EN | Fun, Fun, Fun!! Do you like puzzles and untangling conundrums? Then, check out our proposed tectonic model to explain the tectonic regimes operating back in the Proterozoic (c. 2.0 Ga to 1.4 Ga), when the oldest supercontinent known today, Nuna, formed.
In this contribution, we combined previous structural and metamorphic studies with zircon Lu-Hf and new in-situ monazite Sm-Nd analyses in granitic rocks and discuss different classical Phanerozoic upper-plate delamination, slab break-off, and slab rollback and/or tearing tectonic models that however do not explain all the features observed in Mesoproterozoic NE Australia. Alternatively, we present a hybrid tectonic scenario between fast–hard Indian and slow–soft Aegean collision better explains the attributes of Mesoproterozoic NE Australia during Nuna assembly.
Authors: S.Volante, W.J.Collins, V.Barrote, A.R.Nordsvan, A.Pourteau, Z.-X.Li, J.Li, S.Beams