BackgroundRodderberg, in the Rodderberg Volcanic Complex (RVC), is a late Pleistocene cinder cone on the west side of the Rhine River. The complex itself consists of a circular depression with a diameter of about 600 m, a feature that is interpreted to be the remnant of a maar crater (Paulick et al., 2009). This field most likely represents a distal feature of the East Eifel Volcanic Field. The eruption of Rodderberg occurred in two phases. The first was phreatomagmatic, producing xenolith-rich, poorly sorted deposits. The second phase was dominated by Strombolian activity, resulting in xenolith-poor, thick and well-sorted coarse scoria deposits (Paulick et al., 2009). Geochemistry reveals the rocks erupted from the RVC to be leucitic nephelinite. The total erupted volume of material from the RVC eruption is estimated to be about 1.0x10^-2 km3 of magma and 2-3x10^-2 km3 of tephra - a rough order of magnitude estimate. The RVC deposits were previously dated at 26,000-27,000 years before present (IAVCEI 1973), but more recent thermoluminescence data placed the eruption at around 300 ka, during a glacial period in central Europe (Paulick et al., 2009).
Smithsonian / GVP volcano information
Vent of the Rodderberg volcano complex near Bonn. (Photo: Tobias Schorr)
Basalt vent of the Rodderberg cinder cone (Photo: Tobias Schorr)
The cinder cone of Rodderberg volcano near Bonn is probably one of the youngest volcanic erution centres of the region! (Photo: Tobias Schorr)
View over the Rodderberg crater near Bonn and in the background the volcanoes of the region Siebengebirge (Photo: Tobias Schorr)
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