Reduced lattice thermal conductivity of Fe-bearing bridgmanite in Earth's deep mantle

Hsieh, Wen -Pin; Deschamps, Frédéric; Okuchi, Takuo; Lin, Jung -Fu

doi:10.1002/2017JB014339

Title: Reduced lattice thermal conductivity of Fe-bearing bridgmanite in Earth's deep mantle

Journal Article · Mon Jun 19 00:00:00 EDT 2017 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2017JB014339· OSTI ID:1474280

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Academia Sinica, Taipei (Taiwan)
Okayama Univ., Misasa (Japan)
Univ. of Texas at Austin, Austin TX (United States)

Complex seismic, thermal, and chemical features have been reported in Earth's lowermost mantle. In particular, possible iron enrichments in the large low shear–wave velocity provinces (LLSVPs) could influence thermal transport properties of the constituting minerals in this region, altering the lower mantle dynamics and heat flux across core–mantle boundary (CMB). Thermal conductivity of bridgmanite is expected to partially control the thermal evolution and dynamics of Earth's lower mantle. Importantly, the pressure–induced lattice distortion and iron spin and valence states in bridgmanite could affect its lattice thermal conductivity, but these effects remain largely unknown. Here we precisely measured the lattice thermal conductivity of Fe–bearing bridgmanite to 120 GPa using optical pump–probe spectroscopy. The conductivity of Fe–bearing bridgmanite increases monotonically with pressure but drops significantly around 45 GPa due to pressure–induced lattice distortion on iron sites. Our findings indicate that lattice thermal conductivity at lowermost mantle conditions is twice smaller than previously thought. The decrease in the thermal conductivity of bridgmanite in mid–lower mantle and below would promote mantle flow against a potential viscosity barrier, facilitating slabs crossing over the 1000 km depth. Modeling of our results applied to LLSVPs shows that variations in iron and bridgmanite fractions induce a significant thermal conductivity decrease, which would enhance internal convective flow. Our CMB heat flux modeling indicates that while heat flux variations are dominated by thermal effects, variations in thermal conductivity also play a significant role. In conclusion, the CMB heat flux map we obtained is substantially different from those assumed so far, which may influence our understanding of the geodynamo.

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-94ER14466

OSTI ID:: 1474280

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 122, Issue 7; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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