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    Wyświetlanie 1-12 z 12
    Tytuł:
    Macroscopic lithotype characterisation of the 1st Middle-Polish (1st Lusatian) Lignite Seam in the Miocene of central Poland
    Autorzy:
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/94313.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    lignite lithotypes
    sedimentology
    First Middle-Polish Lignite Seam
    Miocene
    central Poland
    litotypy węgla brunatnego
    sedymentologia
    pierwszy środkowopolski pokład węgla brunatnego
    miocen
    Polska Centralna
    Opis:
    The 1st Middle-Polish (1st Lusatian) Lignite Seam is exploited in open-cast mines in central Poland. A large number of lignite lithotypes, grouped in four lithotype associations, are distinguished: xylitic, detritic, xylo-detritic and detro-xylitic lithotype associations, which show various structures. Each lithotype association was produced under specific peat-forming environmental conditions. In the case of the lignite seams under study they represent all the main environments that are known from Neogene mires, i.e.: fen or open water, bush moor, wet forest swamp and dry forest swamp. For a simple and practical description in the field of both the lignite sections and borehole cores, a new codification for lignite lithotypes is proposed. It is based on the codification of clastic deposits (lithofacies). The practical value of the new lignite lithotype codification is examined in three vertical sections of the 1st Middle-Polish Lignite Seam.
    Źródło:
    Geologos; 2012, 18, 1; 1-11
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Paleogene-Neogene tectonic evolution of the lignite-rich Szamotuły Graben
    Autorzy:
    Widera, Marek
    Stawikowski, Wojciech
    Uścinowicz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/138663.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Palaeozoic Platform
    Polish Basin
    salt diapirism
    synsedimentary tectonics
    lignite compaction
    platforma paleozoiczna
    basen polski
    diapiryzm solny
    wysad solny
    tektonika synsedymentacyjna
    zagęszczanie węgla brunatnego
    Opis:
    The Szamotuły Graben covers the southernmost part of the Permo-Mesozoic Poznań–Szamotuły Fault Zone. Along this regional discontinuity there are several salt structures, including the Szamotuły diapir, over which an extensional graben formed in the Paleogene and Neogene. The graben is located north of Poznań in central-western Poland, and is NW–SE-trending, ~20 km long, 3–5.5 km wide, and up to 160 m deep. It is filled with Lower Oligocene and Neogene sediments, including relatively thick lignite seams. Data from boreholes allow the assignment of the graben-fill sediments to appropriate lithostratigraphic units. Furthermore, analysis of changes in the thickness of these units provides evidence for periods of accelerated graben subsidence or uplift relative to its flanks. As a result, two distinct stages of tectonic subsidence and one inversion in the Paleogene–Neogene evolution of the Szamotuły Graben have been distinguished. Thus, relatively significant subsidence occurred in the Early Oligocene and the middle Early–earliest Mid-Miocene, while slight inversion took place in the middle part of the Mid-Miocene.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 3; 387-401
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismically induced soft-sediment deformation in crevasse-splay microdelta deposits (Middle Miocene, central Poland) – reply
    Autorzy:
    Chomiak, Lilianna
    Maciaszek, Piotr
    Wachocki, Robert
    Widera, Marek
    Zieliński, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2058658.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tectonic graben
    lignite seam
    SSDS
    domino structures
    tectonics
    seismics
    Opis:
    We expected that our paper on the crevasse-splay microdelta (Chomiak et al., 2019) would arouse the interest of other researchers for at least two reasons. First, this is the first such palaeoform discovered and described within the Mid-Miocene lignite seam in Poland. Second, the microdelta siliciclastic deposits are strongly deformed both ductile and brittle. Therefore, we would like to thank Tom van Loon for his effort to comment on our article, including his words of appreciation, and above all, for pointing out some of the terminological and interpretative shortcomings. Our reply will be in line with the issues discussed in his comment.
    Źródło:
    Geological Quarterly; 2019, 63, 2; 429--433
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    What can be learned about the deposition and compaction of peat from the Miocene lignite seam exposed in the Chłapowo Cliff on the Polish coast of the Baltic Sea?
    Autorzy:
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/184511.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Baltic Sea coast
    lignite
    peat
    deposition
    compaction ratio
    Opis:
    This study focuses on discussing the relationship between the accumulation of peat and its compaction in the overbank zone of the Miocene river system. The examined 2nd Lusatian lignite seam is characteristically interbedded with sandy deposits and these are less compressible than peat. Therefore, in favourable conditions such as those found at Chłapowo Cliff (on the Baltic Sea coast in northern Poland), it is possible to identify the effects of an even or uneven lowering of the mire surface, resulting from diversified compaction of the underlying phytogenic beds. The research problem was applied to two examples located close to each other within the lignite seam. The first case shows the accumulation of fresh peat layers of almost equal thickness, while the second one presents a reduction in the thickness of fresh peat beds over the fossilised channel-fill sandy body. Only the latter example allows us to calculate the peat-to-lignite compaction ratio. The results of the compaction ratio obtained, Cr ≈ 7.37, mean that the youngest, fresh peat layers were compacted at least 7 times, transforming them into lignite beds. However, such a high compaction value, estimated for the top layers of the Miocene mire, cannot be directly taken into account when reconstructing the total thickness of the peat seam prior to covering it with mineral overburden. The published peat-to-lignite compaction ratios, determined using other research methods, for the 2nd Lusatian lignite seam or its stratigraphic equivalents range from 1.7 to 6.0 in most cases, with averages of 2.2 to 4.0. The differences between the data in the literature and the results given in this paper are due to the fact that the process of peat/lignite compaction is ongoing and cumulative.
    Źródło:
    Geology, Geophysics and Environment; 2019, 45, 2; 111-119
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Architektura i geneza iłów w górnym poziomie węgli brunatnych formacji poznańskiej (środkowy miocen) : Odkrywka Tomisławice k. Konina w środkowej Polsce
    Architecture and origin of clays within the upper part of lignites of the Poznań Formation (Middle Miocene) : The Tomisławice lignite open-cast mine near Konin, central Poland
    Autorzy:
    Chomiak, Lilianna
    Urbański, Paweł
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2076113.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    osady klastyczne
    palaeolake
    śródpolski podkład węgla
    pokład węgla brunatnego
    zawartość popiołu
    miocen polski
    clastic sediments
    first mid-Polish lignite seam
    ash content
    Miocene of Poland
    Opis:
    In the Tomisławice opencast mine, owned by the Konin Lignite Mine, a relatively widespread (>1.5 km2) and thick (up to 80 cm) layer of clay occurs within the first mid-Polish lignite seam. These fine-grained sediments are interpreted as deposited in a long-lasting lake that existed in the mid-Miocene backswamp area. Due to the exploitation of this seam forelectricity production, interbeddings of clastic sediments significantly reduce the quality of lignite. Currently, lignite is mined together with the clays in the Tomisławice opencast mine. Such procedure in extreme cases, where the maximum. thickness of the clay layer is up to 80cm, increases/may increase the ash content of the entire lignite seam almost twice. Therefore, selective lignite mining would be recommended, i.e. without clays, which unfortunately is not practiced due to technological and financial reasons.
    Źródło:
    Przegląd Geologiczny; 2020, 68, 6; 526--534
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is the Złoczew lignite deposit geologically suitable for the first underground gasification installation in Poland?
    Autorzy:
    Urbański, Paweł
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/94451.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    tectonic graben
    lignite seams
    UCG criteria
    clean energy
    Miocene
    central Poland
    rów tektoniczny
    pokłady węgla brunatnego
    UCG
    czysta energia
    Miocen
    środkowa Polska
    Opis:
    The present study focuses on alternative methods of exploiting lignite in comparison to conventional opencast mining and combustion in power plants for the generation of electricity. In Poland, opencast lignite pits cover large areas, creating social and environmental conflicts. In order to stabilise the production level of electricity and reduce the negative effects of opencast mining, alternative ways of exploiting lignite are suggested, one of these being underground gasification in situ. The Złoczew lignite deposit, which will most likely be exploited in the near future, provides an opportunity to discuss the unconventional method of underground coal gasification (UCG). On the basis of technological and geological criteria that have been established to determine the suitability of Polish lignite for underground gasification, resources to be used this way have been estimated. Through gasification, over 15 million tonnes of lignite can be utilised, which is about 2.5 per cent of resources of the Złoczew deposit intended for opencast mining. With this in mind, we suggest to take action by starting a pilot installation, to be followed by a commercial one for underground gasification after completion of superficial mining. Naturally, any future application of this method will be preceded by assessment of geological conditions at the Złoczew opencast pit.
    Źródło:
    Geologos; 2020, 26, 2; 113-125
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slump folds within mid-Miocene crevasse-splay deposits : a unique example from the Tomisławice lignite opencast mine in central Poland
    Autorzy:
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2060269.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    crevasse-splay facies
    lignite lithotypes
    slump folds
    soft-sediment deformation
    Konin Basin
    Neogene
    Opis:
    Non-tectonic, soft-sediment deformation structures occur in mid-Miocene crevasse-splay deposits exposed in the Tomisławice lignite opencast mine in central Poland. The crevasse-splay cross-stratified siliciclastic deposits are underlain by continuously folded and relatively thick lignite beds, and overlain by a thin undisturbed layer of lignite. Only the middle part of the crevasse-splay succession is deformed plastically in the form of folds, while the lower and uppermost beds are undeformed. Most of the intraformational deformation structures are recumbent folds, while only a few can be classified as upright folds in the initial stage of their evolution. The origin of these folds is associated here with a penecontemporaneous slumping process caused by liquefaction of sandy-muddy sediments. The slumping was triggered by an increase in the inclination of heterolithic layers caused by the compactional subsidence of an organic-rich substrate - peat. This type of subsidence occurred following a sudden siliciclastic load on top of the underlying and poorly-compacted peat/lignite seam. The initiation and development of the slump folds can be explained by differentiated loading, compaction and liquefaction processes, and the introduction of a tectonic agent is unnecessary.
    Źródło:
    Geological Quarterly; 2020, 64, 3; 711--722
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tectonic-climatic interactions during changes of depositional environments in the Carpathian foreland: An example from the Neogene of central Poland
    Autorzy:
    Widera, Marek
    Zieliński, Tomasz
    Chomiak, Lilianna
    Maciaszek, Piotr
    Wachocki, Robert
    Bechtel, Achim
    Słodkowska, Barbara
    Worobiec, Elżbieta
    Worobiec, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2024070.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    river type
    lignite seam
    sedimentology
    tectonics
    climate
    miocene
    pokłady węgla brunatnego
    sedymentologia
    tektonika
    klimat
    miocen
    Opis:
    Many geological problems have not been convincingly explained so far and are debatable, for instance the origin and changes of the Neogene depositional environments in central Poland. Therefore, these changes have been reconstructed in terms of global to local tectonic and climatic fluctuations. The examined Neogene deposits are divided into a sub-lignite unit (Koźmin Formation), a lignite-bearing unit (Grey Clays Member), and a supra-lignite unit (Wielkopolska Member). The two lithostratigraphic members constitute the Poznań Formation. The results of facies analysis show that the Koźmin Formation was deposited by relatively high-gradient and well-drained braided rivers. Most likely, they encompassed widespread alluvial plains. In the case of the Grey Clays Member, the type of river in close proximity to which the mid-Miocene low-lying mires existed and then were transformed into the first Mid-Miocene Lignite Seam (MPLS-1), has not been resolved. The obtained results confirm the formation of the Wielkopolska Member by low-gradient, but mostly well-drained anastomosing or anastomosing-to-meandering rivers. The depositional evolution of the examined successions depended on tectonic and climatic changes that may be closely related to the mid-Miocene great tectonic remodelling of the Alpine-Carpathian orogen. This resulted in palaeogeographic changes in its foreland in the form of limiting the flow of wet air and water masses from the south and vertical tectonic movements.
    Źródło:
    Acta Geologica Polonica; 2021, 71, 4; 519--542
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vegetation response to environmental changes based on palynological research on the Middle Miocene lignite at the Jóźwin IIB open-cast mine (Konin region, central Poland)
    Autorzy:
    Słodkowska, Barbara
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1835984.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    palynology
    lignite seam
    palaeofloristic reconstruction
    climatic changes
    Neogene of Poland
    Opis:
    Palynological research was performed on the first Mid-Polish lignite seam (MPLS-1) at the Jóźwin IIB open-cast mine. The extremely rich pollen assemblages allowed investigation of the development of phytogenic sedimentation and the succession of plant communities. The vegetation cover, representing peat accumulation and adjacent areas, was reconstructed in the homogeneous lignite seam. Despite the lack of clear macroscopic differences in the lignite lithology and a similar floristic composition, a similar succession of plant communities was observed in three repetitions in the profile. The plant communities described were grouped into five cycles. Changes in the succession resulted mainly from oscillations of the groundwater level. On the basis of the vegetation composition, the climatic conditions predominant during the peat-forming sedimentation were reconstructed. Climate changes are most precisely recorded in the mixed mesophilous forest community. Its floristic composition shows that the climate was warm-temperate and humid at that time. The lower part of the profile contains more taxa with high thermal requirements: Araliaceae, Mastixiaceae, Anacardiaceae, Hammamelidaceae, Cornaceae, Symplocaceae, Ilex, Itea, Engelhardia, etc. It is related to the Middle Miocene Climatic Optimum (MMCO). In the upper part of the profile, the vegetation composition reflects the beginning of a cooling trend. This is indicated by the reduced number of highly thermophilous taxa and the decreased taxonomic diversity of forest communities. The changing climatic and environmental conditions interrupted peat-bog sedimentation and caused termination of the development of thicker lignite seams.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2021, 91, 2; 149-166
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Palaeoenvironment of the middle Miocene wetlands at Drzewce, Konin region, central Poland
    Autorzy:
    Worobiec, Elżbieta
    Widera, Marek
    Worobiec, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2134834.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    lignite
    palynology
    non-pollen palynomorphs
    palaeovegetation
    palaeoclimate
    fossil fungi
    Neogene
    Opis:
    Palynological analysis of the 1st mid-Polish lignite seam (MPLS-1) of the Drzewce deposit (Konin region, central Poland) was used as the data source for palaeoenvironmental and palaeoclimatic interpretations. Lignites of the 1st group developed in the middle Miocene, during and shortly after the last peak of the Mid-Miocene Climatic Optimum, over a large area of Poland, and they are the youngest of the main Neogene lignite seams in Poland. In the Konin region, these lignites have a relatively significant thickness (up to 20 m) and therefore they are (or were in the past) exploited in several open-pit mines. A total of 36 palynological samples from the 6.3-m-thick seam of the Drzewce opencast mine was studied in detail. Palynological analysis of the lignite seam indicates that the area was overgrown by palustrine wetland communities, similar in composition to modern pocosins. The most characteristic elements of them were shrubs in the Ericaceae family. The climate at that time was warm temperate and humid. The estimated mean annual temperature (MAT) for the lignite seam at Drzewce is 15.7–17.8 °C. Comparison with other palynofloras from the MPLS-1 shows that the climate during the formation of the group of seams was more or less homogenous across the entire Polish Lowlands. Sedimentological data and results of palynological studies (including NPPs) at Drzewce indicate that the palaeomires were relatively distant from the channels of the river system in the Konin Basin. The fossil fungal assemblage indicates dense vegetation on damp, swampy soils and the presence of small, shallow-water bodies, with a variable water level or even periodic reservoirs, existing only during the wet season or after floods. In small, flooded depressions, such as the pools in bogs, filamentous green algae occurred. The presence of zygospores of the desmids Desmidiaceaesporites cosmarioformis most probably indicates relatively nutrient-poor (ombrotrophic) conditions. Fluctuations in the frequency of individual plant taxa (including Sequoia and Sciadopitys) are likely to reflect changes in water level and trophic conditions.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2022, 92, 2; 201--218
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    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:
    Wpływ przerostów piaszczystych w węglu brunatnym na działalność górniczą : przykład ze złoża „Pątnów IV” (okolice Konina) w środkowej Polsce
    The impact of sandy interbeddings in lignite on mining activities : an example from the “Pątnów IV” deposit (Konin vicinity) in central Poland
    Autorzy:
    Dziamara, Mariusz
    Glacová, Veronika
    Klęsk, Jakub
    Marschalko, Marian
    Wachocki, Robert
    Widera, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2087056.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    krzemoklastyki
    stożek krewasowy
    pierwszy środkowopolski pokład węgla brunatnego
    górnictwo odkrywkowe
    środkowy miocen
    siliciclastics
    crevasse splays
    first Mid-Polish lignite seam
    opencast mining
    Middle Miocene
    Opis:
    Lignite from the “‘Pątnów IV” deposit is mined in the Jóźwin IIB opencast by the Konin Lignite Mine. Within the exploited 1st Mid-Polish lignite seam, there are layers of sand with a thickness of over 5 m. Based on field observations and geological mapping, these sandy interbeddings are interpreted as deposits of two or three crevasse splays of different ages. Due to such a large thickness of sands, only the upper bench of the lignite seam is currently mined in the Jóźwin IIB opencast. On the other hand, the exploitation of the lower and middle lignite benches of this seam is unprofitable at present.
    Źródło:
    Przegląd Geologiczny; 2022, 70, 5; 376--383
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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