The newly determined Ar/Ar ages for the youngest Czech surface volcano

Železná hůrka (Eisenbühl) volcano near Cheb

Assoc. Prof. RNDr. Lukáš Krmíček, Ph.D. of the Institute of Geology of the Czech Academy of Sciences, v. v. i., together with his colleagues of the University of Potsdam (Universität Potsdam) presented new results of radioisotope dating of the Železná hůrka (Eisenbühl) volcano near Cheb at the Basalt 2017 conference. Based on the results of Ar/Ar step-heating of dark mica, the age of this volcano was shown to be "only" 400,000 years. Thus, the Železná hůrka represents the youngest Czech surface volcano. Volcanic activity in the vicinity of the Železná hůrka resulted in the formation of subsurface explosive maar-diatreme volcanic structures about 100 to 200 thousand years later. As yet, the "echoes" of volcanic activity in the Cheb area (similarly to the Yellowstone National Park in the USA) can be registered in the form of CO2 emanations accompanied by frequent earthquake swarms.