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    Wyświetlanie 1-7 z 7
    Tytuł:
    Homotryblium-dominated Eocene dinoflagellate cyst assemblages from Middle Miocene (Badenian) glauconitic sands at Lipowiec (Roztocze, SE Poland)
    Autorzy:
    Gedl, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059861.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Eocene
    Miocene
    reworking
    palaeoenvironment
    Roztocze
    SE Poland
    Opis:
    A section over 20 m thick of the basal Middle Miocene succession exposed at Lipowiec (Roztocze, SE Poland) was studied for palynology. Thirteen samples were collected from quartz and glauconitic-quartz sands and thin clay layers. Sand samples were barren but clay samples yielded dinoflagellate cysts. Their assemblages consist of reworked Paleogene specimens dominated by the Homotryblium floripes complex (H. floripes and morphologically similar H. plectilum and H. vallum). The presence of reworked Paleogene specimens indicates intense erosion of marine Paleogene strata during initial stages of the Middle Miocene transgression at Roztocze. Analysis of stratigraphical ranges of reworked dinoflagellate cysts and comparison with their occurrences in known epicontinental Paleogene sites of SE Poland suggest an Upper Eocene age of the washed-out strata. The taxonomic composition of the assemblages described suggests that the Upper Eocene deposits accumulated in a near-shore, lagoonal embayment characterized presumably by oligotrophic waters of slightly increased salinity. A high proportion of the Homotryblium floripes complex is also characteristic of reworked assemblages found in younger Miocene strata of neighbouring exposures in Roztocze, which indicates widespread Eocene lagoonal environments in this part of Roztocze. Coeval Eocene strata from the eastern part of Roztocze and from the Carpathian Foredeep show different taxonomic compositions suggesting varied sedimentary settings during Eocene transgression in this region. These differences reflect variable amounts of freshwater influence resulting in a range of environments that ranged from oligotrophic to brackish.
    Źródło:
    Geological Quarterly; 2016, 60, 2; 461--472
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reworked Eocene–Oligocene dinoflagellate cysts in the Miocene of the Carpathian Foredeep Basin : implications for Paleogene palaeogeography in SE Poland
    Autorzy:
    Gedl, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060511.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    dinoflagellate cysts
    reworking
    epicontinental Paleogene
    palaeogeography
    SE Poland
    Opis:
    Miocene strata of the Carpathian Foredeep Basin in Poland contain reworked Eocene and Oligocene dinoflagellate cysts, which come from two sources: the Flysch Carpathians and the epicontinental basin. The occurrence of the latter is almost the only trace of the epicontinental Eocene–Oligocene sedimentary cover, which extended across southwestern Poland, and is today nearly completely eroded. The distribution of epicontinental Eocene and Oligocene taxa in the Miocene strata of the northeastern part of the Carpathian Foredeep is uneven, clearly pointing to a limited extent of the host deposits and their variable erosion intensity. Erosion of the Eocene and Oligocene platform cover took place prior the Miocene transgression and took place also during the Badenian; its intensity increased during Late Badenian–Sarmatian tectonic movements, resulting in an increased frequency of reworked specimens in strata postdating the mid-Badenian deposits.
    Źródło:
    Geological Quarterly; 2012, 56, 4; 853--868
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Eocene dinoflagellate cysts from the Sołokija Graben (Roztocze, SE Poland)
    Autorzy:
    Gedl, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060470.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    dinoflagellate cysts
    biostratigraphy
    Eocene
    epicontinental basin
    Roztocze
    SE Poland
    Opis:
    The Sołokija Graben is a tectonic structure in Roztocze, the south-eastern Poland, unique by its infill with the Eocene marine strata. The over 40 metres thick sandy succession is the only well-dated palaeontologically trace of Eocene marine transgression at Roztocze being virtually the only remains of the Eocene epicontinental sea in this part of Poland: the surrounding area is devoid of coeval marine strata, which were eroded. This makes the Sołokija Graben succession crucial for the palaeogeography reconstruction of the south-eastern Poland during Eocene as well as the tectonic history of this region. For its precise age determination, the over 30-m-thick succession of loamy sands that fill the Sołokija Graben in a borehole at Leliszka and a 4-m-thick one at Łaszczówka were sampled for dinoflagellate cysts. Samples from Łaszczówka are barren, whereas the ones from Leliszka contain rich and taxonomically diverse assemblages. Their biostratigraphical interpretation confirms previous results suggesting the Bartonian age of the most of the Sołokija Graben succession; the postulated Priabonian age of its non-calcareous part was documented in its uppermost part only. Palynological record allows reconstruction of sedimentary setting of the Leliszka succession. Basal part of the Bartonian was deposited in a shallow but relatively vast marine basin characterized by normal salinity and high energetic hydrodynamic conditions. Subsequently, marine basin underwent gradual shallowing and temporal cease of sedimentation. During the late Bartonian basin became brackish. A short-lasting early Priabonian marine basin was characterized by shallow marine conditions; it became brackish during its final stage. Comparison with neighbouring Eocene deposits of the epicontinental and Carpathian basins shows that the marine basin at Roztocze was presumably connected with both during Bartonian, and separated from the Carpathian one during early Priabonian. Factors controlling seaways pattern of the Roztocze basin were either eustatics and substratum tectonic movements, the former dominating during Bartonian, and interfingering with uplift of the Meta-Carpathian Swell during early Priabonian.
    Źródło:
    Geological Quarterly; 2014, 58, 4; 707--728
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environment and man around Lakes Duba and Pelesa, SE Lithuania, during the Late Glacial and Holocene
    Autorzy:
    Stančikaite, M.
    Kabailiene, M.
    Ostrauskas, T.
    Guobyte, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059887.pdf
    Data publikacji:
    2002
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Lithuania
    SE Lithuania
    Holocene
    Late Glacial
    environmental changes
    human impact
    Opis:
    Interdisciplinary investigations (pollen and diatom analysis, 14C dating and geological-geomorphological and archaeological data) around Lakes Duba and Pelesa, in SE Lithuania, have elucidated the environmental history and human impact throughout the Late Glacial and Holocene. Aerial photograph interpretations indicate that both lakes are residual basins of one Post-Glacial palaeolake outside the morainic relief of the Nemunas (Weichselian) Glaciation. Pollen assemblages from lacustrine deposits date back to the Older Dryas (Lake Duba) and Alleröd (Lake Pelesa) and cover all chronozones of the Post-Glacial. Diatom analysis has illustrated the palaeoecological conditions in the lakes and helped reconstruct successive water levels throughout the last 12300 radiocarbon years. Diatom abundance and the distribution of the planktonic, benthic and epiphytic species suggest a lowering of Lake Duba and Lake Pelesa at (e.g.) 11900-10900 14C BP, (e.g.) 10000-8100 14C BP and (e.g.) 3700-2500 14C BP. Pollen data suggest that the earliest signs of human impact and local forest clearances data from about (e.g.) 8400-8300 14C BP. The first record of cereal pollen in sediments dates from earlier than (e.g.) 6000 14C BP. Therefore, agriculture was introduced into the area not earlier than the second half of the Midle Neolithic, at about (e.g.) 5000-4400 14C BP. Continous indications of agriculture and progressive clearing of woodland is consistent with the increasing role of a farming economy during the Bronze Age. Since the 1800-1900 14C BP formation of an open canopy, increasing soil erosion and changes in vegetation emphasize the remarkable human impact on the environment.
    Źródło:
    Geological Quarterly; 2002, 46, 4; 391-410
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Depositional environments of loesses from the Sandomierz section, SE Poland, based on lithological and SEM studies
    Autorzy:
    Kenig, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060219.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    SE Poland
    Sandomierz site
    loesses
    lithology
    quartz grains by SEM
    Opis:
    The litology of the Sandomierz section deposits have been examined, with SEM analysis performed on 4 quartz grain-size classes. All of the Sandomierz deposits contain predominant quartz grains with signs of aeolian transport. This refers both to morainic till and muds underlying the loess section as well to loesses them selves along with soil complexes. A much smaller, although significant contribution comprises redeposited grains with features of a high energy beach environment. Their content in creases up section. During sedimentation of the LMg (younger upper loess) deposits (later part of the Vistulian Glaciation) wind strength was in creasing. This is indicated by the upwards increasing content of coarser fractions within the interval, with simultaneously improved sorting, as well as by the increased contribution of garnets and the greater content of zircon and rutile at the top. The increasing contribution of aeolian quartz grains, the considerable content of grains redeposited from a beach environment and the decreasing amount of post-sedimentary features all suggest increased wind speed. Low variability in the shape of the 1–0.5 mm quartz grains from the LMg horizon indicates short transport and a similar nearby source of material. Alimentary areas for this horizon were composed of young Pleistocene muds and tills. A change in depositional conditions is observed at the LMs/LMg boundary (upper part of the Vistulian Glaciation). During deposition of the LMs (younger middle loess) horizon, wind strength decreased, as shown by the content of heavy minerals and the smaller mean grain-size along with the reduced content of aeolized quartz grains.
    Źródło:
    Geological Quarterly; 2008, 52, 2; 169-169
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diurnal variations and vertical distribution of δ13C, and concentration of atmospheric and soil CO2 in a meadow site, SE Poland
    Autorzy:
    Szaran, J.
    Dudziak, A.
    Trembaczowski, A.
    Niezgoda, H.
    Hałas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058901.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    SE Poland
    atmospheric CO2
    carbon dioxide concentration
    diurnal observations
    delta 13C
    soil CO2
    Opis:
    We provide the results of 24-hour observations made in a meadow site located in a small river valley in Central Europe. Samples of atmospheric air were taken from three horizons: near the soil (0.05 m), in the grass (0.5 m) and above the meadow (2 m) at two-hour intervals. At the same time, samples of soil air were collected from two horizons: -0.1 and -0.5 m. We have found a variation of δ13C above the ground from -6‰ during the day to -20‰ late at night accompanied by variations in CO2 concentration from 270 ppm during the day, to various levels late at night at different heights above the ground. The maximum concentration was 1430 ppm at the ground level. The correlation coefficient between δ 13C and reciprocal of concentration was the highest (R2 = 0.984) for the samples collected 2 m above the ground, the regression line clearly indicating CO2 mixing from the two sources: atmospheric and biogenic reservoirs. The intercept of the mixing line yields δC = -23.0‰ for the biogenic CO2. In contrast, the diurnal variations in the soil were relatively small, δ13C varied from -21.6 to -23.4‰, while CO2 concentration from 4300 to 8200 and from 24 700 to 34 500 ppm at depths of 0.1 m and 0.5 m respectively, which is less than 2-fold. Small diurnal variations are characteristic of dry soils, where δ13C is weakly correlated with CO2 concentration (in our case R2 was 0.30 and 0.54, respectively).
    Źródło:
    Geological Quarterly; 2005, 49, 2; 135--144
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iły krakowieckie jako wskaźnik litostratygrafii w dolinie rzeki Sopot na Roztoczu
    The Krakowiec Clays as an indicator of lithostratigraphy in the Sopot River valley in the Roztocze Region (estern Poland)
    Autorzy:
    Janiec, B.
    Czarnecka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074422.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    iły krakowieckie
    mikrofauna
    paleontologia
    litostratygrafia
    Roztocze
    Krakowiec clays
    microfauna
    paleontology
    residuum
    lithostratigraphy
    river valley
    Roztocze region
    SE Poland
    Opis:
    The results of micropaleonthological studies of the Sarmatian (upper Miocene) Krakowiec Clays from primary deposit as well as re-deposited ones were applied to the analysis of the stratigraphic profile of the Sopot valley fills. The study site was at the break section of the Sopot River valley in a contact zone of southern escarpment between the central part of the Roztocze and Sandomierz Basin regions (SE Poland). Species of fossil microfauna (foraminiferans, radiolarians), sponges and mollusks, as well as residual deposits were used. The documented, even if apparently small change in the lithostatigraphic profile of the Sopot valley fills, i.e., the presence of pre-Pleistocene deposits in its floor, is very important for the valley history and for interpreting other problems of river breaks and the Roztocze escarpment zone itself, e.g., sclae of the Holocene movements elevating the Roztocze Region, and their effect on expected intensity of deep fluvial erosion. In the sub-scarp zone of the Tomaszów Roztocze subregion the Krakowiec Clays occur rather shallowly. In the Sopot valley (‘Czartowe Pole’landscape preserve) they are in contact with calcareous formations. In two levels of natural clays’exposures, a dozen or so foraminiferan taxa were found. They were also below the primary deposit on the floor levels of the Sopot valley fills. The residuum of the studied strata consists of glauconite and pre-Pleistocene quartz sands, without silicate and alumosilicate, typical for postglacial formations. The Sarmatian clays present in residue were redeposited at least in the pre-Pleistocene. From the clays top up to the surface of valley fills, are Holocene deposits. The study revealed that: (1) during the Holocene and earlier the Sopot valley fills were not removed completely; (2) the floor of the valley is made not of the youngest, Holocene strata, but much older; (3) the presence of the Sarmatian microfauna in the alluvia allows to date the studied deposits as pre-Pleistocene (Pliocene?); (4) fine quartz sands and glauconite (a specific form of hydromica) both forming the residuum of the studied valley fill levels, together with the absence of other silicates and alumosilicates that are common in the Pleistocene formations, exclude the studied Krakowiec Clays from the group of glacial or fluvioglacial (Pleistocene) formations; (5) the youngest (latest Pleistocene –Holocene) movements elevating the Roztocze Region and the resulting deep fluvial erosion do not correspond with shallow occurrence of the pre-Pleistocene valley fills; this requires further discussion.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 10; 913-918
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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