TY - JOUR A1 - Yang, Wei A1 - Dupont-Nivet, Guillaume A1 - Jolivet, Marc A1 - Guo, Zhaojie A1 - Bougeois, Laurie A1 - Bosboom, Roderic A1 - Zhang, Ziya A1 - Zhu, Bei A1 - Heilbronn, Gloria T1 - Magnetostratigraphic record of the early evolution of the southwestern Tian Shan foreland basin (Ulugqat area), interactions with Pamir indentation and India-Asia collision JF - Tectonophysics : international journal of geotectonics and the geology and physics of the interior of the earth N2 - The Tian Shan range is an inherited intracontinental structure reactivated by the far-field effects of the India-Asia collision. A growing body of thermochronology and magnetostratigraphy datasets shows that the range grew through several tectonic pulses since similar to 25 Ma, however the early Cenozoic history remains poorly constrained. The time-lag between the Eocene India-Asia collision and the Miocene onset of Tian Shan exhumation is particularly enigmatic. This peculiar period is potentially recorded along the southwestern Tian Shan piedmont. There, late Eocene marine deposits of the proto-Paratethys epicontinental sea transition to continental foreland basin sediments of unknown age were recently dated. We provide magnetostratigraphic dating of these continental sediments from the 1700-m-thick Mine section integrated with previously published detrital apatite fission track and U/Pb zircon ages. The most likely correlation to the geomagnetic polarity time scale indicates an age span from 20.8 to 13.3 Ma with a marked increase in accumulation rates at 19-18 Ma. This implies that the entire Oligocene period is missing between the last marine and first continental sediments, as suggested by previous southwestern Tian Shan results. This differs from the southwestern Tarim basin where Eocene marine deposits are continuously overlain by late Eocene-Oligocene continental sediments. This supports a simple evolution model of the western Tarim basin with Eocene-Oligocene foreland basin activation to the south related to northward thrusting of the Kunlun Shan, followed by early Miocene activation of northern foreland basin related to overthrusting of the south Tian Shan. Our data also support southward propagation of the Tian Shan piedmont from 20 to 18 Ma that may relate to motion on the Talas Fergana Fault. The coeval activation of a major right-lateral strike-slip system allowing indentation of the Pamir Salient into the Tarim basin, suggests far-field deformation from the India-Asia collision zone affected the Tian Shan and the Talas Fergana fault by early Miocene. (C) 2015 Elsevier B.V. All rights reserved. KW - Magnetostratigraphy KW - Cenozoic KW - Tian Shan KW - Pamir KW - Tarim Basin KW - Tectonics Y1 - 2015 U6 - https://doi.org/10.1016/j.tecto.2015.01.003 SN - 0040-1951 SN - 1879-3266 VL - 644 SP - 122 EP - 137 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Lu, Honghua A1 - Cheng, Lu A1 - Wang, Zhen A1 - Zhang, Tianqi A1 - Lu, Yanwu A1 - Zhao, Junxiang A1 - Li, Youli A1 - Zheng, Xiangmin T1 - Latest Quaternary rapid river incision across an inactive fold in the northern Chinese Tian Shan foreland JF - Quaternary science reviews : the international multidisciplinary research and review journal N2 - This work focuses on the incision process over the Tuostai anticline, a fold of the proximal structure Belt I in the northern Chinese Tian Shan foreland, where the Sikeshu River has incised deeply into the alluvial gravels and the fold's underlying bedrock strata. Field investigation and geomorphic mapping define five terraces of the Sikeshu River (designated as T1 to T5 from oldest to youngest) preserved within the Tuostai anticline. 10Be surface exposure dating and optically stimulated luminescence dating constrain stabilization of the highest three terrace surfaces at about 80 ka (T1), 16 ka (T2), and 15 ka (T3), respectively. Around 16 ka, the calculated river incision rates significantly increase from <2 mm/yr to >6 mm/yr. Undeformed longitudinal profiles of terraces T2, T3 and T4 over the Tuostai anticline suggest that this structure may have been tectonically inactive since stabilization of these three terraces. We thus think that the observed rapid river incision over the Tuostai anticline has not been largely forced by tectonic uplift. Instead, the progressively warmer and wetter palaeoclimatic condition within the Tian Shan range and its surrounding area during the period of ∼20–10 ka may have enhanced river incision across the Tuostai anticline. A reduced sediment/water ratio might have lowered the gradient of the Sikeshu River. KW - River incision KW - Fluvial terrace KW - Palaeoclimate KW - Late Quaternary KW - Tian Shan Y1 - 2017 U6 - https://doi.org/10.1016/j.quascirev.2017.10.017 SN - 0277-3791 VL - 179 SP - 167 EP - 181 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Lu, Honghua A1 - Wu, Dengyun A1 - Cheng, Lu A1 - Zhang, Tianqi A1 - Xiong, Jianguo A1 - Zheng, Xiangmin A1 - Li, Youli T1 - Late Quaternary drainage evolution in response to fold growth in the northern Chinese Tian Shan foreland JF - Geomorphology : an international journal on pure and applied geomorphology N2 - Alluvial units are important in understanding the interactions of antecedent drainage evolution with fold growth along the flanks of active orogenic belts. This is demonstrated by the Anjihai River in the northern Chinese Tian Shan foreland, which at present flows northward cutting sequentially through the Nananjihai anticline, the Huoerguos anticline, and the Anjihai anticline. Three episodes of alluviation designated as fans F-a, F-b, and F-c are identified for the Anjihai River. These three alluvial terrain features comprise a series of terraces, where the topographic characteristics, geomorphologic structure, and up-warped longitudinal profiles indicate continuous uplift and lateral propagation of the Halaande anticline and the Anjihai anticline over the past 50 Icy. Shortly after similar to 3.6 ka when the oldest terrace during the period of the fan Fb sedimentation was formed, significant rock uplift at the overlapping zone of the Anjihai anticline and the Halaande anticline led to the eastward deflection of the antecedent Anjihai River. A series of local terraces with elevation decreasing eastward indicate the gradual eastward migration of the channel of the Anjihai River during the period of the fan F-c sedimentation. Finally the Anjihai River occupied the previous course of the Jingou River when the latter was deflected eastward in response to rock uplift of the Anjihai anticline, presently flowing across the eastern tip of the Anjihai anticline. (C) 2017 Elsevier B.V. All rights reserved. KW - River course deflection KW - Fold growth KW - Late Quaternary KW - Tian Shan Y1 - 2017 U6 - https://doi.org/10.1016/j.geomorph.2017.09.037 SN - 0169-555X SN - 1872-695X VL - 299 SP - 12 EP - 23 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Bufe, Aaron A1 - Bekaert, David P. S. A1 - Hussain, Ekbal A1 - Bookhagen, Bodo A1 - Burbank, Douglas W. A1 - Jobe, Jessica Ann Thompson A1 - Chen, Jie A1 - Li, Tao A1 - Liu, Langtao A1 - Gan, Weijun T1 - Temporal changes in rock uplift rates of folds in the foreland of the Tian Shan and the Pamir from geodetic and geologic data JF - Geophysical research letters N2 - Understanding the evolution of continental deformation zones relies on quantifying spatial and temporal changes in deformation rates of tectonic structures. Along the eastern boundary of the Pamir-Tian Shan collision zone, we constrain secular variations of rock uplift rates for a series of five Quaternary detachment- and fault-related folds from their initiation to the modern day. When combined with GPS data, decomposition of interferometric synthetic aperture radar time series constrains the spatial pattern of surface and rock uplift on the folds deforming at decadal rates of 1-5mm/yr. These data confirm the previously proposed basinward propagation of structures during the Quaternary. By fitting our geodetic rates and previously published geologic uplift rates with piecewise linear functions, we find that gradual rate changes over >100kyr can explain the interferometric synthetic aperture radar observations where changes in average uplift rates are greater than similar to 1 mm/yr among different time intervals (similar to 10(1), 10(4-5), and 10(5-6) years). KW - InSAR KW - Tian Shan KW - folds KW - uplift rate changes KW - geologic versus geodetic rates KW - continental neotectonics Y1 - 2017 U6 - https://doi.org/10.1002/2017GL073627 SN - 0094-8276 SN - 1944-8007 VL - 44 SP - 10977 EP - 10987 PB - American Geophysical Union CY - Washington ER -