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

Charreau, Julien and Saint-Carlier, Dimitri and Lavé, Jérôme and Dominguez, Stéphane and Blard, Pierre-Henri and Avouac, Jean-Philippe and Brown, Nathan D. and Malatesta, Luca Claude and Shengli, Wang and Rhodes, Edward 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 . pp. 132-140. ISSN 0040-1951. https://resolver.caltech.edu/CaltechAUTHORS:20180228-085254520

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.tecto.2018.02.016DOIArticle
https://www.sciencedirect.com/science/article/pii/S0040195118300891PublisherArticle
ORCID:
AuthorORCID
Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:© 2018 Published by Elsevier B.V. Received date: 11 December 2017. Revised date: 21 February 2018. Accepted date: 25 February 2018. This study was financed by the French INSU/CNRS SYSTER program. We are grateful to the ASTER team for the cosmogenic nuclide concentration measurements (M. Arnold, G. Aumaître, K. Keddadouche, L. Léanni and F. Chauvet). The ASTER national AMS facility (CEREGE, Aix en Provence) is supported by the INSU/CNRS, the French Ministry of Research and Higher Education, IRD and CEA. We also thank Richard Heermance and Aurelia Hubert-Ferrari for their reading and contribution to the improvement of this manuscript. This is CRPG contribution n° 2565.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut de Recherche pour le Développement (IRD)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Subject Keywords:Tectonic; Shortening rates; Dushanzi Kuitun; Tianshan; Alluvial terrace; Growth-strata; Piedmont
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Centre de Recherches Pétrographiques et Géochimiques (CRPG)2565
Record Number:CaltechAUTHORS:20180228-085254520
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180228-085254520
Official Citation: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, Late Pleistocene acceleration of deformation across the northern Tianshan piedmont (China) evidenced from the morpho-tectonic evolution of the Dushanzi anticline, Tectonophysics, Volume 730, 2018, Pages 132-140, ISSN 0040-1951, https://doi.org/10.1016/j.tecto.2018.02.016.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84990
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Feb 2018 17:38
Last Modified:03 Oct 2019 19:25

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