Description
A specific case of plastic and plastic/brittle deformation of strata in which valley downcutting and the associated removal of the overburden stress results in passive failure of formerly competent rocks and their subsequent upward deformation. This results in weaker rocks below the valley floor becoming stressed laterally and being forced upwards, becoming folded and faulted. The greatest deformation is usually concentrated on the alignment of the valley's lowest point.
Usually attributed to stress relief under periglacial conditions, caused by erosion of material along valley floors and frost-induced heave.
Category
Category of FEP
Sub-category
Sub-category of FEP
Ondraf Niras FEP Number
Ondraf Niras FEP Number
FEP Effects
Description of FEP Effects
Plastic deformation may change shape of host rock layer and its physical properties such as density, preferred orientation of host rock minerals and porosity.
Reference(s)
References Relevant to FEP
ER-184_I2 RD&D Plan
NEA TN2 IFEP Reference(s)
Related IFEPs from the NEA TN2 List of Proposed IFEP Revisions [NEA/RWM/R(2013)8]