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    Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction

    213468_213468.pdf (2.962Mb)
    Access Status
    Open access
    Authors
    Eberlei, T.
    Johnson, Tim
    White, R.
    Roffeis, C.
    Stüwe, K.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Eberlei, T. and Johnson, T. and White, R. and Roffeis, C. and Stüwe, K. 2014. Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction. Journal of Metamorphic Geology. 32 (2): pp. 227-244.
    Source Title
    Journal of Metamorphic Geology
    DOI
    10.1111/jmg.12069
    ISSN
    0263-4929
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/3033
    Collection
    • Curtin Research Publications
    Abstract

    Forward and inverse mineral equilibria modelling of metapelitic rocks in the hangingwall and footwall of the Plattengneiss, a major shear zone in the Eastern Alps, are used to constrain their tectonometamorphic evolution and assess models for their exhumation. Forward (pseudosection) modelling of two metapelitic rocks suggests a steep clockwise P–T path with a near-isothermal decompression segment from a pressure peak at around 18–19 kbar and 670°C to the metamorphic peak at 680–720°C and 11–13 kbar. A subsequent decrease to 600–645°C and 8–9 kbar is inferred from the late growth of staurolite in some samples. Conventional thermobarometric calculations (inverse modelling) on 18 samples with the inferred peak assemblage garnet + plagioclase + muscovite + biotite + quartz + rutile ± ilmenite ± kyanite are associated with large 2s uncertainties, and absolute pressures calculated for all samples are statistically indistinguishable. However, calculations constraining relative pressure differences (?P) between samples sharing a common mineral assemblage are associated with much smaller uncertainties and yield pressure differences that are statistically meaningful. Although the overall pattern is complicated, the results suggest a pressure gradient of up to 3 kbar across the shear zone that is consistent with volume loss and a model of exhumation related to slab extraction for the Plattengneiss shear zone.

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