Thermobarometry, diffusion modelling and cooling rates of crustal garnet peridotites: Two examples from the Moldanubian zone of the Bohemian Massif

Medaris, L. Gordon; Wang, H.F.; Mísař, Z.; Jelínek, Emil

doi:10.1016/0024-4937(90)90014-r

Cited by 89 publications

(80 citation statements)

References 19 publications

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“…Newly proposed P -T path for the Gföhl gneiss in this study. For comparison, the P -T path of the Gföhl granulite (Carswell and O'Brien, 1993;Cooke and O'Brien, 2001) and the peak P -T conditions of garnet peridotite and kyanite -eclogite of the Nové Dvory body (Medaris et al, 1990;Nakamura et al, 2004) are inserted. P -T conditions inferred from the garnet core and the matrix stages of the Gföhl gneiss are also inserted.…”

Section: Discussionmentioning

confidence: 99%

“…Nové Dvory is located in the southeastern part of the Czech Republic, where a peridotite body intercalating with eclogite layers with/without kyanite occurs within the migmatitic gneiss of the Gföhl Unit (Medaris et al, 1990;Nakamura et al, 2004) (Fig. 1).…”

Section: Geological Setting and Petrographymentioning

confidence: 99%

“…In the Nové Dvory area of the Moldanubian Zone, garnet peridotite and associated kyanite -eclogite, showing peak P -T conditions of 4.5 -5.0 GPa and > 1000 °C (Medaris et al, 1990;Nakamura et al, 2004), occur as a lenticular body (approximately 1 km × 3 km) surrounded by Gföhl migmatitic gneisses (Fig. 1), from which no HP/UHP evidence has been reported, except for the occurrence of kyanite.…”

Section: Introductionmentioning

confidence: 99%

“…Fine - Figure 1. Geological sketch map of the Nové Dvory -Mohelno area (Medaris et al, 1990;Nakamura et al, 2004). The zircons used in this study were extracted from migmatitic gneiss around the Nové Dvory peridotite body in the Gföhl Unit.…”

Section: Geological Setting and Petrographymentioning

confidence: 99%

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Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

Kobayashi

Hirajima

Hiroi

et al. 2008

Journal of Mineralogical and Petrological Sciences

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The Raman spectroscopy of more than 2000 SiO 2 inclusions in zircon separates from Gföhl migmatitic gneisses in the Nové Dvory area shows that most of the SiO 2 inclusions are composed of quartz with clear and intense peaks at 464, 393, 266, 207 and 125 cm -1 . It also reveals that a few SiO 2 inclusions have a weak but clear peak at 521 cm -1 , which is the most fundamental vibration of coesite, along with typical quartz vibrations mentioned above. The Raman spectrum is composed of the intense vibrations of quartz at 464, 393 and 266 cm -1 of quartz and the weak vibration of coesite at 521 cm -1 is obtained from the quartz proximal to the relict coesite inclusion in the pyrope of ultra -high -pressure (UHP) rocks in Dora Maira Massif. A similar Raman spectrum has been obtained for quartz transformed from coesite in UHP rocks recovered from the CCSD drillhole of the Sulu belt, eastern China. Therefore, we propose that the SiO 2 phase whose Raman spectrum shows a weak vibration at 521 cm -1 existed as coesite in the past.

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Section: Discussionmentioning

confidence: 99%

Section: Geological Setting and Petrographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Geological Setting and Petrographymentioning

confidence: 99%

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Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

Kobayashi

Hirajima

Hiroi

et al. 2008

Journal of Mineralogical and Petrological Sciences

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“…The Gföhl unit mainly consists of felsic granulite and migmatitic Medaris et al (2006). (C) Geological sketch map of studied area simplified after Medaris et al (1990).…”

Section: Geological Settingmentioning

confidence: 99%

Sr-sulphate and associated minerals found from kyanite-bearing eclogite in the Moldanubian Zone of the Bohemian Massif, Czech Republic

Nakamura

Kobayashi

Shimobayashi

et al. 2010

Journal of Mineralogical and Petrological Sciences

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Sr -sulphate, celestine, was newly found in a kyanite -bearing eclogite associated with the Nové Dvory peridotite mass in the Moldanubian Zone of the Bohemian Massif, Czech Republic. Celestine is closely associated with anhydrite, pyrite, pyrrhotite and chalcopyrite, and those minerals occur in the matrix, where fine -grained omphacite aggregate and kelyphites after garnet develop. A common Sr reservoir in eclogite is known to be epidote, but the maximum pressure -temperature (P -T) conditions of the studied eclogite was estimated as about 1050 -1150 °C, 4.5 -4.9 GPa. In such extremely high P -T conditions, epidote should be unstable. In fact, epidote is absent from most of eclogites in the Moldanubian Zone of Czech Republic. These facts suggest that a Sr -reservoir after the epidote -breakdown in subducting eclogite might be celestine, or its high -P polymorph, although the formation stage of celestine in the study sample and maximum stability limits of celestine are not known. Another idea is that celestine in the study sample was formed at relatively shallow levels after the ascent of the eclogite. In this case, omphacite and apatite would have contained significant amount of Sr under the eclogitefacies conditions. Otherwise, metasomatic infiltration of Sr -rich fluids into the eclogite is necessary for the formation of celestine in order to provide sufficient amount of Sr. A Ba -rich alumino -silicate, probably celsian, was also found as a retrograde product around pyrrhotite in kelyphite and in symplectites mainly composed of augite and plagioclase after omphacite. Several grains of biotite are also present along the margin of garnet and in the symplectites after omphacite. In addition, small amounts of muscovite and amphibole are present in the symplectites after omphacite. These findings suggest that metasomatism with Sr -and Ba -rich fluids may have occurred during decompression of the eclogite and may not be indicative of the UHP history of these rocks.

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Metamorphic Evolution

Vrána¹,

Blümel²,

Petrakakis³

1995

Pre-Permian Geology of Central and Eastern Europe

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Thermobarometry, diffusion modelling and cooling rates of crustal garnet peridotites: Two examples from the Moldanubian zone of the Bohemian Massif

Cited by 89 publications

References 19 publications

Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

Determination of SiO2 Raman spectrum indicating the transformation from coesite to quartz in Gföhl migmatitic gneisses in the Moldanubian Zone, Czech Republic

Sr-sulphate and associated minerals found from kyanite-bearing eclogite in the Moldanubian Zone of the Bohemian Massif, Czech Republic

Metamorphic Evolution

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