Tectonic implications of fluvial incision and pediment deformation at the northern margin of the Central Anatolian Plateau based on multiple cosmogenic nuclides

Cengiz Yildirim*, Taylor F. Schildgen, Helmut Echtler, Daniel Melnick, Bodo Bookhagen, Attila Çiner, Samuel Niedermann, Silke Merchel, Martin Martschini, Peter Steier, Manfred R. Strecker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

We document Quaternary fluvial incision driven by fault-controlled surface deformation in the inverted intermontane Gökrmak Basin in the Central Pontide mountains along the northern margin of the Central Anatolian Plateau. In-situ-produced 10Be, 21Ne, and 36Cl concentrations from gravel-covered fluvial terraces and pediment surfaces along the trunk stream of the basin (the Gökrmak River) yield model exposure ages ranging from 7 ± 1 ka to 346 ± 45 ka and average fluvial incision rates over the past ∼350 ka of 0.28 ± 0.01 mm a-1. Similarities between river incision rates and coastal uplift rates at the Black Sea coast suggest that regional uplift is responsible for the river incision. Model exposure ages of deformed pediment surfaces along tributaries of the trunk stream range from 60 ± 5 ka to 110 ± 10 ka, demonstrating that the thrust faults responsible for pediment deformation were active after those times and were likely active earlier as well as explaining the topographic relief of the region. Together, our data demonstrate cumulative incision that is linked to active internal shortening and uplift of ∼0.3 mm a-1 in the Central Pontide orogenic wedge, which may ultimately contribute to the lateral growth of the northern Anatolian Plateau. Key Points active deformation at the northern margin of the Central Anatolian Plateau fluvial incision at the northern margin of the Central Anatolian Plateau Quaternary Uplift Rate at the northern margin of the Central Anatolian Plateau

Original languageEnglish
Pages (from-to)1107-1120
Number of pages14
JournalTectonics
Volume32
Issue number5
DOIs
Publication statusPublished - Sept 2013

Keywords

  • Fluvial Incision
  • Surface Exposure Age
  • Tectonic Geomorphology
  • Uplift Rate

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