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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
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SYSNO ASEP 0478000 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název 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 Tvůrce(i) 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)Zdroj.dok. International Journal of Earth Sciences. - : Springer - ISSN 1437-3254
Roč. 106, č. 6 (2017), s. 2109-2129Poč.str. 21 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Cadomian magmatic arc ; Brunovistulian Domain ; Bohemian Massif ; Gondwana margin ; U–Pb geochronology ; geochemistry Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology Vědní obor RIV – spolupráce Geofyzikální ústav - Seismologie, vulkanologie a struktura Země Institucionální podpora GFU-E - RVO:67985530 ; GLU-S - RVO:67985831 UT WOS 000407925800015 EID SCOPUS 84994310348 DOI 10.1007/s00531-016-1416-y Anotace 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. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2018
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