Very high-pressure (>4 GPa) eclogite associated with the Moldanubian Zone garnet peridotite (Nové Dvory, Czech Republic)

Daisuke Nakamura, M. Svojtka, K. Naemura, T. Hirajima

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Equilibrium pressure-temperature (P-T) conditions were estimated for kyanite-bearing eclogite from Nové Dvory, Czech Republic, by using garnet-clinopyroxene thermometry and garnet-clinopyroxene-kyanite-coesite (or quartz) barometry. The estimated P-T conditions are 1050-1150°C, 4.5-4.9 GPa, which are mostly the same as previously estimated values for garnet peridotite from Nové Dvory (∼1100-1250°C, 5-6 GPa). Such very high-P conditions, which correspond to about 150-km depth, have been obtained for some garnet peridotites in the Gföhl Unit of the Bohemian Massif, but pressure conditions of eclogites associated with the garnet peridotites have not been so well constrained. This is the first substantial finding of eclogite that gives such very high-P conditions in the Gföhl Unit of the Bohemian Massif. The Gföhl Unit mainly consists of felsic granulite or migmatitic gneiss, but these rock types do not display high-P (> 2.5 GPa) evidence. It is unclear whether both the peridotite body and surrounding felsic rocks in the Gföhl Unit were buried to very deep levels, but at least some garnet peridotites and associated eclogites in the Gföhl Unit have ascended from about 150-km depth.

Original languageEnglish
Pages (from-to)593-603
Number of pages11
JournalJournal of Metamorphic Geology
Volume22
Issue number6
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes

Fingerprint

Garnets
eclogite
peridotite
garnet
kyanite
clinopyroxene
Bearings (structural)
Rocks
barometry
coesite
Quartz
felsic rock
granulite
gneiss
temperature
quartz
Temperature
rock

Keywords

  • Bohemian Massif
  • Czech Republic
  • Eclogite
  • Geothermobarometer
  • Kyanite

ASJC Scopus subject areas

  • Geology

Cite this

Very high-pressure (>4 GPa) eclogite associated with the Moldanubian Zone garnet peridotite (Nové Dvory, Czech Republic). / Nakamura, Daisuke; Svojtka, M.; Naemura, K.; Hirajima, T.

In: Journal of Metamorphic Geology, Vol. 22, No. 6, 08.2004, p. 593-603.

Research output: Contribution to journalArticle

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abstract = "Equilibrium pressure-temperature (P-T) conditions were estimated for kyanite-bearing eclogite from Nov{\'e} Dvory, Czech Republic, by using garnet-clinopyroxene thermometry and garnet-clinopyroxene-kyanite-coesite (or quartz) barometry. The estimated P-T conditions are 1050-1150°C, 4.5-4.9 GPa, which are mostly the same as previously estimated values for garnet peridotite from Nov{\'e} Dvory (∼1100-1250°C, 5-6 GPa). Such very high-P conditions, which correspond to about 150-km depth, have been obtained for some garnet peridotites in the Gf{\"o}hl Unit of the Bohemian Massif, but pressure conditions of eclogites associated with the garnet peridotites have not been so well constrained. This is the first substantial finding of eclogite that gives such very high-P conditions in the Gf{\"o}hl Unit of the Bohemian Massif. The Gf{\"o}hl Unit mainly consists of felsic granulite or migmatitic gneiss, but these rock types do not display high-P (> 2.5 GPa) evidence. It is unclear whether both the peridotite body and surrounding felsic rocks in the Gf{\"o}hl Unit were buried to very deep levels, but at least some garnet peridotites and associated eclogites in the Gf{\"o}hl Unit have ascended from about 150-km depth.",
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AB - Equilibrium pressure-temperature (P-T) conditions were estimated for kyanite-bearing eclogite from Nové Dvory, Czech Republic, by using garnet-clinopyroxene thermometry and garnet-clinopyroxene-kyanite-coesite (or quartz) barometry. The estimated P-T conditions are 1050-1150°C, 4.5-4.9 GPa, which are mostly the same as previously estimated values for garnet peridotite from Nové Dvory (∼1100-1250°C, 5-6 GPa). Such very high-P conditions, which correspond to about 150-km depth, have been obtained for some garnet peridotites in the Gföhl Unit of the Bohemian Massif, but pressure conditions of eclogites associated with the garnet peridotites have not been so well constrained. This is the first substantial finding of eclogite that gives such very high-P conditions in the Gföhl Unit of the Bohemian Massif. The Gföhl Unit mainly consists of felsic granulite or migmatitic gneiss, but these rock types do not display high-P (> 2.5 GPa) evidence. It is unclear whether both the peridotite body and surrounding felsic rocks in the Gföhl Unit were buried to very deep levels, but at least some garnet peridotites and associated eclogites in the Gföhl Unit have ascended from about 150-km depth.

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