Origin of the Brunovistulian microcontinent: Geochemical and
Sr-Nd-Pb-Hf isotope evidence

J 2025

Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence

KRMÍČKOVÁ, Simona; Lukáš KRMÍČEK; Martin J. TIMMERMAN; Jiri SLAMA; Jitka MIKOVA et al.

Základní údaje

Originální název

Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence

Autoři

KRMÍČKOVÁ, Simona; Lukáš KRMÍČEK; Martin J. TIMMERMAN; Jiri SLAMA a Jitka MIKOVA

Vydání

PRECAMBRIAN RESEARCH, AMSTERDAM, ELSEVIER, 2025, 0301-9268

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.200 v roce 2024

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/25:00143284

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

Tonian-Ediacaran magmatism; Slavkov Domain; Metavolcanic Zone; Pre-variscan evolution; Radiogenic isotopes; Volcanic arc

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 14. 1. 2026 11:02, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Citovat

KRMÍČKOVÁ, Simona; Lukáš KRMÍČEK; Martin J. TIMMERMAN; Jiri SLAMA a Jitka MIKOVA. Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence. PRECAMBRIAN RESEARCH. AMSTERDAM: ELSEVIER, 2025, roč. 428, September, s. 1-23. ISSN 0301-9268. Dostupné z: https://doi.org/10.1016/j.precamres.2025.107902.

@article{2547001,
   author = {Krmíčková, Simona and Krmíček, Lukáš and Timmerman, Martin J. and Slama, Jiri and Mikova, Jitka},
   article_location = {AMSTERDAM},
   article_number = {September},
   doi = {https://doi.org/10.1016/j.precamres.2025.107902},
   keywords = {Tonian-Ediacaran magmatism; Slavkov Domain; Metavolcanic Zone; Pre-variscan evolution; Radiogenic isotopes; Volcanic arc},
   language = {eng},
   issn = {0301-9268},
   journal = {PRECAMBRIAN RESEARCH},
   title = {Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence},
   url = {https://doi.org/10.1016/j.precamres.2025.107902},
   volume = {428},
   year = {2025}
}

TY  - JOUR
ID  - 2547001
AU  - Krmíčková, Simona - Krmíček, Lukáš - Timmerman, Martin J. - Slama, Jiri - Mikova, Jitka
PY  - 2025
TI  - Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence
JF  - PRECAMBRIAN RESEARCH
VL  - 428
IS  - September
SP  - 1-23
EP  - 1-23
PB  - ELSEVIER
SN  - 03019268
KW  - Tonian-Ediacaran magmatism
KW  - Slavkov Domain
KW  - Metavolcanic Zone
KW  - Pre-variscan evolution
KW  - Radiogenic isotopes
KW  - Volcanic arc
UR  - https://doi.org/10.1016/j.precamres.2025.107902
N2  - 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.
ER  -

KRMÍČKOVÁ, Simona; Lukáš KRMÍČEK; Martin J. TIMMERMAN; Jiri SLAMA a Jitka MIKOVA. Origin of the Brunovistulian microcontinent: Geochemical and Sr-Nd-Pb-Hf isotope evidence. \textit{PRECAMBRIAN RESEARCH}. AMSTERDAM: ELSEVIER, 2025, roč.~428, September, s.~1-23. ISSN~0301-9268. Dostupné z: https://doi.org/10.1016/j.precamres.2025.107902.

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