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Volume 9, issue 5 | Copyright
Solid Earth, 9, 1179-1185, 2018
https://doi.org/10.5194/se-9-1179-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Oct 2018

Research article | 22 Oct 2018

Permian plume beneath Tarim from receiver functions

Lev Vinnik1, Yangfan Deng2, Grigoriy Kosarev1, Sergey Oreshin1, and Larissa Makeyeva1 Lev Vinnik et al.
  • 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 410km 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 1000km by assuming that the mantle layer, which has moved coherently with the plate since the Permian, extends to a depth of 410km or more. Alternatively, the lithosphere and underlying mantle are decoupled at a depth of  ∼ 200km, 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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We used seismology data to estimate the thickness of the MTZ and found it thinned beneath Tarim, which is exactly beneath the Permian basalts. This relation can be reconciled with coherent translation of a tectosphere that extends to a depth of 410 km or more. Combined with observations in the Siberian large igneous province and Greenland, these features may confirm the existence of a deep tectosphere. Alternatively, the shift of Tarim is less than predicted by an order of magnitude.
We used seismology data to estimate the thickness of the MTZ and found it thinned beneath Tarim,...
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