Browsing by Subject "palaeoenvironment"

Now showing 1 - 4 of 4

Access status: Open Access ,
Analysis of the trace fossils from Paleogene formations of the Central Western Carpathian (Orava region)
(Wydawnictwa AGH, 2016) Šimo, Vladimir; Starek, Dušan
Up to now only little attention was dedicated to the study of the trace fossils in the development of the Central Carpathian Paleogene Basin in the Orava region.
Access status: Open Access ,
Geochemical characteristics of Neogene methane-bearing lignite of the Bełchatów region
(2017) Maruta, Michał; Zakrzewski, Adam
Coal beds could contain various amount of methane. This attribute might be dangerous in shafts or quarrying. Among other things, the works in the coal beds, including drilling, potentially there is a risk of exceeding the methane lower explosive limit. But on the other hand it is a source of unconventional hydrocarbon accumulations. In this paper geochemical characteristic of organic matter of tertiary brown coal from central part of Poland were performed. Geochemical surveys helps to know about genesis of methane from study area. The analysed samples contain various quantity of organic carbon, from 20,74 to 71.93 wt. %. Lignite from examine samples have weak hydrocarbon potential. In tertiary sediments prevails III type of kerogen with admixture of II type of kerogen. The thermal maturity of the tertiary organic matter changes within the interval from 354 to 419 in Tmax scale. Organic matter is immature. The composition of bitumens is different in various part of study area. Elemental analysis confirm that brown coal was comprised mostly by humic-group macerals. Coal samples contain methane with mixed genesis.
Access status: Open Access ,
Palaeogeografia Arktyki w jurze
(Wydawnictwa AGH, 2009) Golonka, Jan
Four maps illustrate geodynamic evolution and development palaeoenvironment and palaeolithofacies of the circum-Arctic region during Jurassic times. Plate tectonic process involved break-up of the supercontinent Pangea, rifting and spreading, closure on Mongol-Okhock and Anui oceans, collision of terranes with North America. Clastic sedimentation prevailed during Jurassic in the region. Important source rocks were deposited during Late Jurassic-Early Cretaceous times.
Access status: Open Access ,
Paleogene microfossils from the submarine debris flows in the Skole basin (Polish and Ukraine Outer Carpathians)
(Wydawnictwa AGH, 2014) Szydło, Andrzej; Garecka, Małgorzata; Jankowski, Leszek; Malata, Tomasz
Biostratigraphic analysis of fossils material has allowed the documentation of sediment gravity flows in the Skole basin during the Paleocene and Eocene times, and also in the Eocene-Oligocene transition. This most external basin of the NE Outer Carpathians was a marginal sea especially sensitive to geotectonic instability and relative sea-level change, favoring the development of down slope movements at these times. The dominance of calcareous forms in foraminifera, and a large share of redeposited species among the nanno- and microfossils indicate a close relationship of sediments containing them with the shelf environment and documents not too long transport. Additionally the recycled forms are often well preserved, indicating that the rock contained in flows were only plasticized and hydrated while the material itself was not a subject of significant mechanical processing in contrast to that one, which directly documented down slope moving. The latter forms are bad preserved and their fossil remains are usually corroded, partially dissolved and broken during this process. In addition, the planktonic forms including foraminifera, calcareous dinocysts and nannoplankton allow documenting the time of the final deposition of the sediment transported on slope.