noun[mass noun] Geology
1A process in which some strata become partly detached from those underneath and slide over them, causing folding and deformation.
- Analogue and numerical modelling together with field studies show that these two end-members of decollement result in different deformation styles.
- Therefore we suggest that even though the sedimentary thickness variation may have played some role in differential propagation of the deformation front, the effect of the Hormuz salt decollement must have been more significant.
- Therefore, we attribute the formation of arc shapes in the model to differential propagation of the deformation front above two different types of decollement.
1.1 (also decollement zone) [count noun] A boundary separating deformed strata from underlying strata which are not similarly deformed.
- The sand cover deformed differently above the frictional and viscous decollements.
- These deflection zones are transpressional and show a general trend parallel to the initial boundary between the viscous and frictional decollements.
- The boundary between the viscous and frictional decollements in domain B was perpendicular to the shortening direction.
Mid 19th century: from French, from décoller 'unstick'.
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