摘要: Abstract The Variscan – Alleghanian orogen stretches from the southeastern United States to eastern Europe and fragments of it are also detected in northeastern Africa. has originally been produced by collision between Gondwana, Laurentian Baltic cratons, as well intervening microcontinents. As a result postorogenic erosion, superposed sedimentation Mesozic Tertiary rifting compressive episodes is divided into separated segments massifs. north-northwestern edge orogen, marked northern thrust deformation front, indicates tectonic transport north-northwest, while south-southeastern similarly delineated southern front shows south-southeast. This polarity strongest evidence for continental causing orogeny. Within fronts can be internides externides. characterized variable, but commonly high-grade metamorphism granitic intrusions. externides weakly metamorphosed, generally devoid granites, strongly affected overthrusting. have had similar features heavily overprinted Alpine structures. Several lines suggested collisional sutures. forms foundation Permo-Triassic deposits.
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