Acoustic and electrical properties of Fe-Ti oxides with application to the deep lunar mantle

Pommier, Anne; Walter, Michael J.; Hao, Ming; Yang, Jing; Hrubiak, Rostislav

doi:10.1016/j.epsl.2024.118570

Acoustic and electrical properties of Fe-Ti oxides with application to the deep lunar mantle

Journal Article · Wed Jan 31 23:00:00 EST 2024 · Earth and Planetary Science Letters

DOI:https://doi.org/10.1016/j.epsl.2024.118570· OSTI ID:2461614

^[1]; ^[1]; ^[1]; Yang, Jing ^[1]; ^[2]

Carnegie Institution for Science, Washington, DC (United States). Earth and Planets Laboratory (EPL)
Argonne National Laboratory (ANL), Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)

The overturn of titanium-rich mantle cumulates has been invoked to explain the structure and dynamics of the Moon. These dense cumulates are stable at the core-mantle boundary (CMB) and could explain field observations inferred from geophysical studies. Here, we report acoustic and electrical experiments on natural ilmenite-rutile aggregates up to 4.5 GPa and 1920 K. Seismic velocities show a weak pressure and temperature dependence, with Vs ~ 4.2 (+/-0.2) km/s and Vp ~8.0 (+/-0.2) km/s at the CMB conditions. Conductivity increases by a factor of 10⁴ from 373 to 1920 K and is >10(3) S/m above 1573 K. Seismic and electrical models for the lunar mantle based on our results, considering mixtures of Fe-Ti oxides and olivine, indicate that field velocity and conductivity estimates are reproduced satisfactorily with 3-16 vol.% Fe-Ti oxides and 20 vol.% melt. Interactions between a Ti-rich, melt-bearing layer and the adjacent core likely affect the cooling and magnetic history of the Moon.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2461614

Journal Information:: Earth and Planetary Science Letters, Journal Name: Earth and Planetary Science Letters Vol. 628; ISSN 0012-821X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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