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Tytuł:
Palaeoecology of the Middle Miocene foraminifera of the Nowy Sącz Basin (Polish Outer Carpathians)
Autorzy:
Gonera, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060628.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Polska
Paratethys
Middle Miocene
foraminifera
palaeoecology
Opis:
Foraminifera from newly exposed outcrop sections located in a Middle Miocene piggyback basin of the Outer Carpathians Nowy Sącz Basin indicate an environment of normal saline waters on the inner shelf and a temperature not lower than 18oC. The area was ideal for the proliferation of: Miliolina spp., Elphidium crispum, Ammonia beccarii and Pararotalia. The habitat below the sediment surface was not colonised by foraminifera. Planktonic foraminifera are absent. The age of the population studied is referred based on the climate-related data, to the Orbulina suturalis Zone of the Miocene Climate Optimum.
Źródło:
Geological Quarterly; 2012, 56, 1; 107-116
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in shell size of the bivalve Varicorbula between marginal parts of the Vienna and Danube basins
Autorzy:
Fuksi, T.
Powiązania:
https://bibliotekanauki.pl/articles/184316.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Middle Miocene
marine sediments
molluscan community
Opis:
Middle Miocene marine sediments in the Vienna and Danube Basins provide opportunities for analysis of spatial and temporal variations in the composition of molluscan communities and variations in species abundance and size. Varicorbula gibba (Olivi 1792) is an opportunistic bivalve with high tolerance to hypoxic conditions and variations in salinity (Holmes & Miller 2006) that appears in the Oligocene and persists to present, occurring in the tropical and northern temperate Eastern Atlantic and in the Mediterranean. Varicorbula belongs to one of the most frequent species in the benthic communities in the Paratethys during the Middle Miocene. However, spatial and temporal variations in taphonomic preservation and in abundance, size, and shape of this genus is poorly known – insights into such variations would improve paleoenvironmental interpretations. Molluscan assemblages with Varicorbula gibba (Olivi 1792) were collected from boreholes located in the western (Vienna basin) and eastern (Danube basin) margins of the Malé Karpaty Mountains (Slovakia). Boreholes intersect sediments of the Studienka Formation (Vienna Basin) respective Madunice Formation (Danube Basin) that belong mainly to the Upper Badenian stage (Janočko et al. 2003, Kováč et al. 2004). We have selected assemblages with more than 20 Varicorbula specimens from sediment samples sieved with 1 mm mesh size. A well preserved shelly material contains presently more than 130 specimens of Varicorbula , with ongoing screening of additional samples. We measured dimensions of four morphological variables (in mm). Shell length, shell height, posterior shell length and upper shell height were measured on all specimens. The valves were photographed and the dimensions were measured using ImageJ image analysis software. We used principal component analysis (PCA) and bivariate and multivariate allometric analyses to investigate ontogenetic and spatial variations in size and shape. We find that this taxon shows significant regional-scale differences in size distribution between the coeval Upper Badenian sediments in the Vienna and Danube basins, with significantly smaller size in the Danube Basin. In subtidal muds in the northern parts of the Vienna Basin, Varicorbula gibba achieves very high proportional community-level abundance and its median shell width ranges between 6–10 mm. Specimens from low-energy muddy sediments of the Vienna basin show low levels of taphonomic damage but are frequently bored by naticids snails that produce the trace fossil Oichnus paraboloides (Bromley 1981, Pek et al. 1997). In contrast, muddy sands from the northeastern margin of the Danube Basin; community composition is more even and median width ranges just between 3–4 mm. The higher sandy content and lower sedimentation rates (as evidenced by higher taphonomic damage, with higher proportion of bored specimens (by muricid snails – Oichnus simplex, in the Danube Basin; Bromley 1981) imply that the regional size differences can partly positively correlate with nutrient supply. Morphometric analyses indicate that height and width of individuals of this taxon undergo significant ontogenetic allometry and that smaller-sized individuals in the Danube Basin have a smaller width/ height ratio. Therefore, some shape differences in the height-width ratio between the two basins are unrelated to ontogenetic allometric effects (because height-width ratio changes even during the ontogeny).
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 71-72
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Miocene (Early Badenian) Amphistegina (Foraminiferida) from Olimpów (Central Paratethys, Poland)
Autorzy:
Gonera, M.
Powiązania:
https://bibliotekanauki.pl/articles/191948.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
foraminifera
Amphistegina
Middle Miocene
Paratethys
Polska
Opis:
Specimens of Middle Miocene (Early Badenian) Amphistegina from the Polish Carpathians were examined. A section, sampled at the Olimpów quarry, displays chloralgal carbonates, rich in rhodolith nodules. Symbiont-bearing foraminifera (Amphistegina, Elphidium and Asterigerinata) constitute 15–57% of the total foraminifera assemblage. Amphistegina hauerina d’Orbigny, 1846 is the only species of the genus in the deposits studied. The sensitivity of larger foraminifera to water turbulence and light availability was applied in a reconstruction of the community habitat. The diameter and thickness of the Amphistegina tests indicate that the habitat was a zone of low light penetration and weak energy – a palaeoenvironment, similar to that of the modern A. radiata (Hottinger et al., 1993). Changes in the sphericity of the Amphistegina tests reflect a temporal drop of bathymetry in the middle part of the section. This is supported by other environmentally controlled features of the foraminiferal assemblage: the percentages of both planktonic and symbiont-bearing forms, as well as the proportions of robust and flat forms of Elphidium. It is possible that this variation in depth was due to eustatic changes in sea level, caused by Event Mi3 of the Middle Miocene climatic cooling. The spiral diameter of the test was at its lowest value then, indicating that maturity was reached at a faster rate. The period of shoaling offered the best life conditions for Amphistegina in this particular area.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 2; 151--159
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Globorotaliid intervals of the sub-evaporite Badenian (Middle Miocene) in the Upper Silesia Basin (Central Paratethys, Poland)
Autorzy:
Gonera, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060306.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Miocene
Badenian
foraminifers
Globorotaliidae
Paratethys
Opis:
Globorotaliids of the Skawina Formation (Badenian) come from deposits representing CPN 7 (Orbulina suturalis Zone) and CPN 8 sub-evaporite Wielician (Globigerina druryi–G. decoraperta Zone alias Uvigerina costai Zone) age. There are two taxonomic groups of globorotaliids in the studied material: globoconellids (Globoconella bykovae and G. minoritesta) and jenkinsellids (Jenkinsella mayeri and J. transsylvanica). There are five stratigraphically-rank intervals of these foraminifers prior to the Middle Badenian salinity crisis in Central Paratethys. The investigated Badenian begins with G. bykovae–J. mayeri association followed by the first occurence (FO) of J. transsylvanica. The closing member of the CPN 7 biozone is the G. bykovae–J. transsylvanica assemblage. The jenkinsellids disappear during CPN 7: J. mayeri first and J. transsylvanica after. Since the base of CPN 8 in situ jenkinsellids have not been noted in the Badenian deposits. The CPN 8 begins with a stratigraphic interval barren of globorotaliids (biozone IIC in the Polish Paratethys). It is followed by episodic appearances of globoconellids (G. bykovae and G. minoritesta) in the sub-evaporite Wielician (IID biozone in Poland). G. minoritesta has been found in only one case so far. The globorotaliid stratigraphic units are distinct and well-correlated with changes in climate and the circulation of water masses in Paratethys. This study provides additional data on Mi3 in Paratethys. It documents a cryptic cooling event in the late Orbulina suturalis Zone (mid CPN 7) located at the late IIA–B assemblage (alias upper lagenide zone) in regional biostratigraphic scale. The event is recorded by J. transsylvanica Acme, matching with circa 1‰VPDB δ18O positive excursion. The event must have resulted in a considerable sea level drop – a trigger of the Moravian ecosystem demolition in the Paratethys environment.
Źródło:
Geological Quarterly; 2013, 57, 4; 757--768
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lingula dregeri (Brachiopoda) from the Middle Miocene of Hungary
Autorzy:
Bitner, M. A.
Dulai, A.
Kocsis, L.
Müller, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/191757.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Brachiopoda
Lingula
Middle Miocene
Pannonian Basin
Hungary
Opis:
Lingulide brachiopods, assigned to Lingula dregeri Andreae, 1893, have been identified from the Middle Miocene (Upper Badenian) of the Hungarian part of the Pannonian Basin. Although widely distributed in the Miocene of the Central Paratethys (Austria, Poland, Ukraine, Romania), the genus Lingula was not described previously from Hungary. Outside of the Central Paratethys, L. dregeri also has been recognized in the Atlantic and Mediterranean provinces and most probably in the Eastern Paratethys.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 1; 39--43
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Badenian zooxanthellate corals of the Medobory Hills (western Ukraine) and their environmental significance
Autorzy:
Górka, A.
Powiązania:
https://bibliotekanauki.pl/articles/191800.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
corals
scleractinians
palaeoenvironment
Badenian
Middle Miocene
Ukraine
Opis:
Zooxanthellate corals in the Badenian (Langhian to lower Serravallian) of western Ukraine occur in different lithofacies, but are most abundant in the upper Badenian coralgal reefs of the Ternopil Beds. The coral assemblage consists of five genera, with two predominant (Tarbellastraea and Porites) and three strongly subordinate (Favia, Heliastraea, Siderastrea). The present study is the first record of Heliastraea defrancei in the Fore-Carpathian Basin. The taxonomic composition of the corals indicates that their development occurred in conditions of some ecological stress, most probably connected with climate (location at the northern limit of coral distribution) and sedimentary environment (possible influx of terrigenous material). The coral assemblage shows similarities to numerous fossil reefs of Miocene age from the Paratethyan and Mediterranean realms.
Źródło:
Annales Societatis Geologorum Poloniae; 2018, 88, 3; 243-256
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strontium isotope composition of Badenian (Middle Miocene) Ca-sulphate deposits in West Ukraine: a preliminary study m
Autorzy:
Peryt, T. M.
Hryniv, S.
Anczkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/2059023.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Miocene
evaporites
strontium isotopes
gypsum
Paratethys
Opis:
Strontium isotope compositions have been measured in six primary gypsum samples from the most marginal part of the Badenian evaporite succession in the Ukrainian Carpathian Foredeep Basin (Mamalyha quarry section) and in two anhydrite samples from the basin-centre halite zone of the Ukrainian Carpathian Foredeep, aimed determining the origin of brines from which these sulphates were precipitated. The strontium isotope ratios (87868868761887 6878786
Źródło:
Geological Quarterly; 2010, 54, 4; 465-476
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coiling direction in Middle Miocene globorotaliids (Foraminiferida) : a case study in the Paratethys (Upper Silesia Basin, Poland)
Autorzy:
Gonera, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059350.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Miocene
Paratethys
foraminifera
globorotaliid
coiling direction
Opis:
The paper deals with sub-evaporite Badenian deposits (Middle Miocene, Paratethys) that display a sudden appearance of globorotaliid taxa showing preferences in the taxonomic set and coiling direction. An interval of sinistrally coiled Jenkinsella mayeri with proportionally coiled Globoconella bykovae is at the bottom of the studied sequence. It is followed by an interval of proportionally coiled Jenkinsella transsylvanica. Proportionally coiled Globoconella bykovae with a small number of proportionally coiled Jenkinsella transsylvanica are at the top of the Moravian (CPN 7) substage (Orbulina suturalis alias Lagenidae Zone). The sub-evaporite part of the Wielician (CPN 8) substage (Uvigerina costai alias Spiroplectammina Zone) began with a globorotaliid-barren interval (IIC biozone). It is followed by biozone IID displaying three globorotallid peaks amongst globorotallid-barren deposits. Only globoconellas are present in all these three events. Proportionally coiled Globoconella bykovae appeared first. It is followed by proportionally coiled Globoconella minoritesta and sinistrally coiled Globoconella bykovae at the end of the biozone IID. Coiling preferences of globorotaliids have been compared to changes in the hydrographic regime unfolding during the CPN 7 and CPN 8 in the studied area of the Paratethys. The study discovers that the coiling of globorotaliids responded selectively to the hydrographic changes. Globoconella bykovae is highly opportunistic and can tolerate considerable temperature changes. Specimens of this taxon persist to coil proportionally during the sub-evaporite Badenian, except for the shift to sinistral coiling just prior to the Wielician evaporites. Sinistrally coiled Jenkinsella mayeri is the most sensitive to hydrographic changes. This taxon retreated at the onset of the temperature drop during the mid-Moravian cryptic cooling. This cooling is marked by the new jenkinsellid occurrence – proportionally coiled Jenkinsella transsylvanica. Proportionally coiled Globoconella minoritesta is present in the middle of the IID globorotaliid peaks. The globorotaliid coiling data, presented in this paper, has been calibrated to the global stratigraphy. The integrated data (foraminifera, nannofossils, oxygen and carbon stable isotopes, radiometric measurements) supports the view that the CPN 7/CPN 8 boundary is coeval to the Langhian/Serravalian one. In the Polish part of the Carpathian Foredeep, the boundary runs within the Skawina Formation.
Źródło:
Geological Quarterly; 2018, 62, 1; 155--171
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotopic events in the Early/Middle Badenian (Miocene) of the Upper Silesia Basin (Central Paratethys)
Autorzy:
Gonera, M.
Bukowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2059404.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Miocene
Wielician
Paratethys
foraminifera
stable isotopes
Opis:
Middle Miocene foraminifera from the Skawina Formation of the Upper Silesia Basin have been analysed. The stable oxygen and carbon isotope signatures in Globigerinoides quadrilobatus (shallow pelagic), Globigerina bulloides (deeperpelagic) and Uvigerina spp. (benthic) tests show a temporal pattern of changes in the sections studied. The foraminiferal assemblage biozones of the Badenian that were identified earlier, on the basis of taxonomic composition, correspond to changes in the foraminiferal ẟI8O and ẟI3C values. The CPN7/CPN8 transition - as the Moravian/Wielician border - is marked by distinct isotopic events: a ẟ18O increase (IIAB/IIC boundary) followed by a ẟ13C decrease (IIC/IID boundary).
Źródło:
Geological Quarterly; 2012, 56, 3; 561--568
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielician (Middle Badenian) foraminifers from the stratotype area : Wieliczka Salt Mine, Poland (Paratethys, Middle Miocene)
Autorzy:
Gonera, M.
Wiewiórka, J.
d'Obyrn, K.
Bukowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2060050.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Middle Miocene
foraminifera
Wieliczka Salt Mine
Middle Badenian
Wielician
Opis:
The most abundant benthic foraminifers recorded in the Wielician salt-enclosed xenoliths are: Bulimina spp., Uvigerina spp., Valvulineria complanata, and Cibicides pseudoungerianus. The predominant taxon in the planktonic assemblage is Globigerina bulloides with a median 98.9% in biozone IIC and 89.1% in the later IID. The IIC assemblage differs from the IID one in both taxon composi tion and abundance. The most pronounced differences are those revealed by Valvulineria complanata counts, number of benfhic taxa and the plankfonic/benthic (P/B) rafio. Pseudotriplasia minuta (one of the Wielician index taxa) occurs only in the IID biozone, present in 16 among 28 samples. There is a noticeable difference in sur- face sculpture morphology pattern in the predominant Bulimina and Uvigerina taxa in the IIC versus the IID biozones. There are smooth (Bulimina elongata) and weakly striate (Uvigerina semiornata plexus) forms in the IIC biozone, foll owed by heavily costate (Bulimina striata) and spinose-pustu l ate (Uvigerina orbignyana plexus) forms in the IID. Globigerina druryi and G. decoraperta- the CPN 8 planktonic index taxa - had not been found in the material studied. Globigerinita uvula is un- usually common in the samples studied. The samples analysed display an abundance of Globigerina bulloides typical of the sub-evaporite Wielician. Hence the studied Wielician stratotype area supports the thesis of the Globigerina bulloides Acme as the valid name designation for the substage.
Źródło:
Geological Quarterly; 2014, 58, 3; 427--438
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 74

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