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Geological Society, London, Special Publications; 1981; v. 9; p. 79-98;
DOI: 10.1144/GSL.SP.1981.009.01.08
© 1981 Geological Society of London

I. Mechanics of Thrusts and Nappes

Mechanical model of thrust sheet gliding and imbrication

G. Mandl & G. K. Shippam

Koninklijke/Shell Exploratie en Produktie Laboratorium, Rijswijk, The Netherlands

A competent thrust sheet being pushed over incompetent substrata is idealized as an elastic block overriding a stack of perfectly plastic substrata. The stress fields induced in both the plastic substrata and the thrust sheet have been analysed for various thrust sheet dimensions and boundary conditions.

In the case of the plastic substrata the stress analysis accounts for the formation and location of a basal slip plane, its stepping-up to a higher gliding horizon, and for secondary faulting.

For the competent thrust sheets, finite-element analyses have located a well-defined spot where a push force of sufficient magnitude is likely to induce fracturing and, consequently, may control the formation of an imbrication thrust, assuming that faulting is not preceded by compressional folding. Some further conclusions are drawn with respect to the development and spacing of subsequent imbrication thrusts.





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[Abstract] [PDF]