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Communication Dans Un Congrès Année : 2021

The surface response to Cenozoic drip tectonics in central Anatolia

Clay Campbell
Michael Taylor
  • Fonction : Auteur
Megan Mueller
  • Fonction : Auteur
Faruk Ocakoğlu
  • Fonction : Auteur
Andreas Möller
  • Fonction : Auteur
K. Christopher Beard
  • Fonction : Auteur

Résumé

Lithospheric dripping is commonly invoked to reconcile the rapid surface uplift of orogenic plateaus. Rapid surface uplift results in the development or strengthening of pre-existing orographic barriers, which motivates changes in climate and intensifies precipitation gradients across front ranges. In turn, focused precipitation increases erosion rates and generates relief. Thus, understanding when, where, and how quickly lithospheric dripping events occurred within the broader Central Anatolian Plateau has important implications for the development of topography through time, which directly influences speciation, basin architecture, and the distribution of natural resources. Here, we propose that the present-day physiography of the broader Central Anatolian Plateau is in part a result of a ~10,000 km2 lithospheric foundering event from 37–35 Ma along the Izmir-Ankara-Erzincan suture zone in the Çankiri basin region, and a more recent ~40,000 km2 event that occurred within the Konya basin region of the more southerly Tauride Block. In detail, marine sedimentation within the Çankiri basin transitions to purely terrestrial deposition from 42–37 Ma, defined by a ~1 km thick section of interfingering fluvial and evaporite-bearing lacustrine deposits until 32 Ma. Shortly after 32 Ma the Çankiri basin was structurally inverted. A basin-wide unconformity bevels structurally inverted terrestrial sequences above which multi-meter, thick and gnarled Miocene evaporite sequences are present. West of the Çankiri basin, Miocene adakite-like magmatism initiated within the Galatean Volcanic Province as contractional deformation transitioned to strike-slip tectonics. Furthermore, we observe a rapid decrease in detrital zircon εHf values at ~37 Ma followed by a rapid increase at ~35 Ma, which we interpret as additional evidence for the rapid growth and removal of a lithospheric welt. Further south, previously published full-waveform tomography suggests the Konya basin region of the Tauride Block (i.e., the Central Anatolian Plateau strictly speaking), is underlain by a region of anomalously fast seismic velocities at ~40 km depth, above which a semi-rigid, fault-bound, ~1km high, low-relief, internally drained, diamond-shaped depression is present – broadly consistent with lithospheric dripping analogs from the Bolivian Altiplano.

Domaines

Tectonique
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Dates et versions

hal-03534539 , version 1 (19-01-2022)

Identifiants

  • HAL Id : hal-03534539 , version 1

Citer

Clay Campbell, Michael Taylor, Megan Mueller, Alexis Licht, Faruk Ocakoğlu, et al.. The surface response to Cenozoic drip tectonics in central Anatolia. American Geophysical Union Fall Meeting (AGU 2021), Dec 2021, New Orleans, United States. ⟨hal-03534539⟩
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