With 13 figmesA b s t r a c t : The tectonic style of basement gneiss terrains is discussed and exemplified. The origin of migmatic domes and migmatite naps is explained as the result of secondary forces caused by horizontal flow in the infrastructure. The relationship between structural patterns in different dimensions is discussed.Z u s a m m e n f a s s u n g : Der tektonisdm $til der Gneisbildungen innerhalb der So&el wird an Hand von Beispielen dargelegt. Die Entstehung der Migmatit-Kuppeln und -Decken wird als Ergebnis yon Sekund~irkr~iften (lurch horizontaJes Fliel3en im Unterbau erkliirt. Das Verh~iltnis zwischen Bautypen verschiedener Gr6/3enordnungen wird besprochen.R 6 s u m ~ : PIusieurs exemples de style des terrains gneissiques des socles sont pr6sent6s et discut6s. L'origine des d6mes et des nappes de migmatites est consid6r6e comme le r6suttat de forces secondaires ayant comme cons6quence des ph6nom6nes d'6coulement dans l'infrastructure, Les rapports entre des types de structure d'ordre de grandeur diff6rente sont discut6s.,,Nur erst, wenn die Form klar ist, wird dir der Geist klar werden." R. SeHUHMANN
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