HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth

Yuan, Hongsheng; Man, Lianjie; Kim, Duck Young; Popov, Dmitry; Meng, Yue; Greenberg, Eran; Prakapenka, Vitali; Zhang, Li

doi:10.2138/am-2022-8283

Title: HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth

Journal Article · 31 January 2022 · American Mineralogist

DOI: https://doi.org/10.2138/am-2022-8283 · OSTI ID:1909017

^[1]; Man, Lianjie ^[1]; Kim, Duck Young ^[1]; Popov, Dmitry ^[2]; Meng, Yue ^[2]; Greenberg, Eran ^[3]; Prakapenka, Vitali ^[3];

^[1]

Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Argonne National Laboratory (ANL), Argonne, IL (United States)
University of Chicago, IL (United States)

Here, we report for the first time the formation of a HP-PdF₂-type FeCl₂ phase (space group Pa$$\bar{3}$$), through high pressure-temperature (P-T) reactions in the hydrous systems (Mg_0.6Fe_0.4)SiO₃–H₂O–NaCl and FeO2H–NaCl in a laser-heated diamond-anvil cell up to 108 GPa and 2000 K. Applying single-crystal X-ray diffraction (XRD) analysis to individual submicrometer-sized grains, we have successfully determined the crystal structure of the as-synthesized FeCl₂ phase, in agreement with our theoretical structure search results. In situ high P-T XRD data revealed the substitution of Cl for OH(O) in such a cubic Pa$$\bar{3}$$ structure, demonstrating that this topology is a potential host for both H and Cl in the deep Earth. The chemical analysis of the recovered sample showed that the post-perovskite phase contains considerable amounts of Na₂O and Fe₂O₃. The coexistence of the cubic FeCl₂ phase and post-perovskite suggests that the lowermost mantle could be a potential reservoir of Cl. The possible presence of volatiles such as H and Cl in the deep lower mantle would impact the composition and iron valence state of the post-perovskite phase.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA) National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1909017

Journal Information:: American Mineralogist, Journal Name: American Mineralogist Journal Issue: 2 Vol. 107; ISSN 0003-004X

Publisher:: Mineralogical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Title: HP-PdF2-type FeCl2 as a potential Cl-carrier in the deep Earth

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