Abstract

A comprehensive correlation of the Caledonian nappe pile in northern Scandinavia is attempted for the first rime. The geology of a traverse through the nappes in a part of Troms, Norway, where the structural succession is more complete than elsewhere, forms the main basis for correlations to the northeast and southwest. Seven nappes or nappe complexes (designated 1 through 7, from bottom to top) are distinguished regionally from lat 67°N northward, and probable correlations to central Scandinavian nappes are mentioned. Stratigraphic and structural correlation criteria are emphasized. The nappe pile is shown to contain rock bodies of Ordovician-Silurian age interleaved with older ones that have at least partly undergone pre-Silurian Caledonian deformation and metamorphism; Precambrian units, some of which appear to be at least partially unaffected by Caledonian deformation and metamorphism, are also involved. The interleaving is mainly attributed to nappe tectonics. Most nappes were translated at least 200 to 400 km toward the east or southeast. Most independent movement of nappes 4 through 7 took place synmetamorphically during and shortly after the Middle to Late Silurian metamorphic peak. Major translation of nappe 3 occurred as a lateorogenic event. Nappes 1 and 2 were apparently emplaced before nappe 3, after Ordovician time.

First Page Preview

First page PDF preview
You do not currently have access to this article.