From subduction channel to orogenic wedge: Exhumation recorded by orthogneiss microstructures in Erzgebirge, Bohemian Massif
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10435416" target="_blank" >RIV/00216208:11310/21:10435416 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8kHyCtENv" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=q8kHyCtENv</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.tecto.2021.229096" target="_blank" >10.1016/j.tecto.2021.229096</a>
Alternative languages
Result language
angličtina
Original language name
From subduction channel to orogenic wedge: Exhumation recorded by orthogneiss microstructures in Erzgebirge, Bohemian Massif
Original language description
The Erzgebirge dome, exposing Proterozoic - Early Palaeozoic metagranitoids and metasedimentary rocks of the Saxothuringian domain in the Bohemian Massif, is formed by a tectonic stack of several UHP-HP and HT units exhumed during Variscan continental subduction-collision process. A systematic study of orthogneiss deformation microstructures carried out on a regional scale has been done to evaluate the extent and relative structural position of these units in the subduction complex. Five different microstructural types have been distinguished, revealing two overprinting sequences with 1) coarse grained microstructures in the parautochthonous Katerina-Reitzenhain unit and 2) finer grained microstructures in the allochthonous HP-HT Gneiss Eclogite Unit. P-T conditions of the individual overprinting microstructures calculated by conventional thermobarometry suggest continuous deformation during exhumation along two contrasting P-T paths. The warmer one in the parautochthonous unit showed exhumation from similar to 13.5 kbar and similar to 820 degrees C to similar to 3 kbar and similar to 500 degrees C while the colder one in the allochthonous unit showed exhumation from similar to 16 kbar and similar to 740 degrees C to similar to 3 kbar and similar to 400 degrees C. The overprinting microstructures are associated with vertical shortening interpreted as ductile thinning. This deformation started at depths of similar to 10 kbar and led to a temporal elevation of the crustal heat flow affecting the exhumation P-T paths of the structurally deeper units. We propose a model of continuous underplating of the former accretionary wedge by deeply subducted and exhumed continental material building up the orogenic wedge. Progressive heating of the orogenic wedge is explained by heat advection related to fast exhumation of the UHP/HP-HT units from the subduction channel followed by ductile thinning.
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/GA17-22207S" target="_blank" >GA17-22207S: The role of inherited continental margin architecture on early Variscan convergence</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Tectonophysics
ISSN
0040-1951
e-ISSN
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Volume of the periodical
820
Issue of the periodical within the volume
neuvedeno
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
19
Pages from-to
229096
UT code for WoS article
000710178600001
EID of the result in the Scopus database
2-s2.0-85117688002