High-pressure radiative conductivity of dense silicate glasses with potential implications for dark magmas

Motohiko Murakami (), Alexander F. Goncharov, Naohisa Hirao, Ryo Masuda, Takaya Mitsui, Sylvia-Monique Thomas and Craig R. Bina
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Motohiko Murakami: Graduate School of Science, Tohoku University
Alexander F. Goncharov: Geophysical Laboratory, Carnegie Institution of Washington
Naohisa Hirao: Japan Synchrotron Radiation Research Institute
Ryo Masuda: Japan Atomic Energy Agency
Takaya Mitsui: Japan Atomic Energy Agency
Sylvia-Monique Thomas: University of Nevada
Craig R. Bina: Northwestern University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract The possible presence of dense magmas at Earth’s core–mantle boundary is expected to substantially affect the dynamics and thermal evolution of Earth’s interior. However, the thermal transport properties of silicate melts under relevant high-pressure conditions are poorly understood. Here we report in situ high-pressure optical absorption and synchrotron Mössbauer spectroscopic measurements of iron-enriched dense silicate glasses, as laboratory analogues for dense magmas, up to pressures of 85 GPa. Our results reveal a significant increase in absorption coefficients, by almost one order of magnitude with increasing pressure to ~50 GPa, most likely owing to gradual changes in electronic structure. This suggests that the radiative thermal conductivity of dense silicate melts may decrease with pressure and so may be significantly smaller than previously expected under core–mantle boundary conditions. Such dark magmas heterogeneously distributed in the lower mantle would result in significant lateral heterogeneity of heat flux through the core–mantle boundary.

Date: 2014
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DOI: 10.1038/ncomms6428

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