Title: Evolution and origin of the Revsegg Nappe in the SW-Norwegian Caledonides: an allochthon with Ordovician elements
Abstract:Abstract The Revsegg Nappe is the uppermost tectonic unit of the Hardanger–Ryfylke Nappe Complex in the SW-Scandinavian Caledonides. The Revsegg Nappe consists mainly of two-mica schists with boudinag...Abstract The Revsegg Nappe is the uppermost tectonic unit of the Hardanger–Ryfylke Nappe Complex in the SW-Scandinavian Caledonides. The Revsegg Nappe consists mainly of two-mica schists with boudinaged lenses of sandstone, amphibolite, granodiorite and pegmatite. Analyses by U–Pb isotope dilution thermal ionization mass spectrometry on metamorphic zircon in a mafic lens and on rutile in a metasandstone reveal Ordovician ages of 471±18 and 480±15 Ma, respectively. Pegmatites intruded at 433±1 Ma, contemporaneously with rutile formation at the bottom of the nappe (434±6 Ma). Granodiorite intruded at 428±1 Ma, during or shortly before deformation of the biotite schists at c. 428–424 Ma. The specific lithology and the Ordovician imprint distinguish the Revsegg Nappe from the underlying crystalline nappes. The latter have characteristic indicative of a Baltic derivation whereas the Revsegg Nappe correlates better with nappes of Iapetan affinity, such as the Jæren Nappe south of Stavanger.Read More
Publication Year: 2013
Publication Date: 2013-09-24
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 9
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