The lithosphere-asthenosphere boundary in the Tien Shan-Karakoram region from S receiver functions: Evidence for continental subduction

2005 ◽  
Vol 32 (7) ◽  
pp. n/a-n/a ◽  
Author(s):  
P. Kumar ◽  
X. Yuan ◽  
R. Kind ◽  
G. Kosarev
Keyword(s):  
Receiver Functions ◽  
Tien Shan ◽  
Continental Subduction

scholarly journals Permian plume beneath Tarim from receiver functions

2018 ◽  
Author(s):  
Lev Vinnik ◽  
Yangfan Deng ◽  
Grigoriy Kosarev ◽  
Sergey Oreshin ◽  
Larissa Makeyeva
Keyword(s):  
Elevated Temperature ◽  
Spatial Coherence ◽  
Cumulative Effect ◽  
Receiver Functions ◽  
Tien Shan ◽  
Plate Motions ◽  
Siberian Traps ◽  
Order Of Magnitude ◽  
Mantle Layer ◽  
Similar Explanation

Abstract. Receiver functions for the central Tien Shan and northern Tarim in central Asia reveal a pronounced depression on the 410-km discontinuity beneath the Permian basalts in Tarim. The depression may most likely be caused by elevated temperature. The striking spatial coherence between the anomaly of the MTZ and the Permian basalts suggests that both may be effects of the same plume. This relation can be reconciled with reconstructed positions of paleo-continents since the Permian by assuming that the mantle layer which translated coherently with the Tarim plate extended to a depth of 410 km or more. Alternatively, lithosphere and the underlying mantle are decoupled at a depth of ~ 200 km, but a cumulative effect of the Tarim plate motions since the Permian is by an order of magnitude less than predicted by the paleo-reconstructions. A similar explanation is applicable to the Siberian traps.

Configuration of continental subduction beneath the Western Alps: results using forward modeling of receiver functions and gravity data

2021 ◽  
Author(s):  
Yuantong Mao ◽  
Liang Zhao ◽  
Anne Paul ◽  
Stefano Solarino ◽  
Coralie Aubert ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Gravity Data ◽  
Receiver Functions ◽  
Western Alps ◽  
Seismic Survey ◽  
Large Set ◽  
Geophysical Research ◽  
Continental Subduction ◽  
Significant Difference ◽  
The Difference

<p>The Alpine orogeny, which was formed by subduction of the European plate beneath the Adria plate, is considered as one of the world’s foremost natural laboratories for the study of orogenic processes. In contrast to other mountain belts, the Western Alpine belt is curved and affected by three-dimensional effects. Due to differences in stress distribution and rheological properties of crustal rocks, the Moho geometry and crustal structure along different sections differ, in particular in the vicinity of the continental subduction complex.</p><p>To better understand the configuration of continental subduction along a profile that crosscuts the North-Western Alps, we combine receiver function analysis with computation of synthetic receiver functions and gravity anomaly modeling to precise the subduction structures and estimate a crustal 2D shear wave velocity and density model. Seismic data come from the CIFALPS2 (China-Italy-France Alps seismic survey) temporary experiment, which operated from 2018 to 2020. We use a 2D hybrid waveform simulation method (Zhao et al., 2008) that is reliable and efficient and has a better response to 2D structures compared to conventional 1D waveform inversion methods, in particular for the dipping Moho interface of the subduction complex. We compute synthetic receiver functions for a large set of models compatible with surface geology data, which are then processed to obtain synthetic CCP depth-migrated stacks. Furthermore, we model the Bouguer gravity data along the same profile to obtain preferred density distribution. The nature of rocks in the subduction complex can be inferred from our synthetical models.</p><p>Compared to the results of the CIFALPS profile in the Central Western Alps (Zhao et al., 2015), the subduction along the CIFALPS2 profile has a shallower dip angle, which is a significant difference between the two sections. As for velocity and density models, the two sections have a high velocity and high-density wedge in the subduction complex. We argue that the reason for the difference in crustal structures between the two sections may be related to the difference in stress distribution.</p><p>Zhao, L., et al. (2008). "A two-dimensional hybrid method for modeling seismic wave propagation in anisotropic media." Journal of Geophysical Research <strong>113</strong>(B12).</p><p>Zhao, L., et al. (2015). "First seismic evidence for continental subduction beneath the Western Alps." Geology <strong>43</strong>(9): 815-818.</p>

Lithosphere and asthenosphere of the Tien Shan imaged by S receiver functions

2002 ◽  
Vol 29 (8) ◽  
pp. 32-1-32-4 ◽  
Author(s):  
Serge Oreshin ◽  
Lev Vinnik ◽  
Dmitry Peregoudov ◽  
Steve Roecker
Keyword(s):  
Receiver Functions ◽  
Tien Shan

scholarly journals Permian plume beneath Tarim from receiver functions

Solid Earth ◽  
2018 ◽  
Vol 9 (5) ◽  
pp. 1179-1185
Author(s):  
Lev Vinnik ◽  
Yangfan Deng ◽  
Grigoriy Kosarev ◽  
Sergey Oreshin ◽  
Larissa Makeyeva
Keyword(s):  
Elevated Temperature ◽  
Spatial Correlation ◽  
Cumulative Effect ◽  
Receiver Functions ◽  
Tien Shan ◽  
Plate Motion ◽  
Siberian Traps ◽  
Order Of Magnitude ◽  
Mantle Layer ◽  
Similar Explanation

Abstract. Receiver functions for the central Tien Shan and northern Tarim in central Asia reveal a pronounced depression on the 410 km discontinuity beneath the Permian basalts in Tarim. The depression may be caused by elevated temperature. The striking spatial correlation between the anomaly of the MTZ and the Permian basalts suggests that both may be effects of the same plume. This relation can be reconciled with the possible motion of Tarim on the order of 1000 km by assuming that the mantle layer, which has moved coherently with the plate since the Permian, extends to a depth of 410 km or more. Alternatively, the lithosphere and underlying mantle are decoupled at a depth of  ∼ 200 km, but a cumulative effect of the Tarim plate motion since the Permian is less by an order of magnitude. A similar explanation is applicable to the Siberian traps.

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