Receiver Function Mapping of the Mantle Transition Zone Beneath the Tian Shan Orogenic Belt

This study provides new constraints on the mantle transition zone (MTZ) structure under the Tian Shan orogenic belt in the context of the double‐sided subduction of the Junggar lithosphere and the Tarim lithosphere. The 410‐ and 660‐km discontinuities bordering the MTZ under the Tian Shan and its adjacent areas are mapped by stacking 68,361 receiver functions from 4,122 events recorded by 100 broadband seismic stations. Regional and large‐scale 3‐D velocity models are used to explain the effect of the laterally heterogeneous velocity anomalies. We identify a thickened MTZ of about 9.3 km under the eastern Tian Shan and the Darbut belt. This thickening indicates a lower temperature, which is correlated with the broken‐off subducted lithosphere or the delamination of the eastern Tian Shan lithosphere. We document the thinning of the MTZ caused by the depressed 410‐km discontinuity and the uplifted 660‐km discontinuity across the Tian Shan orogenic belt, Junggar Basin and Tarim Basin. This thinning corresponds to a + 100 K thermal anomaly in the MTZ, and we suggest that it may have been produced by thermal upwelling originating from the lower mantle. The slightly thinned MTZ beneath the Altai Mountains was caused by the uplift of these two discontinuities, which is related to the high‐velocity anomalies in the upper mantle and MTZ. In contrast, the thinned MTZ below the easternmost segment of the Tian Shan orogenic belt, formed by the depression of 6.5 km for the 410‐km discontinuity may indicate the presence of small‐scale mantle upwelling.

[1]  W. Xiao,et al.  Forced Cenozoic continental subduction of Tarim craton-like lithosphere below the Tianshan revealed by ambient noise tomography , 2022, Geology.

[2]  W. Xiao,et al.  Opposite facing dipping structure in the uppermost mantle beneath the central Tien Shan from Pn traveltime tomography , 2022, International Journal of Earth Sciences.

[3]  W. Xiao,et al.  Strong lateral heterogeneities of upper mantle shear-wave structures beneath the central and eastern Tien Shan , 2022, International Journal of Earth Sciences.

[4]  S. Pondrelli,et al.  Receiver function mapping of the mantle transition zone beneath the Western Alps: New constraints on slab subduction and mantle upwelling , 2022, Earth and Planetary Science Letters.

[5]  W. Griffin,et al.  Depletion of the upper mantle by convergent tectonics in the Early Earth , 2021, Scientific Reports.

[6]  Qingliang Wang,et al.  Active crustal deformation in the Tian Shan region, central Asia , 2021, Tectonophysics.

[7]  Stephen S. Gao,et al.  Slab Dehydration and Mantle Upwelling in the Vicinity of the Sumatra Subduction Zone: Evidence from Receiver Function Imaging of Mantle Transition Zone Discontinuities , 2020, Journal of Geophysical Research: Solid Earth.

[8]  Yixian Xu,et al.  Upper mantle tomography of the Western Junggar: Implications for its geodynamic evolution , 2020 .

[9]  Stephen S. Gao,et al.  Foundered lithospheric segments dropped into the mantle transition zone beneath southern California, USA , 2020 .

[10]  Stephen S. Gao,et al.  Upper mantle and mantle transition zone thermal and water content anomalies beneath NE Asia: Constraints from receiver function imaging of the 410 and 660 km discontinuities , 2019 .

[11]  Yixian Xu,et al.  The Deep Lithospheric Structure of the Junggar Terrane, NW China: Implications for Its Origin and Tectonic Evolution , 2019, Journal of Geophysical Research: Solid Earth.

[12]  Liming Wen,et al.  Crustal thickness and lithospheric thermal state beneath the Junggar Basin and adjacent Mountain Ranges, northwest China , 2019, Journal of Asian Earth Sciences.

[13]  Haiying Gao,et al.  Crustal and Upper Mantle Structure of the Tien Shan Orogenic Belt From Full‐Wave Ambient Noise Tomography , 2019, Journal of Geophysical Research: Solid Earth.

[14]  S. Zhong,et al.  Slab stagnation due to a reduced viscosity layer beneath the mantle transition zone , 2018, Nature Geoscience.

[15]  M. Santosh,et al.  Role of mantle dynamics in rebuilding the Tianshan Orogenic Belt in NW China: A seismic tomographic investigation , 2018 .

[16]  Guochun Zhao,et al.  Final amalgamation of the Tianshan and Junggar orogenic collage in the southwestern Central Asian Orogenic Belt: Constraints on the closure of the Paleo-Asian Ocean , 2017, Earth-Science Reviews.

[17]  J. Lei,et al.  Mantle transition zone discontinuities beneath the Tien Shan , 2017 .

[18]  J. Lei,et al.  Pn anisotropic tomography and mantle dynamics beneath China , 2016 .

[19]  Jianfeng Liu,et al.  Mantle Subduction and Uplift of Intracontinental Mountains: A Case Study from the Chinese Tianshan Mountains within Eurasia , 2016, Scientific Reports.

[20]  Yigang Xu,et al.  Plume‐orogenic lithosphere interaction recorded in the Haladala layered intrusion in the Southwest Tianshan Orogen, NW China , 2016 .

[21]  J. Lei,et al.  Pn anisotropic tomography under the entire Tienshan orogenic belt , 2015 .

[22]  Yigang Xu,et al.  Composition of the Tarim mantle plume: Constraints from clinopyroxene antecrysts in the early Permian Xiaohaizi dykes, NW China , 2015 .

[23]  V. Burtman.  Tectonics and geodynamics of the Tian Shan in the Middle and Late Paleozoic , 2015, Geotectonics.

[24]  M. Santosh,et al.  Petrogenesis of nephelinites from the Tarim Large Igneous Province, NW China: Implications for mantle source characteristics and plume–lithosphere interaction , 2015 .

[25]  Stephen S. Gao,et al.  Mantle transition zone discontinuities beneath the contiguous United States , 2014 .

[26]  M. Santosh,et al.  Crustal growth and tectonic evolution of the Tianshan orogenic belt, NW China: a receiver function analysis , 2014 .

[27]  B. Windley,et al.  Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage , 2013 .

[28]  Zhaojie Guo,et al.  Late Carboniferous collision between the Tarim and Kazakhstan-Yili terranes in the western segment of the South Tian Shan Orogen, Central Asia, and implications for the Northern Xinjiang, western China , 2011 .

[29]  J. Lei.  Seismic tomographic imaging of the crust and upper mantle under the central and western Tien Shan orogenic belt , 2011 .

[30]  I. Koulakov.  High-frequency P and S velocity anomalies in the upper mantle beneath Asia from inversion of worldwide traveltime data , 2011 .

[31]  Jie Zheng,et al.  The Role Played and Opportunities Provided by IGP DMC of China National Seismic Network in Wenchuan Earthquake Disaster Relief and Researches , 2010 .

[32]  You Tian,et al.  Mantle transition zone topography and structure beneath the central Tien Shan orogenic belt , 2010 .

[33]  Stefan M. Schmid,et al.  Reconciling plate-tectonic reconstructions of Alpine Tethys with the geological–geophysical record of spreading and subduction in the Alps , 2010 .

[34]  B. Tauzin,et al.  The mantle transition zone as seen by global Pds phases: No clear evidence for a thin transition zone beneath hotspots , 2008 .

[35]  D. Frost.  The Upper Mantle and Transition Zone , 2008 .

[36]  Min Sun,et al.  Middle Cambrian to Permian subduction-related accretionary orogenesis of Northern Xinjiang, NW China: Implications for the tectonic evolution of central Asia , 2008 .

[37]  Qi Wang,et al.  The deformation pattern and fault rate in the Tianshan Mountains inferred from GPS observations , 2008 .

[38]  D. Yuen,et al.  Small-scale convection in the upper mantle beneath the Chinese Tian Shan Mountains , 2007 .

[39]  J. Lei,et al.  Teleseismic P-wave tomography and the upper mantle structure of the central Tien Shan orogenic belt , 2007 .

[40]  D. Weidner,et al.  First principles investigation of the postspinel transition in Mg2SiO4 , 2007 .

[41]  A. Deuss.  Seismic observations of transition-zone discontinuities beneath hotspot locations , 2007 .

[42]  Biao Guo,et al.  Seismic tomography of the crust and upper mantle structure underneath the Chinese Tianshan , 2006 .

[43]  M. Sambridge,et al.  The Fast Marching Method: An Effective Tool for Tomographic Imaging and Tracking Multiple Phases in Complex Layered Media , 2005 .

[44]  A. Sano,et al.  Wet subduction versus cold subduction , 2005 .

[45]  Shaowen Liu,et al.  Shear wave splitting observations in the Chinese Tianshan orogenic belt , 2005 .

[46]  Lianchang Zhang,et al.  Paleozoic accretionary and collisional tectonics of the Eastern Tianshan (China): Implications for the continental growth of Central Asia , 2004 .

[47]  Junmeng Zhao,et al.  Lithospheric structure and dynamic processes of the Tianshan orogenic belt and the Junggar basin , 2003 .

[48]  Kelly H. Liu.  Effects of inelasticity on the apparent depth and detectability of seismic discontinuities in the mantle , 2003 .

[49]  Jianhua Liu,et al.  Crust and upper mantle structure beneath western China from P wave travel time tomography , 2002 .

[50]  J. Ritsema,et al.  Constraints on the correlation of P- and S-wave velocity heterogeneity in the mantle from P, PP, PPP and PKPab traveltimes , 2002 .

[51]  J. Avouac,et al.  Intracontinental subduction and Palaeozoic inheritance of the lithosphere suggested by a teleseismic experiment across the Chinese Tien Shan , 2002 .

[52]  C. Reigber,et al.  New space geodetic constraints on the distribution of deformation in Central Asia , 2001 .

[53]  P. Molnar,et al.  Seismic moments of major earthquakes and the rate of shortening across the Tien Shan , 2000 .

[54]  Guust Nolet,et al.  Slab temperature and thickness from seismic tomography: 1. Method and application to Tonga , 1999 .

[55]  Charles J. Ammon,et al.  Iterative deconvolution and receiver-function estimation , 1999 .

[56]  A. Sheehan,et al.  Mantle discontinuity structure from midpoint stacks of converted P to S waves across the Yellowstone hotspot track , 1997 .

[57]  E. Sobel,et al.  Thrusting and exhumation around the margins of the western Tarim basin during the India‐Asia collision , 1997 .

[58]  T. Herring,et al.  Relatively recent construction of the Tien Shan inferred from GPS measurements of present-day crustal deformation rates , 1996, Nature.

[59]  S. Graham,et al.  Sedimentary record and climatic implications of recurrent deformation in the Tian Shan: Evidence from Mesozoic strata of the north Tarim, south Junggar, and Turpan basins, northwest China , 1992 .

[60]  B. Kennett,et al.  Traveltimes for global earthquake location and phase identification , 1991 .

[61]  T. Katsura,et al.  The system Mg2SiO4‐Fe2SiO4 at high pressures and temperatures: Precise determination of stabilities of olivine, modified spinel, and spinel , 1989 .

[62]  Robert Tibshirani,et al.  Bootstrap Methods for Standard Errors, Confidence Intervals, and Other Measures of Statistical Accuracy , 1986 .