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Evolution of the Ötztal-Stubai, Scarl-Campo and Ulten Basement Units

  • G. Hoinkes
  • M. Thöni

Abstract

The Austro-Alpine basement, between the Tauern window to the E and the Western Alps to the W, treated in this contribution may be divided into three subunits due to differing lithology and metamorphic history. These three subunits, the Ötztal-Stubai-, the Scarl-Campo- and the Ulten basement, are divided by two major tectonic lines, the Schlinig line (ÖtztalStubai/Scarl-Campo) and the Peio line (Scarl-Campo/Ulten). Although each of the three units consists of quartzo-feldspatic and pelitic metasediments, acid to intermediate metamagmatites, in addition to metabasites and metacarbonates, the dominant rock types of the Ötztal-Stubai-, the Campo- and the Ulten-unit are metasediments. The Scarl unit however is mainly composed of acid metamagmatites. Ages of the acid magmatic protoliths are most probably Variscan in the Scarl unit and Caledonian in the Ötztal-Stubai unit.

Additional characteristic features of the three subunits are: pre-Variscan eclogites in the Ötztal-Stubai-, Late-Variscan pegmatites in the Campo and Variscan metaperidotites in the Ulten-units. In terms of pre-Alpine metamorphic evolution the Ötztal-Stubaiand Scarl-Campo-units suffered from common, medium to high grade, metamorphic conditions (with relics of high-pressure conditions), whereas the Ulten unit shows indications of very high grade (granulite facies) conditions.

In Alpine times the Ötztal-Stubai and Scarl-Campo basement units were both overprinted with increasing intensity from northwest to southeast, whereas the Ulten zone shows almost no Alpine metamorphism.

Keywords

Contrib Mineral Petrol Metamorphic Event White Mica Metamorphic Evolution Austroalpine Unit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • G. Hoinkes
  • M. Thöni

There are no affiliations available

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