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Contributions to Mineralogy and Petrology

, Volume 67, Issue 3, pp 305–315 | Cite as

Oxygen and hydrogen isotope study of the polymetamorphic area of the northern Ötztal-Stubai Alps (Tyrol)

  • S. Hoernes
  • H. Friedrichsen
Article

Abstract

123 mineral separates from 37 rock samples of the northern Ötztal-Stubai Alps have been analysed for their oxygen- and 38 minerals for their hydrogen isotopic composition. The results confirm that alpine metamorphism had little influence on the rocks of the crystalline basement. No large scale transport of water through the rocks of the crystalline basement occurred during the alpine event.

The temperature of alpine metamorphism did not exceed 530 °C, whereas the temperature of the prealpine metamorphic events was higher than 600 °C. The high temperatures of prealpine metamorphism are preserved in some 18O/16O mineral fractionations (mainly quartz/ilmenite), even in rocks which have partially reequilibrated during alpine metamorphism. The overprinting of the alpine metamorphism on the rocks of the crystalline basement and of the Schneebergerzug is indicated by oxygen isotope disequilibria which results in a large scatter of oxygen isotope temperatures. The main metamorphism of the rocks of the Schneebergerzug has to be related to a prealpine event.

Metamorphic textures of quartz indicate that recrystallization is the most important mechanism for the reequilibration of oxygen isotopes.

Keywords

Recrystallization Isotopic Composition Oxygen Isotope Mineral Fractionation Hydrogen Isotope 
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 1978

Authors and Affiliations

  • S. Hoernes
    • 1
  • H. Friedrichsen
    • 1
  1. 1.Mineralogisches Institut-Abteilung Geochemie-Wilhelmstr. 56TübingenFederal Republic of Germany

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