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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2018-41
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
25 May 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
Permian plume beneath Tarim from receiver functions
Lev Vinnik1, Yangfan Deng2, Grigoriy Kosarev1, Sergey Oreshin1, and Larissa Makeyeva1 1Institute of physics of the Earth, Russian Academy of Sciences, Moscow, Russia
2State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
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.
Citation: Vinnik, L., Deng, Y., Kosarev, G., Oreshin, S., and Makeyeva, L.: Permian plume beneath Tarim from receiver functions, Solid Earth Discuss., https://doi.org/10.5194/se-2018-41, in review, 2018.
Lev Vinnik et al.
Lev Vinnik et al.
Lev Vinnik et al.

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Short summary
We used the seismology data to estimate the thickness of MTZ and found the thinned MTZ beneath Tarim, which is exactly beneath the Permian basalts. This relation can be reconciled with coherently translation of a tectosphere, which extends to a depth of 410 km or more. Combined with the observations in Siberian Large Igneous Province and Greenland, these features confirm the existence of tectosphere that is different with the lithosphere-asthenosphere boundary.
We used the seismology data to estimate the thickness of MTZ and found the thinned MTZ beneath...
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