Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00638964" target="_blank" >RIV/67985831:_____/25:00638964 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/25:00143284 RIV/00216305:26110/26:0200500
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0301926825002281" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0301926825002281</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.precamres.2025.107902" target="_blank" >10.1016/j.precamres.2025.107902</a>
Alternative languages
Result language
angličtina
Original language name
Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence
Original language description
The Brunovistulian microcontinent (BVM) represents the largest (up to 30 000 km2) geological unit of Proterozoic provenance in the eastern part of the Variscan collision zone in Central Europe. We present whole-rock, mineral and Sr–Nd–Pb–Hf isotope compositions of representative samples from exposures and deep boreholes (up to 3 km in depth) situated in the Czech part of the BVM. The oldest rocks are ∼ 740 Ma Tonian basic metavolcanic rocks and associated felsic dykes and metatuffs of the Metavolcanic Zone. Geochemical and isotope characteristics of these felsic rocks confirm that their parent melts were derived from the upper mantle, similar to their metabasite hosts. The Tonian (Pan-African) age of the Metavolcanic Zone and its MORB-like geochemical and isotope signature (87Sr/86Sr = 0.7027, ɛNd = +5.6, ɛHf = +10) reflect the main phase of rifting during breakup of Rodinia and subsequent formation of volcanic island arcs. Granitoids forming the two principal domains of the BVM, the Slavkov Domain situated to the NE, and the Thaya domain situated to the SW, both intruded during the dominant magmatic activity at ∼ 600 Ma. The Sr–Nd–Pb–Hf isotope compositions of granitoids of the Slavkov Domain are typical of relatively primitive volcanic arc magmas. Thus, the Slavkov Domain may represent an eroded relic of a juvenile Neoproterozoic volcanic arc that developed above a subduction zone, very probably at an active Gondwanan margin of the Tornquist Ocean. Possibility of slab breakoff during arc formation cannot be ruled out. In contrast, the Thaya Domain originated by melting of Proterozoic mature continental crust above the same subducting slab at the Gondwanan margin. During subduction, significantly older remnants of an island arc (∼655 Ma Metadiorite Zone) and MORB-like volcanic rocks (∼740 Ma Metavolcanic Zone) were accreted to the continental margin, leading to the assemblage of the Brunovistulian microcontinent. Based on the depleted mantle Nd model ages, the lithosphere of the BVM has retained an isotope signature similar to Avalonia.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Precambrian Research
ISSN
0301-9268
e-ISSN
1872-7433
Volume of the periodical
428
Issue of the periodical within the volume
September
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
23
Pages from-to
107902
UT code for WoS article
001565789100001
EID of the result in the Scopus database
2-s2.0-105013956478