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The Strandja arc: anatomy of collision after long-lived arc parallel tectonic transport. Boris Natal’in, Gursel Sunal, and Erkan Toraman Istanbul Technical University.

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the strandja arc anatomy of collision after long lived arc parallel tectonic transport

The Strandja arc: anatomy of collision after long-lived arc parallel tectonic transport

Boris Natal’in, Gursel Sunal, and Erkan Toraman

Istanbul Technical University

slide2
The basement of the Turan and Scythian platform consists of Permo-Triassic arc (red)-forearc (green) fragments bounded by dextral strike-slip faults
  • They belonged to the south-facing Silk Road arc evolving along the southern margin of Eurasia
problems
Problems
  • How far Asiatic structures can be traced in the west?
  • How large-scale strike-slip displacements were compensated in the western corner of the Paleo-Tethys?
main topics
Main topics
  • The Strandja massif is a long-lived Paleozoic-Triassic magmatic arc
  • The Strandja massif reveals a similarity with the tectonic units of the Scytho-Turanian orogenic system
  • Middle Jurassic-Early Cretaceous deformations record a passage of a triple junction and change of dextral motions to thrusting
slide8

cover

basement

290 Ma

312 Ma

315 Ma

257 Ma

detrital zircons from metasediments
Detrital zircons from metasediments

The source area was characterized by exposure of magmatic rocks of heterogeneous ages (460 to 1273 Ma) that is characteristic for a deeply eroded continental region.

inherited ages
Inherited ages
  • Long-lasted magmatic activity
  • There are no inherited zircons in the Permian granites
slide13
Chemical compositions of Carboniferous and Permian metagranite.Abbreviations: VAG- volcanic-arc granitoids, syn-COLG- syn-collisional granitoids, WPG- within plate granitoids, ORG- ocean-ridge granitoids.
regional correlations
Caucasus (Somin, 2000)-460-400 Ma-320-310 Ma-305-280 Ma-medial Carboniferous-Permian intermediate volcanics

Kunlun (Pan et al., 1996)-540-400 Ma-intermediate to mafic Carboniferous tuff and lava-260-200 Ma

Regional correlations

Gondwanian blocks: Menderes massif - 570-520 Ma orthogneisses - 635-605 Ma inherited ages

Strandja is a part of the Scytho-Turanian orogenic system

structural geology
Structural geology
  • D1 – Pre-Permian deformation
  • D2 – middle Jurassic-early Cretaceous deformation
  • D3 – pre-late Cretaceous
slide19

Structural column is overturned

basement

cover

cover

basement

  • Moderate southern dips of the S2 foliation
  • Steep dips of bedding
  • Increase of metamorphism to the south
age of s 2 foliation and l 2 lineation
Age of S2 foliation and L2 lineation
  • 40Ar/39Ar (muscovite and biotite): 151-167 Ma
  • Rb-Sr (muscovite): 149-162 Ma
  • Rb-Sr (biotite): 136-148 Ma
  • The Bathonian-Berriasian (middle Jurassic-early Cretaceous) time interval according to the International Stratigraphic Chart (UNESCO-IUGS, 2000)
slide28

Triple junction T of convergent plate boundaries. Oblique convergence of the plate B causes the development of NW-trending lineation l1 at point L lying on the plate A.

Migration of the triple junction from T0 to T1 brings the plate C into interaction with the plate A. NE-trending lineation l2 forms immediately after the passage of the triple junction across point L.

slide29

The plate A is Eurasia.

The plate B is the Tethyan ocean

The boundary AC is the Balkan fold-and-thrust belt. It has the northern vergence.

The boundary CB is the Jurassic-early Cretaceous Mandritsa arc (Bonev and Stampfli, 2003).

slide32

The NW-trending lineation must be older than NE and north-south trending lineations.

Preservations of two lineations:- at L1 earlier lineation will be destroyed;- point L2 represents the Strandja case;- at point L3 discrete shear zones produced by thrusting cut earlier penetrative lineation. The shear zone boundaries are sharp.

slide34

Conclusions

  • The Strandja massif represents a Paleozoic magmatic arc.
  • Inherited zircons in the Carboniferous orthogneisses record magmatic activity at 330-355 Ma and 420-440 Ma. Detrital zircons record magmatic activity between 460 and 650 Ma
  • The Strandja arc is a part of the Scytho-Turanian orogenic system
conclusions
Conclusions
  • Similar to the Scytho-Turanian orogenic system the Strandja arc presents evidence for the arc-parallel tectonic transport
  • Arc-parallel displacements terminated with collision of the Mandritsa arc in the medial Jurassic-early Cretaceous
  • Collisional deformation records a migration of the triple junction