Exhumation of subducted continental crust along the arc region
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000032" target="_blank" >RIV/00025798:_____/20:00000032 - isvavai.cz</a>
Alternative codes found
RIV/67985530:_____/20:00524938
Result on the web
<a href="https://doi.org/10.1016/j.gr.2019.10.011" target="_blank" >https://doi.org/10.1016/j.gr.2019.10.011</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.gr.2019.10.011" target="_blank" >10.1016/j.gr.2019.10.011</a>
Alternative languages
Result language
angličtina
Original language name
Exhumation of subducted continental crust along the arc region
Original language description
The Kutná Hora crystalline complex (KHCC) in the Bohemian Massif is a partially molten HP/HT complex adjacent to the magmatic arc. It is dominated by migmatite, orthogneiss and granulite with bodies of eclogite and peridotite. The KHCC migmatite consists of K-feldspar, plagioclase, quartz, phengite, biotite, garnet and kyanite. Melting conditions were estimated at 780 °C and >16 kbar and inferred melt volume varies between 1 to 4 vol percent. Peak temperature is 865 °C at 18–19 kbar followed by decompression in the presence of melt to 12–13 kbar and 770–800 °C. U-Pb monazite geochronology reveals a spread of ages between 550 Ma and 330 Ma. REE patterns show low Yb/Gd for 550−500 Ma, high Yb/Gd for ages at ~ 480 Ma, and decreasing Yb/Gd towards ~340 Ma. First monazite in equilibrium with garnet constrains the HP metamorphism to ~ 350 Ma, which is followed by recrystallization of monazite down to 325 Ma. U-Pb zircon geochronology displays an age range from ~ 670 Ma to ~ 430 Ma. The broad age range records a span of protolith crystallization and/or old metamorphism. The presence of HP ky+mu migmatite, their P–T path, protolith zircon and monazite metamorphic ages and whole-rock geochemistry are similar to HP migmatites in the Eger crystalline complex (ECC) in the Saxothuringian domain further in the west. We propose the following geodynamic scenario for subduction-relamination-exhumation mechanism: (i) subduction of the Saxothuringian continental lithosphere at 360 Ma related to early stage of trans-lithospheric diapirism triggered by arc-related magma weakening; (ii) large-scale emplacement of relaminant into the upper plate lithosphere at 350–340 Ma; and (iii) return flow of the relaminant along the subduction interface (the ECC) and emplacement of relaminant in the upper–middle crust in the rear part of the arc system (the KHCC) at 340–330 Ma.
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
Gondwana research
ISSN
1342-937X
e-ISSN
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Volume of the periodical
80
Issue of the periodical within the volume
April
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
30
Pages from-to
157-187
UT code for WoS article
000522974700007
EID of the result in the Scopus database
2-s2.0-85076032041