High pressure melting of metagranitoids in continental subduction: implication for the Eger and Kutná hora crystalline complexes in Bohemian Massif

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F16%3A00000224" target="_blank" >RIV/00025798:_____/16:00000224 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

High pressure melting of metagranitoids in continental subduction: implication for the Eger and Kutná hora crystalline complexes in Bohemian Massif

Original language description

The Eger (ECC) and Kutná Hora crystalline complexes (KHC) in the Bohemian Massif are dominated by high-grade anatectic rocks as orthogneisses, migmatites, granites, felsic granulites and eclogites. They represent felsic orogenic lower crust that was exhumed during the Variscan orogeny at around 340 Ma. The ECC is part of the Saxothuringian zone and peak conditions for the anatectic gneisses and granulites were estimated at 650-720°C at 15-30 kbar, whereas KHC is situated in the Moldanubian zone and peak conditions for the anatectic gneisses and granulites were estimated at ca. 850°C at 15kbar. The rocks of ECC and KHC reveal textural variations from stromatic migmatite, inhomogeneous diatexite to isotropic granitic gneiss and granite reflecting different degree of migmatization. Field relationships suggest that these rocks represent a continuous textural sequence and are all derived from the same protolith, biotite-muscovite granite. In this study, we aim to understand timing, conditions, type and consequences of the high pressure partial melting in a subduction setting. We suggest that rocks in both units underwent localized melting at high pressure, with the felsic granulites representing a part of the system that was not hydrated at high pressure, therefore remained dry and did not undergo apparent melting. Resulting high pressure melts are granitic in composition, no further melting occurred during decompression in mid-crustal levels. Moreover, we suggest that the Kutná hora high-grade anatectic rocks are derived from the Saxothuringian protolith that was added to the bottom of the upper crust either by relamination or by plume-like ascent of previously subducted crust.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

DB - Geology and mineralogy

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

CETEG 2016 14th Meeting of the Central European Tectonic Group - Abstract Volume

ISBN

978-80-223-4071-7

ISSN

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e-ISSN

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Number of pages

2

Pages from-to

62-63

Publisher name

Univerzita Komenského Bratislava

Place of publication

Bratislava

Event location

Predná Hora Slovakia

Event date

Apr 28, 2016

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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