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In-situ ground gamma spectrometry — an effective tool for geological mapping (the Male Karpaty Mts., Slovakia)

Abstract

This contribution presents the results of profile in-situ gamma spectrometry measurements that sought to determine the content of natural radionuclides 40K, 238U and 232Th in a near surface horizon of rocks, their weathering cover and soils in the area of the Malé Karpaty Mts. It is widely established that the exploration of radioactivity of bedrocks and cover rocks can be a very effective and useful tool for both geological mapping, for identifying deposits of mineral resources, and even addressing the issues of structural and tectonic geology. This assertion is equally confirmed by the ground gamma spectrometry measurements carried out as part of this case study on larger scales, seeking more detailed geological structure solutions. The results obtained provide a welcome addition to an already existing database, which monitors the content of naturally occurring radionuclides individually for every rock lithotype of the Western Carpathians, by elaborating on the data collected by previous research and by updating this database for any future needs. The presented results confirmed the low to medium radioactivity levels of rocks and soils in the studied area. The highest values were detected in granitoids and metamorfic phyllitic rocks of the Malé Karpaty Mts. core; the lowest values were detected in carbonates, arenaceous sediments and, above all, amphibolite bodies. In this way, the presented results of the interpreted profile (P5) confirm the model of local geological structure as represented on the most up-to-date edition of the geological map of the Male Karpaty Mts. (Polak et al. 2011).

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The First International Conference on ‘Processes and Palaeo-Environmental Changes in the Arctic: From Past to Present’ (PalaeoArc)

References Chmal, R., 1990. Detailed geological map of Poland at scale 1:50 000. Poznań sheet . PIG–PIB, Warsaw. Jong, B-J., Löwemark, L. & Chuang, C-K. 2019. Ba/Ca ratios and oxygen isotopic composition of planktonic foraminifera in the Arctic Ocean as a tool for reconstructing paleo-riverine freshwater input. 1 st International Conference ‘Processes and Palaeo-environmental changes in the Arctic: from past to present’ (PalaeoArc). Book of abstracts . Poznań, 66. Karczewski, A., 1976. Morphology and lithology of closed depression area

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Organic-walled dinoflagellate cysts as a tool to recognize carbonate concretions: an example from Oligocene flysch deposits of the Western Carpathians

Organic-walled dinoflagellate cysts as a tool to recognize carbonate concretions: an example from Oligocene flysch deposits of the Western Carpathians

Carbonate concretions found within the Krosno shales (Polish Outer Carpathians) have formerly been interpreted as limestone exotics. Both the concretions and the host shales yield well preserved organic-walled dinoflagellate cysts. The dinoflagellate cyst assemblages provide valuable age-diagnostic information: they indicate a mid-Oligocene age and prove the concretionary origin of the carbonates. Detailed analysis of relative abundance, biodiversity and paleoecology of the dinoflagellates from concretions provides additional information on the sedimentary environment and the model of concretion formation.

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Miocene quartz sands redeposited on subaqueous and alluvial fans during the Saalian: Interpretation of the depositional scenario at Ujście, western Poland

Reinhold, New York, 372 pp. Orton, G.J. & Reading, H.G., 1993. Variability of deltaic processes in terms of sediment supply, with particular emphasis on grain size. Sedimentology 40, 475–512. Passega, R., 1964. Grain size representation by CM patterns as a geological tool. Journal of Sedimentary Petrology 34, 830–847. Pettersson, G., 1997. Unexpected ice movement directions during the last deglaciation in Ujście, NW Poland – Stratigraphical investigations. Quaternary Studies in Poland 14, 85–94. Pisarska-Jamroży, M., 2006. Transitional

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New interpretation of the provenance of crystalline material from Oligocene flysch deposits of the Skole Nappe, Poland: evidence from heavy minerals and clasts in the Nowy Borek section

, Polish Flysch Carpathians). Geological Quarterly 58, 19–30. Salata, D. & Uchman, A., 2012. Heavy minerals from the Oligocene sandstones of the Menilite Formation of the Skole Nappe, SE Poland: a tool for provenance specification. Geological Quarterly 56, 803–820. Salata, D. & Uchman, A., 2013. Conventional and high-resolution heavy mineral analyses applied to flysch sediments: comparative provenance studies of the Ropianka (Upper Cretaceous–Palaeocene) and Menilite (Oligocene) formations (Skole Nappe, Polish Carpathians). Geological Quarterly 57, 649

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Heavy minerals as a tool to reconstruct river activity during the Weichselian glaciation (Toruń Basin, Poland)

). Geochronometria 38, 397-412. Wentworth, C.K., 1922. A scale of grade and class terms for clastic sediments. Journal of Geology 30, 377-392. Westaway, R. & Bridgland, D., 2010. Causes, consequences and chronology of large-magnitude palaeoflows in Middle and Late Pleistocene river systems of northwest Europe. Earth Surface Processes and Landforms 35, 1071-1094. Woronko, B., Rychel, J., Karasiewicz, M.T., Ber, A., Krzywicki, T., Marks, L. & Pochocka-Szwarc, K., 2013. Heavy and light minerals as a tool for reconstruction of

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Tectonic control on the sedimentary record of the central Moldavidian Basin (Eastern Carpathians, Romania)

., Săndulescu M. & Bădescu D. 1996: Balanced cross sections in the Eastern Carpathians (Romania): a tool to quantify Neogene dynamics. In: Roure F., Ellouz N., Shein V.S. & Skvortsov I.I. (Eds.): Geodynamics evolution of sedimentary basins. Editions Technip, Paris, 305-325. Gibson R.G. 2001: Neogene kinematic developments of the East Carpathian bend area, Central Romania. Mar. Petrol. Geol. 18, 149-159. Golonka J., Gahagan L., Krobicki M., Marko F., Oszczypko N. & Slaczka A. 2006: Plate-tectonics evolution and paleogeography of the Circum

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High resolution stratigraphy of the Jurassic-Cretaceous boundary interval in the Gresten Klippenbelt (Austria)

-214. Hardenbol J., Thierry J., Farley M. B., Jacquin T., de Graciansky P. C. & Vail P. R. 1998: Mesozoic and Cenozoic sequence stratigraphy of European basins. SEPM, Spec. Publ. , Tulsa 60, 1998. Hennig S., Weissert H. & Bulot L. 1999: C-isotope stratigraphy, a calibration tool between ammonite- and magnetostratigraphy: the Valanginian-Hauterivian transition. Geol. Carpathica 50, 91-96. Hess H., Ausich W. I., Brett C. E. & Simms M. J. 1999: Fossil crinoids. Cambridge University Press , Cambridge, MA, xv+275

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Influence of liquid-nitrogen freezing of gas-bearing shale rocks on their compressive strength

Abstract

Any definable relation between falling temperature and the compressive strength of shale rocks should provide a useful predictive tool aiding optimization of the results of hydraulic fracturing. In this research, an automeasuring hydraulic press, a thermo-camera and the Fluent ANSYS software were used. The results of laboratory simulations, and the effects of experiments conducted on shale rocks to determine permanent changes in compressive strength, are presented. As both frozen rocks and rocks returned to room temperature show diminished compressive strength. It is suggested that prior freezing of rocks can increase the efficiency of fracturing.

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Gallium and germanium geochemistry during magmatic fractionation and post-magmatic alteration in different types of granitoids: a case study from the Bohemian Massif (Czech Republic)

Abstract

Contents of Ga and Ge in granites, rhyolites, orthogneisses and greisens of different geochemical types from the Bohemian Massif were studied using inductively coupled plasma mass spectrometry analysis of typical whole-rock samples. The contents of both elements generally increase during fractionation of granitic melts: Ga from 16 to 77 ppm and Ge from 1 to 5 ppm. The differences in Ge and Ga contents between strongly peraluminous (S-type) and slightly peraluminous (A-type) granites were negligible. The elemental ratios of Si/1000Ge and Al/1000Ga significantly decreased during magmatic fraction: from ca. 320 to 62 and from 4.6 to 1.2, respectively. During greisenization, Ge is enriched and hosted in newly formed hydrothermal topaz, while Ga is dispersed into fluid. The graph Al/Ga vs. Y/Ho seems to be useful tool for geochemical interpretation of highly evolved granitoids.

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