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Discussion papers | Copyright
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

Research article | 25 May 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Solid Earth (SE) and is expected to appear here in due course.

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 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 410km or more. Alternatively, lithosphere and the underlying mantle are decoupled at a depth of ~200km, 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.

Lev Vinnik et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
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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