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Crust and mantle of the Tien Shan from data of the receiver function tomography

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Abstract

A 3-D velocity model of the Tien Shan crust and upper mantle is constructed through the inversion of the receiver functions of P and S waves together with teleseismic traveltime anomalies at nearly 40 local seismic stations. It is found that in the vast central region, where no strong earthquakes have been known over the past century, the S wave velocity at depths of 10–35 km is lower than in adjacent regions by up to 10%. These data are evidence for mechanical weakness of the crust preventing the accumulation of elastic energy. Apparently, the lower velocity and the weakness of the crust are due to the presence of water. The weakness of the crust is one of the possible reasons for the strain localization responsible for the formation of the present Tien Shan but can also be due in part to the young orogenesis. The crustal thickness is largest (about 60 km) in the Tarim-Tien Shan junction zone. The crust-mantle boundary in this region descends by a jump as a result of an increase in the lower crust thickness. This is probably due to the underthrusting of the Tien Shan by the Tarim lithosphere. This causes the mechanically weak lower crust of the Tarim to delaminate and accumulate in nearly the same way as an accretionary prism during the subduction of oceanic lithosphere. In the upper mantle, the analysis has revealed a low velocity anomaly, apparently related to basaltic outflows of the Upper Cretaceous-Early Paleogene. The Cenozoic Bachu uplift in the northern Tarim depression is also associated with the low velocity anomaly. The Naryn depression is characterized by a high velocity in the upper mantle and can be interpreted as a fragment of an ancient platform.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia

    L. P. Vinnik, I. M. Aleshin, M. K. Kaban, S. G. Kiselev, G. L. Kosarev & S. I. Oreshin

  2. GeoForchungsZentrum Potsdam, Potsdam, Germany

    Ch. Reigber

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  1. L. P. Vinnik
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  2. I. M. Aleshin
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  4. S. G. Kiselev
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  5. G. L. Kosarev
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Original Russian Text © L.P. Vinnik, I.M. Aleshin, M.K. Kaban, S.G. Kiselev, G.L. Kosarev, S.I. Oreshin, Ch. Reigber, 2006, published in Fizika Zemli, 2006, No. 8, pp. 14–26.

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Vinnik, L.P., Aleshin, I.M., Kaban, M.K. et al. Crust and mantle of the Tien Shan from data of the receiver function tomography. Izv., Phys. Solid Earth 42, 639–651 (2006). https://doi.org/10.1134/S1069351306080027

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