Late Pleistocene acceleration of deformation across the northern Tianshan piedmont (China) evidenced from the morpho-tectonic evolution of the Dushanzi anticline

Julien Charreau, Dimitri Saint-Carlier, Jérôme Lavé, Stéphane Dominguez, Pierre Henri Blard, Jean Philippe Avouac, Nathan D. Brown, Luca Claude Malatesta, Shengli Wang, Edward J. Rhodes

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We document the temporal evolution of deformation in the northern Tianshan piedmont where the deformation is partitioned across several thrusts and folds. We focus on the Dushanzi anticline, where abandoned terraces and growth strata allow us to constrain the history of folding since the Miocene. Based on subsurface seismic imaging, structural measurements and morphological analysis, we show that this anticline is associated with two decollement levels. We use kink band migration in growth strata dated by paleomagnetism to constrain the shortening from the Mio-Pliocene to the Holocene. Our results show that the Dushanzi anticline has been active since at least 8 Ma and that the fold grew at a steady shortening rate of 0.6 ± 0.1 mm/yr from 8 to ~1.5 Ma with possible variations from 2.5 to 1.5 Ma. Then it accelerated rapidly to a rate of 4.3 ± 1.0 mm/yr over at least the last 100 ka. These results, together with similar temporal shortening evolutions across other structures, suggest that the deformation rate across the eastern Tianshan piedmont increased relatively recently. This may reflect either a redistribution of the deformation from the internal structures toward the borders or a general acceleration of the deformation across the entire range.

Original languageEnglish
Pages (from-to)132-140
Number of pages9
JournalTectonophysics
Volume730
DOIs
Publication statusPublished - 4 Apr 2018

Keywords

  • Alluvial terrace
  • Dushanzi Kuitun
  • Growth-strata
  • Piedmont
  • Shortening rates
  • Tectonic
  • Tianshan

Fingerprint Dive into the research topics of 'Late Pleistocene acceleration of deformation across the northern Tianshan piedmont (China) evidenced from the morpho-tectonic evolution of the Dushanzi anticline'. Together they form a unique fingerprint.

  • Cite this

    Charreau, J., Saint-Carlier, D., Lavé, J., Dominguez, S., Blard, P. H., Avouac, J. P., Brown, N. D., Malatesta, L. C., Wang, S., & Rhodes, E. J. (2018). Late Pleistocene acceleration of deformation across the northern Tianshan piedmont (China) evidenced from the morpho-tectonic evolution of the Dushanzi anticline. Tectonophysics, 730, 132-140. https://doi.org/10.1016/j.tecto.2018.02.016