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Pre-Alpine eclogites in the Pennine Basement Complex of the Eastern Alps |
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| Authors: | G T R DROOP |
| Institution: | Department of Geology and Mineralogy, University of Oxford, Parks Road, Oxford, OX1 3PR |
| Abstract: | An occurrence of quartz-eclogite is described from the Inner Schieferhülle unit of the Pennine Basement Complex in the SE Tauern Window, Austria. Field relations strongly suggest a pre-Alpine age for the primary eclogitic mineral assemblage (garnet + omphacite + quartz + rutile). This implies that there was no connection between the formation of these eclogites and the late Cretaceous and Tertiary tectonic evolution of the Eastern Alps. The quartz-eclogite mineral assemblage crystallized under conditions of 620 ± 100°C and at pressures in excess of 12 kbar, and suffered amphibolitic overprinting of Alpine and possibly Hercynian age. A four-stage polymetamorphic history is proposed for the Inner Schieferhülle: |
| Keywords: | Key-words: eclogite polymetamorphism Tauern Window thermobarometry |