Abstract
Summary. Fold belts form due to shortening of deep basins on oceaic and continental crust. Basins on the oceanic crust should be characterized by a pronounced seismic anisotropy in the mantle lithosphere. Deep basins on the continental crust may develop from the stretching or the destruction of the lower crust under asthenospheric upwelling. These processes can produce seismic anisotropy in both the crust and mantle lithosphere. The character of the anisotropy is different for different basin forming processes. Considerable anisotropy should also arise from compression of the crust and mantle in fold belts. The formation of fold belts produces the original seismic anisotropy in continental lithosphere.
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