Dehydration of δ-AlOOH in Earth’s Deep Lower Mantle

Piet, Hélène; Leinenweber, Kurt D.; Tappan, Jacqueline; Greenberg, Eran; Prakapenka, Vitali B.; Buseck, Peter R.; Shim, Sang-Heon

doi:10.3390/min10040384

Title: Dehydration of δ-AlOOH in Earth’s Deep Lower Mantle

Journal Article · Fri Apr 24 00:00:00 EDT 2020 · Minerals

DOI:https://doi.org/10.3390/min10040384· OSTI ID:1616603

^[1]; Leinenweber, Kurt D. ^[1]; Tappan, Jacqueline ^[1];

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Arizona State Univ., Tempe, AZ (United States)
Univ. of Chicago, IL (United States)

δ-AlOOH has been shown to be stable at the pressure–temperature conditions of the lower mantle. However, its stability remains uncertain at the conditions expected for the lowermost mantle where temperature is expected to rise quickly with increasing depth. Our laser-heated diamond-anvil cell experiments show that δ-AlOOH undergoes dehydration at ~2000 K above 90 GPa. This dehydration temperature is lower than geotherm temperatures expected at the bottom ~700 km of the mantle and suggests that δ-AlOOH in warm slabs would dehydrate in this region. Our experiments also show that the released H₂O from dehydration of δ-AlOOH can react with metallic iron, forming iron oxide, iron hydroxide, and possibly iron hydride. Our observations suggest that H₂O from the dehydration of subducting slabs, if it occurs, could alter the chemical composition of the surrounding mantle and core regions.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466; EAR-1634415; EAR-1338810; 80NSSC18K0353

OSTI ID:: 1616603

Journal Information:: Minerals, Vol. 10, Issue 4; ISSN 2075-163X

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 9 works

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58 GEOSCIENCES
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Title: Dehydration of δ-AlOOH in Earth’s Deep Lower Mantle

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