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Origin and evolution of the deep thermochemical structure beneath Eurasia

Author

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  • N. Flament

    (EarthByte Group, School of Geosciences, Madsen Building F09, University of Sydney
    Present address: School of Earth and Environmental Sciences, University of Wollongong, Northfields Avenue, Wollongong, New South Wales 2522, Australia)

  • S. Williams

    (EarthByte Group, School of Geosciences, Madsen Building F09, University of Sydney)

  • R. D. Müller

    (EarthByte Group, School of Geosciences, Madsen Building F09, University of Sydney)

  • M. Gurnis

    (Seismological Laboratory, California Institute of Technology)

  • D. J. Bower

    (Institute of Geophysics, ETH Zürich)

Abstract

A unique structure in the Earth’s lowermost mantle, the Perm Anomaly, was recently identified beneath Eurasia. It seismologically resembles the large low-shear velocity provinces (LLSVPs) under Africa and the Pacific, but is much smaller. This challenges the current understanding of the evolution of the plate–mantle system in which plumes rise from the edges of the two LLSVPs, spatially fixed in time. New models of mantle flow over the last 230 million years reproduce the present-day structure of the lower mantle, and show a Perm-like anomaly. The anomaly formed in isolation within a closed subduction network ∼22,000 km in circumference prior to 150 million years ago before migrating ∼1,500 km westward at an average rate of 1 cm year−1, indicating a greater mobility of deep mantle structures than previously recognized. We hypothesize that the mobile Perm Anomaly could be linked to the Emeishan volcanics, in contrast to the previously proposed Siberian Traps.

Suggested Citation

  • N. Flament & S. Williams & R. D. Müller & M. Gurnis & D. J. Bower, 2017. "Origin and evolution of the deep thermochemical structure beneath Eurasia," Nature Communications, Nature, vol. 8(1), pages 1-9, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14164
    DOI: 10.1038/ncomms14164
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    Cited by:

    1. Tinghong Zhou & John A. Tarduno & Francis Nimmo & Rory D. Cottrell & Richard K. Bono & Mauricio Ibanez-Mejia & Wentao Huang & Matt Hamilton & Kenneth Kodama & Aleksey V. Smirnov & Ben Crummins & Frank, 2022. "Early Cambrian renewal of the geodynamo and the origin of inner core structure," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Shiwen Li & Yabin Li & Yanhui Zhang & Zikun Zhou & Junhao Guo & Aihua Weng, 2023. "Remnant of the late Permian superplume that generated the Siberian Traps inferred from geomagnetic data," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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