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Compression des lithosphères continentales "chaudes". Application à la tectonique précambrienne

Abstract : Many ancient orogens, involving convergence of juvenile lithospheres, present peculiar features that are difficult to interpret in terms of collision between stiff plates, in particular: (1) HT metamorphic conditions at relatively shallow crustal levels, (2) limited occurrence of juxtaposed units with contrasting metamorphic histories, (3) large areas marked by flat-lying fabrics and stretching lineations at high angle to the bulk shortening direction, (4) transpressive shear zones marked by steeply-dipping foliations, involving important vertical stretch. A field study of two Paleoproterozoic domains in Finland, combined with analogue models argue that compression of weak lithospheres favours distributed crustal thickening where flow of the ductile crust allows for burial of supracrustal units, lateral escape and potential gravity spreading. The limited strain localisation during shortening is consistent with distributed reliefs and exhumation of HT-LP rocks mainly driven by erosion.
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Submitted on : Monday, February 12, 2007 - 1:49:53 PM
Last modification on : Thursday, January 14, 2021 - 11:38:12 AM
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  • HAL Id : tel-00130486, version 1



Florence Cagnard. Compression des lithosphères continentales "chaudes". Application à la tectonique précambrienne. Géologie appliquée. Université Rennes 1, 2005. Français. ⟨tel-00130486⟩



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