1 borehole. This water has a pH value of 7.85 indicating its alkaline nature. When considering water use for health purposes, it is necessary to monitor its arsenic content. The conditions prevailing in waters, mainly high pH, favour the immobilization of metals in sediments and suspended matter. The lower concentrations of arsenic in flowing waters may be attributed to the strongly calcareous nature of the Cieszyn beds which act as a natural barrier, limiting the migration of arsenic beyond the Bystre Thrust-Sheet.
Access status: Open Access ,
Identification of tectonic microstructures in flysch sandstones of the Outer Carpathians using X-ray nanotomography and nuclear magnetic resonance – first results
(Wydawnictwa AGH, 2015) Radzik, Natalia; Świerczewska, Anna; Krzyżak, Artur Tadeusz
Deformation bands and microfractures occurring in sandstones affect the petrophysical properties of the rock and determine fluid flow.
Access status: Open Access ,
Continuous contractional deformation followed by extension in the Nowy Sącz Basin, Polish Outer Carpathians: constraints from fault-slip analysis
(Wydawnictwa AGH, 2025) Fodor, László; Świerczewska, Anna; Strzelecki, Piotr Jan
Fault-slip analysis was carried out in the Nowy Sącz Basin and the surroundings of the Polish Outer Carpathians based on field observations, published maps, and publications. A reconstruction of the stress field and the contractional directions from the folds suggests that the area was marked by four different deformation phases, most of them involving several stress states. The tilt test supports the separation of pre-, syn-, and post-folding deformation episodes within the phases which occurred during the folding of the Palaeogene to Early Miocene flysch units and also during the folding of the late Middle Miocene basin fill. After an early extensional phase at the onset of the deformation history, the area was marked by contractional deformation from ~34 Ma to ~8 Ma. During this period the compressional direction did not change markedly but a slight clockwise change of the maximal stress axis may have occurred in the Early Miocene due to vertical-axis block rotation. In this persistent deformation field, the basin could have had a contractional origin in front of an out-of-sequence thrust. The latest Miocene(?) to Quaternary deformation was probably related to the extensional collapse of the Carpathian accretionary wedge.
Access status: Open Access ,
Correlation between organic and inorganic indicators of thermal maturity in Dukla Nappe (Polish Outer Carpathians)
(Wydawnictwa AGH, 2014) Waliczek, Marta; Więcław, Dariusz; Świerczewska, Anna
Correlation between organic (vitrinite reflectance (Ro) and Rock-Eval Tmax temperature) and inorganic (mixed layer illite/smectite (I/S)) indicators of thermal maturity depend mainly on the maximum temperature achieved by the rock and the time exposure of this temperature. During sedimentary or tectonic burial of rocks, clay minerals may react diversely to organic matter due to heat flow features and the duration of heating (Aldega et al. 2005). The aim of this study was to correlate maximum paleotemperatures of the Oligocene Menilite Shales from the Polish Outer Carpathians determined based on vitrinite reflectance and Rock-Eval pyrolysis data to those calculated using I/S ratio.

Świerczewska, Anna

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