General Assembly, Vienna EGU2011-4015 6 April 2011 Tracing the closure of Neotethys from the Alps to Western Turkey I: The Sava-Izmir-Ankara suture zone Kamil Ustaszewski1, Daniel Bernoulli2, Bernhard Fügenschuh3, Liviu Matenco4, Roland Oberhänsli5, Senecio Schefer2, Stefan M. Schmid6 1) GFZ Potsdam 2) University Basel 3) University Innsbruck 4) VU Amsterdam 5) University Potsdam 6) ETH Zürich See also: Poster XL 310, EGU2011-4000 Stefan M. Schmid et al.: Tracing the closure of Neotethys from the Alps to Western Turkey II: Similarities and differences between Dinarides, Hellenides and Anatolides-Taurides.

Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Schmid et al., in prep.

Sava Izmir Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Sava Izmir Schmid et al., in prep.

Neotethys: closure at the Cretaceous – Paleogene boundary Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Schmid et al. 2008 Sava Izmir Neotethys: closure at the Cretaceous – Paleogene boundary Schmid et al., in prep.

Neotethys: closure at the Cretaceous – Paleogene boundary Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Schmid et al. 2008 1 2 3 Neotethys: closure at the Cretaceous – Paleogene boundary Schmid et al., in prep.

Sava Zone ‘type locality’ 2. Dinarides cross section 3. W Turkey C E Thrust ages Latest Cretaceous Eocene J Late Jurassic Sava Zone ‘type locality’ Ustaszewski et al. 2010

2. Dinarides cross section 3. W Turkey 1. Sava Zone 2. Dinarides cross section 3. W Turkey Ustaszewski et al. 2010

Late Cretaceous magmatism & flysch 1. Sava Zone 2. Dinarides cross section 3. W Turkey Late Cretaceous magmatism & flysch Ustaszewski et al. 2010

Late Cretaceous ophiolites Western Vardar ophiolites 1. Sava Zone 2. Dinarides cross section 3. W Turkey Late Cretaceous ophiolites 81-82 Ma Late Jurassic Western Vardar ophiolites 158 Ma Ustaszewski et al. 2009

Maastrichtian turbiditic sandstones & shales = “Sava Flysch” 1. Sava Zone 2. Dinarides cross section 3. W Turkey Maastrichtian turbiditic sandstones & shales = “Sava Flysch” Ustaszewski et al. 2010

2 100 km 1. Sava Zone 2. Dinarides cross section 3. W Turkey Schmid et al., 2008 100 km

Polarity of coherent Adriatic shelf from proximal to distal 1. Sava Zone 2. Dinarides cross section 2 3. W Turkey Internal Adriatic platform: pelagic limest. (Tr.), radiolarites (Early-Mid Jur.) & ophiolites obducted in Late Jurassic Adriatic Plate Schmid et al., 2008 100 km External Adriatic platform: mostly neritic limestones Polarity of coherent Adriatic shelf from proximal to distal See also: Schefer et al., Geologica Carpathica, 2010

1. Sava Zone 2. Dinarides cross section 3. W Turkey Lower Plate = Adriatic margin suture Upper Plate = Europe Drina-Ivanjica composite nappe: includes obducted W-Vardar ophiolites Jadar-Kopaonik composite nappe: includes obducted W-Vardar Sava Zone ophiolites & flysch Carpatho-Balkan orogen incl. obducted E-Vardar & Transylvanian ophiolites Top SW Top E Adriatic Plate East Bosnian- Durmitor composite nappe: includes obducted W-Vardar ophiolites 100 km Ophiolites of the Dinarides form part of composite nappes but not sutures!

Obduction ≠ Suturing Meliata Vardar Sava 1. Sava Zone 2. Dinarides cross section 3. W Turkey Meliata Vardar Sava Obduction ≠ Suturing Ustaszewski et al. 2009, modified Coleman 1981 Schmid et al.. 2008

2. Dinarides cross section 3. W Turkey 1. Sava Zone 2. Dinarides cross section 3. W Turkey Okay & Altiner 2007 (modified)

1. Sava Zone 2. Dinarides cross section 3. W Turkey Conclusions Sava-Izmir-Ankara Suture Zone is the only End-Cretaceous Neotethys suture between Europe & Adria Data from the Dinarides – Hellenides support a single-ocean concept Further reading: Schefer et al., 2010, Geologica Carpathica Schefer et al., 2010 in press, Int J Earth Sciences Schmid et al.. 2008, Swiss J Geosciences Ustaszewski et al., 2008, Swiss J Geosciences Ustaszewski et al., 2009, Lithos Ustaszewski et al., 2010, Tectonics 16

Bonus material

Early Campanian (81-82 Ma) intra-oceanic magmatism 1. Sava Zone 2. Dinarides cross section 3. W Turkey Pillow basalts intercalated with scaglia rossa Contusotruncana patelliformis GANDOLFI Biostratigraphy U-Pb dating Nd-Sr isotopy Early Campanian (81-82 Ma) intra-oceanic magmatism Ustaszewski et al. 2009

Late Cretaceous intra-oceanic magmatism & subsequent metamorphism 1. Sava Zone 2. Dinarides cross section 3. Conclusions Late Cretaceous intra-oceanic magmatism & subsequent metamorphism

1. Sava Zone 2. Dinarides cross section 3. Conclusions Ustaszewski et al. 2010

Late Cretaceous metapelites 1. Sava Zone 2. Dinarides cross section 3. Conclusions Late Cretaceous metapelites P ≈ 5 - 7 kbar T ≈ 550 - 630 °C

Peak-T: between 70.6 & 65 Ma Geochronology 58 1. Sava Zone 2. Dinarides cross section 3. Conclusions Geochronology 58 Peak-T: between 70.6 & 65 Ma

1. Sava Zone 2. Dinarides cross section 3. Conclusions

Regional cross section 1. Sava Zone 2. Dinarides cross section 3. Conclusions Regional cross section

Adria in lower-plate position 1. Sava Zone 2. Dinarides cross section 3. Conclusions Dinarides Sava Zone suture MOHO from Horvath et al. 2006 Adria in lower-plate position

Time intervals of fault activity End Cretaceous thrusts … 1. Sava Zone 2. Dinarides cross section 3. Conclusions 1. 70-65 Ma Time intervals of fault activity End Cretaceous thrusts …

Time intervals of fault activity 1. Sava Zone 2. Dinarides cross section 3. Conclusions 2. ≥40-26 Ma Time intervals of fault activity … propagate into the foreland during the Paleogene

Time intervals of fault activity Supradetachment basin 1. Sava Zone 2. Dinarides cross section 3. Conclusions 3. 25-14 Ma Time intervals of fault activity Supradetachment basin … extensional reactivation of suturing thrust as low angle detachment …

Time intervals of fault activity 1. Sava Zone 2. Dinarides cross section 3. Conclusions 4. 14-5 Ma Time intervals of fault activity … in conjunction with Pannonian Basin subsidence

present 1. Sava Zone 2. Dinarides cross section 3. Conclusions Ustaszewski et al. 2008

1. Sava Zone 2. Dinarides cross section 3. Conclusions 20 Ma BP Subduction polarity between Alps and Dinarides switches across Mid-Hungarian Fault Zone Sava Zone Ustaszewski et al. 2008