page_title: Sudetes
section_title: Volcanism and thermal waters
hierarchical_section_title: Sudetes / Geology / Volcanism and thermal waters
caption_attribution_description: Polski: Ostrzyca (501)- jeden ze szczytów Pogórza Kaczawskiego - wygasły wulkan English: Extinct volcano Ostrzyca (501 m) near Wleń, Lower Silesia, Poland.
context_page_description: The Sudetes are a mountain range in Central Europe. They are the highest part of Bohemian Massif. They stretch from the Saxon capital of Dresden in the northwest, to the Głubczyce plateau in Poland and to the Ostrava Basin and Moravian Gate in the Czech Republic in the east. Geographically the Sudetes are a Mittelgebirge with some characteristics typical of high mountains. Its plateaus and subtle summit relief makes the Sudetes more akin to mountains of Northern Europe than to the Alps.
  In the west, the Sudetes border with the Elbe Sandstone Mountains. The westernmost point of the Sudetes lies in the Dresden Heath, the westernmost part of the West Lusatian Hill Country and Uplands, in Dresden. In the east of the Sudetes, the Moravian Gate and Ostrava Basin separates from the Carpathian Mountains. The Sudetes' highest mountain is Mount Sněžka/Śnieżka, which is also the highest mountain of the Czech Republic, Bohemia, Silesia, and Lower Silesian Voivodeship, in the Krkonoše/Karkonosze Mountains, lying on the border between the Czech Republic and Poland. Mount Praděd in the Hrubý Jeseník Mountains is the highest mountain of Moravia.
context_section_description: There are remnants of lava flows and volcanic plugs in the Sudetes. The volcanic rocks making up these outcrops are of mafic chemistry and include basanite and represent episodes of volcanism in the Oligocene and Miocene periods. Volcanism affected not only the Sudetes but also parts of the Sudetic foreland being part of a SW-NE oriented Bohemo-Silesian Belt of volcanic rocks. Mantle xenoliths have been recovered from the lavas of a volcano at Ještěd-Kozákov Ridge in the Czech western Sudetes. These pyroxenite xenoliths arrived to surface from approximate depths of 35, 70 and 73 km and indicate a complex history for the mantle beneath the Sudetes.
  There are thermal springs in the Sudetes with measured temperatures of 29 to 44 °C. Drilling has revealed the existence of waters at 87 °C at depths of 2000 m. These modern waters are believed to be associated to the Late Cenozoic volcanism in Central Europe.
caption: Ostrzyca, an eroded volcano in the northern Sudetes.
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