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Solid Solution and Compression Behavior of Hydroxides in the Lower Mantle
Author(s) -
Nishi M.,
Tsuchiya J.,
Kuwayama Y.,
Arimoto T.,
Tange Y.,
Higo Y.,
Hatakeyama T.,
Irifune T.
Publication year - 2019
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.983
H-Index - 232
eISSN - 2169-9356
pISSN - 2169-9313
DOI - 10.1029/2019jb018146
Subject(s) - solid solution , materials science , mineralogy , ternary operation , homogeneous , homogeneity (statistics) , mantle (geology) , thermodynamics , analytical chemistry (journal) , chemistry , metallurgy , geology , geochemistry , physics , statistics , mathematics , chromatography , computer science , programming language
The high‐pressure solid solution and compression behavior of hydroxides in the ternary MgSiO 4 H 2 ‐AlOOH‐FeOOH system were studied at pressures of 16–60 GPa and temperatures of 300–1513 K. We applied in situ X‐ray measurements in conjunction with a multianvil apparatus using sintered diamond anvils to achieve homogeneous temperature distributions within large sample volumes. Our results show that CaCl 2 ‐type hydroxides form solid solutions over a wide composition range. We also observed the volume reductions in the solid solutions accompanied by a spin transition of iron at ~50 GPa, and the wide compositional ranges are maintained through this process. Consequently, water may be transported into the deep lower mantle by the hydrous CaCl 2 ‐type solid solution with changing its composition depending on the chemical and thermal environments.