MODELLING OF COMPRESSION AND EXTENSION OF THE CONTINENTAL LITHOSPHERE: TOWARDS REHABILITATION OF THE NECKING-LEVEL MODEL

Mikhailov, V.; Diament, M.; Stephenson, R.

Авторы: Mikhailov V., Diament M., Stephenson R.
Журнал: Journal of Geodynamics
Том: 50
Номер: 5
Год издания: 2010
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 368
Последняя страница: 380
DOI: 10.1016/j.jog.2010.04.007
Аннотация: In basin modelling the equation W(x,y)= -(z-zn)du/dx is in common use to link the horizontal component of velocity or displacement vector Ux to the vertical one (here is a necking level supposed to be flat in the absence of gravity). Attempts were made to link obtained estimates of to rheological profile of the lithosphere (e.g. Cloetingh et al., 1995) even some authors doubt that such relationships exist (Govers, Wortel, 1999). To resolve these questions, the problem of a small deformation of a thin inhomogeneous plate by forces applied to its side boundaries or to its base was solved analytically. It is shown that for such a plate is a function of the horizontal coordinate. It depends mostly on a relative distribution of mechanical properties with depth and slightly depends on the size of deforming region and the amount of strain. It is important that is almost flat under the region of main deformations, thus the problem’s solution can be closely approximated by replacing by constant equivalent flat necking level . We suggest different ways to estimate the depth interval for from the data on rheological stratification. Often this interval is rather narrow, thus the depth of does characterize rheological structure of the lithosphere. In the process of extension and compression of the continental lithosphere all boundaries including topography and the Moho deform. As a result, total disturbance of the isostatic equilibrium (specified as a load) usually is only a part of the topographic weight. Correct load estimates can be performed using the depth to the necking level. If there is no rigid layer below the Moho, the total load is close to zero. The final topography of lithospheric interfaces depends on both and effective flexural rigidity. The problem to estimate simultaneously these parameters and distribution of strain when topographies of all interfaces are given is unique but unstable. Possible way to make the problem stable is to estimate independently using solution obtained.
Добавил в систему: Михайлов Валентин Олегович

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MODELLING OF COMPRESSION AND EXTENSION OF THE CONTINENTAL LITHOSPHERE: TOWARDS REHABILITATION OF THE NECKING-LEVEL MODELстатья

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