A large sheetlike body of rock that has been moved a considerable distance above a thrust fault
Schematic overview of an eroded thrust system. The shaded material is the nappe. The erosional hole is called a window or fenster . The klippe is the isolated block of the nappe overlying autochthonous material.
In geology , a nappe or thrust sheet is a large sheetlike body of rock that has been moved more than 2 km (1.2 mi)[ 1] or 5 km (3.1 mi)[ 2] [ 3] above a thrust fault from its original position. Nappes form in compressional tectonic settings like continental collision zones or on the overriding plate in active subduction zones. Nappes form when a mass of rock is forced (or "thrust" ) over another rock mass, typically on a low angle fault plane. The resulting structure may include large-scale recumbent folds , shearing along the fault plane,[ 4] imbricate thrust stacks , fensters and klippes .
The term stems from the French word for tablecloth in allusion to a rumpled tablecloth being pushed across a table.[ 4]
^ Howell, J.V. (Editor) 1960: Glossary of geology and related sciences. American Geological Institute, Washington D.C., 325 p.
^ Marko, F., Jacko, S., 1999: Structural geology (General and systematic). Archived 2011-07-19 at the Wayback Machine ISBN 80-88896-36-3 Vydavateľstvo Harlequin, Košice, p. 81 - 93 (in Slovak)
^ Dennis, J. G., 1967, International tectonic dictionary. AAPG, Tulsa, p. 112
^ a b Twiss, Robert J. and Eldridge M. Moores, Structural Geology, W. H. Freeman, 1992, p. 236 ISBN 978-0716722526