Late Triassic acidic volcanic clasts in different Neotethyan sedimentary mélanges: paleogeographic and geodynamic implications

Szilvia Kövér, L. Fodor, Zoltán Kovács, Urs Klötzli, J. Haas, Norbert Zajzon, Csaba Szabó

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

U/Pb zircon dating and trace element geochemical analysis were performed on rhyolite clasts of different Middle Jurassic sedimentary mélanges from the Western Carpathian and Dinaric orogen. These igneous clast-bearing sedimentary successions were deposited on the westernmost passive margin of the Neotethys Ocean. During the latest Jurassic and Cretaceous, they became parts of different nappe stacks forming now the Inner Western Carpathians and some inselbergs within the Pannonian Basin. The Meliata nappe was stacked on the northern passive margin, while the Telekesoldal and Mónosbél nappes were part of the imbricated western–southwestern margin. U/Pb dating of the 100 m-sized rhyolite blocks and redeposited smaller clasts within the mélange, and fine-grained sediments formed two age groups: 222.6 ± 6.7 and 209.0 ± 9 Ma. Trace element geochemistry suggested within-plate continental volcanism as magma source. However, the measured ages are definitely younger than the classic, rift-related Anisian–Ladinian (238–242 Ma) magmatism, which was wide-spread along the western and southwestern margin of the Neotethys Ocean (e.g., Dolomites and different Dinaridic units). On the other hand, similarly, Late Triassic ages are reported from tuff intercalations from the Outer Dinarides and Western Carpathians, along with even more sparse effusive rocks of the Slovenian Trough. Trace element (incl. rare-earth element) analysis showed positive correlation between the mélange clasts and the in situ Late Triassic rhyolites of the Slovenian Trough. This newly established link between the mélange nappes in NE Hungary and the in situ Late Triassic rhyolites in the Slovenian Trough make a good opportunity to reconsider both Middle Jurassic paleogeography, and later tectonic deformations, which led to the separation of the source area and the redeposited clasts.

Original languageEnglish
JournalInternational Journal of Earth Sciences
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

nappe
clast
geodynamics
Triassic
trough
Jurassic
trace element
passive margin
inselberg
fine grained sediment
ocean
paleogeography
rhyolite
tuff
dolomite
magmatism
volcanism
zircon
rare earth element
geochemistry

Keywords

  • Geodynamic model
  • Late Triassic rifting
  • Neotethys Ocean
  • Rift-related magmatism
  • U–Pb ages

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Late Triassic acidic volcanic clasts in different Neotethyan sedimentary mélanges : paleogeographic and geodynamic implications. / Kövér, Szilvia; Fodor, L.; Kovács, Zoltán; Klötzli, Urs; Haas, J.; Zajzon, Norbert; Szabó, Csaba.

In: International Journal of Earth Sciences, 01.01.2018.

Research output: Contribution to journalArticle

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abstract = "U/Pb zircon dating and trace element geochemical analysis were performed on rhyolite clasts of different Middle Jurassic sedimentary m{\'e}langes from the Western Carpathian and Dinaric orogen. These igneous clast-bearing sedimentary successions were deposited on the westernmost passive margin of the Neotethys Ocean. During the latest Jurassic and Cretaceous, they became parts of different nappe stacks forming now the Inner Western Carpathians and some inselbergs within the Pannonian Basin. The Meliata nappe was stacked on the northern passive margin, while the Telekesoldal and M{\'o}nosb{\'e}l nappes were part of the imbricated western–southwestern margin. U/Pb dating of the 100 m-sized rhyolite blocks and redeposited smaller clasts within the m{\'e}lange, and fine-grained sediments formed two age groups: 222.6 ± 6.7 and 209.0 ± 9 Ma. Trace element geochemistry suggested within-plate continental volcanism as magma source. However, the measured ages are definitely younger than the classic, rift-related Anisian–Ladinian (238–242 Ma) magmatism, which was wide-spread along the western and southwestern margin of the Neotethys Ocean (e.g., Dolomites and different Dinaridic units). On the other hand, similarly, Late Triassic ages are reported from tuff intercalations from the Outer Dinarides and Western Carpathians, along with even more sparse effusive rocks of the Slovenian Trough. Trace element (incl. rare-earth element) analysis showed positive correlation between the m{\'e}lange clasts and the in situ Late Triassic rhyolites of the Slovenian Trough. This newly established link between the m{\'e}lange nappes in NE Hungary and the in situ Late Triassic rhyolites in the Slovenian Trough make a good opportunity to reconsider both Middle Jurassic paleogeography, and later tectonic deformations, which led to the separation of the source area and the redeposited clasts.",
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