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Kaczawa Klippen Belt – Geotouristic Attraction in the Sudety Mountains, SW Poland

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Kaczawa Klippen Belt – Geotouristic Attraction in the Sudety Mountains, SW Poland Acta Geoturistica volume 9 (2018), number 1, 30-35 doi: 10.1515/agta-2018-0004 Kaczawa Klippen Belt – geotouristic attraction in the Sudety Mountains, SW Poland * JAN GOLONKA , MARIA BARMUTA AND JAN BARMUTA Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Mickiewicza 30, 30-059, Krakow, Poland (*corresponding author e-mail: [email protected]) ABSTRACT In the paper authors present some geological sites from Kaczawa Unit, Sudetes, Poland, and their interpretation in a geotectonic context. All described geosites are important for understanding the evolution of so called Kaczawa Accretionary Prism as well as whole Sudetes. Presented outcrops are easily accessible, well exposed and exhibits high education value. Special attention was given to the Wojcieszów Limestones and their relationship to the surrounding rocks Keywords: geoturism, geotectonic, Sudetes, Kaczawa Unit, olistolith. INTRODUCTION AND OBJECTIVES special attention given to the Wojcieszów Limestones. Noticeable increase of different geoturistic initiatives have been recently recognized in Poland. Few geoparks and GEOLOGICAL SETTINGS geoeducational centers have been already established and some more are in the Geographically, the Kaczawa Unit is project phase. Numerous geological sites located in the south western part of Poland. have been described and prepared for Geologically, it belongs to the Western tourism and numerous publications an Sudetes and occupies most external, geoturistic maps are available. However, it northeastern part of the Bohemian Massif. has been noticed that not enough attention From the south - west the Kaczawa Unit is is given to processes which are responsible bordered by the Karkonosze Massif, which for rock formation. Also an information is consider as a eastern part of the about geotectonical environment in which Saxothuringian Terrane. The stratigraphic given rock had been formed are usually not profile of the Kaczawa Unit comprises two presented in proper and understandable distinct parts. The lower one of Cambrian way. It is stipulated, that besides the ability to Lower Carboniferous age is interpreted how to recognize different rocks or as a accretionary prism formed during the minerals, it is also, or even more important, final stage of the Variscian orogeny, while to understand the geotectonic position of a the upper part is represented by Upper given rock. It is believed, that such a Carboniferous and Lower Permian knowledge will help in understanding the postorogenic sediments (Aleksandrowski et whole earth as a one system. al., 2002). In this paper authors would like to focus The lower part of the Kaczawa Succesion on the lower part of the Kaczawa Unit starts probably from the Gackowa lithostratigraphic profile and present some Sandstone of tentative age of deposition. valuable outcrops with geotectonical Based on recent investigations, both Late interpretation in the context of the plate Proterozoic or Early Paleozoic ages are tectonic theory and Wilson Cycle, with equally probable (Kryza at al., 2008a). © 2018 Jan Golonka, Maria Barmuta, Jan Barmuta. This is an open access article licensed under the Creative 30 Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/). Acta Geoturistica volume 9 (2018), number 1, 30-35 Those sandstones, known from several lavas of Silurian age are present. They are outcrops near Wojcieszów, are immature covered by black Devonian siliceous shales, and exhibits typical shallow water while Lower Carboniferous is build of structures like hummocky cross melanges and flysch like sediments stratification. The Cambrian period is resembling culm facies. represented by pillow lavas and volcano- sedimentary succession. The Wojcieszów Limestone of Middle Cambrian age GEOTURISTIC SITES intercalated by metavolcanoclastic rocks are interpreted as a shallow water reefal The Okole Hill is famous for Cambrian limestone (Lorenc, 1983). The pillow lavas which can be found on the Radzimowice Slates exhibits characteristic summit of the Okole Hill as well as on the features of turbiditc currents deposits. northern and south-western slopes of the Previously they were interpreted as a trench hill. The pillow structures sometimes are fill (Baranowski, 1988), but recently not fully preserved due to the metamorphic considered as a deep water sequence processes, however usually well visible. deposited in the extensional settings (Kryza The Wojcieszów Limestone oucrop in the et al., 2008b). The Ordovician part of the narrow, west – east trending belt from litostratigraphic profile of the Kaczawa Podgórki to Mysłów. Those limestones are Unit consists different kind of usually mapped as a different size bodies, metavolcanoclastic deposits and mixed, ranging from kilometres to meters, which acidic and mafic volcanic rocks (e.g. occurre between slates or schists of Lower Lubrza Trachytes) (Kryza at al., 2008a) . Palaeozoic age, mainly Radzimowice Slates Above them slightly metamorphosed pillow (Fig. 1). Fig. 1 Simplified geological map of the Kaczawa Uni (after Białek et al., 2007, with changes). 1 – limestones and metasedimentary rocks, 2 – chaotic complexes (melanges), 3 – Radzimowice Slates, 4 – metasedimentary and metavolcanic rocks (undivided), 5 – metabasalts, 6 – Wojcieszów Limestones, 7 - metavolcanic and metasedimentary rocks of the Bolków Unit, 8 – sedimentary rocks of the Intrasudetic Basin, 9 – Karkonosze granite, 10 – mica schists and gneisses The most spectacular and outcrop of the Wojcieszów Limestone is located in the 31 Acta Geoturistica volume 9 (2018), number 1, 30-35 abandoned quarry in Wojcieszów in the Wojcieszów Limestone was also excavated southern slope of the Bielec Hill. In the (Fig. 3), as well as in other outcrops near western part of the outcrop Mysłów. As a more resistant to erosion the a non-sedimentary contact between bodies of Wojcieszów Limestone form crystalline limestones and Radzimowice a characteristic klippens in the landscape Slates can be directly observed. The locally obscured by the vegetation. character of the contact suggest that the The picturesque Lipa Gorge is located in body of the Wojcieszów Limestone forms a Rzeszówek – Jakuszowa Unit in the large scale olistolith between Radzimowice northern part of the Kaczawa Unit. It is one Slate (Fig. 2). Similar observation can be of several gorges located in this unit. On the made in the western part of the Podgórki both sides of the gorge slightly village, where smaller block of the metamorphosed Silurian - Devonian Fig. 2 The Gruszka Quarry. A – generall view on the north wall of the quarry, B – nonsedimenatry contact between Wojcieszów Limestone and Radzimowice Slates (marked with dashed red line) 32 Acta Geoturistica volume 9 (2018), number 1, 30-35 Fig. 3 Medium sized olistolith of the Wojcieszów Limestone. Abandoned quarry in the western part of the Podgórki village. Fig. 4 Silurian – Devonian pillow lavas of the Lipa Gorge. 33 Acta Geoturistica volume 9 (2018), number 1, 30-35 MORB basalts with characteristic and well represents the early oceanic crust of the preserved pillow structures can be observed Rheic Ocean, while Wojcieszów Limestone (Fig. 4). and Radzimowice Slates are interpreted as The outcrop of Lower Carboniferous a sedimentary fill of the basin. According to culm-like facies and chaotic complex can the published information (Lorenc, 1983) be found in the Rzeszówek village. In the the Wojcieszów Limestones were deposited central part of the village in the right bank in the shallow- to very shallow water of the stream a black and brown, environment, however in the great distance intensively fractured shales are visible. In from the coast, which may suggest the upper part of the stream, in the northern a volcanic ridge settings. The Radzimowice part of the village, bellow the black shales Slates, as mentioned before, exhibits the so called “Rzeszówek Melanges” features characteristic for turbidites, thus complex is clearly visible. This complex is may be interpreted as deep-water composed of deformed fragments of sediments. The emplacement of different differentiated rocks (e. g. limestones, size fragments of the Wojcieszów sandstones) within a shally matrix. Limestone within Radzimowice Slates should be connected with submarine mass movements like slides or slumps, which are INTERPRETATION IN THE typically considered as processes CONTEXT OF PLATE TECTONICS responsible for olistolith formation (Fig. 5). AND WILSON CYCLE The Ordovician bimodal volcanic sequence exhibits typical for early rift stage (Kryza at The lowermost part of the Kaczawa Unit al., 2008a). The Silurian - Devonian is interpreted as a typical sequence of early MORB basalts of the Lipa Gorge represents rifting stage, which led to the open of the remnants of the back arc ocean which had Rheic Ocean (Kryza et al., 2008a). The opened during closure of the Rheic Ocean pillow basalts found in the Okole Hill and are interpreted as a equivalent of the Fig. 5 Schematic model of Gackowa Sandstone, Wojcieszów Limestone and Radzimowice Slates sedimentation during Cambrian – Ordovician period. 34 Acta Geoturistica volume 9 (2018), number 1, 30-35 Intrasudetic Ophiolite. The stage of REFERENCES Variscian accretionary prism building is represented by the “Rzeszówek Melanges”. Aleksandrowski, P. and Mazur, S. (2002) Collage tectonics in the northeasternmost part of the Variscan Belt: the Sudetes, Bohemian Massif. Geological Society of London, Special CONCLUSION Publication,
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