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Pre‐Alpine eclogites in the Pennine Basement Complex of the Eastern Alps
Author(s) -
DROOP G. T. R.
Publication year - 1983
Publication title -
journal of metamorphic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.639
H-Index - 114
eISSN - 1525-1314
pISSN - 0263-4929
DOI - 10.1111/j.1525-1314.1983.tb00261.x
Subject(s) - eclogite , geology , overprinting , omphacite , geochemistry , basement , cretaceous , quartz , mineral , metamorphic rock , tectonics , paleontology , subduction , archaeology , history , materials science , metallurgy
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: