Tectonic significance of the Variscan suture between Brunovistulia and the Bohemian Massif
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000039" target="_blank" >RIV/00025798:_____/21:00000039 - isvavai.cz</a>
Result on the web
<a href="https://jgs.lyellcollection.org/content/early/2021/01/21/jgs2020-176" target="_blank" >https://jgs.lyellcollection.org/content/early/2021/01/21/jgs2020-176</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1144/jgs2020-176" target="_blank" >10.1144/jgs2020-176</a>
Alternative languages
Result language
angličtina
Original language name
Tectonic significance of the Variscan suture between Brunovistulia and the Bohemian Massif
Original language description
The Velké Vrbno Dome crops out at the boundary between the Brunovistulian Terrane and the internal parts of the Bohemian Massif. Here, eclogite boudins occur within an Ediacaran volcano-sedimentary sequence. Strong Nb depletion (Nb/Nb* = 0.19–0.82) combined with moderately positive Nd isotopic compositions (epsilonNd(i) = +3.89 – +5.77) is used to argue for emplacement of the eclogite protoliths in a transitional supra-subduction to continental-rift setting. Conversely, heterogeneously enriched large ion lithophile elements and highly radiogenic Sr isotopic ratios (87Sr/86Sr = 0.705–0.720) are interpreted to have been modified following fluid infiltration subsequent to eclogite-facies metamorphism.U–Pb laser ablation inductively coupled plasma mass spectrometry dating of magmatic zircon from the rift-type eclogite indicates Early Cambrian emplacement (c. 535 Ma) following episodic Ediacaran volcanic arc activity. Moreover, a continental setting is emphasized by zircon dating of a mylonitic orthogneiss, revealing a fragment of Palaeoproterozoic (c. 2000 Ma) basement, the first such finding within the Brunovistulian Terrane sensu stricto.The new data from eclogite confirm that rifting in this segment of Gondwana pre-dated the Ordovician opening of the Rheic Ocean and therefore that the suture between Brunovistulia and the rest of the Bohemian Massif likely represents the vestige of an older hyperextended basin or oceanic tract.
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
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of the Geological Society London
ISSN
0016-7649
e-ISSN
2041-479X
Volume of the periodical
178
Issue of the periodical within the volume
2 : jgs2020-176
Country of publishing house
GB - UNITED KINGDOM
Number of pages
15
Pages from-to
nestránkováno
UT code for WoS article
000614228200001
EID of the result in the Scopus database
2-s2.0-85103447580