Hat rock
Hutgestein (e) or gypsum hat ( engl. Cap rock ) is the name for the rock formations that form in the roof area of salt domes when the saline reaches the vicinity of the surface in the course of salt dome formation ( halokinesis ) and comes into contact there with salt-undersaturated groundwater . The water dissolves the particularly easily soluble components of the salinar (primarily the mineral halite ) ( subrosion ). What remains is what is known as residual rock made of gypsum , mudstone and possibly dolomite . The interface between the hat rock and the part of the salt dome not affected by subrosion is known as the salt level .
Cap rocks of a salt dome are z. B. on Kalkberg in Westeregeln open-minded.
In a study carried out by the Federal Institute for Geosciences and Raw Materials between 1994 and 1999 into the hat rocks of the Allertal salt structure , in which the Morsleben repository is located, various horizons of the Leine- and all-consequence of the Zechstein can be identified.
literature
- Christiane Martin, Manfred Eiblmaier (Ed.): Lexicon of Geosciences. In six volumes, Spektrum Akademischer Verlag, Heidelberg [et al.] 2000–2002.
- Hans Murawski, Wilhelm Meyer: Geological dictionary. 12th edition. Spektrum Akademischer Verlag, 2010, ISBN 978-3-8274-1810-4 , p. 74.