Wyniki wyszukiwania - BazTech

1

Nieczynne kamieniołomy we wschodniej części synklinorium północnosudeckiego jako źródło informacji o jego rozwoju

Solecki Andrzej

Górnictwo Odkrywkowe

|

2022

|

R. 63, nr 1

39--45

PL

W artykule przedstawiono trzy nieczynne kamieniołomy, w których można obserwować zapis procesów istotnych dla formowania się synklinorium północnosudeckiego. Struktura ta będąca efektem inwersyjnej, laramijskiej deformacji serii osadowo-wulkanicznej basenu postwaryscyjskiego jest stosunkowo uboga w odsłonięcia naturalne, ale dzięki intensywnej, trwającej od średniowiecza, eksploatacji kamieni budowlanych istnieje tu szereg porzuconych kamieniołomów. Zaprezentowano trzy z nich dające wgląd w pierwsze stadia formowania się basenu sedymentacyjnego przy północnym uskoku rowu Świerzawy, wulkanizm ryolitowy czerwonego spągowca - Organów Wielisławskich i efekty laramijskiej inwersji w rejonie Kruczych Skał w pobliżu uskoku Jerzmanic.

EN

The article presents three closed quarries, in which one can observe a record of processes essential for the formation of the North Sudetic Synclinorium. This structure, which is the result of the Laramic inversion of the post-Variscan basin filled with sedimentary and volcanic series, is relatively poor in natural exposures, but thanks to the intense exploitation of building stones, lasting since the Middle Ages, there are a number of abandoned quarries here. Three of them are presented, giving an insight into: the first stage of the formation of the sedimentary basin at the northern fault of the Świerzawa Graben, the volcanism of the Rotliegend - Wielisławka Organs, and the effects of the Laramian inversion in the area of Krucze Skały close the Jerzmanice Fault.

2

Integrated sedimentological and ichnological study of the Coniacian sedimentation in North Sudetic Basin, SW Poland

Leszczyński S.

Geological Quarterly

|

2018

|

Vol. 62, No. 4

767--816

EN

Lithofacies and ichnological features of the Coniacian deposits of the upper part of Żerkowice Member and lowest part of the overlying Czerna Formation in southeastern part of the North Sudetic Synclinorium are described and their sedimentary palaeoenvironment is interpreted. The study confirms a shallow-marine to paralic/paludine palaeoenvironment. Sedimentation of the Żerkowice Member occurred in an upper shoreface environment dominated by waves, tidal currents and wave-generated alongshore currents, with an episodic encroachment of fore shore zone and shoal-water deltas. The interpretation is supported by a high-diversity assemblage of trace fossils with 21 ichnogenera, representing a stressed expression of the Skolithos Ichnofacies dominated by Ophiomorpha nodosa and a proximal expression of the Cruziana Ichnofacies with Thalassinoides and rare specimens of diverse other ichnotaxa. Sedimentation of the Czerna Formation commenced after a stasis, with at least a local hiatus caused by emergence, and proceeded in a laterally and vertically more varied environment, with transgressive coastal lagoons evolving into freshwater lakes and marshes and with a repetitive regressive intrusion of shoreface and shoal-water deltas. The emergence of the area is recorded by coal-bearing deposits with plant-root traces. Local occurrence of the Teredolites Ichnofacies in coal (peat) deposits above the base of the Czerna Formation indicates renewed marine flooding. Continuation of the latter is locally evidenced by a trace-fossil assemblage with 17 ichnogenera, representing proximal expression of the Cruziana Ichnofacies followed by distal expression of the Skolithos Ichnofacies in the overlying transgressive-regressive cyclothems. The palaeoenvironmental changes recorded by the sedimentary succession indicate bathymetric fluctuations and imply considerable shoreline shifts and palaeogeographic changes in the basin. These changes are interpreted as a combined signal of 2nd- and 3rd-order eustatic cycles, modified and partly obliterated by the effects of intrabasinal tectonic forcing and by palaeogeographically controlled variation in sediment supply.

3

Zechstein marine deposits in the Wleń Graben (North Sudetic Synclinorium, SW Poland) : new insights into the palaeogeography of the southern part of the Polish Zechstein Basin

Kowalski A., Durkowski K., Raczyński P.

Annales Societatis Geologorum Poloniae

|

2018

|

Vol. 88, No. 4

321--339

EN

This paper presents the results of sedimentological studies of Zechstein marine deposits occurring in the Wleń Graben, a tectonic unit located in the southeastern part of the North Sudetic Synclinorium (NSS; Western Sudetes, SW Poland). Owing to poor exposure, small thickness, and lack of palaeontological data, the stratigraphy and age of these rocks were determined solely on the basis of analogies with adjacent areas. New findings described here, including faunal remains (remains of bivalves, including Liebea sp.), geopetal structures, clastic fills of halite crystals, moulds and bioturbation, shed new light on the environmental interpretations of the Zechstein in this part of the NSS. It should be assumed that at least two types of deposit may be assigned to the marine Zechstein in the Wleń Graben area, namely sparitic and microsparitic dolomite (PZ3) and the overlying deposits of the heterolithic series (PZt). These deposits were formed during the late Zechstein transgression, when the study area was in the marginal southwesternmost part of a newly formed shallow-marine bay of the Polish Zechstein Basin. In the central part of the present-day Wleń Graben, a shallow-marine bay (lagoon?) was dominated by carbonate sedimentation. A north-dipping mud plain, periodically flooded by a shallow sea, occurred in the southern part of the area. The paper summarises the present state of research on Permian deposits in the Wleń Graben, the first comprehensive lithostratigraphic scheme is suggested, and a new concept of the palaeogeographic evolution of the area in the Early and Late Permian is proposed.

4

Trace fossils from the Lower Muschelkalk of Raciborowice Gorne (North Sudetic Synclinorium, SW Poland) and their palaeoenvironmental interpretation

Chrząstek A.

Acta Geologica Polonica

|

2013

|

Vol. 63, no. 3

315--353

EN

The following trace fossils have been recognised in the Lower Muschelkalk of Raciborowice Gorne (North Sudetic Synclinorium, SW Poland): Archaeonassa fossulata, Balanoglossites triadicus, ?Gastrochaenolites isp., Lockeia isp., Palaeophycus tubularis, Palaeophycus isp., ?Planolites beverleyensis, P. montanus, Planolites isp., ?Protovirgularia isp., Rhizocorallium commune var. auriforme, R. commune var. irregulare, R. jenense, Skolithos linearis, Thalassinoides suevicus and Trypanites weisei. Coprolites and an unidentified trace fossil A are also described. The trace fossils allow the discrimination of five ichnoassociations in the Raciborowice G1) Rhizocorallium- Pholeus, (IA 2) Rhizocorallium-Palaeophycus, (IA 3) Thalassinoides, (IA 4) Trypanites-Balanoglossites and (IA 5) Planolites-Palaeophycus. The Lower Muschelkalk succession was deposited on a shallow carbonate ramp affected by frequent storms. Deposition commenced with sedimentation in a restricted lagoon on the inner ramp with a short episode of sabkha formation. It continued on the middle and outer ramp and then on a skeletal shoal of the outer ramp and in an open basin. Ichnoassociation IA 5 is related to a maximum transgression that commenced with the deposition of the Spiriferina Bed and which probably marked the opening of the Silesian-Moravian Gate. The basin underwent two shallowing episodes, as evidenced by ichnoassociations IA 3-IA 4, resulting in the formation of hardgrounds. Bathymetric changes in the Raciborowice Gorne section correspond well with a general transgressive trend in the Germanic Basin.