Syn‑deformational melt percolation through a high‑pressure orthogneiss and the exhumation of a subducted continental wedge (Orlica‑Śnieżnik Dome, NE Bohemian Massif)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000085" target="_blank" >RIV/00025798:_____/20:00000085 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s00531-020-01838-4" target="_blank" >https://link.springer.com/article/10.1007/s00531-020-01838-4</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00531-020-01838-4" target="_blank" >10.1007/s00531-020-01838-4</a>
Alternative languages
Result language
angličtina
Original language name
Syn‑deformational melt percolation through a high‑pressure orthogneiss and the exhumation of a subducted continental wedge (Orlica‑Śnieżnik Dome, NE Bohemian Massif)
Original language description
High-pressure granitic orthogneiss of the south-eastern Orlica–Śnieżnik Dome (NE Bohemian Massif) shows relics of a shallow-dipping foliation, reworked by upright folds and a mostly pervasive N–S trending subvertical axial planar foliation. Based on macroscopic observations, a gradual transition from banded to schlieren and nebulitic orthogneiss was distinguished. All rock types comprise plagioclase, K-feldspar, quartz, white mica, biotite and garnet. The transition is characterized by increasing presence of interstitial phases along like-like grain boundaries and by progressive replacement of recrystallized K-feldspar grains by fine-grained myrmekite. These textural changes are characteristic for syn-deformational grain-scale melt percolation, which is in line with the observed enrichment of the rocks in incompatible elements such as REEs, Ba, Sr and K suggesting open-system behaviour with melt passing through the rocks. The P–T path deduced from the thermodynamic modelling indicates decompression from ~ 15−16 kbar and ~ 650–740 ºC to ~ 6 kbar and ~ 640 ºC. Melt was already present at the P–T peak conditions as indicated by the albitic composition of plagioclase in films, interstitial grains and in myrmekite. The variably re-equilibrated garnet suggests that melt content may have varied along the decompression path, involving successively both melt gain and loss. The ~ 6–8 km wide zone of vertical foliation and migmatite textural gradients is interpreted as vertical crustal-scale channel where the grain-scale melt percolation was associated with horizontal shortening and vertical flow of partially molten crustal wedge en masse.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA19-25035S" target="_blank" >GA19-25035S: Granulite–migmatite domes - insights to Devonian and Carboniferous evolution in the Variscan belt</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Earth Sciences
ISSN
1437-3254
e-ISSN
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Volume of the periodical
109
Issue of the periodical within the volume
4
Country of publishing house
DE - GERMANY
Number of pages
33
Pages from-to
1213-1246
UT code for WoS article
000520663800001
EID of the result in the Scopus database
2-s2.0-85082771928