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Wyświetlanie 1-15 z 311
Tytuł:
Dangerous drivers behavior in road traffic - reasons, results, prevention
Autorzy:
Bąk, J.
Bąk-Gajda, D.
Powiązania:
https://bibliotekanauki.pl/articles/246215.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
drivers
aggression
psychological tests
Opis:
Driving a car is a task demanding particular competencies, which include: knowledge, skills and specific personality and mental traits. Every driver should posses: knowledge about traffic law regulations, practical skills of driving a vehicle, ability to predict traffic situations and, what is especially important, self-diagnosis ability. Those skills determine driving safety. Paper presents dangerous and aggressive driving behaviour on the roads. It describes characteristic features of drivers and type of offenses committed by them, as well as recognition of the scale and reasons for aggression in the road traffic. Paper includes detailed research results analyses of aggressive behaviour and its evaluation by road traffic controllers - police (408 persons), and by drivers participating in the demerit points reduction scheme (504 persons). Survey results indicate that drivers consciously break traffic law, underestimate danger, overestimate their own abilities, feel unpunished and they don't know traffic regulations well. All results shows that aggression is a frequent problem, especially concerning 18-39 year old group with wrong attitudes towards others road users. Importance of psychological testing of drivers, necessity of psycho-educational and preventive actions was pointed out in view of these circumstances. Research has allowed determining psychological reasons of the drivers' attitude and behaviour. Conclusions suggest undertaking activities and campaigns whose purpose is to change dangerous attitudes and habits and create re-education systems for the drivers who regularly break road traffic regulations.
Źródło:
Journal of KONES; 2008, 15, 2; 15-20
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response of Ornithogalum saundersiae Bak. to salinity stress
Reakcja Ornithogalum saundersiae Bak. na stress solny
Autorzy:
Salachna, P.
Zawadzińska, A.
Podsiadło, C.
Powiązania:
https://bibliotekanauki.pl/articles/11543354.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Most of the studies on the effects of salinity stress are conducted on ornamental bedding plants and perennials but little is known on flower bulbs response to this stress factor. Ornithogalum saundersiae is an attractive bulbous plant recommended for growing in pots, gardens and green areas. The study conducted in the years 2013–2014 investi-gated the effects of NaCl on the growth, flowering, photosynthetic activity, pigment content, and macro- and micronutrient content in the leaves of O. saundersiae. The plants were grown in pots in a plastic tunnel. NaCl was applied once a week for six weeks at concentration of 100 mM or 200 mM. The salt treatment did not cause chlorosis and did not affect flowering rate and number of inflorescences. The plants exposed to salinity stress had lower fresh weight of leaves, inflorescences and bulbs and their flowering be-gan later than in the control plants. Photosynthesis and transpiration intensity decreased as NaCl concentration increased. The content of chlorophyll and carotenoids in NaCl treated plants was significantly higher than in the control plants. Salinity stress increased the leaf content of nitrogen, potassium, sodium and chlorine and reduced the concentration of calcium, zinc and iron.
Większość badań nad wpływem warunków stresowych wynikających z zasolenia prowadzi się na ozdobnych roślinach rabatowych i bylinach, natomiast wciąż niewiele jest informacji dotyczących reakcji geofitów na ten czynnik. Ornithogalum saun-dersiae to atrakcyjna roślina cebulowa polecana do uprawy w pojemnikach, w ogrodach i na terenach zieleni. Przeprowadzone w latach 2013–2014 badania dotyczyły oceny wpływu NaCl na wzrost, kwitnienie, funkcjonowanie aparatu fotosyntetycznego, zawartość barwników oraz makro- i mikroskładników w liściach O. saundersiae. Rośliny uprawiano w doniczkach w tunelu foliowym. Zasalanie prowadzono raz w tygodniu, przez okres 6 tygodni, stosując roztwór NaCl w stężeniu 100 i 200 mM. Stwierdzono, że traktowanie roślin NaCl nie spowodowało chloroz, nie miało wpływu na procent kwitnących roślin oraz na liczbę kwiatostanów. Pod wpływem stresu solnego rośliny miały zmniejszonąświeżą masę liści, kwiatostanów i cebul oraz rozpoczynały później kwitnienie. Intensywność fotosyntezy i natężenie transpiracji zmniejszyło się wraz ze wzrostem stężenia NaCl. Zawartość chlorofilu i karotenoidów w liściach roślin traktowanych NaCl była istotnie wyższa w porównaniu z roślinami kontrolnymi. W wyniku zasolenia wzrosła zawartość w liściach azotu, potasu, sodu i chloru, natomiast spadła zawartość wapnia, cynku i żelaza.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 1; 123-134
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Carboniferous trilobite remains from limestones of the Dębnik Anticline, southern Poland
Autorzy:
Bąk, M.
Dulemba, P.
Bąk, K.
Powiązania:
https://bibliotekanauki.pl/articles/184813.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
trilobites
arthropods
Lower Carboniferous
Dębnik anticline
Raclawka Valley
Polska
Opis:
The presence of proetid trilobites' remnants is reported for the first time from the Lower Carboniferous limestones of the Dębnik Anticline outcropping in the Raclawka Valley, situated in the eastern part of the Upper Silesian Block (southern part of the Cracow Upland). Disintegrated exoskeletons of trilobites are observed in thin sections of fine-grained, peloidal wackstones and packstones. These rocks contain also foraminifers which indicate an early Tournaisian age for this locality.
Źródło:
Geology, Geophysics and Environment; 2014, 40, 1; 27-32
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Harmonic domain modelling of transformer core nonlinearities using the DIgSILENT powerfactory software
Autorzy:
Wiechowski, W.
Bak-Jensen, B.
Bak, C. L.
Lykkegaard, J.
Powiązania:
https://bibliotekanauki.pl/articles/262821.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
autotransformers
harmonic analysis
nonlinearities
simulation software
transformer cores
Opis:
This paper demonstrates the results of implementation and verification of an already existing algorithm that allows for calculating saturation characteristics of singlephase power transformers. The algorithm was described for the first time in 1993. Now this algorithm has been implemented using the DIgSILENT Programming Language (DPL) as an external script in the harmonic domain calculations of a power system analysis tool PowerFactory [10]. The algorithm is verified by harmonic measurements on a single-phase power transformer. A theoretical analysis of the core nonlinearities phenomena in single and three-phase transformers is also presented. This analysis leads to the conclusion that the method can be applied for modelling nonlinearities of three-phase autotransformers.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 3-11
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Kalanchoe pumila Bak. leaves (Crassulaceae DC.)
Struktura liści Kalanchoe pumila Bak. (Crassulaceae DC.)
Autorzy:
Chernetskyy, M.
Weryszko-Chmielewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/27963.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
leaf structure
Kalanchoe pumila
leaf
Crassulaceae
plant morphology
plant anatomy
ultrastructure
Opis:
The structure of Kalanchoё pumila Bak. was studied with the use of stereoscopic, light, scanning and transmission electron microscopy. It was found that the chlorenchymatic tissue was divided into subepidermal small-celled mesophyll and large-celled (water transporting, CAM type) mesophyll, placed in the central part of the leaf. The mesophyll structure and its cell ultrastructure indicate C3 photosynthesis in this taxon, whereas CAM photosynthesis, being an adaptive syndrome, is induced by external factors. Three groups of xeromorphic traits were observed in the structure of K. pumila leaves, related to: 1) storing water in the ground and epidermal tissues, 2) decreased transpiration (the closing of stomata during heat), 3) avoiding excess insolation of the mesophyll and overheating of the leaf (striated cuticula, anthocyan pigments, tannin storage). The last two groups of xeromorphic traits also include thickening of the outer walls of cuticular cells, a thick-layered cuticula, and the presence of epicuticular wax and calcium carbonate deposits. Microchannels which enhance transpiration effi ciency in developing K. pumila leaves were found in the vicinity of anticlinal walls in the outer walls of epidermal cells. Calcium deposits produced on the leaf surfaces protect them in extreme conditions. Adaptive traits in the structure of K. pumila leaves are conservative and they confi rm the relations between this taxon and the conditions in their native land.
Przy zastosowaniu mikroskopii stereoskopowej, świetlnej oraz skaningowej i transmisyjnej elektronowej badano strukturę liści Kalanchoё pumila Bak. Stwierdzono, że tkanka chlorenchymatyczna w liściach jest podzielona na mezofi l drobnokomórkowy subepidermalny oraz mezofi l wielkokomórkowy (wodonośny, typu CAM) położony w środkowej części liścia. Budowa mezofi lu i ultrastruktura jego komórek wskazuje na C3 typ fotosyntezy u tego taksonu, a fotosynteza typu CAM, jako syndrom przystosowawczy, indukowana jest czynnikami zewnętrznymi. W strukturze liści K. pumila zaobserwowano trzy grupy cech kseromorfi cznych związanych z: 1) magazynowaniem wody w tkance miękiszowej i epidermalnej, 2) obniżeniem transpiracji (zamknięcie aparatów szparkowych w czasie upału), 3) ze zmniejszeniem nasłonecznienia mezofi lu i przegrzewania liścia (prążkowana kutykula, występowanie barwników antocyjanowych, gromadzenie substancji garbnikowych). Dwie ostatnie grupy cech kseromorfi cznych obejmują ponadto: zgrubienie zewnętrznej ściany komórek skórki, grubowarstwową kutykulę, występowanie wosku epikutykularnego oraz złogów węglanu wapnia. W sąsiedztwie ścian antyklinalnych w zewnętrznych ścianach komórek epidermy wykazano obecność mikrokanalików, które niewątpliwie zwiększają zdolność wyparowania wody w rozwijających się liściach roślin K. pumila w czasie wegetacji. Jednakże wyprodukowane na powierzchni liści osady wapienne chronią te organy w warunkach ekstremalnych. Cechy adaptacyjne występujące w strukturze liści K. pumila są konserwatywne i potwierdzają związek tego taksonu z warunkami występowania w ojczyźnie.
Źródło:
Acta Agrobotanica; 2008, 61, 2
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic analysis of corruption at the company level
Autorzy:
Bąk, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/1356330.pdf
Data publikacji:
2020-11-20
Wydawca:
Uniwersytet Warszawski. Wydział Nauk Ekonomicznych
Tematy:
corruption
companies
extortion
Opis:
Corruption is a factor that affects a company severely either directly or indirectly. It may have a positive or negative impact on the economic situation of the company. This article verifies the hypothesis about the corporate perception of corruption as an obstacle to business performance. It also identifies which factors do have a substantial effect on the perception of corruption by companies. The study was carried out using the logit model. The data used were obtained from the Business Environment and Enterprise Performance Survey (BEEPS) database for 2016.
Źródło:
Central European Economic Journal; 2020, 7, 54; 186 - 204
2543-6821
Pojawia się w:
Central European Economic Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lithistid spicules in the sediments of the Turonian Variegated Shale in the Silesian Nappe, Polish Outer Carpathians
Autorzy:
Okoński, S.
Górny, Z.
Bąk, M.
Bąk, K.
Powiązania:
https://bibliotekanauki.pl/articles/184590.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sponge spicules
lithistida
Turonian
Variegated Shale
Silesian Nappe
Outer Carpathians
Opis:
Turbiditic silty and sandy intercalations in the Turonian Variegated Shale from the Silesian Nappe (Polish Outer Carpathians) contain numerous sponge spicules among siliciclastic fine-grained particles. The highest amount of spicule admixture is nearly 50%. In such layers, they create spiculitic sublitharenite microfacies. These sponge spicules contain forms belonging mostly to the Lithistida group (97% of morphotypes), with a small admixture of spicules from the Hexactinellidae group. Tetraclones with a high content of different types of triaenes dominate among desmas, what indicates the dominance of sponges from subfamily Tetracladina. The preservation state of spicules is generally poor. The Variegated Shale deposits that contain the sponge spicules were accumulated in a deep sea basin, below the calcium compensation depth. Most probably, the spicules were derived from loose material accumulated earlier in various parts of the basin slopes, from which they were exhumed and again redeposited by turbidity currents during the Turonian times.
Źródło:
Geology, Geophysics and Environment; 2014, 40, 1; 33-48
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mid-Cretaceous spicule-rich turbidites in the Silesian Nappe of the Polish Outer Carpathians : radiolarian and foraminiferal biostratigraphy
Autorzy:
Bąk, M.
Bąk, K.
Ciurej, A.
Powiązania:
https://bibliotekanauki.pl/articles/2058910.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Outer Carpathians
middle-upper Cenomanian
spicule-rich turbidites
radiolarians
foraminifers
biostratigraphy
Opis:
Spicule-rich turbidites are widespread in mid-Cretaceous deep-water flysch of the Subsilesian and Silesian units in the Polish Outer Carpathians. The spicule-richmaterial with an admixture of numerous radiolarian and foraminiferal particles was supplied, together with siliciclastic material, from shallow environments, mostly from the northern margin of the Carpathian Basin. We present new data on the age of these deposits in the Silesian Nappe, where they are distinguished as the Mikuszowice Cherts. This unit is composed of mediumand thick-bedded siliciclastic to calcareous turbidites including bluish cherts in their middle and upper parts and of thin non-calcareous hemipelagic shales.We have studied radiolaria and foraminifera from hemipelagic sediments and spicule-rich turbidites, from two continuous sections in the Barnasiówka Range (BeskidWyspowyMts.) that included theMikuszowice Cherts (31 m thick) and their transition into the surrounding units. The age of the Mikuszowice Cherts was determined taking into account the following radiolarian datum events: (1) the occurrence of Praeconocaryomma lipmanae in the entire unit, (2) the FO (first occurrence) of Hemicryptocapsa tuberosa in the upper part of the unit, (3) the FO of Amphipyndax stocki close to the upper boundary of the unit, (4) the FO of Hemicryptocapsa prepolyhedra in the lowermost part of the overlying Barnasiówka Radiolarian Shale Formation. These datum events appear successively in theWestern Tethys successions within the Rotalipora cushmani planktonic foraminiferal Zone, which corresponds to the middle and upper Cenomanian (except for its uppermost part). The foraminiferal assemblages, in which such taxa as Rotalipora cf. cushmani, R. cf. greenhornensis, whiteinellids and Uvigerinammina praejankoi successively appear, confirm the mid-late Cenomanian age of the spicule-rich turbidites in the Silesian Nappe.
Źródło:
Geological Quarterly; 2005, 49, 3; 275--290
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evidence of bacteriogenic iron and manganese oxyhydroxides in Albian-Cenomanian marine sediments of the Carpathian realm (Poland)
Autorzy:
Bąk, M.
Bąk, K.
Górny, Z.
Stożek, B.
Powiązania:
https://bibliotekanauki.pl/articles/191443.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
iron
manganese
iron-related bacteria
Albian–Cenomanian
Silesian Nappe
Tatra Mts.
Carpathians
Opis:
The Albian and Cenomanian marine sediments of the Silesian and Tatric basins in the Carpathian realm of the Western Tethys contain ferric and ferromanganese oxyhydroxides, visible macroscopically as brown stainings. They coat calcareous bioclasts and mineral clasts, fill pore spaces, or locally form continuous, parallel microlayers, tens of micrometers thick. Light-microscope (LM) and scanning-electron-microscope (SEM) obser- vations show that the coatings contain elongated capsules, approximately 3–5 µm across and enriched in iron and manganese, which may be remnants of the original sheaths of iron-related bacteria (IRB). Moreover, the ferric and ferromanganese staining observed under LM is similar to bacterial structures, resembling the sheaths, filaments and rods formed by present-day bacteria of the Sphaerotilus–Leptothrix group. All of the possible bacteria-like structures are well preserved owing to processes of early diagenetic cementation. If the observed structures are fossil IRB, these organisms could have played an important role in iron and manganese accumulation on the sea floor during Albian–Cenomanian time. The most plausible source of metals for bacterial concentration in the Silesian Basin might have been submarine low-temperature hydrothermal vents, as previously was hypothesized for Cenomanian–Turonian deposits on the basis of geochemical indices.
Źródło:
Annales Societatis Geologorum Poloniae; 2015, 85, 2; 371-385
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point cloud unification with optimization algorithm
Autorzy:
Błaszczak-Bąk, W.
Sobieraj, A.
Powiązania:
https://bibliotekanauki.pl/articles/298162.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
laser scanning
unification
optimization
Opis:
Terrestrial laser scanning is a technology that enables to obtain three-dimensional data - an accurate representation of reality. During scanning not only desired objects are measured, but also a lot of additional elements. Therefore, unnecessary data is being removed, what has an impact on efficiency of point cloud processing. It can happen while single point clouds are displayed - user decides what he wants to deleted and does it manually, or by using tools provided in dedicated for point cloud processing softwares. In Leica Geosystems Cyclone - software used here in tests, user can apply tools e.g. for merging or unification of point clouds. Both of them change the separate points clouds into one points cloud, however unification can be executed with reduction - low, medium, high, highest or no reduction at all. It should be noted, that the modeled objects may have complex structure and unification with selected type of reduction can have a very big impact on the result of modeling. In such situation it is desirable to apply different types of reduction. In this article authors propose to apply an optimization algorithm on unified point clouds. Unification conducted by means of Cyclone Leica Geosystems (v.7.3.3) enables to merge point clouds and reduced the number of points. The point elimination is determined mainly by spacing between points. It may leads to loose of important points - representing some essential elements of scanned objects or area. Applying optimization algorithm, especially for complex objects, may help to reduce the number of points without losing the information necessary for proper modeling.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2015, 18(4); 271-282
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ambivalent attitudes towards social media
Autorzy:
Szymkowiak, Andrzej
Garczarek-Bąk, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/609621.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
social media
ambivalence
online users
Opis:
The use of social media (SM) is prevalent not only in private, but also in professional areas, and its overall involvement in our lives has grown immensely over the past decade. According to Bishop (2018), this is a phenomenon unlike anything seen throughout history. Previous studies on SM have analysed this subject unilaterally – giving greater emphasis to the positive or negative impact on its users. This novel article analyses the problem of the co-existence of opposing emotions towards SM based on the example of Facebook. Data from 274 young respondents (since teenagers and young adults spend on average 2–3 hours a day connected to SM sites, more so than other groups) (Healey, 2017), were collected on various areas of SM usage perception. The results present the existence of ambivalent attitudes towards Facebook threefold: as a place for building relationships, as a source of knowledge about the life of friends, and as a source of information. The article raises doubt as to what extent SM has an impact on their users in the future. The issue of SM affecting the user (no matter their age) generally focuses on the negative aspects (SM are being blamed for increasing mental health problems among young people) (Girl Effect team, 2018); therefore, the fidings here suggest that a balanced perspective is required, also including some positive aspects.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2019, 53, 1
0459-9586
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coal-bearing submarine slump sediments from Oligocene–Miocene transition of the Eastern Carpathians (Bieszczady Mountains, SE Poland)
Autorzy:
Bąk, K.
Wolska, A.
Zielińska, M.
Bąk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060286.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal pebbles
submarine slump
petrography
foraminifera
Oligocene–Miocene transition
Outer Carpathians
Bieszczady Mts.
Opis:
A new finding of lustrous coal particles from the youngest flysch sediments of the Silesian Nappe, Polish Eastern Carpathians, outcropped in the Bieszczady Mountains is here presented. The coal material occurs in a 1-m thick submarine slump layer in the Kiczera Dydiowska Sandstones, which belong to the youngest part of the Krosno Beds. Coal particles are numerous (up to 16%) in a massive sandstone of the slump layer. The siliciclastic particles from these sediments are classified as material from weathered rocks of continental block or they have been recycled from post-orogenic sediments. Lustrous coal represents coaly plant fragments, which are mostly homogeneous, belonging to macerals of vitrinite group. Some coal pebbles display tree structure, typical of gelified xylites, due to impregnation of cell walls by resinite, which occurrence in this material indicates terrestrial plants producing waxes and resins. Some of gelified plant debris shows evidence of pyritization, what in the absence of inertinite macerals in coal may indicate dysoxic conditions during first decomposition processes of organic matter under water environment. Coaly-bearing slump moved down most probably from SW during Oligocene–Miocene transition time. This shows that an intrabasinal massif, as the uplifted fragment of ?Precambrian craton, which supplied large amount of siliciclastic material to the Silesian–Subsilesian basin during the lower–middle Oligocene, still existed at the end of the Oligocene.
Źródło:
Geological Quarterly; 2015, 59, 2; 300--315
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Foraminiferal and radiolarian biostratigraphy of the youngest (Late Albian through Late Cenomanian) sediments of the Tatra massif, Central Western Carpathians
Autorzy:
Bąk, K.
Bąk, M.
Powiązania:
https://bibliotekanauki.pl/articles/138987.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Albian–Cenomanian
Tatra massif
biostratigraphy
foraminifera
radiolaria
alb
cenoman
Tatry
masyw
biostratygrafia
otwornice
promienice
Opis:
The foraminiferal and radiolarian biostratigraphy of selected sections of the Zabijak Formation, the youngest sediments of the Tatra massif (Central Western Carpathians), have been studied. Benthic foraminifers, mainly agglutinated species, occur abundantly and continuously throughout the studied succession, while planktic foraminifers are generally sparse. Five planktic and two benthic foraminiferal zones have been recognized. The marly part of the Zabijak Formation comprises the Pseudothalmanninella ticinensis (Upper Albian) through the Rotalipora cushmani (Upper Cenomanian) planktic foraminiferal zones, and the Haplophragmoides nonioninoides and Bulbobaculites problematicus benthic foraminiferal zones. The radiolarians were recognized exclusively in the Lower Cenomanian part of the formation.
Źródło:
Acta Geologica Polonica; 2013, 63, 2; 223-237
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Siliciclastic input into Upper Cenomanian synorogenic sediments of the High-Tatric Unit, Central Western Carpathians (Tatra Mountains); petrography, geochemistry and provenance
Autorzy:
Wolska, A.
Bąk, K.
Bąk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060546.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrography
geochemistry
Upper Cenomanian
Zabijak Formation
High-Tatric Unit
Central Western Carpathians
Opis:
The Upper Cenomanian mixed siliciclastic-carbonate succession of the High-Tatric Unit was deposited during the initial stage of basinal closing of the Tatric area, part of the Zliechov (Križna) Basin (Inner Carpathian domain). As a result of tectonic activity taking place at the northern Veporic margin, pulses of siliciclastic input interrupted marine carbonate sedimentation. The siliciclastic material, part of the Zabijak Formation, has been studied along two sections (Pisana Gully and Zdziarski Gully) in the Western Tatra Mountains. Microfacies, petrographic and geochemical analyses reveal a variability of siliciclastic material composed of various types of granitoids and medium- or high-grade metamorphic rocks, with schists and gneisses. Such interpretation is confirmed by the results of elemental chemical analyses, in which immobile trace elements, such as REE, Th, Cr, Co, Zr, and Y were used as indices for sediment provenance. The parent rocks sustained moderate to intense chemical weathering, documented by chemical weathering indices (CIA, PIA, CIW, R). The weathering occurred in a humid climate with relatively high precipitation that caused strong leaching of particles. Chemical indices related to sorting processes suggest that the recycling of the source material was a minor significance. The siliciclastic input displays a waning upward tendency in the sections, which can be associated with diminishing of the source area by gradual inland progradation of a carbonate platform, caused by a global sea level rise during the Late Cenomanian.
Źródło:
Geological Quarterly; 2016, 60, 4; 919--934
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 311

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