EGU22-11825
https://doi.org/10.5194/egusphere-egu22-11825
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The Norian magmatic rocks of Jabuka, Brusnik and Vis Islands (Croatia) and their bearing on the evolution of Triassic magmatism in the Adria Plate

Matteo Velicogna1, Marko Kudurna Prasek2, Luca Ziberna3, Angelo De Min3, Valentina Brombin4, Fred Jourdan5, Paul R. Renne6, and Andrea Marzoli1
Matteo Velicogna et al.
  • 1University of Padova, Department of Land, Environment, Agriculture and Forestry, Legnaro, Italy
  • 2McGill University, Department of Earth and Planetary Sciences (EPS), Montreal, Québec, Canada
  • 3University of Trieste, Department of Mathematics and Geosciences, Trieste, Italy
  • 4University of Ferrara, Department of Physics and Geoscience, Ferrara, Italy
  • 5Curtin University, School of Earth and Planetary Sciences, Perth, Australia
  • 6University of California, Berkeley, Department of Earth and Planetary Science, Berkeley, USA

The magmatic bodies of Jabuka, Brusnik, and Vis Islands of the Adriatic Sea are located in the easternmost part of the Adria Plate (Adriatic Unit according to Slovenec & Šegvić, 2021), close to the External Dinarides (Pamić and Balen, 2005). The magmatic rocks on the islands are, from West to East, intrusive bodies on Jabuka, sub-intrusive on Brusnik, and effusive rocks on Vis.

Feldspar separates from Jabuka and Brusnik Islands yielded mini-plateau 40Ar/39Ar ages of 229.0 ± 5.4 Ma and 221.5 ± 2.5 Ma indicating that this magmatism is Carnian-Norian in age. The whole-rock geochemical compositions (major and trace elements, Sr-Nd isotopes) indicate that the magmatic rocks of the Croatian Islands range from tholeiitic to calc-alkaline, yielding a subduction signature. This signature is also shared by coeval magmas from the Adria Plate and may be related to crustal components subducted during the Hercynian orogeny and recycled within the mantle source(s) of this anorogenic magmatism.

How to cite: Velicogna, M., Prasek, M. K., Ziberna, L., De Min, A., Brombin, V., Jourdan, F., Renne, P. R., and Marzoli, A.: The Norian magmatic rocks of Jabuka, Brusnik and Vis Islands (Croatia) and their bearing on the evolution of Triassic magmatism in the Adria Plate, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-11825, https://doi.org/10.5194/egusphere-egu22-11825, 2022.