Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction
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 tw...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Wiley - Blackwell
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/3033 |
| _version_ | 1848744119142187008 |
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| author | Eberlei, T. Johnson, Tim White, R. Roffeis, C. Stüwe, K. |
| author_facet | Eberlei, T. Johnson, Tim White, R. Roffeis, C. Stüwe, K. |
| author_sort | Eberlei, T. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T05:56:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-3033 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T05:56:23Z |
| publishDate | 2014 |
| publisher | Wiley - Blackwell |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-30332017-09-13T14:32:14Z Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction Eberlei, T. Johnson, Tim White, R. Roffeis, C. Stüwe, K. slab extraction relative thermobarometry Exhumation Koralpe mineral equilibria modelling 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. 2014 Journal Article http://hdl.handle.net/20.500.11937/3033 10.1111/jmg.12069 Wiley - Blackwell fulltext |
| spellingShingle | slab extraction relative thermobarometry Exhumation Koralpe mineral equilibria modelling Eberlei, T. Johnson, Tim White, R. Roffeis, C. Stüwe, K. Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title | Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title_full | Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title_fullStr | Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title_full_unstemmed | Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title_short | Thermobarometric constraints on pressure variations across the Plattengneiss shear zone of the Eastern Alps: Implications for exhumation models during Eoalpine subduction |
| title_sort | thermobarometric constraints on pressure variations across the plattengneiss shear zone of the eastern alps: implications for exhumation models during eoalpine subduction |
| topic | slab extraction relative thermobarometry Exhumation Koralpe mineral equilibria modelling |
| url | http://hdl.handle.net/20.500.11937/3033 |