Transcript Presentation - Copernicus.org

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.
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
6
Ustaszewski et al. 2010
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
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
3. W Turkey
Upper Plate = Europe
Carpatho-Balkan orogen
incl. obducted E-Vardar &
Transylvanian ophiolites
Top E
100 km
Ophiolites of the Dinarides form part of
composite nappes but not sutures!
East BosnianDurmitor
composite nappe:
includes obducted
W-Vardar ophiolites
13
1. Sava Zone
2. Dinarides cross section
3. W Turkey
Obduction ≠ Suturing
Meliata
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., 2008, Swiss J Geosciences
Ustaszewski et al., 2009, Lithos
Ustaszewski et al., 2010, Tectonics
16
17
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
5
8
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