EN    FR  
You are hereUNIL > Institute of Earth Sciences > Research > Stefan Schmalholz > Pinch-and-swell structures

Pinch-and-swell structures

Pinch-and-swell structures form in layered, ductile rocks due to layer-parallel extension (Figure 1). Pinch-and-swell structures can only form in rocks whose deformation behaviour is non-linear and, for example, described by a power-law or exponential flow law. In rocks having a linear viscous rheology, pinch-and-swell structures cannot form. Therefore, pinch-and-swell structures provide important information of the palaeorheology, i.e. the rheology of the rock when the pinch-and-swell structure was formed. To better understand pinch-and-swell formation and to be able to better constrain rheology from observed structures we study pinch-and-swell formation with numerical simulations based on the finite element method (Figure 2).
 

Figure 1: Pinch-and-swell structures in calc-silicate rocks (dark) embedded in marble (Adamello, Italy).

 

Figure 2: Finite element simulation of pinch-and-swell structures.

 

Search:
 inside this site:
   
   
 Go
 
rss/atom

Collaborations
Raymond Fletcher
Dani Schmid

Géopolis - CH-1015 Lausanne  - Switzerland  -  Tel. +41 21 69243 06  -  Fax +41 21 69243 05
Swiss University