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Title: Lattice dynamics, sound velocities, and atomic environments of szomolnokite at high pressure

Journal Article · · Physics and Chemistry of Minerals

Complex mixtures of sulfates, silicates, and ice have been observed in a variety of planetary environments on Earth, Mars and the icy satellites of the solar system. Characterizing the properties of the corresponding compositional endmembers is important for understanding the interiors of a range of planetary bodies in which these phases are observed. To measure the electronic and vibrational properties of the pure ferrous iron endmember of the kieserite group, szomolnokite, (FeSO4∙H2O), we have performed synchrotron 57Fe nuclear resonant inelastic and forward scattering experiments in the diamond-anvil cell up to 14.5 GPa. This pressure range covers depths within Earth’s interior relevant to sulfur cycling in subduction zones and the range of pressures expected within icy satellite interiors. We find evidence of crystal lattice softening, changes in elastic properties, and changes in the electric field gradients of iron atoms associated with two structural transitions occurring within the experimental pressure range. Here we apply these findings to icy satellite interiors, including discussion of elastic properties, modeling of ice-sulfate aggregates, and implications for tidal observations.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); W.M. Keck Foundation; National Science Foundation (NSF); USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC02-06CH11357; NA0003960; NSF-CSEDI-EAR-1600956; 2009935; EAR–1606856
OSTI ID:
2205497
Journal Information:
Physics and Chemistry of Minerals, Vol. 50, Issue 4; ISSN 0342-1791
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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