Subrosion
In geology, subrosion (Latin: sub = under and rodere = to crush) denotes the underground leaching and transport of mostly easily soluble rock. On the other hand, there is erosion , which describes the erosion and displacement processes on the earth's surface.
Subrosion can be caused by seepage water or occur to a greater extent in the area of underground, groundwater-conducting horizons ( aquifers ). Salt -like rocks ( evaporites , for example rock salt or anhydrite and gypsum ), which can often be found in deposits of Zechstein from the Permian or in the Middle Muschelkalk of the Triassic , are particularly susceptible to subrosion . Even rocks that are more resistant to leaching, such as limestone, are eroded over time by subrosion, so that underground karst caves arise. The collapse of such cavities can lead to the formation of sinkhole lakes like the Arendsee . Especially in areas with strong karstification , subrosion can also be observed on the surface in the form of large troughs ( subrosion sinks) or sinkholes , which were created by breaking down rock into the cavities. The rocks that remain as a result of subrosion form the hat rocks in salt domes .
literature
- E. Seidl: Notch effect in technology. Notch effect in geology . In: Journal of the German Geological Society . tape 77 . Berlin 1925, p. 300-347 .
