General Assembly Vienna EGU 2011 4015 6 April
General Assembly, Vienna EGU 2011 -4015 6 April 2011 Tracing the closure of Neotethys from the Alps to Western Turkey I: The Sava-Izmir-Ankara suture zone Kamil Ustaszewski 1, Daniel Bernoulli 2, Bernhard Fügenschuh 3, Liviu Matenco 4, Roland Oberhänsli 5, Senecio Schefer 2, Stefan M. Schmid 6 1) GFZ Potsdam 2) University Basel 3) University Innsbruck 4) VU Amsterdam 5) University Potsdam 6) ETH Zürich See also: Poster XL 310, EGU 2011 -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. 1
Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section 2 Schmid et al. , in prep.
Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Sava Izmir 3 Schmid et al. , in prep.
Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section Sava Izmir Schmid et al. 2008 Neotethys: closure at the Cretaceous – Paleogene boundary 4 Schmid et al. , in prep.
Plate tectonic setting 2. collision 3. extension 4. Neotectonics 5. Cross section 1 2 3 Schmid et al. 2008 Neotethys: closure at the Cretaceous – Paleogene boundary 5 Schmid et al. , in prep.
1. Sava Zone 2. Dinarides cross section 3. W Turkey Thrust ages C C C E Eocene C Latest Cretaceous J Late Jurassic J C C E E J E Sava Zone ‘type locality’ E Ustaszewski et al. 2010 6
1. Sava Zone 2. Dinarides cross section 3. W Turkey 7 Ustaszewski et al. 2010
1. Sava Zone 2. Dinarides cross section Late Cretaceous magmatism & flysch 3. W Turkey 8 Ustaszewski et al. 2010
1. Sava Zone 2. Dinarides cross section 3. W Turkey Late Cretaceous ophiolites 81 -82 Ma Late Jurassic Western Vardar ophiolites 158 Ma 9 Ustaszewski et al. 2009
1. Sava Zone 2. Dinarides cross section 3. W Turkey Maastrichtian turbiditic sandstones & shales = “Sava Flysch” 10 Ustaszewski et al. 2010
1. Sava Zone 2. Dinarides cross section 3. W Turkey 2 100 km Schmid et al. , 2008 11
1. Sava Zone 2. Dinarides cross section 3. W Turkey 2 Internal Adriatic platform: pelagic limest. (Tr. ), radiolarites (Early-Mid Jur. ) & ophiolites obducted in Late Jurassic Adriatic Plate External Adriatic platform: mostly neritic limestones 100 km Schmid et al. , 2008 Polarity of coherent Adriatic shelf from proximal to distal See also: Schefer et al. , Geologica Carpathica, 2010 12
1. Sava Zone 2. Dinarides cross section Lower Plate = Adriatic margin Drina-Ivanjica composite Jadar-Kopaonik nappe: composite nappe: includes obducted includes W-Vardar ophiolites obducted W-Vardar suture Sava Zone ophiolites & flysch Top SW Adriatic 3. W Turkey Upper Plate = Europe Carpatho-Balkan orogen incl. obducted E-Vardar & Transylvanian ophiolites Top E Plate 100 km Ophiolites of the Dinarides form part of composite nappes but not sutures! East Bosnian. Durmitor composite nappe: includes obducted W-Vardar ophiolites 13
1. Sava Zone 2. Dinarides cross section 3. W Turkey Obduction ≠ Suturing Meliata Vardar Ustaszewski et al. 2009, modified Vardar Sava Schmid et al. . 2008 Coleman 1981 14
1. Sava Zone 2. Dinarides cross section 3. W Turkey Okay & Altiner 2007 (modified) 15
1. Sava Zone 2. Dinarides cross section 3. W Turkey Conclusions 1. Sava-Izmir-Ankara Suture Zone is the only End-Cretaceous Neotethys suture between Europe & Adria 2. 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. , 2009, Lithos Ustaszewski et al. , 2010, Tectonics 16
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Bonus material 18
1. Sava Zone Biostratigraphy Contusotruncana patelliformis GANDOLFI Pillow basalts intercalated with scaglia rossa Ustaszewski et al. 2009 2. Dinarides cross section U-Pb dating 3. W Turkey Nd-Sr isotopy Early Campanian (81 -82 Ma) intraoceanic magmatism 19
1. Sava Zone 2. Dinarides cross section Late Cretaceous intra-oceanic magmatism & subsequent metamorphism 3. Conclusions 20
1. Sava Zone 2. Dinarides cross section 3. Conclusions Ustaszewski et al. 2010 21
1. Sava Zone 2. Dinarides cross section 3. Conclusions Late Cretaceous metapelites P ≈ 5 - 7 kbar T ≈ 550 - 630 °C 22
1. Sava Zone 2. Dinarides cross section 3. Conclusions Geochronology 58 Peak-T: between 70. 6 & 65 Ma 23
1. Sava Zone 2. Dinarides cross section 3. Conclusions 24
1. Sava Zone 2. Dinarides cross section Regional cross section 3. Conclusions 25
1. Sava Zone 2. Dinarides cross section Dinarides 3. Conclusions Sava Zone suture MOHO from Horvath et al. 2006 Adria in lower-plate position 26
1. Sava Zone 2. Dinarides cross section 1. 70 -65 Ma 3. Conclusions Time intervals of fault activity End Cretaceous thrusts … 27
1. Sava Zone 2. ≥ 40 -26 Ma 2. Dinarides cross section 3. Conclusions Time intervals of fault activity … propagate into the foreland during the Paleogene 28
1. Sava Zone 3. 25 -14 Ma 2. Dinarides cross section 3. Conclusions Time intervals of fault activity Supradetachment basin … extensional reactivation of suturing thrust as low angle detachment … 29
1. Sava Zone 4. 14 -5 Ma 2. Dinarides cross section 3. Conclusions Time intervals of fault activity … in conjunction with Pannonian Basin subsidence 30
1. Sava Zone 2. Dinarides cross section 3. Conclusions present Sava Zone Ustaszewski et al. 2008 31
1. Sava Zone 2. Dinarides cross section 20 Ma BP 3. Conclusions Subduction polarity between Alps and Dinarides switches across Mid-Hungarian Fault Zone Sava Zone Ustaszewski et al. 2008 32
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