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Tytuł:
Nowe dane o litologii i biostratygrafii akritarchowej skał kambryjskich na Łysicy, najwyższym szczycie Gór Świętokrzyskich
New data on the lithology and acritarch biostratigraphy of Cambrian rocks of Łysica Mt., the highest summit of the Holy Cross Mountains
Autorzy:
Szczepanik, Z.
Malec, J.
Powiązania:
https://bibliotekanauki.pl/articles/2075672.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
kambr
litologia
arkritarchy
biostratygrafia
Holy Cross Mts.
Cambrian
lithology
acritarchs
biostratigraphy
Holy Cross Mountains
Opis:
The southern slope of Łysica Mountain, which is the highest elevation of the Holy Cross Mountains, is comprised of three lithological complexes divided by parallel fault zones. The uppermost part of the succession consists of quartzitic sandstone of the Wiśniówka Formation. The formation is underlain by a complex of sandstone with mudstone interbeds, with black claystone underneath, which is exposed in the upper part of the Glęboczka ravine succession. The strata of the first and the third complexes dip northward, whereas those of the second complex dip southward. In the fault-bound zone between the second and the third complexes, there are concentrations of weathering iron ore. The black claystone, which is lithologically similar to this of the Pepper Mountains Formation, contains a taxonomically rich assemblage of organic-walled microfossils (acritarchs) diagnostic of the Upper Cambrian (Lower Furongian) successions. The new record of microfossils allows determining the age of the succession composing the Łysogóry Mountains for the first time in the history of regional geological investigation.
Źródło:
Przegląd Geologiczny; 2017, 65, 9; 564--575
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of horse breed on transepidermal water loss
Autorzy:
Szczepanik, M.P.
Wilkolek, P.M.
Adamek, L.R.
Pluta, M.
Golynski, M.
Sitkowski, W.
Kalisz, G.
Taszkun, I.
Pomorski, Z.J.K.
Powiązania:
https://bibliotekanauki.pl/articles/30727.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Non-invasive methods of skin condition assessment include, among others, the evaluation of transepidermal water loss (TEWL). The aim of the study was to examine whether TEWL values depend on horse breed. The study was conducted on four breeds: “Felin” ponies (FP) (n=16), Polish koniks (PK) (n=15), Polish cold-blooded horses (PcbH) (n=11) and Wielkopolska horses (WH) (n=12). It was found that horse breed influences TEWL values. In the neck region, statistically significant differences were found between PK and FP (p=0.006), and PK and WH (p=0.0005). In the lumbar region, there were statistically significant differences between FP and PK (p=0.0009), FP and PcbH (p=0.0016) as well as between PK and WH (p=0.000037), and PcbH and WH (p=0.0006). In the inguinal region statistically significant differences were found between FP and PK (p=0.0003), FP and PcbH (p=0.0005), PK and WH (p=0.009) and PcbH and WH (p=0.006). In the lip region statistically significant differences were observed between FP and PK (p=0.013) as well as between PK and PcbH (p=0.029) and PK and WH (p=0.009). In the examination of TEWL animal breed should be taken into consideration. The non-significant differences found in three of the examined body regions may suggest that these regions are the most adequate for TEWL assessment.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of electrical impedance of biomedical objects
Autorzy:
Frączek, M.
Kręcicki, T.
Moroń, Z.
Krzywaźnia, A.
Ociepka, J.
Rucki, Z.
Szczepanik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/307125.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bioimpedancja
spektroskopia
charakterystyka częstotliwościowa
bioimpedance
bioimpedance spectroscopy
frequency characteristics
Opis:
Some basic problems related to measurements of electrical impedance of biological objects (bioimpedance) have been presented in this paper. Particularly problems arising from impedance occurring at the sensor–tissue interface (interfacial impedances) in contact measuring methods have been discussed. The influence of finite values of impedances of the current source and voltage measuring device has also been taken into consideration. A model of the impedance sensor for the four-electrode measurement method containing the interfacial, source and measuring device impedances has been given and its frequency characteristics obtained by the computer simulation have been presented. The influence of these impedances on the shape of frequency characteristic of the sensor model has been discussed. Measurements of bioimpedance of healthy and anomalous soft tissues have been described. Some experimental results, particularly the frequency characteristics of bioimpedance, have been shown. The presented results of measurement show that bioimpedance can be a valuable source of information about the tissues, so measurement of bioimpedance can be a useful supplement to other medical diagnostic methods.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 1; 11-17
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oldest rocks of the Holy Cross Mountains, Poland – biostratigraphy of the Cambrian Czarna Shale Formation in the vicinity of Kotuszów
Autorzy:
Szczepanik, Z.
Żylińska, A.
Powiązania:
https://bibliotekanauki.pl/articles/138942.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cambrian
Fortunian
Terreneuvian
Holy Cross Mountains
Kotuszów
acritarcha
biostratigraphy
kambr
fortun
terenew
Góry Świętokrzyskie
Acritarcha
biostratygrafia
Opis:
Three lower Cambrian acritarch assemblages recognized in four outcrops in the vicinity of Kotuszów in the southernmost part of the Palaeozoic inlier of the Holy Cross Mountains span a stratigraphic interval from the uppermost part of the Asteridium tornatum–Comasphaeridium velvetum Assemblage Zone to the Skiagia ornata–Fimbriaglomerella membranacea Assemblage Zone (most probably its lower part). According to current views (Moczydłowska and Yin 2012), this interval corresponds to the upper part of the Fortunian and to Stage 2 of the Terreneuvian Series. The strata yielding the oldest assemblage are thus the oldest precisely documented rocks in the Palaeozoic succession of the Holy Cross Mountains, and the oldest Cambrian rocks exposed on the surface in Poland. The current biostratigraphic scheme for the pre-trilobitic part of the Cambrian System in the Holy Cross Mountains should be modified so that it is based on local acritarch interval subzones.
Źródło:
Acta Geologica Polonica; 2016, 66, 3; 267-280
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surowce skalne w murach klasztoru na Łysej Górze : walory edukacyjne i estetyczne – propozycja wycieczki geologicznej
Natural building stones in the walls of the monastery on Łysa Góra and their educational and esthetic values : proposal of geological tour
Autorzy:
Szczepanik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2075344.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Góry Świętokrzyskie
Święty Krzyż
surowce skalne
skały w architekturze
Świętokrzyskie Mountains
Holy Cross
natural buildings stones
rocks in architecture
Opis:
Historic monastery of Holy Cross located on the top of Mt Łysa Góra (Bald Mountain) (595 m a.s.l.), which is one of the highest hills of Świętokrzyskie (Holy Cross) Mountains, is to be considered cultural and historical centre of the Świętokrzyskie region. Despite of eventful, almost a thousand-year, history, numerous destructions and redevelopments, the monastery, which up to the middle of 17th century was the biggest Polish religious sanctuary, is nowadays visited by hundreds of thousands of people annually. Through the ages, multiple types of natural building stones were used for the purpose of wall construction as well as for decoration of interiors of the monastery. In comparison with other architectural objects of the region, the monastery of Holy Cross is characterized with big diversity. Bearing in mind persistency and beauty of the structure, multiple types of natural building stones were brought to the top of Bald Mountain and can still be admired while visiting the abbey. Rocks, which represent almost entire lithostratigraphic sequence, from the Cambrian to the Neogene, can be found here. Majority of them comes from the area of Świętokrzyskie (Holy Cross) Mountains and its vicinity, however some details were made of precious raw materials imported from Scandinavia, Belgium, England and Italy, which were very rare in this part of Poland. Nowadays, viewing stone decoration of Holy Cross sanctuary, not only enables to admire work of art, but also gives the possibility to get acknowledged with richness and diversity of rocks as well as multiple interesting geological structures, which they include.
Źródło:
Przegląd Geologiczny; 2015, 63, 8; 485--499
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of non-specific anti-pruritus treatment with cyclosporine A on transepidermal water loss (TEWL) in natural atopic dermatitis in dogs
Autorzy:
Zajac, M.
Szczepanik, M.
Wilkolek, P.
Adamek, L.
Pomorski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/30117.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Atopic dermatitis is a common allergic skin disease in dogs. Monitoring the progress of treatment and the assessment of the severity of disease symptoms are crucial elements of the treatment procedure. One of the common means of assessing the severity of the clinical signs of the disease is the CADESI 03. Research studies have pointed to a possibility of assessing the severity of skin lesions by means of measuring biophysical skin parameters such as TEWL, skin hydration and erythema intensity. The aim of the study was the assessment of changes in TEWL and CADESI values measured in ten different body regions during non-specific anti-pruritus treatment. The examination was performed on ten dogs with atopic dermatitis (age from 2.5 years to 7 years, mean age 3.8 years). The measurements were performed in the following body regions: the lumbar region, the right axillary fossa, the right inguinal region, the ventral abdominal region, the right lateral thorax region, the internal surface of the auricle, interdigital region of the right forelimb, cheek, bridge of nose and the lateral site of antebrachum. A statistically significant decrease in CADESI values was reported starting from the second week of treatment. In the case of the mean TEWL values, a fall was observed after one week of treatment in the ventral abdominal region and the interdigital region, after two weeks of treatment in the axillary fossa and the inguinal region, and after three weeks in the cheek and the lateral thorax region. There was no statistically significant decrease in TEWL values in the course of treatment in four other regions.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of serum levels of allergen-specific immunoglobulin E in different seasons and breeds in healthy horses
Autorzy:
Wilkolek, P.M.
Pomorski, Z.J.H.
Szczepanik, M.P.
Adamek, L.
Pluta, M.
Taszkun, I.
Golynski, M.
Rozwod, A.
Sitkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/2087936.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The present study was designed to asses specific IgE towards environment allergens in 42 healthy horses. Determination of this immunoglobulin in serum serve as diagnostic tools in allergic diseases to improve efficacy of the treatment and proper allergen selection to specific immunotherapy. Serum levels of allergen specific IgE were measured with equine monoclonal antibody, using 15 individual and 5 mix allergens in North European Panel. The study revealed season dependent increased levels of allergen specific IgE in normal horses. It is noteworthy that healthy horses show high percentage of positive reactions, most commonly towards to domestic mites D. farinae (80%), D. pteronyssinus (35.71%) and storage mites T. putrenscentiae (42.86%), Acarus siro (40.48%). These allergens play an important role in equine, canine and feline atopic dermatitis. We also demonstrated high IgE levels in the group of horse specific insect allergens. Tabanus sp. (35.71%), Culicoides sp. (28.57%) and Simulium sp. (26.19%) were the most frequent insect positive reaction allergens. No positive reactions in all groups of allergens were found in winter season, low and merely detectable levels of antibodies have been found relating to D. farianae and T. putrescentiae allergen. We observed elevated mould-IgE levels in horses that live in stables, while outdoor living horses showed very low levels. Amongst all positive reactions we observed only weak and moderate reactions but no strong positive reactions were found. No significant differences were observed between three breeds of horses with the exception of moulds and D. pteronyssinus allergens.
Źródło:
Polish Journal of Veterinary Sciences; 2014, 17, 2; 331-337
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The examination of biophysical skin parameters (transepidermal water loss, skin hydration and pH value) in different body regions in Polish ponies
Autorzy:
Szczepanik, M P
Wilkolek, P M
Pluta, M.
Adamek, L R
Golynski, M
Pomorski, Z J H
Sitkowski, W
Powiązania:
https://bibliotekanauki.pl/articles/31823.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The purpose of this study was to evaluate transepidermal water loss, skin hydration and skin pH in normal polish ponies. Twelve ponies of both sexes were examined in the study. Measurements were taken from seven different sites: the neck region, the shoulder, thorax, lumbar, inguinal, lip region and the pinna. In each of the regions transepidermal water loss (TEWL), skin hydration and skin pH were measured. For transepidermal water loss, the lowest values were observed in the pinna (10.54 g/hm²), while the highest values were observed in the lip region (30.98 g/hm²). In the case of skin hydration the lowest values were observed for the thorax region (1.96 CU), and the highest for the lip region (48.28 CU). For skin pH, the lowest results were obtained in the pinna (7.03), and the highest in the lumbar region (8.05).
Źródło:
Polish Journal of Veterinary Sciences; 2013, 16, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka spektralna mezoporowatych węgli z nanocząstkami Ag, Au, TiO2 i Fe3O4
Spectral characterization of mesoporous carbons modified by Ag, Au, TiO2 and Fe3O4 nanoparticles
Autorzy:
Garnuszek, M.
Szczepanik, B.
Gawinkowski, S.
Słomkiewicz, P.
Witkiewicz, Z.
Jedynak, K.
Powiązania:
https://bibliotekanauki.pl/articles/236858.pdf
Data publikacji:
2012
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
uporządkowany węgiel mezoporowaty
modyfikacja
nanocząstki
widmo IR
widmo FTIR
widmo Ramana
ordered mesoporous carbon
modification
nanoparticles
IR spectrum
FT-IR spectrum
Raman spectrum
Opis:
Określono możliwość zastosowania technik spektroskopowych do charakterystyki właściwości strukturalnych mezoporowatego węgla otrzymanego metodą miękkiego odwzorowania oraz zmodyfikowanego za pomocą nanocząstek Ag, Au, TiO2 i Fe3O4. Charakterystykę spektralną próbek otrzymanych węgli przeprowadzono techniką spektroskopii IR, FTIR oraz Ramana. Podczas syntezy materiałów węglowych w środowisku kwasowym zastosowano rezorcynol i formaldehyd jako prekursory węglowe w obecności kopolimeru trójblokowego Lutrol F127. Wyniki badań spektralnych wykazały, że zastosowane metody syntezy mezoporowatych węgli pozwoliły na uzyskanie materiałów węglowych o odtwarzalnej budowie. Modyfikacja powierzchni węgla badanymi nanocząstkami spowodowała wyraźne zmiany w widmach Ramana, FTIR i IR kompozytów węglowych, przy czym na zmianę ich właściwości najsilniej wpłynęły tlenki metali. Widma te pokazały również, że w strukturze otrzymanych materiałów węglowych pojawiły się uporządkowane fragmenty grafenowe podobne do tych, jakie występują w nanorurkach węglowych.
The structural properties of mesoporous carbons modified by Ag, Au, TiO2 and Fe3O4 nanoparticles were studied using IR, FT-IR and Raman spectroscopy. The carbon materials were prepared by the soft-templating method in an acidic medium, with resorcinol and formaldehyde as the carbon precursors and triblock copolymer Lutrol F127 as a soft template. Spectral analysis has revealed that these carbons are characterized by a repeatable structure. The modification of the carbon surface by the nanoparticles examined has caused some noticeable changes in the Raman, FT-IR and IR spectra of the carbon composites, and most of the influence on the modification of the surface comes from metal oxides. The spectra have also shown that the carbon materials tested contain some ordered fragments of graphene structures similar to those occurring in carbon nanotubes.
Źródło:
Ochrona Środowiska; 2012, 34, 4; 17-22
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The examination of biophysical parameters of skin (transepidermal water loss, skin hydration and pH value) in different body regions of ponies
Autorzy:
Szczepanik, M.P.
Wilkolek, P.M.
Pluta, M.
Adamek, L.R.
Pomorski, Z.J.H.
Powiązania:
https://bibliotekanauki.pl/articles/31537.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biophysical parameter
skin
water loss
hydration
pH value
body region
pony
horse
Opis:
The purpose of this study was to evaluate transepidermal water loss, skin hydration and skin pH in normal ponies. Sixteen ponies of both sexes were examined in the study. Measurements were taken from seven different sites: the neck region, the shoulder, thorax, lumbar, inguinal, lip region and the auricle. In each of the regions transepidermal water loss (TEWL), skin hydration and skin pH were measured. For transepidermal water loss, the lowest values were observed in the lumbar region (9.71g/hm2), while the highest values were observed in the lip region (22.35 g/hm2). In the case of skin hydration the lowest values were observed for the thorax region (2.13 CU), and the highest for the lip region (41.81 CU). For skin pH, the lowest results were obtained in the lumbar region (6.93), and the highest in the lip region (7.96).
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reclamation of Polish lignite open pits by flooding
Autorzy:
Szczepiński, J.
Fiszer, J.
Stachowicz, Z.
Szczepanik, P.
Powiązania:
https://bibliotekanauki.pl/articles/2062979.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pit lakes
lignite open pit
hydrogeological conditions
Opis:
This paper presents reclamation of post-mining lignite open pits by flooding in Poland. Besides, it provides some data on hydrogeological conditions of Polish lignite mines. Reclamation by flooding is presently used in post-mining voids in the Adamów Lignite Mine and the Konin Lignite Mine, and it is anticipated to be used in the future, in the case of large-space abandoned open pits in the Turów Lignite Mine and the Bełchatów Lignite Mine, whose volume will exceed one billion cubic meters. Pit lakes in Poland are formed deliberately as a planned part of the after-use of lignite surface mine voids and they are used as wildlife habitats, fisheries, water sports venues or other forms of amenity. In each case the mine voids are flooded by natural groundwater inflow, water pumped out from dewatering system and water from rivers and courses. In the existing and abandoned Polish lignite open pits there are favorable conditions in terms of water quality formation, so the water in pit lakes is of a good quality. However, the studies indicate a potential threat to the water quality in pit lakes, where they are recharged only by groundwater. Therefore, additional recharge the void with surface water or water pumped out from dewatering wells reduces the probable pit lakes deterioration.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 441 Hydrogeologia z. 10; 167--174
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Litologia i zespół akritarchowy formacji z Zalesia w Górach Świętokrzyskich na tle zmian poziomu morza i paleogeografii późnego ordowiku
Lithology and acritarch assemblage of the Zalesie Formation in the Holy Cross Mountains on the background of the Late Ordovician paleogeography and sea-level changes
Autorzy:
Trela, W.
Szczepanik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2074684.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
hirnant
regresja
akritarchy
warstwy osadowe wtórne
Polska
Hirnantian
regression
acritarchs
redeposition
Polska
Opis:
The uppermost Ordovician in the Holy Cross Mountains is represented by sandy mudstones, sandstones and marls of the Zalesie Formation deposited during the Hirnantian regression. Two arcitarch assemblages were recognized in the studied Upper Ordovician succession of the southern Holy Cross Mountains. The first one is dominated by species of Baltisphaeridium, Polygonium, Exculibranchium, Orthosphaeridium, Ordovicidium, Peteinosphaeridium, Multiplicisphaeridium, which occur in the upper Caradoc deposits. Upward in the section, these taxa are replaced mainly by diversified species of Veryhachium occurring together with Domasia, Deunfia, Leiofusa, Polygonium, Cheleutochroa, Multiplicisphaeridium and Polygonium. In the Zalesie Formation (upper Ashgill) they are accompanied by the redeposited Furongian/Lower Ordovician specimens and the Middle Ordovician species of the peri-Gondwanian affinity (e.g. Frankea), which were likely transported from Avalonia during collision of this terrane with Baltica.
Źródło:
Przegląd Geologiczny; 2009, 57, 2; 147-157
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do We Understand Magnetic Properties of ZnMnO?
Autorzy:
Godlewski, M.
Wójcik, A.
Kopalko, K.
Ivanov, V. Yu.
Wilamowski, Z.
Jakieła, R.
Guziewicz, E.
Szczepanik, A.
Dłużewski, P.
Chikoidze, E.
Barjon, J.
Dumont, Y.
Putkonen, M.
Niinistö, L.
Tang, Dong
Powiązania:
https://bibliotekanauki.pl/articles/2047644.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Gh
75.75.+a
78.30.Fs
78.60.Hk
Opis:
Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 261-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of Middle Jurassic mudstones (Kraków-Częstochowa area, southern Poland): interpretation of the depositional redox conditions
Autorzy:
Szczepanik, P.
Witkowska, M.
Sawłowicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2059479.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Jurassic
Częstochowa Clay Formation
palaeoenvironment
geochemical parameters
redox conditions
Opis:
Middle Bathonian iron-bearing dark grey mdstones and claystones from the Kraków-Czestochowa Upland (southern Poland) were subjected to geochemical and mineralogical study in order to evaluate palaeo-redox conditions of their deposition and diagenesis. They are mainly composed of kaolinite, with smaller amounts of other clay minerals and detrital quartz. Organic matter is composed of type III and/or IV kerogen and its d13C is between -23 and -24‰, suggesting a mainly terrigenous source, with a possible admixture of marine input. Most geochemical parameters: (total organic carbon) TOC/S, U/Th, Ni/Co, V/Cr, (Cu+Mo)/Zn ratios, authigenic uranium content, and Fe-TOC-S relationship, indicate deposition under oxygenated bottom water conditions. By contrast, DOP (degree of pyritization) and V/V+Ni indices suggest a dysoxic environment. However, DOP probably reflects redox conditions in the sediment during diagenesis rather than in the over laying water column. The composition of the organic matter and the domination of pyrite euhedra over framboids indicates that the V/V+Ni ratio may not be reliable for determination of redox conditions in the rocks studied. There is no significant difference between the geochemical indices of host rocks with nodules and those with out them.
Źródło:
Geological Quarterly; 2007, 51, 1; 57-66
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pyrite framboids in pyritized Radiolarian skeletons (Mid-Cretaceous of the Pieniny Klippen Belt, Western Carpathians, Poland)
Autorzy:
Szczepanik, P.
Sawłowicz, Z.
Bąk, M.
Powiązania:
https://bibliotekanauki.pl/articles/191646.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
radiolaria
pyritization
framboids
Cretaceous
Pieniny Klippen Belt
Opis:
Well preserved pyritized radiolarian skeletons have been found within the grey-green Mid-Cretaceous (Upper Cenomanian) shales in the Pieniny Klippen Belt (Carpathians, Poland). The skeletons contain numerous pyrite framboids in different positions, in channels and inside the abdomen of cryptothoracic forms, but their genetic context is not known. They were formed as a result of the reaction between dissolved iron and sulphide originated from the bacterial sulphate reduction. Two sources of organic matter, "post mortem" in situ decaying organic matter of radiolaria and disseminated organic matter from the surrounding sediment could be available for this process. Pyrite found in the radiolarians probably originates from different processes. It is suggested that pyritization of the radiolarian skeletons took place in the water column whereas pyrite framboids in the skeleton's free spaces could have been formed later during the diagenesis of the sediment. However, their simultaneous formation in the water column or in the sediment cannot be excluded.
Źródło:
Annales Societatis Geologorum Poloniae; 2004, 74, No 1; 35-41
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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