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Wyświetlanie 1-15 z 57
Tytuł:
Palaeoecology of the Holsteinian lake in vicinity of Wilczyn (eastern Poland) based on molluscan studies
Autorzy:
Szymanek, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060329.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
palaeoecology
molluscs
Holsteinian
lacustrine sediments
Opis:
Malacological studies of two profiles of the Holsteinian (Mazovian) Interglacial from eastern Poland – Roskosz and Wilczyn 1/12 – are presented. They are connected with the northern part of the Wilczyn palaeolake and seems to document palaeoecological changes in the part of the climatic optimum and the post-optimal period. Mollusc communities are typical of lake environs. The latter is supported by biometry of Pisidium moitessierianum. Higher energy conditions are evidenced by rheophile species P. henslowanum and P. nitidum in the lowermost part of the Roskosz section. Mollusc assemblages with Lithoglyphus jahni, with Valvata piscinalis and Bithynia tentaculata as well as with Valvata piscinalis are distinguished at Roskosz. They record changes in aquatic vegetation and depth conditions. Malacofauna from Wilczyn 1/12 is dominated by V. piscinalis, V. piscinalis f. antiqua and B. tentaculata. Limited contribution of temperate gastropods Viviparus diluvianus and L. jahni as well as the occurrence of some cold-loving forms indicate a deterioration of thermal conditions. Shallow-water habitats and expansion of reed zones are inferred from proportions of Bithynia shells and opercula.
Źródło:
Geological Quarterly; 2013, 57, 4; 637--648
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ostracoda of the Eemian Interglacial at Kruklanki in NE Poland
Autorzy:
Namiotko, Tadeusz
Szczechura, Janina
Namiotko, Lucyna
Powiązania:
https://bibliotekanauki.pl/articles/2027451.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NE Poland
Eemian Interglacial
lacustrine chalk
ostracods
Opis:
The assemblage of lacustrine ostracods found in the Eemian Interglacial sediments at Kruklanki (Masurian Lake Dis- s q trict, northeastern Poland) contains 18 species belonging to 13 genera. The most dominant species are Candona neglecta Sars, 1887, Limnocytherina sanctipatricii (Brady et Robertson, 1869), Limnocythere inopinala (Baird, 1843) and Candona candida (O.F. Muller, 1776). Cyclocypris serena (Koch, 1838), llyocypris decipiens Masi, 1905, Pseudocandona insculpta (G.W. Muller, 1900) and Leucocythere mirabilis Kaufmann, 1892 are recorded for the first time from the Eemian of Poland; the latter two species are also new for the Eemian lacustrine deposits of Europe. The ecological requirements of the recognised ostracod species as well as their geographic ranges in the Quaternary of Europe are summarised. Based on these data, past habitat type is estimated as a deeper littoral of a lake with reasonably cold, well-oxygenated and calcium-rich waters. The present state of knowledge of the Eemian ostracods from Poland is reviewed and their comparison with the Eemian ostracod assemblages from Europe is briefly given. Comparison of the ostracod fauna! assemblage from Kruklanki with those from other Eemian sites in Poland enables to establish and describe one general type of ostracod assemblages characteristic for lacustrine littoral in this interglacial.
Źródło:
Studia Quaternaria; 2003; 3-24
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in the development of the Szczecin Lagoon area in the Late Glacial and Holocene based on the geochemical analysis of carbonate sediments from Lake Nowowarpieńskie (NW Poland)
Autorzy:
Strzelecka, Agnieszka
Wróbel, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/2037033.pdf
Data publikacji:
2021-12-23
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
lacustrine chalk
geochemistry
energy dispersive spectroscopy
Littorina transgression
Opis:
This paper presents the results of geochemical analysis performed for the more-than-10-m-long core of sediments derived from Lake Nowowarpieńskie. Contrary to what its geographical name would suggest, it is in fact a peripheral bay  of the Szczecin Lagoon (NW Poland). A characteristic feature of the sedimentary cover of this water body is the several-metre-thick layer of lacustrine chalk, which is unique in the lithology of the sediments of today's Szczecin Lagoon. This sediment has been analysed using atomic absorption spectrometry (AAS), energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) imaging. The chalk sediment from Lake Nowowarpieńskie is of chemical origin, bearing no fragments of vascular plants, but only traces of C-org in the form of small plant remains. The analysis of individual crystals using the EDS method also show Ca contents of over 99%. SEM images reveal that the sediment is characterised by a loose, disordered pack-ing of individual crystals, often combined to form aggregates with a tabular structure. The individual calcite grains are usually a few micrometres in size, while developed ones are mostly hypidiomorphic and show signs of corrosion. The sedimentation of the lacustrine chalk indicates that the post-glacial natural development of this part of what today constitutes Szczecin Lagoon differed from that of the rest of the lagoon. This sediment was deposited in a shallow but fertile isolated lake. The full profile of sediments from Lake Nowowarpieńskie reveals its distinct bipartite character, indicating two main stages of its evolution: carbonate and post-carbonate. In the first, the water body showed similarities to the neighbouring lakes of the Wkrzańska Plain. Its evolution was driven by climatic factors. The second stage was initiated by a palaeohydrological factor – Littorina transgression, which resulted in the lake being included into the hydrological system of the Szczecin Lagoon.
Źródło:
Acta Geographica Lodziensia; 2021, 111; 47-57
0065-1249
Pojawia się w:
Acta Geographica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TL age of Upper Pleistocene stratified deposits measured using the additive, regeneration and R_ methods
Autorzy:
Fedorowicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/2058930.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Lithuania
Pleistocene
thermoluminescence
TL age
laminated lacustrine sand
Opis:
Stratified sands, which are components of the glacial and interglacial Vilkišks and Tartokai profiles (Lithuania), were used as research material for experimental dating with the TL method. Sieve analyses of samples collected from stratified sands show varying grain-sizes in the samples, with domination by different fractions indifferent samples. Four aliquot of grains of the same diameter were selected from each sample for further research by means of the additive, regeneration and R methods. The results showed some consistent patterns, which suggest a direction that future studies could take on these deposits samples. It is necessary, though, to examine grains which comprise a substantial percentage share in the total sample mass.
Źródło:
Geological Quarterly; 2006, 50, 2; 211-218
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skutki spowolnienia przekształcania siedlisk hydrogenicznych w wyniku zaniechania eksploatacji kredy jeziornej
Consequences of the decrease of hydrogenic sites transformations as a result of discontinuation of lacustrine chalk exploitation
Autorzy:
Lemkowska, B
Powiązania:
https://bibliotekanauki.pl/articles/399517.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
retardacja
kreda jeziorna
wapnowanie
retardation
lacustrine chalk
liming
Opis:
Największe wydobycie kredy jeziornej (3,5 mln t • rok-1) miało miejsce w latach 90-tych XX, kiedy transport nawozów wapniowych był dotowany. Od momentu zaniechania wsparcia finansowego dla producentów, wydobycie kredy zostało zahamowane. Aktualnie wydobycie ma miejsce tylko na jednym obiekcie spośród 176 udokumentowanych złóż. Jego zasoby bilansowe 165 tys. ton są pomniejszane rocznie o 16 tys. ton. Zaniechano wydobycia na 68 obiektach, przy czym w 7 przypadkach wyeksploatowano złoże. Wstrzymanie eksploatacji spowodowało zmniejszenie zużycia nawozów wapniowych z 200 kg CaO do 37 kg • ha-1 • rok-1. Tereny poeksploatacyjne tylko częściowo zrekultywowano, formując zbiorniki wodne, zalesiając, tworząc antropogeniczne grunty orne. Część pozostawiono bez uporządkowania terenu, porzucając elementy infrastruktury wykorzystywanej podczas eksploatacji. Dawne mokradła zostały przekształcone geomechanicznie i są wykorzystywane jako nielegalne wysypiska śmieci. Retardacja eksploatacji zasobów kredyjeziornej zapewnia zachowanie złóż, prolongatę funkcjonalności ekosystemów w stanie utrzymaniaświadczonych przez nie usług. Wiąże się również z zaniechaniem wapnowania gleb i negatywnymi skutkami postępującego ich zakwaszenia.
The greatest exploitation of lacustrine chalk (3.5 million t per year) was noted in the 90. of 20th century when the transport of calcareous fertilizers was subsidized by the government. Since the financial support was desisted, the excavation of the chalk was stopped. Now, the excavation of chalk takes place only at one site, among 176 documented ones. Its resources of 165,000 t are decreased by 16,000 t every year. The exploitation was stopped at 68 sites, among which seven were completely exploited. The reduction in exploitation resulted in decreasing calcareous fertilization from 200 kg CaO to 37 kg CaO per hectare per year. After exploitation, these areas were partly reclaimed andtransformed into water bodies, forests, anthropogenic arable lands. Some areas were left unarranged with parts of infrastructure used during exploitation. Former wetlands were geomechanically transformed and are used as illegal landfills. Retardation of lacustrine chalk exploitation saves the deposits and maintains the ecosystem functions. It is also associated with decreasing soil liming and negative effects of acidification.
Źródło:
Inżynieria Ekologiczna; 2013, 34; 173-180
2081-139X
2392-0629
Pojawia się w:
Inżynieria Ekologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sustainable Development of the Urban Agglomeration through the Creation of an Urban Network of Protected Areas: Case Study of Kyiv City Urban Ecosystem
Autorzy:
Radomska, Margaryta
Cherniak, Larysa
Horobtsov, Innokentii
Kolotylo, Olexandra
Powiązania:
https://bibliotekanauki.pl/articles/1391000.pdf
Data publikacji:
2018
Wydawca:
Wyższa Szkoła Bankowa w Poznaniu
Tematy:
urban environment
eco-network
protected areas
lacustrine ecosystem
Opis:
The need for improvement of the environment quality at the territory of cities is directly conditioned by its impact on the health of humans. At the same time humans are not the only residents of urban ecosystems, but they are also inhabited by other organisms, using city as their habitat. The growth of cities is a stable trend of the modern times and it comes into conflict with wildlife living activity and quality of environment. Sustainable development of cities is impossible without environment protection, economic progress and benefits for local communities, therefore the creation of protected areas groups within the city of Kyiv is offered as an instrument for biodiversity support and urban ecosystem stabilization. The most important requirements to the sites to be included into the system of protected areas have been formulated. The first two cores are developed based on small lakes, which are characterized with environmental, recreational and wildlife support potential. The benefits from the creation of the urban network of protected areas have been defined for urban ecosystem and social and economic situation in the city.
Źródło:
Studia Periegetica; 2018, 24(4); 59-75
1897-9262
2658-1736
Pojawia się w:
Studia Periegetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lacustrine chalk deposition in Lake Kruki in (NE Poland) as a result of decalcification of the lake catchment
Autorzy:
Gąsiorowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2026786.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Kruklin Lake
lacustrine chalk
decalcification
Holocene
NE Poland
Opis:
Lacustrine chalk is very common in post-glacial lakes of northern Poland. In the deposit of Lake Kruk lin (NE Poland) carbonates occur as a layer 2-3 m thick. Samples for laboratory studies were collected from three profiles in SW part of the deposit. Mineral composition of the sediments was determined using differential thermal analysis (DT A) and thermogravimetry analysis (TGA), while the age was determined on the basis of pollen analysis. The sediment profiles represent an age of early Holocene. Calcite is the major component of lacustrine chalk. It forms small crystals (
Źródło:
Studia Quaternaria; 2001, 18; 17-24
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The significance of subfossil Cladocera in stratigraphy of Late Glacial and Holocene
Autorzy:
Szeroczyńska, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/2027068.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stratigraphy
“ecostratigraphy” – biostratigraphy
climate
lakes
lacustrine sediments
subfossil Cladocera
Opis:
This pa per pres ents dis cus sion on the re sults of sub fos sil Cla do cera analy ses from five lakes in Po land (Przedni Staw Lake, Per es pilno Lake, Gooeci¹¿ Lake, Imio³ki- fossil lake and Os trow ite Lake). The Cla do cera are rep re sented in sediments by re mains of plank tonic (Bos mini dae, Daph ni dae) and lit to ral (Chy do ri dae) forms. Cla do ceran as sem blage phases (“ecos tra tigra phy”) were de ter mined on the ba sis of changes in domi nance of in di ca tor spe cies and past ecologi cal con di tions were re con structed. The re sults are be ing dis cussed from the view point of cli mate change and anthro po genic ac tiv ity and their role in the lake evo lu tion. Moreo ver, an at tempt to use the cla do ceran phases for stra tigraphic di vi sion of the Late Gla cial and Holo cene was made. Dur ing the Bøl ling/Al lerød in ter sta dial, dis tin guished on the ba sis of pol len analy sis, Cla do cera in di cated short phase of bad con di tion (dry or cold?), proba bly as the Old Dryas cli mate re sults. The be gin ning of Holo cene is char ac ter ized, in moun tain and low land lakes, by high in -crease in the number of spe cies and speci mens of Cla do cera. This de scribed clear warm ing and marked the bound ary Late Gla cial/Holo cene. It was in di cated that the “ecos tra tigra phy” based on Cla do cera can be use ful for cli ma to stratigra phy, if cli mate was the ma jor fac tor con trol ling the de vel op ment of fresh wa ter lakes.
Źródło:
Studia Quaternaria; 2006, 23; 37-45
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scrutinizing Barremian coprolite inclusions to record digestive strategies
Autorzy:
Barrios-de Pedro, S.
Buscalioni, Á. D.
Powiązania:
https://bibliotekanauki.pl/articles/191206.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Cretaceous
Las Hoyas
lacustrine
taphonomy
digestive process
feeding ecology
Opis:
The exceptional preservation of the Las Hoyas coprolites allows the taphonomic study of inclusions on twelve morphotypes and twenty-three specimens. Non-destructive techniques were applied to study the digestion features (pitting, corrosion lines, shape of the fractures at the ends) and the arrangement, number, and size of inelusions. An analysis based on non-metric, multidimensional scaling ordination identified the similarities among the inclusion features and morphotypes. The morphotypes are clustered on the basis of the way of ingestion and the digestive process. The authors recognize three digestive strategies for the Las Hoyas coprolites: (1) ingestion of prey with limited processing in the mouth, scarce to less effective acid secretions, and/or defecation in a short period of time; (2) ingestion of the prey with mastication prior to deglutition, and defecation over a longer period of time; (3) mastication and long retention time of food in the digestive system with more effective acid secretions. This study is a first step in the understanding of the feeding ecology of the Las Hoyas Barremian lentic ecosystem, based on coprolites.
Źródło:
Annales Societatis Geologorum Poloniae; 2018, 88, 2; 203-221
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organic geochemical study of the Lower Miocene Kremna Basin, Serbia
Autorzy:
Perunović, T.
Stojanović, K.
Simić, V.
Kašanin-Grubin, M.
Šajnović, A.
Erić, V.
Schwarzbauer, J.
Vasić, N.
Jovančićević, B.
Brčeski, I.
Powiązania:
https://bibliotekanauki.pl/articles/191854.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Kremna Basin
lacustrine sediments
organic matter
mineralogy
biomarkers
pyrolysis
Opis:
The Kremna Basin is located in southwest Serbia, in the Zlatibor area, which is part of the Internal Dinarides. This basin is noteworthy because of the type of bedrock drainage, which it represents. It was formed on ultrabasic rocks and volcanic materials that influenced the occurrence of organic matter (OM) in the basin fill. The objective of the study was to determine the organic geochemical characteristics of sediments from the central part of the Kremna Basin. The sediments studied belong to an intrabasinal facies, in which two sequences were distinguished. The lower sequence occurs at depths of 216–343 m, while the upper sequence is found from 13.5–216 m. At the start of basin development (265–343 m) sedimentation took place in shallow alkaline water, rich in Mg ions. Through time, a slight deepening of the basin occurred. This was followed by chemical deposition of carbonates (216–265 m). The most important change in the sedimentary environment occurred with the formation of sediments marking the transition between the sequences (at about 200 m). Sediments from the lower sequence are characterized by the dominance of dolomite and magnesite. There are indications of volcanic activity, i.e. tuff layers and the presence of searlesite. The upper sequence is characterized by the prevalence of calcite and dolomite. The amounts of MgO, Na2O and B are higher in the lower sequence, whereas the CaO content is higher in the upper sequence. The sediments contain different amounts of immature OM (late diagenesis). Biomarker analysis shows diverse precursors of the sedimentary OM: methanogenic archaea, photosynthetic green sulfur bacteria (Chlorobiaceae), bacterivorous ciliates, various bacteria, both photosynthetic and non-photosynthetic, the green unicellular microalga, Botryococcus braunii race A (exclusively in the upper sequence) and terrestrial plants. The lower sequence contains lower amount OM, composed primarily of kerogen II/III and III types, indicating a higher contribution of the allochtonous biomass of land plants from the lake catchment, particularly in the lower part. The sediments of the upper sequence are enriched in autochthonous aquatic OM, which comprises mostly kerogen I, I/II and II types. The transition from the lower sequence to the upper one is associated with a decrease in pristane to phytane ratio, gammacerane index and content of C28 steroids, absence or significantly lower amount of squalane, absence of C24 and C25 regular isoprenoids, 8-methyl-2-methyl-2-(4,8,12-trimethyltridecyl) chroman and C30 hop-17(21)-ene. Pyrolytic experiments showed that the sediments of the upper sequence, rich in aquatic OM, at a catagenetic stage could be a source of liquid hydrocarbons. The values of hopane, sterane and phenanthrene maturation parameters indicate that through pyrolysis at 400°C the samples investigated reached a value of vitrinite reflectance equivalent of approximately 0.70%. It was estimated that the sediments should be found at depths of 2300–2900 m in order to become active source rocks. The calculated minimum temperature, necessary for catagenetic hydrocarbon generation, is between 103 and 107°C.
Źródło:
Annales Societatis Geologorum Poloniae; 2014, 84, 3; 185-212
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pedogenic and lacustrine features of the Brushy Basin Member of the Upper Jurassic Morrison Formation in western Colorado: Reassessing the paleoclimatic interpretations
Autorzy:
Tanner, L.
Galli, K.
Lucas, S.
Powiązania:
https://bibliotekanauki.pl/articles/2077335.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
aridisol
inceptisol
calcrete
palustrine
lacustrine
pedogenesis
pedogeneza
jeziorny
bagienny
Opis:
Study of the pedogenic features of the Upper Jurassic Morrison Formation in western Colorado, USA, shows a clear difference in the types of paleosols between the strata of the lower and upper Brushy Basin Member. Lower Brushy Basin paleosols are mostly calcareous Aridisols with Stage I through Stage III calcrete Bk horizons, abundant root traces, occasional vertic features, but only rarely with ochric epipedons. Upper Brushy Basin paleosols are mainly thicker and commonly display ochric epipedons and well-developed Bt and Bw horizons. We assign these paleosols to the order Inceptisol. Limestones occur in the Brushy Basin Member and include both uniformly micritic limestones and limestones with strongly brecciated textures. The former contain sparse body fossils and charophyte debris, while the latter are characterized by clotted-peloidal fabrics with circumgranular cracking and silica replacement. We interpret these limestones as the deposits of carbonate in small water bodies on a low-gradient flood plain, with the textures resulting from pedogenic reworking of the carbonate sediment. We find no evidence for the presence of extensive lacustrine or wetlands (Lake T’oo’dichi’) deposits in the study area. The paleoclimate suggested by all of these features is strongly seasonal, but subject to variations on orbital (precessional and higher) timescales causing intervals of semi-aridity during weaker monsoons, to alternate with sub-humid periods during stronger monsoons. The apparent long-term change in climate during Brushy Basin deposition potentially resulted from northward drift of North America.
Źródło:
Volumina Jurassica; 2014, 12, 2; 115--130
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stable isotopic and mineralogical investigations of an arid Quaternary lacustrine palaeoenvironment, Western Qaidam, China
Autorzy:
Bojar, A. V.
Rieser, A.
Neubauer, F.
Bojar, H. P.
Genser, J.
Liu, Y.
Ge, X. H.
Powiązania:
https://bibliotekanauki.pl/articles/2058952.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Qaidam
Quaternary
stable isotopes
celestine
carbonates
hypersaline lacustrine environment
Opis:
Stable isotope analyses on carbonates from lake evaporites collected from the non-marine western Qaidam basin yield a positive excursion from Pliocene to Quaternary times. At Dafeng Shan, the Quaternary sequences are composed of alternating layers of celestine/dolomite and aragonite/calcite/barite with distinct isotopic compositions. The sequence described at Dafeng Shan formed in a low energy, hypersaline lacustrine environment as indicated by the microstructures and evaporitic minerals as well as by the absence of lithoclasts. The peloids, ooids and oncoids described are related to microbialactivities in saline lake. The oxygen isotopic composition of the carbonates vary between +34.4 and +39.8‰ (SMOW), representing the heaviest values measured until now. The δ18 O and the δ34 S isotopic composition of the celestine range between 20.1 to 22.3‰ (SMOW) and +19 to +22‰ (CDT) respectively, suggesting sulfur recycling via sulfide oxidation. The carbon isotopic compositions of the carbonates show a large negative excursion of up to -30‰. The microstructures, mineralogy and isotopic compositions as well as the geological context suggest oxidation of methane from a deep source.
Źródło:
Geological Quarterly; 2005, 49, 2; 173-184
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biostratigraphy of Quaternary lacustrine deposits in Chojna (NW Poland)
Autorzy:
Czepiec, I.
Powiązania:
https://bibliotekanauki.pl/articles/83186.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
biostratigraphy
Quaternary
lacustrine deposit
mollusc
snail
bivalve
Chojna town
Polska
Źródło:
Folia Malacologica; 1999, 07, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Whitmore Point Member of the Moenave Formation: Early Jurassic Dryland Lakes on the Colorado Plateau, Southwestern USA
Autorzy:
Tanner, L.
Lucas, S.
Powiązania:
https://bibliotekanauki.pl/articles/2061348.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Utah
Arizona
Hettangian
Moenave Formation
meromictic
dryland
perennia
ephemeral
lacustrine
Opis:
The Lower Jurassic Whitmore Point Member of the Moenave Formation in Arizona-Utah, USA, comprises fish- and coprolite-bearing shales, siltstones, sandstones, and minor limestones. These facies were deposited in ephemeral and perennial lakes subject to episodic desiccation and incursions of coarse clastics during floods. Meromictic conditions developed during perennial episodes, probably due to salinity stratification, which enhanced preservation of organic matter in gray to black shales. These lakes formed on the floodout of a north-northwest oriented (relative to modern geography) system of mainly ephemeral streams on a broad and open floodplain. The Whitmore Point Member both overlies and interfingers laterally with alluvial red-bed facies of the Dinosaur Canyon Member of the Moenave Formation. The vertical transition from alluvial to lacustrine sedimentation recorded by the Dinosaur Canyon and Whitmore Point members of the Moenave Formation most probably resulted from a eustatically-controlled rise in base level during the Early Jurassic (Hettangian). The Dinosaur Canyon Member also interfingers laterally with eolian dune deposits of the Wingate Sandstone, which was deposited by winds that reworked coastal plain sediments to the north of the study area. Thus, on this part of the Colorado Plateau, fluvial, lacustrine and eolian sedimentary facies were deposited contemporaneously in laterally adjacent paleoenvironments.
Źródło:
Volumina Jurassica; 2008, 6, 1; 11-21
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrastratal flow in the Cretaceous Gyeokpori Formation (SW South Korea)
Autorzy:
Byun, Uk Hwan
Van Loon, A.J. (Tom)
Kwon, Yi Kyun
Ko, Kyoungtae
Powiązania:
https://bibliotekanauki.pl/articles/2060260.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
intrastratal flow
Gyeokpori Formation
soft-sediment deformation structures
lacustrine environment
Cretaceous
Opis:
Intrastratal flow is a process that is still poorly understood, rarely described and difficult to interpret in ancient rocks. Sediments in the Cretaceous lacustrine Gyeokpori Formation of southwestern South Korea contain some chaotically deformed sandstone layers with deformed mudstone clasts that are ascribed to this process. The interpretation is based on the fact that these layers cannot be explained as a result of subaqueous debris flows or mass transport, whereas the sedimentary context, including the presence of other soft-sediment deformation structures, indicates that intrastratal flow must have been physically possible. The sedimentary setting was a lake in which mainly siliciclastic rocks were deposited, with some interbedded volcaniclastics. The nearby volcanic activity caused seismic shocks that affected the unstable lake margins resulting in the dominance of gravity-flow deposits, but also in a high sedimentation rate that facilitated soft-sediment deformation partly caused by intrastratal flow. This must have happened fairly frequently during a probably limited time-span, as several layers showing traces of intrastratal flow are present within a succession of only <1 m thick. The combined data on the geological setting and our findings regarding the origin of the various soft-sediment deformation structures may help to recognize the traces left by intrastratal flow elsewhere in the geological record.
Źródło:
Geological Quarterly; 2020, 64, 3; 611--625
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 57

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