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Influence of an endothermic phase transition on mass transfer between the upper and the lower mantle

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Abstract

Geochemical data indicate that two major reservoirs 1–2 Ga in age are present in the mantle. The upper mantle, feeding mid-ocean ridges, is depleted in chemical elements carried away into the continental crust. The lower mantle, feeding hotspot plumes, is close in composition to primordial matter. The 660-km depth of an endothermic phase transition in olivine has been considered over the last two decades as a possible boundary between the reservoirs. In this period, many models of mantle convection were constructed that used values of the phase transition parameters, which led to temporal (up to 1 Gyr long) convection layerings and periodic avalanche-induced mantle intermixing events. However, laboratory measurements with new improved instrumentation give other values of the phase transition parameters that require a revision of the majority of the existence of large-scale avalanches in the Earth’s history becomes disputable. The paper is devoted to comprehensive study of the phase transition effect on the structure of mantle flows with different values of phase transition parameters and Rayleigh numbers; in particular, the mass transfer through the phase boundary is calculated for different regimes of steady-state convection.

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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

    V. P. Trubitsyn, A. N. Evseev, A. A. Baranov & A. P. Trubitsyn

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  1. V. P. Trubitsyn
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  2. A. N. Evseev
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  3. A. A. Baranov
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  4. A. P. Trubitsyn
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Correspondence to V. P. Trubitsyn.

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Original Russian Text © V.P. Trubitsyn, A.N. Evseev, A.A. Baranov, A.P. Trubitsyn, 2008, published in Fizika Zemli, 2008, No. 6, pp. 3–16.

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Trubitsyn, V.P., Evseev, A.N., Baranov, A.A. et al. Influence of an endothermic phase transition on mass transfer between the upper and the lower mantle. Izv., Phys. Solid Earth 44, 443–455 (2008). https://doi.org/10.1134/S1069351308060013

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  • DOI: https://doi.org/10.1134/S1069351308060013

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