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    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:
    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:
    Compaction of lignite: a review of methods and results
    Autorzy:
    Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/139143.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    peat
    lignite
    coal
    compaction process
    compaction ratio
    peat:lignite compaction ratio
    torf
    węgiel brunatny
    węgiel
    proces zagęszczania
    wskaźnik zagęszczenia
    Opis:
    The published peat:coal compaction ratios range from 1.1:1 to 60:1 and from 1.1:1 to 11:1 for lignites. These probably represent realistic end-member values for the degree of compaction during the transformation of peat into lignite and then to coal. Hence, in many cases, the obtained values of the compaction ratio are under- or overestimated with reference to the entire coal seam. This study focuses on the changes of thickness between a peat bed and the resulting lignite seam. The fundamental question is how many times the thickness of the peat bed, prior to covering the mire by the overburden, was greater than the present-day thickness of the lignite seam. The majority of methods reported in this paper cannot be used directly to quantify the amount of compaction of the lignite seam. In this context, the only category of methods which allow a direct estimation of the peat:lignite compaction ratio are the so-called stratigraphic methods. Therefore, based on comparison of the initial peat bed thickness with lignite seam thickness, the most accurate peat:lignite compaction ratio ranges from 2:1 to 4:1.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 3; 367-378
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Uwagi o wyznaczaniu współczynnika kompakcji ksylitów dla pierwszego środkowopolskiego pokładu węgla brunatnego w centralnej Polsce
    Remarks on determining the compaction coefficient of xylites for the first Middle-Polish lignite seam in central
    Autorzy:
    Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075065.pdf
    Data publikacji:
    2013
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle-Polish lignite seam
    xylite compaction
    lignite compaction
    Middle Miocene
    Central Poland
    środkowopolski pokład węgla brunatnego
    kompakcja ksylitu
    kompakcja węgla brunatnego
    środkowy miocen
    Polska centralna
    Opis:
    The First Middle-Polish lignite seam of Middle Miocene age is exploited in all opencast mines in the Konin-Turek area, central Poland. This lignite seam contains a large number of xylites, for which the compaction coefficient was calculated as equal to 1.2. On the other hand, it is known that the compaction coefficient for the whole 1st Middle-Polish lignite seam is approximately 2.0. It follows that the compaction coefficient of xylites is 60% of the compaction coefficient for the whole lignite seam. Therefore, the compaction coefficient for the 1st Middle-Polish lignite seam can be easily determined on the basis of the compaction coefficient of xylites. In contrast to other methods, compaction studies of xylites are characterised by easy measurements and simple calculations, and allow neglecting, e.g., post-sedimentary deformation of the lignite seam.
    Źródło:
    Przegląd Geologiczny; 2013, 61, 5; 304--310
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Postsedymentacyjne ruchy wznoszące w rowie Lubstowa (Środkowa Polska)
    Postsedimentary tectonic uplift in the Lubstów Graben (Central Poland)
    Autorzy:
    Widera, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074833.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    pokład węgla brunatnego
    kompacja węgla brunatnego
    subsydencja
    ruchy wznoszące
    rów Lubstowa
    2nd Lusatian lignite seam
    lignite compaction
    subsidence
    tectonic uplift
    Lubstów Graben
    Opis:
    The Lubstów Graben is an exception in the Konin-Turek territory, where the 2ndnd
    Źródło:
    Przegląd Geologiczny; 2011, 59, 10; 681-687
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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