Flechtingen-Roßlauer Scholle
The Flechtingen-Roßlauer Scholle , also known as Flechtingen-Roßlau-Scholle or Flechtinger Scholle for short , is a Hercynian clod of the earth's crust that extends from the Drömling valley in the north-west to the south-east to Roßlau to the south-east and the northern and north-eastern boundary represents the subhercyneal valley . It forms a regional unit of the Central German large block and is one of the northernmost deposits of hard rock in northern Germany, which is otherwise almost completely covered by Quaternary loose rock. Their solid rocks are on the surface in the area of the Flechtinger mountain range and the cathedral rock in Magdeburg.
geology
The consolidated earth crust in central Germany was created during the Variscan mountain formation . In the Mesozoic it broke into individual Hercynian clods, including those that are now the Thuringian Forest , Harz and Flechtingen-Roßlauer clods that were lifted up. After another uplift in the Cenozoic era , the Flechtingen-Roßlauer Scholle is now only covered with the most recent sediments , and in some places its rocks are on the surface.
The predominant rocks are sediments and volcanic rocks of the Carboniferous and Lower Permian (basement and transition layers). They were deposited under the sea in the Rhine Ocean and folded as part of the Variscan plate collision. After the folding, the mountains became truncated and soon covered again by the sea. Granitoid rocks have been found in plutons .
Over the next millions of years until the Cretaceous period , the region was covered by sediments, initially those of the Zechstein Sea . In the Triassic , Jura and Cretaceous periods, times of flooding alternated with times of dryness. As the sediments became increasingly thick, the Zechstein salt below began to flow plastically and formed salt structures such as those of the Allertal , the Oschersleben-Staßfurt saddle or the Hakel structure. In the Tertiary , the original North Sea pushed into the area and deposited marine sediments. During this time, brown coal deposits emerged . However, Upper Eocene marine deposits are missing on the entire wide Kulmaus stroke of the Flechtingen-Roßlauer Scholle, which thus formed a continental threshold during this time.
Rock deposits
Flechtinger mountain range
In the Flechtinger mountain range , volcanic rocks and sedimentary rocks from the Carboniferous and Permian are on the surface and are extracted in quarries.
Magdeburg cathedral rock
As Domfelsen are in the city of Magdeburg sandstone and siltstone in.
Quartzite quarries Gommern
The quartzite deposit near Gommern, which was mined for a long time, consists of a more than 430 m thick alternating layer of quartzite banks and mudstone layers in a ratio of 5: 2, originally a sand - clay alternation with typical sediment marks and structures of turbidites . It is classified as a flysch from the Lower Carboniferous and is tectonically folded ( anticlines and synclines ) and intensely fissured .
Individual evidence
- ↑ B.-C. Ehling: Flechtingen-Roßlau-Scholle . In: Geology of Saxony-Anhalt 2008.
- ↑ a b c Geopark Harz - Braunschweiger Land - Ostfalen. Landmark 27. Ummendorf Castle . Geopark office in Königslutter, 2014 (accessed on February 26, 2016).
- ↑ Friedrich Schust, Jürgen Wasternack: Granitoid types in post-kinematic granitoid plutons: Images of autonomous intrusion thrusts - examples from the northern edge of the Bohemian massif (Erzgebirge - Harz - Flechtinger Scholle - Lausitz) . In: Journal of Geological Sciences . 30, 2002, pp. 77-117.
- ↑ D. Lotsch: Tertiary . In: GH Stork (ed.): ERA Morsleben project. Geological site description . Federal Office for Radiation Protection, 1998 (accessed on February 29, 2016).
- ↑ Ulrich Saucke, Jochen Rommel, Josef Brauns: The geology of the Elbe . In: Written contributions to the conference "Morphodynamics of the Elbe" (conference proceedings) . 1999, p. 50. Retrieved February 29, 2016.
- ↑ Jürgen Knüpfer: Geological explanation of the Kulk and its surroundings . Gommern rock garden. Archived from the original on March 4, 2016. Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Retrieved February 29, 2016.
