Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica

Chen, Huawei; Leinenweber, Kurt; Prakapenka, Vitali; Kunz, Martin; Bechtel, Hans A.; Liu, Zhenxian; Shim, Sang-Heon

doi:10.2138/am-2020-7261

Title: Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica

Journal Article · Sun Sep 20 00:00:00 UTC 2020 · American Mineralogist

DOI: https://doi.org/10.2138/am-2020-7261 · OSTI ID:1780748

Chen, Huawei ^[1]; Leinenweber, Kurt ^[1]; Prakapenka, Vitali ^[2]; Kunz, Martin ^[3]; Bechtel, Hans A. ^[3]; Liu, Zhenxian ^[4];

^[1]

Arizona State Univ., Tempe, AZ (United States)
Univ. of Chicago, IL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Carnegie Inst. of Washington, Washington, DC (United States)

In order to understand the effects of H₂O on the mineral phases forming under the pressure-temperature conditions of the lower mantle, we have conducted laser-heated diamond-anvil cell experiments on hydrous ringwoodite (Mg₂SiO₄ with 1.1wt% H₂O) at pressures between 29 and 59 GPa and temperatures between 1200 and 2400 K. Our experimental results show that hydrous ringwoodite (hRw) converts to crystalline dense hydrous silica, stishovite (Stv) or CaCl₂-type SiO₂ (mStv), containing 1 wt% H₂O together with Brd and MgO at the pressure-temperature conditions expected for shallow lower-mantle depths between approximately 660 to 1600 km. Considering lack of sign for melting in our experiments, our preferred interpretation of the observation is that Brd partially breaks down to dense hydrous silica and periclase (Pc), forming Brd + Pc + Stv mineralogy. Our experiments may provide an explanation for the enigmatic coexistence of Stv and Fp inclusions in lower-mantle diamonds

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1780748

Journal Information:: American Mineralogist, Journal Name: American Mineralogist Journal Issue: 9 Vol. 105; ISSN 0003-004X

Publisher:: Mineralogical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Phase transformation of hydrous ringwoodite to the lower-mantle phases and the formation of dense hydrous silica

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