Charakterystyka dolnomioceńskiej IV dąbrowskiej grupy pokładów węgla brunatnego w Polsce
Abstract
CHARACTERISTICS OF THE IV DĄBROWA LIGNITE SEAMS GROUP IN THE LOWER MIOCENE IN POLAND
Summary
The IV Dąbrowa Lignite Seams Group was originated in lowermost Miocene. It corresponds to the Bitterfeld Seam and IV Lusatian Lignite Seam in Germany. In the SW part of Polish Lowlands these lignites extent mainly on Lower Silesia territory at the area of about 7.000 sq. km (Fig. 1). Their average total thickness is 6.4 m (max. 30 m). Total geological resources of the IV Lignite Seams are estimated in Poland for about 50.8x109 tons including Perspective (Recconaissance) Resource of about 17.3x109 tons (tab. 8).The IV Lignite Seams are connected with lignite-bearing Rawicz fm. which is developed as light grey and grey sands and silts. Rawicz fm. overlies the Leszno fm. and underlies the Ścinawa fm. (Fig. 2, tab. 1). They show a good correlation with German lithostratigraphic units of Tertiary (tab. 1). Lignites of the IV Seams Group are good energetic coals (beat value av. 9.2 MJ/kg; ash cont.av.18.63 %) but with high sulphur content (av. 3,50%). They have an economic importance at the multiseam deposits, especially in the western part of the IV Lignite Seams extension, near Gubin and Mosty (Figs 1, 2).
Summary
The IV Dąbrowa Lignite Seams Group was originated in lowermost Miocene. It corresponds to the Bitterfeld Seam and IV Lusatian Lignite Seam in Germany. In the SW part of Polish Lowlands these lignites extent mainly on Lower Silesia territory at the area of about 7.000 sq. km (Fig. 1). Their average total thickness is 6.4 m (max. 30 m). Total geological resources of the IV Lignite Seams are estimated in Poland for about 50.8x109 tons including Perspective (Recconaissance) Resource of about 17.3x109 tons (tab. 8).The IV Lignite Seams are connected with lignite-bearing Rawicz fm. which is developed as light grey and grey sands and silts. Rawicz fm. overlies the Leszno fm. and underlies the Ścinawa fm. (Fig. 2, tab. 1). They show a good correlation with German lithostratigraphic units of Tertiary (tab. 1). Lignites of the IV Seams Group are good energetic coals (beat value av. 9.2 MJ/kg; ash cont.av.18.63 %) but with high sulphur content (av. 3,50%). They have an economic importance at the multiseam deposits, especially in the western part of the IV Lignite Seams extension, near Gubin and Mosty (Figs 1, 2).