Multistage structural evolution of the end-Cretaceous–Cenozoic Wleń Graben (the Sudetes, NE Bohemian Massif) – a contribution to the post-Variscan tectonic history of SW Poland

Kowalski, Aleksander

doi:10.14241/asgp.2020.21

Cited by 6 publications

(13 citation statements)

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“…This 'synclinal' structural characteristics of the Czerwieńczyce Reverse Grabenif correct, being based on surficial geological mapping and involving much extrapolation at depthis, nevertheless, quite symptomatic of a number of Sudetic grabens and to some degree it resembles cross-sections of e.g. the Wleń Graben by Kowalski (2020;Fig. 11) andstill morethat by Gorczyca-Skała (1977, not reproduced here), or of the Upper Nysa -Králiky Graben by e.g.…”

Section: The Intra-sudetic Synclinoriummentioning

confidence: 71%

“…A recent mapping and structural study by Kowalski (2020) of one of the already mentioned second-order synclinal/graben elements branching off from the SE rim of the North Sudetic Synclinorium, the Wleń Graben (Figs. 2 and 7) offers an opportunity to have a closer look on another example of a Late-Cretaceous -Early Palaeogene macro-scale tectonic structure in the NW part of the Sudetes.…”

Section: The North Sudetic Synclinoriummentioning

confidence: 99%

“…Figure 11: Simplified geological map and cross-sections of the Wleń Graben according toKowalski (2020) …”

mentioning

confidence: 99%

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Late Cretaceous – Early Palaeogene inversion-related tectonic structures at the NE margin of the Bohemian Massif (SW Poland and northern Czechia)

Głuszyński

Aleksandrowski

2021

Preprint

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Abstract. A brief, regional-scale review of the Late Cretaceous – Early Palaeogene inversion-related tectonic structures affecting the Sudetes and their foreland at the NE margin of the Bohemian Massif is presented and complemented with results of new seismic studies. The Sudetes expose Variscan-deformed basement, partly overlain by post-orogenic Permo-Mesozoic cover, containing a wide spectrum of tectonic structures, both brittle and ductile, in the past in this area referred to as young Saxonian or Laramide. We have used newly reprocessed legacy seismics to study these structures at the two main post-Variscan structural units of the area, the North-Sudetic and Intra-Sudetic synclinoria, and discuss the results together with regionally-distributed examples coming from quarries and underground mines as well as those from the literature. The Late Cretaceous – Early Palaeogene tectonic structures in consecutively reviewed Sudetic tectonic units, from the north to south, typically include gentle to moderate buckle folds of detachment type or fault-related, high-angle reverse and normal faults, as well as low-angle thrusts – often rooted in the crystalline basement. The structures hitherto described as grabens, are frequently believed to be bounded by reverse faults (hence we use the term ‘reverse grabens’) and typically reveal strongly synclinal pattern of their sedimentary fill. The crystalline basement top, as imaged by seismic sections in the North Sudetic Synclinorium below the detachment-folded cover, is synformally down-warped with a wavelength of up to 30 km, whereas on the elevated areas, where the basement top is exposed at the surface, it is up-warped (i.e. tectonically buckled). The reviewed compressional structures typically show an orientation fitting the regionally-known Late Cretaceous – Early Palaeogene tectonic shortening direction of NE-SW to NNE-SSW The same applies to the regional joint pattern, typically comprising an orthogonal system of steep joints of c. NW-SE and NE-SW strikes. All the reviewed structures are considered as due to the Late Cretaceous – Early Palaeogene tectonic shortening episode, although some of the discussed faults with a strike-slip component of motion may have been modified, or even produced, by later, Late Cenozoic, tectonism.

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Section: The Intra-sudetic Synclinoriummentioning

confidence: 71%

Section: The North Sudetic Synclinoriummentioning

confidence: 99%

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Late Cretaceous – Early Palaeogene inversion-related tectonic structures at the NE margin of the Bohemian Massif (SW Poland and northern Czechia)

Głuszyński

Aleksandrowski

2021

Preprint

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“…Further to the south along the Bóbr valley, an isolated outlier of Cretaceous terrain occurs in a downfaulted position in the vicinity of the town of Wleń, known as the Wleń Graben (Gorczyca-Skała, 1977;Kowalski A., 2020). Its geotouristic significance has not yet been comprehensively investigated, although several localities of interest are known from the area, such as block field on Mount Gniazdo (Migoń & Łętkowska, 2016), landslide-related features in the Bóbr valley (Kowalski A., 2017) and the residual hill of Mount Stromiec in inverted position, with abandoned quarries and fissure caves.…”

Section: Comparison With Other Sandstone Terrains In the Polish Part Of The Sudetesmentioning

confidence: 99%

Not simply volcanoes – The Geoheritage of the Cretaceous System in the Land of the Extinct Volcanoes Geopark, West Sudetes (SW Poland)

Migoń

Pijet-Migoń

2021

geotour

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Volcanic geoheritage is emphasized as the main asset and distinctive characteristic of the Land of Extinct Volcanoes Geopark in the West Sudetes (SW Poland). However, the geoheritage values of the region are not limited to the legacy of ancient volcanism but include various other elements. This paper explores the contribution of geosites that expose sedimentary rocks of Cretaceous age and landforms developed upon these rocks. Six localities from the Geopark area, included in the comprehensive regional inventory of geosites, are presented. They represent natural and man-made sandstone outcrops and show, among others, lithological variations, small- and large-scale post-sedimentary deformation structures, landforms arising from differential weathering (rock shelters, honeycombs), boulder fields and a sandstone xenolith in volcanic rocks. Next, five localities from outside the Geopark, but still within the Pogórze Kaczawskie region, are described. Qualitative and quantitative evaluation of both groups is attempted, and the results show that, in general, geosites within the Geopark rank higher. However at least two from the other group also have significant geotourist potential. Finally, a brief comparative analysis with other parts of the Sudetes, where Cretaceous sedimentary rocks occur, is offered.

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“…2 and 7) offers an opportunity to have a closer look on another example of a Late-Cretaceous -Early Palaeogene macro-scale tectonic structure in the NW part of the Sudetes. TheWleń Graben is a narrow structure, c. 17.5 km long and up to 3.5 km wide, downthrown into the low-grade metamorphics of the Kaczawa Slate Belt, filled with Permian, Triassic and Upper Cretaceous (up to lower Coniacian) mostly sedimentary, shallow marine or continental deposits and "bounded by steep, NW−SE-oriented, normal and reverse faults" (Kowalski, 2020;Fig. 11).…”

Multistage structural evolution of the end-Cretaceous–Cenozoic Wleń Graben (the Sudetes, NE Bohemian Massif) – a contribution to the post-Variscan tectonic history of SW Poland

Cited by 6 publications

References 0 publications

Late Cretaceous – Early Palaeogene inversion-related tectonic structures at the NE margin of the Bohemian Massif (SW Poland and northern Czechia)

Late Cretaceous – Early Palaeogene inversion-related tectonic structures at the NE margin of the Bohemian Massif (SW Poland and northern Czechia)

Not simply volcanoes – The Geoheritage of the Cretaceous System in the Land of the Extinct Volcanoes Geopark, West Sudetes (SW Poland)

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