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Facies and statistical analyses of a crevasse-splay complex at the Tomisławice opencast lignite mine in central Poland

Dziamara Mariusz, Kaczmarek Paweł, Klęsk Jakub, Wachocki Robert, Widera Marek

Geologos

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2023

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Vol. 29, No. 3

173--181

EN

The studied crevasse-splay complex, situated within the 1st Mid-Polish lignite seam (MPLS-1), ranks amongst the best-developed and most readily accessible for direct research of all hard coal and lignite occurrences worldwide. The sandy-coaly sediments constituting it required a number of field and laboratory tests. However, the present article focuses solely on sedimentological and statistical analyses of sediments along a selected key section, the most important results of which are presented below. First of all, data obtained in previous sedimentological studies have been confirmed, in that individual segments of this complex represent both subaerial and subaqueous types of crevasse splays. On the one hand, their sediments are characterised by an extremely high content of coalified organic matter, reaching 20–40 wt.% in some samples; on the other, these crevasse splays are composed of fine sands with a median and mean grain size of 0.15 mm. In addition, the remaining statistical parameters (standard deviation, skewness and kurtosis) indicate a very good sorting of these sands, no significant so-called ‘tails’ and a better sorting close to the sediment mean grain size value, respectively.

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Osady glifu krewasowego z miocenu Polski środkowej w okolicach Konina

Widera M., Chomiak L., Gradecki D., Wachocki R.

Przegląd Geologiczny

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2017

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Vol. 65, nr 4

251--258

EN

The paper presents results of a study of crevasse splay deposits from the Miocene of central Poland near Konin. These mineral deposits occur within the 1st Middle-Polish lignite seam of Middle Miocene age, which is exploited from the Tomislawice lignite opencast mine. They consist of fine-grained sands with an admixture of plant detritus at the top and bottom layers, where the muddy-sandy clasts are present. The investigated crevasse splay deposits are predominantly massive or horizontally stratified, and they occasionally reveal small- to large-scale (planar, trough and ripple) cross-stratification. Thus, they are interpreted as representing dense gravity flows, sheet flows, and channelized flows of variable energy. The crevasse splay was formed subaerially during sudden flood conditions on the floodplain covered by a low-lying mire with predominant herbaceous vegetation. The description of the crevasse splay deposits from the Miocene of central Poland can be helpful in better understanding the sedimentation conditions of relatively thick lignite seams.

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Crevassing of an inland dune during the 1998 flood in upper Vistula river valley (South Poland

Gębica P., Stachowicz-Rybka R.

Annales Societatis Geologorum Poloniae

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2002

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Vol. 72, No 2

191-197

EN

A relatively small flood in April 1998 inundated stream valleys draining the Tarnów Plateau. The flood water of one of these streams crevassed a dune. An elongated crevasse, an irregular-shaped transport zone and a crevasse splay were formed as a result. The crevasse splay consisted of several lobes, which were separated by crevasse channels. Minor fans formed at the channel outlets. All this forms were the result of rapid processes of erosion and accumulation. The dominant lithofacies in the crevasse splay sediments were fine and medium sand with horizontal (bottomset) and low-angle (topset) stratification. Trough and planar cross-stratified medium- and coarse-grained sands appear in the middle part of the vertical sequence. Most of these sediments were laid down in a high-energy environment of a sheet flow. The phase of vanishing flow left ripple marks, encountered in the highest part of the distal splay.

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Tanatocenoza muszlowa z osadów powodziowych Białej Przemszy w Golczowicach koło Wolbromia

Alexandrowicz W.P.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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1999

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T. 25, z. 4

321-338

PL

Przedmiotem opracowania jest tanatocenoza muszlowa znaleziona w odsypie powodziowym Białej Przemszy w Golczowicach koło Wolbromia. W osadach glifu krewasowego, który powstał w rezultacie przerwania wału przykorytowego w czasie powodzi w lipcu 1997, występowały skorupki mięczaków lądowych i słodkowodnych. Przeprowadzona analiza malakologiczna pozwoliła na scharakteryzowanie tego zespołu i określenie jego zbieżności z warunkami środowiska, stopniem zalesienia i sposobem użytkowania ziemi w górnej części doliny Białej Przemszy. Skład badanej malakocenozy wskazuje na niedaleki transport materiału skorupowego. Wnioski wynikające z badań nad współcześnie tworzącymi się osadami rzecznymi mogą być bardzo użyteczne w interpretacjach zespołów faunistycznych występujących w osadach fluwialnych holocenu i plejstocenu

EN

A rich molluscan thanatocoenosis was found in the flood deposits of the Biała Przemsza river in Golczowice near Wolbrom. The mentioned sediments were accumulated during the flood in July 1997. Death assemblages of molluscs have been studied using standard methods of malacological analysis. Thanatocoenosis correspond with malacofauna living in the surrounding part of the Biała Przemsza river valley. It indicate, that during flood molluscan shells are transported over the short distance from alimentation points