Late Pleistocene and Holocene evolution of the Durne Bagno peat bog (Lublin Polesie

The Durne Bagno peat bog is the eastern, peripheral part of a large marshland complex in the Lublin Polesie. Limnic biogenic deposits occurring directly on mineral deposits are up to 8.5 m thick. They exhibit great vertical facial variability and small lateral differentiation. This indicates that the conditions of sedimentation/sedentation were similar in the whole basin in particular time intervals. The chronostratigraphically-correlated sequence of sediments allows reconstruction of the geosystem evolution in recent 13 ka BP. In its entire Late Glacial and Holocene history two basic stages may be distinguished: lacustrine (OD — middle AT) and mire (middle AT — present time

Phase constitution, magnetic ordering and microstructure of the LaFe

Microstructure and phase constitution of the LaFe11.0Co0.8Si1.2 bulk and ribbon samples in as-cast state and after annealing, were studied. For both samples in as-cast state the dominant dendritic α-Fe phase was formed. Annealing of the samples resulted in homogenization of the microstructure and change of the phase constitution. The heat treatment resulted in development of almost single-phase of the NaZn13-type structure identified as LaFe11.0Co0.8Si1.2 with minor fraction of the α-Fe. The evolution of microstructure and phase constitution was verified by EDX analysis and Mössbauer spectroscopy

Origin and Neoholocene evolution of spring-fed fens in Wardzyń, Łódź Upland, central Poland

Spring-fed fens in Wardzyń represent the rare group of alkaline mires supplied by artesian groundwater. Using multidisciplinary methods (including sedimentological, hydrometric and hydrochemical, pollen, macrofossil, malacological, geochemical, radiocarbon dating, and stable oxygen and carbon isotope analyses) we have been able to (1) reconstruct the main phases of spring-fed fen development, and to (2) determine the cause of Neoholocene groundwater ascension responsible for the mire inception. These phases are characterized by cyclic organic (peat) and carbonate (tufa) sedimentation associated with the Holocene fluctuations in humidity and temperature. The beginning of the activation of hydrological systems (involving the flow of confined groundwater of the Cretaceous aquifer) at Wardzyń occurred in the Subboreal period of the Holocene, after a long episode of decreased humidity initiated ca. 4.2 ka cal BP