Number of the records: 1
Long-lasting Cadomian magmatic activity along an active northern Gondwana margin: U-Pb zircon and Sr-Nd isotopic evidence from the Brunovistulian Domain, eastern Bohemian Massif
- 1.
SYSNO ASEP 0478000 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Long-lasting Cadomian magmatic activity along an active northern Gondwana margin: U-Pb zircon and Sr-Nd isotopic evidence from the Brunovistulian Domain, eastern Bohemian Massif Author(s) Soejono, I. (CZ)
Janoušek, V. (CZ)
Žáčková, E. (CZ)
Sláma, Jiří (GLU-S) SAI, RID, ORCID
Konopásek, J. (CZ)
Machek, Matěj (GFU-E) ORCID, RID
Hanžl, P. (CZ)Source Title International Journal of Earth Sciences. - : Springer - ISSN 1437-3254
Roč. 106, č. 6 (2017), s. 2109-2129Number of pages 21 s. Publication form Print - P Language eng - English Country DE - Germany Keywords Cadomian magmatic arc ; Brunovistulian Domain ; Bohemian Massif ; Gondwana margin ; U–Pb geochronology ; geochemistry Subject RIV DB - Geology ; Mineralogy OECD category Geology Subject RIV - cooperation Geophysical Institute - Siesmology, Volcanology, Earth Structure Institutional support GFU-E - RVO:67985530 ; GLU-S - RVO:67985831 UT WOS 000407925800015 EID SCOPUS 84994310348 DOI 10.1007/s00531-016-1416-y Annotation Cadomian magmatic complexes of the Brunovistulian Domain crop out at the eastern termination of the Bohemian Massif. However, the age, nature and geotectonic affinity of some of pre-Variscan (meta-)igneous rock complexes from this domain are still unknown. Geochronological and geochemical study of the granitic rocks across the Brunovistulian Domain reveals new information about the timing and nature of this magmatic activity originally situated along the northern margin of Gondwana. Zircon U-Pb data (601 +/- 3 Ma, Brno Massif, 634 +/- 6 Ma, paraautochtonous core of the Svratka Dome, 568 +/- 3 Ma, Bites orthogneiss) from the allochtonous Moravicum indicate the prolonged magmatic activity within the Brunovistulian Domain during the Ediacaran. The major- and trace-element and Sr-Nd isotopic signatures show heterogeneous geochemical characteristics of the granitic rocks and suggest a magmatic-arc geotectonic setting. The two-stage Depleted Mantle Nd model ages (c. 1.3-2.0 Ga) indicate derivation of the granitic rocks from a relatively primitive crustal source, as well as from an ancient and evolved continental crust of the Brunovistulian Domain. These results constrain the magmatic-arc activity to c. 635-570 Ma and provide a further evidence for a long-lived (at least c. 65 Myr) and likely episodic subduction-related magmatism at the northern margin of Gondwana. The presence of granitic intrusions derived from variously mature crustal sources at different times suggests heterogeneous crustal segments to having been involved in the magmatic-arc system during its multistage evolution. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2018
Number of the records: 1