Middle Miocene wetland fungi from the Adamów Lignite Mine, central Poland

2021 ◽  
pp. 1-16
Author(s):  
Grzegorz Worobiec ◽  
Elżbieta Worobiec ◽  
Marek Widera
Keyword(s):  
Middle Miocene ◽  
Central Poland ◽  
Lignite Mine

scholarly journals Crevasse splays within a lignite seam at the Tomisławice opencast mine near Konin, central Poland: architecture, sedimentology and depositional model

Geologos ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Lilianna Chomiak
Keyword(s):  
Middle Miocene ◽  
Structural Features ◽  
Fine Grained ◽  
Opencast Mine ◽  
Main River ◽  
Main River Channel ◽  
Lignite Mine ◽  
Flooding Event ◽  
Crevasse Splay ◽  
Sandy Sediments

AbstractThe present article focuses predominantly on sandy deposits that occur within the Middle Miocene lignite seam at the Tomisławice opencast mine, owned by the Konin Lignite Mine. As a result of mining activity, these siliciclastics were available for direct observation in 2015–2016. They are situated between two lignite benches over a distance of ~500 m in the lower part and ~200 m in the higher part of the exploitation levels. The maximum thickness of these sandy sediments, of a lenticular structure in a S–N cross section, is up to 1.8 m. With the exception of a thin lignite intercalation, these siliciclastics comprise mainly by fine-grained and well-sorted sands, and only their basal and top layers are enriched with silt particles and organic matter. Based on a detailed analysis of the sediments studied (i.e., their architecture and textural-structural features), I present a discussion of their genesis and then propose a model of their formation. These siliciclastics most likely formed during at least two flood events in the overbank area of a Middle Miocene meandering or anastomosing river. Following breaching of the natural river levee, the sandy particles (derived mainly from the main river channel and levees) were deposited on the mire (backswamp) surface in the form of crevasse splays. After each flooding event, vegetation developed on the top of these siliciclastics; hence, two crevasse-splay bodies (here referred to as the older and younger) came into existence. As a result, the first Mid-Polish lignite seam at the Tomisławice opencast mine is currently divided in two by relatively thick siliciclastics, which prevents a significant portion of this seam from being used for industrial purposes.

scholarly journals Small mammals from the opencast lignite mine Gračanica (Bugojno, middle Miocene), Bosnia and Herzegovina

2019 ◽  
Vol 100 (2) ◽  
pp. 295-300 ◽  
Author(s):  
Wilma Wessels ◽  
Hans de Bruijn ◽  
Zoran Marković ◽  
Miloš Milivojević
Keyword(s):  
Bosnia And Herzegovina ◽  
Small Mammals ◽  
Middle Miocene ◽  
Lignite Mine

The beaver Anchitheriomys from the Miocene of central Europe

2008 ◽  
Vol 82 (5) ◽  
pp. 1009-1020 ◽  
Author(s):  
Clara Stefen ◽  
Thomas Mörs
Keyword(s):  
Central Europe ◽  
Middle Miocene ◽  
Ontogenetic Changes ◽  
Central European ◽  
Northwest Germany ◽  
Lignite Mine ◽  
Metric Variation

New finds of teeth and mandibles of Anchitheriomys from the Hambach opencast lignite mine in Northwest Germany and the first detailed descriptions of other mandibles from South Germany and Switzerland allow a review of the Central European specimens of this rare beaver genus. The metric variation of cheek teeth and especially the great differences in dimensions of incisors can be much better assessed. The observed range in size can be attributed to ontogenetic changes, and all material is assigned to Anchitheriomys suevicus. Stratigraphically, this species is restricted to the early middle Miocene, European Mammalian Neogene biozones MN 5–6.

scholarly journals Variation of lignite ash in vertical and horizontal sections of mining wallsin the Konin Lignite Mine, central Poland

2020 ◽  
Vol 46 (1) ◽  
pp. 17
Author(s):  
Lilianna Chomiak
Keyword(s):  
Calorific Value ◽  
Chemical Precipitation ◽  
Ash Content ◽  
Statistical Parameters ◽  
Central Poland ◽  
Lignite Mine ◽  
Standard Procedures ◽  
Field Samples ◽  
Variable Distribution ◽  
Opencast Mines

This paper focuses on the variations of lignite ash along selected sections and mining walls from three lignite opencast mines in central Poland. They are owned by the Konin Lignite Mine, where the first Mid-Polish lignite seam is being mined to produce electricity. Ash content in lignite is important because ash lowers the calorific value of the lignite. The results obtained are based on 266 samples of lignite collected from the Drzewce, Tomisławice, and Jóźwin IIB opencasts. All samples were tested according to ISO 1171 standard procedures, that is, they were first burned at a temperature of 850°C, then the ash content was determined on a dry basis (Ad), be-fore the basic statistical parameters were calculated. The studied lignite seam is characterised by a variable distribution pattern of ash both along selected vertical sections and lignite walls, as well as between the three open-casts. The ash content of individual samples ranged from 6.5 to 69.8 wt%, while the average content in opencast mines varied from 9.7 to 17.6 wt%. The coefficient of variation is large (80.23–96.33%) in the case of the Drzewce and Tomisławice, and low to average (14.53–37.75%) in the case of Jóźwin IIB. Significant ash enrichment of some beds is interpreted in this article as a consequence of floods occurring in a Mid-Miocene mire (backswamp), but also of chemical precipitation. When lignite is burned to generate electricity, a relatively large amount of ash is produced. Therefore, recognition of ash content in lignite, in addition to the chemical composition and phase of ash, is recommended to better protect the environment. At the first stage of protection, it can be best achieved by analysing field samples for ash content.

scholarly journals Seismically induced soft-sediment deformation in crevasse-splay microdelta deposits (Middle Miocene, central Poland) – reply

2019 ◽  
Vol 63 (2) ◽  
Author(s):  
Lilianna CHOMIAK ◽  
Piotr MACIASZEK ◽  
Robert WACHOCKI ◽  
Marek WIDERA ◽  
Tomasz ZIELIŃSKI
Keyword(s):  
Middle Miocene ◽  
Soft Sediment ◽  
Central Poland ◽  
Sediment Deformation ◽  
Soft Sediment Deformation ◽  
Crevasse Splay

scholarly journals Neogene wetland vegetation based on a leaf assemblage from the Bełchatów Lignite Mine (Central Poland)

2016 ◽  
Vol 56 (2) ◽  
pp. 441-497 ◽  
Author(s):  
Grzegorz Worobiec ◽  
Adam Szynkiewicz
Keyword(s):  
Forest Type ◽  
Sedimentary Environment ◽  
Floristic Composition ◽  
Temperate Climate ◽  
Mean Annual Temperature ◽  
Fossil Assemblage ◽  
Central Poland ◽  
Lignite Mine ◽  
Approach Method ◽  
Warm Temperate

Abstract Well-preserved leaf macroremains collected in the Bełchatów Lignite Mine (Central Poland) were investigated. Fossil leaves of Acer, Dicotylophyllum, Fagus, Eucommia, Laria, Laurophyllum, Liquidambar, Pinus, Populus, Pterocarya, Quercus, Salix, Salvinia, Taxodium, Ulmus, Vitis, and Zelkova, and fossil fruit of Eucommia were found in fossil assemblage KRAM-P 218 formed in a fluvial sedimentary environment. The fossil assemblage is dominated by plant remains of riparian vegetation of bottomland hardwood forest type. Some taxa point to the presence of mesophytic upland communities. The floristic composition points to warm temperate climate with mild winters, comparable to Cfa type (warm temperate, fully humid with hot summer) in the Köppen-Geiger climate classification. Mean annual temperature of 13.5-16.5°C was reconstructed by the coexistence approach method. Middle to late Miocene age (late Sarmatian to early Pannonian) is suggested for the plant-bearing deposits.

scholarly journals What are cleats? Preliminary studies from the Konin lignite mine, Miocene of central Poland

Geologos ◽  
2014 ◽  
Vol 20 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Marek Widera
Keyword(s):  
Water Permeability ◽  
Mining Activity ◽  
Hard Coal ◽  
Mineral Matter ◽  
Present Contribution ◽  
Opencast Mine ◽  
Central Poland ◽  
Lignite Mine ◽  
The Face ◽  
The Mean

Abstract Cleats (fractures, joints) are discontinuities in coals, including lignites. They are important in mining activity because of their gas and water permeability in hard coal, and mainly because of their water permeability in lignites. As opposed to hard-coal cleats, lignite cleats have not been studied in detail before. The present contribution does so, using as an example the 1st Middle-Polish Lignite Seam (MPLS-1) in the Jóźwin IIB opencast mine in central Poland. It should be mentioned here that any remarks in the present contribution concerning MPLS-1 refer exclusively to this lignite seam in the Jóźwin IIB opencast mine. The investigated discontinuities consist of two sets, i.e. the face and butt cleats, which are roughly oriented NW-SE and NE-SW, respectively. The mean spacing of the face cleats is ~12.4 cm, while the mean spacing of the butt cleats is ~12.8 cm. The maximum average aperture is ~4.9 mm for the face cleats and ~4.1 mm for the butt cleats. The cleat spacing and aperture do not depend on the lignite thickness, but the cleat spacing increases with increasing mineral-matter and xylite content, whereas the aperture increases when the contents decrease. The regional folding and local salt diapirism tentatively explain the formation of the orthogonal system of the lignite cleats, partly because of the parallelism of the face cleats and the major tectonic directions in central Poland.

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