Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps

Emilie Bruand, Kurt Stuewe, Alexander Proyer

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In the Kor-, Saualpe and Pohorje regions of the Eastern Alps eclogite bodies occur within metapelitic gneisses. The bodies are between 1 meter and several hundreds of meters in size and some of them were defined by Hauy (1822) as the type locality for the rock type "eclogite". A growing body of petrological work has documented the metamorphic evolution of the metapelites surrounding the eclogites. However, few phase diagrams have been constructed for the eclogite bodies themselves. Here we use recently available activity models for amphiboles to present new thermodynamic pseudosections for the Hohl locality of the Koralpe eclogites. We show that this eclogite reached peak conditions in a narrow PT field obliquely oriented in PT space between 16.5 and 20.5 kbar and 620A degrees C to 720A degrees C and that its metamorphic evolution was likely to have occurred under water saturated conditions. We conclude that eclogite and the surrounding metapelites have certainly undergone the same metamorphic peak in Eo-alpine time. Comparison of our results with different PT estimates on the eclogite from Pohorje, suggest that a PT gradient from Koralpe to Pohorje is likely.
Original languageEnglish
Pages (from-to)75-87
Number of pages13
JournalMineralogy and Petrology
Volume99
Issue number1-2
DOIs
Publication statusPublished - 2010

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Amphibole Asbestos
eclogite
Phase diagrams
Rocks
Thermodynamics
Water
modeling
metapelite
amphiboles
type locality
amphibole
thermodynamics
diagram
phase diagrams
rocks
gradients
estimates
rock
water

Cite this

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title = "Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps",
abstract = "In the Kor-, Saualpe and Pohorje regions of the Eastern Alps eclogite bodies occur within metapelitic gneisses. The bodies are between 1 meter and several hundreds of meters in size and some of them were defined by Hauy (1822) as the type locality for the rock type {"}eclogite{"}. A growing body of petrological work has documented the metamorphic evolution of the metapelites surrounding the eclogites. However, few phase diagrams have been constructed for the eclogite bodies themselves. Here we use recently available activity models for amphiboles to present new thermodynamic pseudosections for the Hohl locality of the Koralpe eclogites. We show that this eclogite reached peak conditions in a narrow PT field obliquely oriented in PT space between 16.5 and 20.5 kbar and 620A degrees C to 720A degrees C and that its metamorphic evolution was likely to have occurred under water saturated conditions. We conclude that eclogite and the surrounding metapelites have certainly undergone the same metamorphic peak in Eo-alpine time. Comparison of our results with different PT estimates on the eclogite from Pohorje, suggest that a PT gradient from Koralpe to Pohorje is likely.",
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Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps. / Bruand, Emilie; Stuewe, Kurt; Proyer, Alexander.

In: Mineralogy and Petrology, Vol. 99, No. 1-2, 2010, p. 75-87.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Pseudosection modelling for a selected eclogite body from the Koralpe (Hohl), Eastern Alps

AU - Bruand, Emilie

AU - Stuewe, Kurt

AU - Proyer, Alexander

PY - 2010

Y1 - 2010

N2 - In the Kor-, Saualpe and Pohorje regions of the Eastern Alps eclogite bodies occur within metapelitic gneisses. The bodies are between 1 meter and several hundreds of meters in size and some of them were defined by Hauy (1822) as the type locality for the rock type "eclogite". A growing body of petrological work has documented the metamorphic evolution of the metapelites surrounding the eclogites. However, few phase diagrams have been constructed for the eclogite bodies themselves. Here we use recently available activity models for amphiboles to present new thermodynamic pseudosections for the Hohl locality of the Koralpe eclogites. We show that this eclogite reached peak conditions in a narrow PT field obliquely oriented in PT space between 16.5 and 20.5 kbar and 620A degrees C to 720A degrees C and that its metamorphic evolution was likely to have occurred under water saturated conditions. We conclude that eclogite and the surrounding metapelites have certainly undergone the same metamorphic peak in Eo-alpine time. Comparison of our results with different PT estimates on the eclogite from Pohorje, suggest that a PT gradient from Koralpe to Pohorje is likely.

AB - In the Kor-, Saualpe and Pohorje regions of the Eastern Alps eclogite bodies occur within metapelitic gneisses. The bodies are between 1 meter and several hundreds of meters in size and some of them were defined by Hauy (1822) as the type locality for the rock type "eclogite". A growing body of petrological work has documented the metamorphic evolution of the metapelites surrounding the eclogites. However, few phase diagrams have been constructed for the eclogite bodies themselves. Here we use recently available activity models for amphiboles to present new thermodynamic pseudosections for the Hohl locality of the Koralpe eclogites. We show that this eclogite reached peak conditions in a narrow PT field obliquely oriented in PT space between 16.5 and 20.5 kbar and 620A degrees C to 720A degrees C and that its metamorphic evolution was likely to have occurred under water saturated conditions. We conclude that eclogite and the surrounding metapelites have certainly undergone the same metamorphic peak in Eo-alpine time. Comparison of our results with different PT estimates on the eclogite from Pohorje, suggest that a PT gradient from Koralpe to Pohorje is likely.

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DO - 10.1007/s00710-009-0097-7

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