Wyniki wyszukiwania - BazTech

1

Cadomian protolith ages of exotic mega blocks from Bugaj and Andrychów (Western outer Carpathians, Poland) and their palaeogeographic significance

Burda Jolanta, Woskowicz-Ślęzak Beata, Klötzli Urs, Gawęda Aleksandra

Geochronometria

|

2019

|

Vol. 46, no. 1

25--36

EN

This study presents the first zircon U-Pb LA-MC-ICP-MS ages and whole-rock Rb/Sr and Sm/Nd data from exotic blocks (Bugaj and Andrychów) from the Western Outer Carpathians (WOC) flysch. The CL images of the zircon crystals from both samples reveal typical magmatic textures characterized by a well-defined concentric and oscillatory growth zoning. A concordia age 580.1 ± 6.0 Ma of the zircons from the Bugaj sample is considered to represent the crystallization age of this granite. The zircon crystals from the Andrychów orthogneiss yield an age of 542 ± 21 Ma, interpreted as the uppermost Proterozoic, magmatic crystallization age of the granitoid protholith. The initial (at ca. 580 Ma) 87Sr/86Sr ratios of the Bugaj granitoids (0.72997 and 0.72874) are highly radiogenic, pointing to the assimilation of an older, possibly strongly Rb enriched source to the Bugaj melt. The Nd isotope systematics (εNd580 –1.4 and 0.4) also point to a significant contribution of such a distinct mantle source. On the basis of the sequence of magmatic events obtained from U-Pb zircon ages, we suggest that exotic mega blocks deposited to the WOC basins were related to the Brunovistulicum Terrane. They belong to the group of Vendian/Cambrian granitoids representing the latest, posttectonic expression of the Cadomian cycle.

2

Fossils from the Silesian-Subsilesian series of the Polish Western Carpathians : the implications for changes in sea-level and the marine environment during the Albian-Turonian

Szydło A., Jugowiec-Nazarkiewicz M., Olszewska M.

Geological Quarterly

|

2015

|

Vol. 59, No. 1

215--228

EN

Fossils and exotics from the Albian-Cenomanian deposits of the Western Polish Carpathians are discussed in relation with changes in depositional environments. Environmental conditions were controlled by geotectonic activity, sea-level changes and also anoxic and biotic events. During the Albian-the Early Cenomanian, and in the Turonian the fall in sea level led to increased supply of coarse-grained material rich in siliceous and sometimes calcareous bioclasts and exotics. This cyclic process has contributed to changes in the marine biota. In the Albian monogenic foraminiferal assemblages with the surficial epifauna corresponding to the organic influx and oxygen deficiency (OAE 1b) were evolved into more variable associations including deep infauna, which indicated more aerobic conditions. Under these conditions also preserved planktonic and calcareous benthic fossils, which indicated the supply of terrigenous material from shallow-water environments and land. During the Albian-Turonian transition intensive subsidence and volcanic activity associated with eustatic sea-level rise led to intensive production of phytoplankton. The sea-surface productivity and enhanced upwelling resulted in expanded short-term oxygen minima at the end of the Albian (OAE 1d) and the Cenomanian (OAE 2). In the latter interval benthic forms almost extinct while siliceous and calcareous plankton survived. In the Turonian changes in sea-level and sedimentary regime led to recolonization of the basin bottom.

3

K-Ar dating of bentonite diagenesis in accretionary-wedge turbidites : case study from Western Outer Carpathians

Świerczewska A., Paul Z., Banaś M., Tokarski A. K.

Annales Societatis Geologorum Poloniae

|

2015

|

Vol. 85, No. 1

177--185

EN

Sixteen bentonite layers of Eocene–Oligocene age were sampled at thirteen sites in accretionary-wedge turbidite sequences, in the three innermost nappes of the Western Outer Carpathians. K-Ar dating was carried out for five of these layers to obtain the maximum burial ages. All of the ages obtained are older than the stratigraphic ages of the host strata. This relationship is due to significant contamination of the bentonites with non-authigenic minerals. This contamination resulted from rapid sedimentation during synsedimentary folding, which is a common feature in accretionary wedges. It follows that the K-Ar dating of bentonite layers in the turbidite sequences of accretionary wedges should be largely restricted to the very distal facies of turbidites or to pelitic intercalations within the turbidites.

4

Budowa petrograficzna lądowej materii organicznej we fliszu Karpat Zachodnich w Polsce

Zielińska M.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

|

2010

|

T. 36, z. 4

567-584

PL

Przedmiotem niniejszego opracowania jest budowa petrograficzna uwęglonej lądowej materii organicznej w skałach fliszu Karpat Zachodnich. W trakcie analizy petrograficznej materię organiczną podzielono na odmiany, mając na uwadze rozmiar szczątków organicznych. Materia organiczna reprezentowana jest przez DOM (Dispersed Organic Matter) i uwęglony detrytus roślinny. Ustalono, że zarówno DOM, jak i detrytus nie występują w skałach grubookruchowych, takich jak piaskowce gruboziarniste i zlepieńce. We wszystkich próbkach zawierających materiał węglowy dominuje grupa witrynitu, stanowiąca od 70% do 100% materii organicznej, przy udziale grupy inertynitu w zakresie od 0 do 30%. W trakcie badań próbek w świetle ultrafioletowym w żadnej nie stwierdzono macerałów grupy liptynitu. Największy udział w próbce całkowitego węgla organicznego TOC (ang. Total Organic Carbon) od 1.09% do 8.2%, wykazały warstwy krośnieńskie, grybowskie, formacja szczawnicka, beloweska i wierzowska. Wartości średniej refleksyjności witrynitu w poszczególnych jednostkach są do siebie zbliżone, choć w obrębie jednostek są silnie zróżnicowane i wyniosły odpowiednio: 0.39-0.62% w jednostce śląskiej, 0.38-0.71% w jednostce magurskiej i 0.42-0.67% w jednostce grybowskiej. Najwyższe wartości odnotowano w oknie tektonicznym Mszany Dolnej (0.67%) oraz w południowych partiach jednostki magurskiej (0.65-0.71%).

EN

The objective of this study was a petrographic analysis of terrestrial organic matter in the Western Flysch Carpathians. During the petrographic analysis, organic matter was divided with respect to the size of organic remains into two types. Organic matter is represented by the acronym DOM (Dispersed Organic Matter) and coalified detritus. It was found that both DOM and detritus do not occur in coarse grained rocks, such as coarse sandstones and conglomerates. Vitrinite is the dominant component in all samples, it constitutes 70% to 100% of the organic matter content, whereas the inertinite group makes up the remaining 0% to 30%. No exinite group macerals were detected during fluorescence microscope analysis. Krosno beds, Grybów beds, Szczawnicka, Beloveza and Verovice formation revealed the greatest contribution of TOC (Total Organic Carbon) in the sample, which was from 1.09% to 8.2%. The random mean vitrinite reflectance values in the individual units are similar and vary from 0.39 to 0.62% in the Silesian unit, 0.38% to 0.71% in the Magura unit and 0.42% to 0.67% in the Grybów unit. The highest values were observed in the Mszana tectonic window (0.67%) and in the southern parts of the Magura unit (0.65-0.71%).

5

Zintegrowana biostratygrafia węglanowych osadów warstw cieszyńskich w polskich Karpatach Zachodnich

Olszewska B., Szydło A., Jugowiec-Nazarkiewicz M., Nescieruk P.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

|

2008

|

T. 34, z. 3/1

33-59

PL

W pracy przedstawiono charakterystykę stratygraficzną dolnych łupków i wapieni cieszyńskich w oparciu o zróżnicowane spektrum mikroskamieniałości. Rozmieszczenie i migracja tych mikroorganizmów do basenu cieszyńskiego, usytuowanego na południowej krawędzi Platformy Zachodnioeuropejskiej, były określone jego geotektoniczną transformacją. Pozycję niefliszowych, węglanowych utworów basenu (dolne łupki cieszyńskie i dolna część wapieni cieszyńskich) określają zespoły tytońskich mikroskamieniałości z pojedynczymi elementami późnego kimerydu. Natomiast sedymentacja węglanowych turbiditów (wyższa część wapieni cieszyńskich) miała miejsce głównie w okresie berias - walanżyn z prawdopodobną kontynuacją do (?późnego) hoterywu.

EN

Microfossils from the Tithonian-(?Late) Hauterivian carbonate deposits of the Cieszyn Beds (Lower Cieszyn Shales and Cieszyn Limestones) are reviewed. The distribution and migration of microorganisms into the Carpathian (Cieszyn) Basin were determined by geotectonic transformation of the Cieszyn Basin situated on the southern margin of the Western European Platform. The age of the nonflysch carbonate deposition in the Cieszyn basin (Lower Cieszyn Shales, and lower part of the Cieszyn Limestones) is documented by Tithonian calcareous microfossils accompanied by Late Kimmeridgian elements whereas the development of carbonate turbidite deposition in the Beriassian - Valanginian time (Cieszyn Limestones), probably continued up to the (?Late) Hauterivian.

6

Geotectonic evolution of the northern Tethyan margins in the Tithonian - sedimentological and biostratigraphical implications (Silesian Basin, Western Outer Carpathians)

Neścieruk P., Szydło A.

Volumina Jurassica

|

2006

|

Vol. 4, no. 1

62-62

EN

During the Late Jurassic the geotectonic reorganization of the extensive shelves on the southern margins of the Eastern European Platform was influenced by rifting in the Carpathian Basin which resulted in formation of the marginal Tethyan seas. The origin of the Silesian Basin was correlated with the first stage of the rifting (Golonka et al. 2000). The process of opening and deepening of the basin was completed at the end of the Jurassic when Neocimmerian movements were intensified and a regression on the Tethyan shelf had reached its peak. At that time, in the Western Outer Carpathians, breccias and olistostromes including mainly carbonate boulders, olistoliths and klippen were formed. In the Silesian Basin the supply of these redeposited materials culminated in Late Tithonian. The marly layers with olistolithes are known from the Cieszyn Silesian. The deposits occur at the top of nonflysch marly deposits, which belong to the oldest units of the Cieszyn Beds of the Polish and the Czech Outer Carpathians. In the Czech Carpathians these deposits correspond to the Ropice horizon (Eliáš & Eliášova 1984), which apart from the Štramberk reef and allodapic Cieszyn Limestones contains also calcareous sandstones and claystones including boulders of metamorphic and magmatic rocks (Eliáš & Eliášova 1984). These deposits yielded foraminifers which were also subject to removal and transportation. These include numerous calcareous (involutinids, placentulininds) and single agglutinated (lituolids) foraminifers which have been reported in rocks containing the olistolithes, but mainly in the overlying marls. Late Tithonian microfossils include also fragments of crinoids, bryozoans, and corals. These layers including calcareous material coming from destruction of the reef complex and carbonate platform can be assigned to a lithohorizon, deposited during geotectonic rebuilding of the northern Tethyan margins.

7

Analiza tempa depozycji materiału detrytycznego w basenach sedymentacyjnych zachodnich Karpat zewnętrznych jako wskaźnik aktywności tektonicznej ich obszarów źródłowych

Poprawa P., Malata T., Oszczypko N., Słomka T., Golonka J., Krobicki M.

Przegląd Geologiczny

|

2006

|

Vol. 54, nr 10

878-887

EN

Analysis of deposition rate were performed for synthetic sections, representing the upper Jurassic to lower Miocene sedimentary fill of the Western Outer Carpathian (WOC) basins. Calculated deposition rates differs in a range of a few orders of magnitude. During Tithonian to Berriasian-early Valanginian tectonic activity of the source areas supplying the Silesian Basin was related to the mechanism of syn-rift extensional elevation and erosion of horsts. General decay of source area activity in Valanginian to Cenomanian time was caused by regional post-rift thermal sag of the WOC. The Barremian to Albian phase of compressional uplift of the source area located north of the WOC lead to increase of deposition rate in some zones of the WOC basin. In Turonian to Paleocene time thick-skinned collision and thrusting took place south and south-west (in the recent coordinates) of the Silesian Basin causing very rapid, diachronous uplift of this zone, referred to as Silesian Ridge, resulting with high deposition rate in the Silesian Basin. At that time supply of sediments to the Magura Basin from south was relatively low, and the Pieniny Klipen Belt was presumably zone of transfer of these sediments. In Eocene the zone of collisional shortening in the WOC system was relocated to the south, causing rapid uplift of the Southern Magura Ridge and intense supply of detritus to the Magura Basin. Thrusting in the Southern Magura Ridge and collisional compression resulted with flexural bending of its broad foreland, being the reason for decrease of activity of both the Silesian Ridge and the source area at the northern rim of the WOC. The Eocene evolution of the Silesian Ridge is interpreted as controlled by both episodic tectonic activity and eustatic sea level changes. Contrasting development of the Southern Magura Ridge and the northern rim of Central Carpathians during Eocene stands for a palaeographic distance between the two domains at that time. During Oligocene and early Miocene a significant increase of deposition rates is observed for the basin in which sediments of the Krosno beds were deposited. This was caused by tectonic uplift of the source at the northern rim of the WOC, as well as the Silesian Ridge and the partly formed Magura nappe. The Miocene molasse of the WOC foredeep basin is characterised by notably higher maximum deposition rates than ones calculated for the flysch deposits of the WOC.

8

Morphotectonics of the Gorce Mountains, Western Outer Carpathians

Forma A., Zuchiewicz W.

Folia Quaternaria

|

2002

|

nr 73

69-78

EN

The Gorce Mts., situated in the medial segment of the Polish Outer West Carpathians, comprise two submeridional and one subparallel neotectonic elevations. Morphological features of the highest mountain ranges show properties of advanced maturity, whereas the radial pattern of deeply-cut V-shaped valleys of high and strongly diversified gradients, as well as convex and convex-concave slope profiles, together with the presence of overhanging valleys testify to young uplift. Drainage basins of the 4th order show basin elongation ratios typical for intensely uplifted regions, similarly as the stream length-gradient indices (SL), whilst the thickness of the belt of no erosion is moderate and does not exceed 80 m.

9

Tectonics of the Beskid Wyspowy Mountains (Outer Carpathians, Poland)

Konon A.

Geological Quarterly

|

2001

|

Vol. 45, No 2

179-204

EN

The structure of the Magura Nappe, within the zone of maximal bending of the Western Outer Carpathians, is described; investigations were concentrated mainly in the Beskid Wyspowy Subunit. A zone, bounded to the north and south by duplexes, comprises large characteristic synclines (Snieznica, Lubogoszcz, Szczebel, Klimas, Lopien, Cwilin, Lubon Wielki). These appear on maps as isolated "island mountains", in the Beskid Wyspowy Subunit. These synclines contrast strongly with the belt-like distribution of regional folds to the west and east of the area. The synclinal massifs developed gradually. Fold belts several hundred metres long developed in the first phase of overthrusting of the Magura Nappe, with horizontal N-S compression dominant. Thrusts separating the individual subunits developed when the face of the overthrusting Magura Nappe stopped and the stress continued to push its southern parts forwards. The next phase, with continuing horizontal N-S stress included the development of strike-slip faults and the bending of the Carpathian Arc, resulting in extension of this part of the orogen. The syncline zone within the Beskid Wyspowy Subunit underwent disintegration and particular blocks became independent. Rotation of blocks with individual synclines took place along fault zones. In the part of the Polish Outer Carpathians investigated this stage is also characterised by a change of compression from N-S to NNE-SSW. Due to the uplift of this part of the Carpathians, strike-slip faults changed into dip-slip faults in the terminal part of this phase. reconstruction.

10

Loess-like silts in the Beskid Mały and Beskid Makowski Mountains, Western Outer Carpathians

Grzybowski K.

Geological Quarterly

|

2001

|

Vol. 45, No 1

67--74

EN

Among the Quaternary deposits of the Beskid Mały and Beskid Makowski Mts. in southern Poland, loess-like silts occurring in the Skawa River valley and the Paleczka River valley are distinguishable by their high loess index values as well as by the presence of amphibole grains and by notable amounts of biotite grains. These silts originated by aeolian sedimentation during the younger Pleniglacial of the Vistulian, corresponding to the Younger Upper Loess. The amphibole and most of the biotite was derived from deflation of a glaciofluvial cover in the Carpathian forelands and Fore-Carpathian basins. They indicate the importance of northern winds in the Plenivistulian atmospheric circulation.