Abstract
The Apuane Alps region of the Northern Apennines provides exceptionally clear exposures of continental margin rocks deformed during collision of the Corsica-Sardinia microplate with Italy. Detailed structural mapping reveals a large scale crustal shear zone in which major isoclinal folds were rotated as much as 90°, bringing their axes into parallelism with the direction of nappe transport. A large tectonic window through the allochthonous cover sequences exposes, in ascending structural order, the following sequences: (1) the Apuane metamorphic sequences, which have been repeatedly deformed and metamorphosed to greenschist fades. They consist of continental margin, sedimentary rocks of Permian to Oligocene age deposited on Paleozoic continental basement. (2) The Tuscan nappe, which consists of an essentially unmetamorphosed, and only slightly deformed sequence of similar lithologies and ages. The Tuscan nappe has been thrust over the Apuane metamorphic sequences along an evaporite layer. (3) The Liguride...
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