Title: Possible H2O storage in the crystal structure of CaSiO3 perovskite

Journal Article · · Physics of the Earth and Planetary Interiors
 [1];  [1];  [2];  [3];  [4];  [5];  [5];  [1]
  1. Arizona State Univ., Tempe, AZ (United States)
  2. Univ. of Chicago, IL (United States)
  3. Univ. of Chicago, IL (United States); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

The lower mantle is believed to contain much less hydrogen (or H2O) because of the low storage capacity of the dominant mineral phases, such as bridgmanite and ferropericlase. However, possible hydrogen storage in the third most abundant mineral in the region, CaSiO3 perovskite (Ca-Pv), is not well unknown. Here, we have synthesized Ca-Pv from different starting materials with varying H2O contents at 19–120 GPa and 1400–2200 K in laser-heated diamond-anvil cell. While cubic perovskite structure is stable at the mantle-related pressures-temperatures (P-T) in anhydrous systems, we found non-cubic diffraction peak splitting in Ca-Pv even at high temperatures when it is synthesized from hydrous starting materials. In-situ high-pressure infrared spectroscopy showed OH vibration possibly from Ca-Pv. The unit-cell volume of hydrothermally synthesized Ca-Pv is systematically smaller than that of anhydrous Ca-Pv at high pressures. These observations suggest possible H2O storage in Ca-Pv at mantle-related P-T conditions. We also found the formation of separate δ–AlOOH and Ca-Pv phases from Al-bearing CaSiO3 glass starting materials in an H2O medium at 60 GPa and 1400 K. Ca-Pv still showed non-cubic peak splitting at high temperatures in this experiment. Therefore, it is possible that hydrous phases may coexist together with hydrous Ca-Pv in the lower mantle.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; FG02-94ER14466; FG02-99ER45775; NA0001974
OSTI ID:
1756050
Journal Information:
Physics of the Earth and Planetary Interiors, Journal Name: Physics of the Earth and Planetary Interiors Vol. 299; ISSN 0031-9201
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (59)

Dry (Mg,Fe)SiO 3 perovskite in the Earth's lower mantle journal February 2015
Intercomparison of the gold, platinum, and MgO pressure scales up to 140 GPa and 2500 K: EQUATIONS OF STATE OF AU, PT, AND MGO journal May 2017
Phase transition and equation of state of dense hydrous silica up to 63 GPa: DENSE HYDROUS PURE SILICA journal September 2017
Crystal structure refinement of suolunite and its significance to the cement techniques journal December 1999
Space group and hydrogen sites of ?-AlOOH and implications for a hypothetical high-pressure form of Mg(OH)2 journal July 2004
Ab initio study of the high-pressure behavior of CaSiO3 perovskite journal May 2005
Oxygen deficient perovskites in the system CaSiO3–CaAlO2.5 and implications for the Earth’s interior journal May 2007
A new hydrous phase δ-AlOOH synthesized at 21 GPa and 1000 °C journal December 2000
Hydrothermal formation of the calcium silicate hydrates, tobermorite (Ca5Si6O16(OH)2·4H2O) and xonotlite (Ca6Si6O17(OH)2): an in situ synchrotron study journal June 2000
Water partitioning between nominally anhydrous minerals in the MgO–SiO2–H2O system up to 24 GPa: implications for the distribution of water in the Earth's mantle journal November 2000
Water solubility in Mg-perovskites and water storage capacity in the lower mantle journal June 2003
The equation of state of CaSiO3 perovskite to 108 GPa at 300 K journal August 2000
Hydrous minerals and the storage of water in the deep mantle journal December 2015
Phase transition and density of subducted MORB crust in the lower mantle journal August 2005
High hydrogen solubility in Al-rich stishovite and water transport in the lower mantle journal October 2007
Symmetrization driven spin transition in ε-FeOOH at high pressure journal October 2013
Stability of a hydrous δ-phase, AlOOH–MgSiO2(OH)2, and a mechanism for water transport into the base of lower mantle journal September 2014
Water-bearing, high-pressure Ca-silicates journal July 2017
Phase stability and thermal equation of state of δ-AlOOH: Implication for water transportation to the Deep Lower Mantle journal July 2018
Phase transition in Al-bearing CaSiO3 perovskite: implications for seismic discontinuities in the lower mantle journal July 2004
Phase transformations of Ca3Al2Si3O12 grossular garnet to the depths of the Earth's mantle transition zone journal April 2011
Vitreous forsterite (Mg 2 SiO 4 ): Synthesis, structure, and thermochemistry journal July 2001
The stability and P-V-T equation of state of CaSiO 3 perovskite in the Earth's lower mantle journal November 2000
Pressure dependence of H solubility in magnesiowüstite up to 25 GPa: Implications for the storage of water in the Earth's lower mantle: PRESSURE DEPENDENCE OF H SOLUBILITY IN MAGNESIOWÜSTITE journal May 2002
Tetragonal structure of CaSiO 3 perovskite above 20 GPa: STRUCTURE OF CaSiO 3 PEROVSKITE journal December 2002
Water partitioning at 660 km depth and evidence for very low water solubility in magnesium silicate perovskite: WATER PARTITIONING journal September 2003
CaSiO 3 perovskite at lower mantle pressures journal January 2005
Olivine hydration in the deep upper mantle: Effects of temperature and silica activity journal January 2006
Aluminous hydrous mineral δ -AlOOH as a carrier of hydrogen into the core-mantle boundary journal January 2008
Hydrous modified spinel, Mg 1.75 SiH 0.5 O 4 : A new water reservoir in the mantle transition region journal January 1995
Thermal equation of state of CaSiO 3 perovskite journal January 1996
Stability of phase D at high pressure and high temperature journal April 1998
Mineralogy and dynamics of a pyrolite lower mantle journal May 1998
The pyrite-type high-pressure form of FeOOH journal July 2017
Hydrogen-bearing iron peroxide and the origin of ultralow-velocity zones journal November 2017
Stability of hydrous silicate at high pressures and water transport to the deep lower mantle journal February 2014
High pressure-temperature Raman measurements of H[sub 2]O melting to 22 GPa and 900 K journal January 2004
Pressure calibration of diamond anvil Raman gauge to 310GPa journal August 2006
Specific volume measurements of Cu, Mo, Pd, and Ag and calibration of the ruby R 1 fluorescence pressure gauge from 0.06 to 1 Mbar journal June 1978
Melting of ice under pressure journal September 2008
Ultrahydrous stishovite from high-pressure hydrothermal treatment of SiO2 journal December 2011
Advanced flat top laser heating system for high pressure research at GSECARS: application to the melting behavior of germanium journal September 2008
The COMPRES/GSECARS gas-loading system for diamond anvil cells at the Advanced Photon Source journal September 2008
DIOPTAS : a program for reduction of two-dimensional X-ray diffraction data and data exploration journal May 2015
Double-sided laser heating system at HPCAT for in situ x-ray diffraction at high pressures and high temperatures journal June 2006
Equation of state of ice VII up to 106 GPa journal September 1997
Octahedral Tilting in Perovskites. I. Geometrical Considerations journal February 1997
Water in Earth's Lower Mantle journal March 2002
Hydrogen in Stishovite, with Implications for Mantle Water Content journal August 1993
Compression of Ice to 210 Gigapascals: Infrared Evidence for a Symmetric Hydrogen-Bonded Phase journal July 1996
MANTLE GEOCHEMISTRY:Enhanced: A Lesson from Ceramics journal June 1999
Water in the Earth's mantle journal June 2005
Formation of hydrous stishovite from coesite in high-pressure hydrothermal environments journal November 2016
Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa journal November 2017
Crystal structure of CaSiO3 perovskite at 28–62 GPa and 300 K under quasi-hydrostatic stress conditions journal March 2018
Pressure and temperature-dependence of water solubility in Fe-free wadsleyite journal July 2005
Crystal structure of hydrous wadsleyite with 2.8% H2O and compressibility to 60 GPa journal November 2010
High pressure synthesis of a new aluminium silicate: Al5Si5O17(OH). journal January 1978
The Star–Planet Connection. I. Using Stellar Composition to Observationally Constrain Planetary Mineralogy for the 10 Closest Stars journal January 2018