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Wyświetlanie 1-15 z 39
Tytuł:
Geomorphology, sedimentology and origin of the glacigenic Złota Góra hills near Konin (Central Poland)
Autorzy:
Widera, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059142.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
sandur
end moraine
interlobate landform
Opis:
The Złota Góra hills (Central Poland) have been variously interpreted as a kame, a sandur and as different types of moraine. Due to their morphology and internal structure, the Złota Góra hills differ, however, from typical depositional glacigenic landforms in the European lowlands. Morphologically, the Złota Góra hills consist of numerous asymmetrical and oval hills of various sizes. The deposits show a wide variety of lithofacies, which are diagnostic for debris flows, hyperconcentrated flows, sheetfloods, braided rivers, deltas and ephemeral lakes. The combination of such deposits is characteristic of an environmental setting including both an end moraine fan (debris flows, hyperconcentrated flows, sheetfloods and ephemeral lake deposits) and a sandur (braided river, sheetfloods, and delta or ephemeral lake deposits). Therefore, these hills must be interpreted as representing an end moraine/sandur massif. The hills were probably formed subaerially by meltwater in an interlobate area of the retreating Scandinavian ice sheet.
Źródło:
Geological Quarterly; 2011, 55, 3; 253-268
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geotectonic significance of Carboniferous deposits NW of the Holy Cross Mts. (central Poland)
Autorzy:
Jaworowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/2059900.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
Carboniferous
debrites
turbidites
flysch
pseudoflysch
Opis:
Carboniferous sandstones and shales encountered in deep boreholes drilled in central Poland, NW of the Holy Cross Mts., represent a pseudoflysch i.e. they show facies features of flysch and, simultaneously, are of cratonic provenance. Clastic sediments were derived from a peripheral bulge formed within the East European Craton as a result of stresses exerted by the accretion/thrust wedge advancing up the marginal part of the craton. In central Poland, NW of the Holy Cross Mts., a Variscan foredeep existed. The foredeep was the depositional site of interfingering exo- and pseudoflysch which, from a geodynamic point of view, are equivalent to an outer molasse. Huge masses of Carboniferous deposits (generally corresponding to flysch) from southwestern and central Poland successively represent, moving from SW to NE, Variscan ortho-, exo- and pseudoflysch.
Źródło:
Geological Quarterly; 2002, 46, 3; 267-280
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotopic and Cladocera records of climate changes of Early Eemian at Besiekierz (Central Poland)
Autorzy:
Mirosław-Grabowska, J.
Niska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059552.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
palaeoclimate
Eemian Interglacial
cladocera
stable isotopes
Opis:
Results of stable isotope, Cladocera and pollen analyses of lacustrine sediments from Besiekierz (Central Poland) are presented. The Besiekierz palaeolake is located about 25 km north of Łódź (Central Poland) at 130 m a.s.l. The 4 m thick deposits comprise silty sands and clayey silts, overlain by calcareous gyttja and organic silts and peat. Pollen analysis documents that these deposits accumulated during the Eemian Interglacial and the Early Vistulian. Based on the results of stable isotope analyses, nine isotopic horizons (Is) were defined and characterized, and these enabled reconstruction of both climatic and hydrological changes. A positive trend in δ18O values and constant values of δ 13 suggest gradual climatic warming, while constant values of δ 18O and δ 13C indicate stable conditions and/or a fast rate of sedimentation. The fluctuation of isotopic values in the upper part of the succession probably points to a shallowing of the lake due to sedimentary infill. The subfossil cladoceran fauna in the Besiekierz succession is represented by 11 solely littoral species belonging to 3 families. Four zones of Cladocera development were distinguished. The Besiekierz palaeolake was a shallow reservoir. The initial period of its existence probably saw its greatest depth. The Cladocera species present indicate the initial oligotrophic status of the lake and its subsequent increase in trophic status.We compare the results of the isotopic, cladoceran and published palynological analyses, to distinguish and explain the phases of evolution of the lake.
Źródło:
Geological Quarterly; 2005, 49, 1; 67--74
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Tithonian Chitinoidellidae and other microfossils from Owadów–Brzezinki quarry (central Poland)
Autorzy:
Pszczółkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060991.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tithonian
microfossils
Central Poland
tyton
mikroskamieniałości
Polska Centralna
Opis:
Tithonian (= “Middle Volgian”) carbonate rocks are exposed in Owadów-Brzezinki quarry 19 km southeast of Tomaszów Ma-zowiecki, central Poland. In the upper part of the Sławno Limestone Member, chitinoidellids have been identified in thin sections from three samples, only. Therefore, the documented part of the Chitinoidella Zone in Owadów-Brzezinki quarry is about 0.3 m thick. The identified chitinoidellid taxa suggest that this assemblage represents the Upper Tithonian Boneti Subzone. The Chitinoidella Zone occurs at the top of Unit I and correlates with the uppermost interval of the Zarajskensis Horizon (Matyja, Wierzbowski, 2016). Other microfossils identified in the Chitinoidella Zone consist of Saccocoma sp. and benthic foraminifera of the genus Planularia. Calcareous dinoflagellate cysts (Cadosina semiradiata semiradiata Wanner and C. cf. semiradiata semiradiata Wanner) occur above the chitinoidellid assemblage, in the strata corresponding to the Gerassimovi Subzone of the Virgatus Zone (Matyja, Wierzbowski, 2016). Calcareous nannofossils are extremely rare in the thin sections studied; only one small specimen was seen, identified as Rhombolithion minutum (Rood et al., 1971) Young et Bown 2014. In contrast, microbial filaments are frequently observed in the studied thin sections. Their shape and pattern are reminiscent of some recent Cyanobacteria of the order Nostocales, however the Tithonian microbial filaments are much thinner.
Źródło:
Volumina Jurassica; 2016, 14, 1; 133--144
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palynology of biogenic sediments of the Eemian Interglacial at Bieganin near Kalisz, Central Poland
Autorzy:
Malkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2058816.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
Eemian Interglacial
pollen analysis
history of vegetation
Opis:
The paper presents palynological data from Bieganin, a village located near Kalisz, Central Poland, where organic sediments were deposited in a subglacial trough dating from the Wartanian Glaciation. The succession of vegetation is characteristic of the Eemian Interglacial. The pollen diagram indicates six local pollen assemblages: B1-Pinus-Betula, B2-Betula-Pinus-Ulmus, B3-Quercus-Corylus, B4 -Corylus, B5-Carpinus-Tilia-Polypodiaceae, B6-Pinus-Picea which correlate well with regional pollen assemblages obtained by Mamakowa (1989b) and Tobolski (1991). The plant succession in Bieganin started in the beginning of the Eemian (zone E1) and ended with the development of coniferous forest (zone E6). The profile does not include the final zone, E7, of the interglacial.
Źródło:
Geological Quarterly; 2003, 47, 4; 367-372
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyclic sedimentation in the Middle Jurassic of central Poland
Autorzy:
Dadlez, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059894.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
Middle Jurassic
stratigraphy
cyclic sedimentation
salt mobility
Opis:
Nine boreholes were drilled in the late eighties in central Poland to investigate the Middle Jurassic sedimentary successions. The boreholes were arranged in three lines (Ciechocinek, Brześć Kujawski and Wojszyce lines) running across three anticlines underlain by salt pillows. Long intervals of boreholes have been cored, often with 100% core recovery, thus enabling a detailed examination of sedimentary evolution. Sequences are composed of a full range of clastic rocks, from conglomerates through sandstones and heteroliths to shales. They are arranged in sedimentary cycles, predominantly regressive (coarsening upwards). These are interpreted as deposited in a shallow, wave/storm-dominated, shelf environment, each cycle being a result of progradation of fore-shore to near-shore heteroliths and sands over the shales of an open sea. The basin was probably non-tidal or microtidal. These essential (lower order) cycles, equivalents of the IVth order cycles in the world-wide scheme, are assembled in higher order cycles which resemble the IIIrd order cycles of that scheme. The bases of the higher order cycles are good lithostratigraphic markers, three of them being probably equivalents of chronostratigraphic boundaries (bases of the upper Aalenian, upper Bajocian and Bathonian, respectively). Correlation of borehole sections points to limited salt movement of the Ciechocinek and Wojszyce salt pillows during the Middle Jurassic. These are indicated, first of all, by thickness reductions seen in boreholes located above the tops of salt pillows. In the Ciechocinek area, the upward movement of salt occurred during the latest Bajocian/earliest Bathonian while in the Wojszyce area - during the early Bathonian. Coarser clastics were shed into the basin from the south-west, north-west (along the Mid-Polish Trough) and north-east during the Aalenian, and mainly from the north-east (from the East European Craton) in later times.
Źródło:
Geological Quarterly; 2002, 46, 3; 321-336
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new Eemian Interglacial to Early Vistulian site at Łanięta, central Poland
Autorzy:
Balwierz, Z.
Roman, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059929.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
Eemian Interglacial
Early Vistulian
lake sediments
palynostratigraphy
Opis:
The Łanięta site with fossil lake deposits is situated just in front of the maximum extent of Vistulian Glaciation ice. Palynological analysis shows that lake accumulation lasted through the Eemian Interglacial and almost the whole Early Vistulian, the longest record of this time interval in this part of Poland. Two warm interstadial-rank oscillations (Brörup and Odderade) and two stadials have been distinguished during the Early Vistulian. The older of these is correlated with the Herning Stadial while younger one equates with the Rederstal Stadial of the German succession.
Źródło:
Geological Quarterly; 2002, 46, 2; 207-218
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The relationship between the chemical composition and lithology of Late Glacial and Holocene biogenic deposits of the Żabieniec mire (Central Poland)
Autorzy:
Okupny, Daniel
Borówka, Ryszard Krzysztof
Forysiak, Jacek
Twardy, Juliusz
Kloss, Marek
Żurek, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2058726.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
kettle hole
limnogenic mire
geochemistry
macrofossils
denudation
Central Poland
Opis:
Geochemical and plant macrofossil analyses of the Żabieniec mire deposits and the palaeoenvironmental changes they record of the past several thousand years constitute an important source for palaeogeographical reconstruction of the Polish Lowland. We describe the phases of the basin’s development from the final part of the Plenivistulian (MIS2), through the Late Glacial and the entire Holocene, encompassing changes determined by both regional and global factors in the surrounding environment, and habitat transformations in the limnogenic mire. The kettle-hole infill of the Żabieniec mire is the only documented example in Central Poland of a succession of biogenic deposits exceeding 10 m in thickness in such a setting. Deposition initially took place in a lake environment, which led to a shallowing of the lake that persisted until the end of the Mesoholocene.
Źródło:
Geological Quarterly; 2021, 65, 1; 11
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the sedimentary environment of phytogenic deposits in the Tomisławice opencast mine (Konin Region, central Poland)
Autorzy:
Słodkowska, Barbara
Widera, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2201200.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Palynology
lignite seam
plant communities
palaeofloristic reconstruction
Neogene
central Poland
Opis:
Palynological analysis of the Tomisławice opencast mine deposits has allowed reconstruction of the plant communities and investigation of the evolution of sedimentary environments at various stages of lignite-forming marsh development, recorded in the composition of pollen assemblages from deposits of the 1st Mid-Polish lignite seam (MPLS-1). Rich pollen communities from an ~9 m thick section has enabled study of the succession of plant communities and of the evolution of phytogenic sedimentation. The pollen succession indicates that the assemblages in the whole lignite seam represent the VIII Celtipollenites verus pollen Zone. Slight differences in the composition of the communities reflect different stages of basin development, depending more on the variable water dynamics than on climatic oscillations. Lignite of the MPLS-1 developed in a continental regime on alluvial plains. Changes in the succession of plant communities in the Tomisławice section record flooding-drainage cycles caused by groundwater level oscillations. Peat bog accumulation took place in river basins, in which the lack of siliciclastic intercalations within the massive lignite seams points to weak fluvial dynamics. A rise in groundwater level and/or surface water resulted in flooding of the marshes and the formation of an extensive shallow lake basin, as shown by the presence of freshwater algae and pollen of aquatic plants. The section as a whole does not record an increased contribution of thermophilic plant taxa. The flora was generally dominated by warm-temperate and thermophilic species, without the participation of strongly thermophilic vegetation, which indicates that the lignite seam in the Tomis³awice opencast mine was formed in the generally stable conditions of a warm temperate climate.
Źródło:
Geological Quarterly; 2022, 66, 4; art. 66, no. 34
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upper Pleistocene palaeoenvironmental changes at the Zwierzyniec site, Central Poland
Autorzy:
Kalińska-Nartiša, E.
Dzierżek, J.
Bińka, K.
Borkowski, A.
Rydelek, P.
Zawrzykraj, P.
Powiązania:
https://bibliotekanauki.pl/articles/2059945.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pollen
plant macrofossils
glaciolacustrine
Eemian–Vistulian sequence
palaeoenvironment
Central Poland
Opis:
The paper presents the data on an Eemian–Late Glacial sedimentary sequence from the Zwierzyniec site, central Poland. A number of boreholes document one or two organic layers that occur beneath one or two horizons of clayey and silty deposits of ice-dammed lakes. This study demonstrates to which extent the Zwierzyniec site can contribute to a better understanding of the palaeoenvironmental changes during the Eemian–Vistulian time-frame in central Poland. To study it, a multi-proxy approach was applied, involving: palynological and plant macrofossil analysis, study of rounding of quartz grains and morphology of their surface, and investigations of sand mineralogy and till petrography. The results show that a till bed is overlain by a sandy series corresponding to the glacial-interglacial transition. Either one or two distinct peaks of organic accumulation are evidenced by peat horizons. The lower horizon records spectra with hazel and hornbeam, and did, therefore, accumulate in the Eemian. Observed only in some boreholes, the upper peat horizon marks the Brørup (or the lower part of the Rederstall stadial) represented by forest-steppe conditions with patchy mosaics of larch and further transition into sedges and herbaceous taxa. Localized in between the two peat sequences, the sandy horizon marks a long-lasting aeolian transformation with weathering by frost in the Early Vistulian. Again, significant changes of the palaeoenvironmental regime occurred, and are manifested in the one or two horizons of the glaciolacustrine sediments. This corresponded to the last glaciation in the region, when the ice-dammed lakes formed during the Main Stadial.
Źródło:
Geological Quarterly; 2016, 60, 3; 610--623
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mesozoic thickness pattern in the Mid-Polish Trough
Autorzy:
Dadlez, R.
Powiązania:
https://bibliotekanauki.pl/articles/2058886.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
western and central Poland
Mid-Polish Trough
Mesozoic thickness
tectonics
palaeogeography
Opis:
The Mid-Polish Trough (MPT) is well recorded in the distribution of thickness of the Mesozoic sediments. Its shape was most distinctly delineated in the Early Triassic, and Early to Middle Jurassic, when thickness gradients attaining 100 m/km were reached. However, because the regional faults bordering the MPT were not active throughout its history, the existence of Mid-Polish Rift has not been confirmed. The strongest thickness gradients may have been caused by the periodical activity of the sub-Zechstein faults, which did not penetrate the Mesozoic strata due to the damping effect of plastic Zechstein salts. On the contrary, local faults, forming (mainly during the Late Triassic) syn-sedimentary grabens, are a common feature in the MPT and its surroundings. Transversal subdivision of the MPT and its slopes into at least two segments (Pomeranian and Kuiavian) is clearly visible in the thickness pattern. It is expressed by the presence of separate depocentres, reversal of asymmetry, differences in stratigraphical sequences observed on the palaeomorphological terraces south-west of the MPT, and by the structural variations after the inversion. The scale of inversion, which transformed the MPT into the Mid-Polish Swell (MPS), is unclear and needs further investigations. Estimation of the thickness of the Upper Cretaceous sediments removed by erosion is a key problem in this respect. It should take into account both, the effects of the regional inversion and the local changes resulting from the last stage of strong salt displacements.
Źródło:
Geological Quarterly; 2003, 47, 3; 223-240
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Origin and Neoholocene evolution of spring-fed fens in Wardzyń, Łódź Upland, central Poland
Autorzy:
Dobrowolski, R.
Ziułkiewicz, M.
Okupny, D.
Forysiak, J.
Bałaga, K.
Alexandrowicz, W. P.
Buczek, A.
Hałas, S.
Powiązania:
https://bibliotekanauki.pl/articles/2060368.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
spring-fed fen
calcareous tufa
peatland
Neoholocene
Łódź Upland
Central Poland
Opis:
Spring-fed fens in Wardzyń represent the rare group of alkaline mires supplied by artesian groundwater. Using multidisciplinary methods (including sedimentological, hydrometric and hydrochemical, pollen, macrofossil, malacological, geochemical, radiocarbon dating, and stable oxygen and carbon isotope analyses) we have been able to (1) reconstruct the main phases of spring-fed fen development, and to (2) determine the cause of Neoholocene groundwater ascension responsible for the mire inception. These phases are characterized by cyclic organic (peat) and carbonate (tufa) sedimentation associated with the Holocene fluctuations in humidity and temperature. The beginning of the activation of hydrological systems (involving the flow of confined groundwater of the Cretaceous aquifer) at Wardzyń occurred in the Subboreal period of the Holocene, after a long episode of decreased humidity initiated ca. 4.2 ka cal BP.
Źródło:
Geological Quarterly; 2017, 61, 2; 413--434
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeobotanical record of the Eemian Interglacial succession at the Jagodne site (Garwolin Plain, central Poland)
Autorzy:
Bober, Aleksandra
Brzozowicz, Dorota
Drzymulska, Danuta
Żarski, Marcin
Suchora, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2059599.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Eemian Interglacial
MIS-5e
Garwolin Plain
central Poland
palynology
plant macrofossils
Opis:
Our high-resolution data of pollen and macrofossils from 2 cores taken from the Jagodne site (Garwolin Plain) reveals a pollen succession covering the final part of the Late Saalian (Marine Isotope Stage MIS 6) and embracing the Eemian (MIS 5e). The results correspond to Regional Pollen Assemblage Zones (RPAZ). The hornbeam phase (E5 RPAZ) has been subdivided into subzones and compared to the corresponding division of the key profile of the Garwolin Plain, Kozłów K2-19. The comparison revealed a considerable sedimentary hiatus in the E5 RPAZ at Jagodne. This is attributed to significant palaeohydrological changes occurring widely in this zone, and also seen at other Eemian sites in Poland. Another specific feature of the Jagodne site is the early, rapid terrestrialisation of the palaeolake and its transformation into a raised bog, which occurred already at the end of the hornbeam phase. The Sphagnum dominated peatbog developed for a long time as evidenced by a thick peat layer covering also the Early Vistulian. Both pollen and plant macrofossil data correspond well to observed lithological boundaries, providing a consistent record of palaeoenvironmental and palaeoclimate changes. The results obtained contribute to knowledge of palaeoenvironmental changes and palaeoclimate interpretation of that area.
Źródło:
Geological Quarterly; 2021, 65, 2; 65: 34
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental changes during the MIS 6a–MIS 5e transition : the Parchliny 2016 profile, central Poland
Autorzy:
Majecka, Aleksandra
Wachecka-Kotkowska, Lucyna
Krzyszkowski, Dariusz
Malkiewicz, Małgorzata
Mirosław-Grabowska, Joanna
Niska, Monika
Rzodkiewicz, Monika
Myśkow, Elżbieta
Tomaszewska, Klara
Wieczorek, Dariusz
Raczyk, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2201209.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Eemian interglacial
glacial-interglacial transition
lacustrine deposits
Late Saalian
palaeoenvironment
central Poland
Opis:
We describe the penultimate glacial – last interglacial transition from the one of the numerous palaeolake successions in central Poland, which have yielded many documented Eemian and Early Weichselian floral records. In the new profile, Parchliny 2016, the lacustrine deposits were analysed lithologically, botanically, zoologically, and geochemically, providing new data that illustrate the environmental transition from the Late Saalian (MIS 6a) to the Eemian interglacial (MIS 5e). Five phases of palaeolake development have been distinguished. The first phase was related to the rapid melting of a dead ice block buried in the tills to form a lake. The second phase documented a Late Saalian initial succession, with the dominance of open steppe communities (Stadial 1), followed by a third phase with gradual increasing density of vegetation, the spread of boreal forests (Zeifen interstadial) and further increase in open communities and the retreat of pine (Kattegat stadial). The fourth phase reflected the beginning of Eemian interglacial by the expansion of pioneering birch-pine and purely birch forests and an increasing proportion of deciduous trees, including oak (Vth phase). Diatom, cladoceran and geochemical studies indicate at least two stages of lake development. The first stage (Late Saalian) was of an open lake (2–4 m deep), in relatively cold conditions and nutrient-poor water with the lowest amounts of organic carbon and nitrogen. The second stage (Eemian interglacial), shows warmer, shallower conditions in which the lake’s primary production increased, the water was well oxygenated, and there were more trophic levels.
Źródło:
Geological Quarterly; 2022, 66, 4; art. 66, no. 31
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Łysogóry Unit (Central Poland) versus East European Craton - application of sedimentological data from Cambrian siliciclastic association
Autorzy:
Jaworowski, K.
Sikorska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2058939.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
East European Craton
Cambrian
passive margin
siliciclastic association
Caledonian deformations
Opis:
TheMiddle and Late Cambrian deposits of the Łysogóry Unit and the Early and Middle Cambrian deposits of the East European Craton form part of an extensive siliciclastic sedimentary prism that was deposited on a tide and storm influenced continental shelf. In SE Poland, the proximal part of the Cambrian passive margin sedimentary prism of the East European Craton (Baltica) corresponds to the Łysogóry Unit whereas the NE part of the Małopolska Massif is thought to represent its distal part. Based on sedimentological criteria, the Cambrian siliciclastic association appears to indicate that the Łysogóry Unit and Małopolska Massif were not detached from Baltica during the breakup of the Precambrian Rodinia supercontinent, thus casting serious doubt on the exotic terrane nature of the Holy Cross Mts. Neither the Łysogóry Unit nor the Małopolska Massif are terranes in so far as they were not subject to lateral translations along the margin of Baltica. The Cambrian phases of Caledonian deformations in the Holy Cross Mts. may be explained in terms of rotational block movements controlled by large-scale listric normal faults dipping off the craton.
Źródło:
Geological Quarterly; 2006, 50, 1; 77-88
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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