The Schwarzhorn Amphibolite (Eastern Ratikon, Austria): an Early Cambrian intrusion in the Lower Austroalpine basement

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Nilius, Nils-Peter; Froitzheim, Nikolaus; Nagel, Thorsten Joachim; Tomaschek, Frank; Heuser, Alexander: The Schwarzhorn Amphibolite (Eastern Ratikon, Austria): an Early Cambrian intrusion in the Lower Austroalpine basement. In: Geologica Carpathica 67 (2016), Nr. 2, S. 121-132. DOI: https://doi.org/10.1515/geoca-2016-0008

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To cite the version in the repository, please use this identifier: https://doi.org/10.15488/2025

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Sum total of downloads: 110




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Abstract: 
The Alpine nappe stack in the Penninic-Austroalpine boundary zone in the Ratikon (Austria) contains a 4x1 km tectonic sliver of meta-diorite, known as the Schwarzhorn Amphibolite. It was deformed and metamorphosed in the amphibolite facies and is unconformably overlain by unmetamorphic Lower Triassic sandstone, indicating pre-Triassic metamorphism. Cataclastic deformation and brecciation of the amphibolite is related to normal faulting and block tilting during Jurassic rifting. Zircon dating of the Schwarzhorn Amphibolite using LA-ICP-MS gave a U-Pb age of 529+9/-8 Ma, interpreted as the crystallization age of the protolith. Geochemical characteristics indicate formation of the magmatic protolith in a supra-subduction zone setting. The Cambrian protolith age identifies the Schwarzhorn Amphibolite as a pre-Variscan element within the Austroalpine basement. Similar calc-alkaline igneous rocks of Late Neoproterozoic to Early Cambrian age are found in the Upper Austroalpine Silvretta Nappe nearby and in several other Variscan basement units of the Alps, interpreted to have formed in a peri-Gondwanan active-margin or island-arc setting.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 89 80.91%
2 image of flag of Austria Austria 7 6.36%
3 image of flag of United States United States 3 2.73%
4 image of flag of France France 2 1.82%
5 image of flag of Switzerland Switzerland 2 1.82%
6 image of flag of South Africa South Africa 1 0.91%
7 image of flag of Sweden Sweden 1 0.91%
8 image of flag of Russian Federation Russian Federation 1 0.91%
9 image of flag of Europe Europe 1 0.91%
10 image of flag of Belgium Belgium 1 0.91%
    other countries 2 1.82%

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