Riedener tuff
Riedener Tuff , also called Riedener Tuffstein , is quarried near Rieden bei Mayen in the Vulkaneifel in a quarry in the state of Rhineland-Palatinate . It is a volcanic tuff that was formed from solidified volcanic ash. This rock was formed in the Quaternary .
geology
The Vulkaneifel is divided into the Hocheifel , West and East Eifel . The oldest volcanic eruptions took place around 45 to 24 million years ago in the Hocheifel. In the West Eifel, volcanism began again 700,000 years ago with the formation of cinder cones and maars . Volcanic activity began in the Eastern Eifel 500,000 years ago. 450,000 to 350,000 years ago, huge amounts of pumice and volcanic ash were emitted in the Rieden area , creating several tuffs, including the Riedener tuff.
The last major volcanic eruption in the Eifel occurred around 13,000 years ago at Lake Laacher . After that there was only one minor eruption that led to the formation of the Ulmener Maar 11,000 years ago .
The Riedener Kessel is located in the west of the Laacher volcanic field and the size of this tuff deposit extends to about 1.5 × 2.5 km. This tuff is quarried in a quarry in the Thürer Forest.
Rock description and mineral inventory
Riedener tuff is a fine to coarse-grained, bluish-green-gray leucitite tuff with individual components up to a size of 10 millimeters.
Riedener tuff has 79 percent solid components, 32 percent of which is glass, opaque and microlithic components; the rock fragments are 47 percent ( pumice , slate , sandstone , glass). 21 percent of its mineral inventory is augite, leucite , nepheline , nosean , sphen , and opaque components; its visible pore space is 21 percent.
use
It was used as a solid block, stair, floor and wall panels, window sills, tombs and for stone carving . As a useful rock, it is weather-resistant. The Marienkapelle in Rieden and other houses there are made of this stone. This natural stone is also used as an oven stone and is particularly suitable for this due to its fire resistance and heat storage capacity.
Similar rocks
Similar rocks can be found in other places in the Eifel. The Riedener tuff differs from the light beige Weiberner tuff and Ettringer tuff by its green color.
- Woman's tuff , by women
- Ettringer Tuff, near Ettringen
- Römertuff, at Kruft
literature
- Wolf-Dieter Grimm, picture atlas of important memorial stones of the Federal Republic of Germany , ed. from the Bavarian State Office for Monument Preservation, Lipp-Verlag. Munich 1990. ISBN 3-87490-535-7
Web links
- Illustration and technical data from Riedener Tuff at www.natursteineonline.com
- Anton Bermel, Our Tuff
- Sculptures made of Riedener Tuff (PDF file; 2.54 MB)
Individual evidence
- ↑ Hans-Ulrich Schmincke: Vulcanism . Scientific Book Society, Darmstadt 2000, ISBN 3-534-17471-2 .
- ↑ ( Page no longer available , search in web archives: Download Michael Mett's thesis from 2004, p. 10, on www.mpva.de ) (PDF file; 9.64 MB).
- ↑ Grimm: Bildatlas Denkmalgesteine, Gesteins No. 046 (see literature).
Coordinates: 50 ° 22 ′ 54.9 ″ N , 7 ° 11 ′ 11.9 ″ E