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File:Schwaebischer-Vulkan Neuffener-Steige-(Wendenberg) Schwaebische-Alb.jpg

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Deutsch: „Wendenberg E Vulkan” des „Schwäbischen Vulkans“. Tuff und glatte Weißjurawand eines kleinen Vulkanschlotes an der Neuffener Steige in 680m üNN, Durchmesser nur ca. 100m. Im Miozän (17-11 Mio Jahre) aktiver Vulkan vom Typ Phreatomagmatischer Eruption. In dem Aufschluss (neben einem aufgelassenen Steinbruch) kann man in geradezu idealer Weise sehen, dass der damals heiße Tuff ( Asche, Lapilli, Bomben) die Untere Felsenkalk-Formation (ki2, Malm delta) glatt durchschossen hat.
Beim Kontakt von Pyroklasten mit (Grund-)Wasser kam es zu gewaltigen Verdampfungs-Explosionen, so dass ein Trichter, wahrscheinlich auch ein Maar entstand (nach Millionen Jahren alles längst abgetragen). Das Weißjura-Deckgestein wurde bei den Explosionen zertrümmert. Die eher hellen, gröberen Fragmente im grauen Tuff (nicht der neuerdings ausgebrochene Kalkschutt) sind Fremdgestein von längst abgetragenen, höheren Weißjuraschichten, die in den heute kompaktierten Schlot zurück fielen.

English: “Wendenberg E Valcano”. Tuff and straight Upper-Jurassic of a small diatreme outcrop on the Swabian Alb in 680m. The rest of the diatreme forms a circle of ca. 100m. The volcano was active only in Miocene (17-11 Mill. years). It was a volcano with phreatomagmatic eruptions. This outcrop is the most illustrative example of the „Schwäbischer Vulkan“. It shows how the hot pyroclasts (ash, lapilli, volcanic bombs) blast the White Jurassic (Malm delta). The crude rock fragments in the gray volcanic Tuff (not the yellowish rubble) are foreign rocks, which were blast out but fell back.
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Author Ulrike
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(Reusing this file)		 explicit permission by Email , 28th August, 2015

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