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Title: Evidence for the stability of ultrahydrous stishovite in Earth’s lower mantle

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [3];  [1];  [2]
  1. Carnegie Inst. of Science, Washington, DC (United States)
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

The distribution and transportation of water in Earth’s interior depends on the stability of water-bearing phases. The transition zone in Earth’s mantle is generally accepted as an important potential water reservoir because its main constituents, wadsleyite and ringwoodite, can incorporate weight percent levels of H2O in their structures at mantle temperatures. The extent to which water can be transported beyond the transition zone deeper into the mantle depends on the water carrying capacity of minerals stable in subducted lithosphere. Stishovite is one of the major mineral components in subducting oceanic crust, yet the capacity of stishovite to incorporate water beyond at lower mantle conditions remains speculative. Here, we combine in situ laser heating with synchrotron X-ray diffraction to show that the unit cell volume of stishovite synthesized under hydrous conditions is ~2.3 to 5.0% greater than that of anhydrous stishovite at pressures of ~27 to 58 GPa and temperatures of 1,240 to 1,835 K. Our results indicate that stishovite, even at temperatures along a mantle geotherm, can potentially incorporate weight percent levels of H2O in its crystal structure and has the potential to be a key phase for transporting and storing water in the lower mantle.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
AC02-06CH11357; EAR-1157758; EAR-1722515; U1530402; U1930401
OSTI ID:
1755916
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 117, Issue 1; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (49)

Dehydration melting at the top of the lower mantle journal June 2014
Mineralogy of subducted basaltic crust (MORB) from 25 to 37 GPa, and chemical heterogeneity of the lower mantle journal July 2001
Lower-mantle water reservoir implied by the extreme stability of a hydrous aluminosilicate journal December 2014
Connectivity of aqueous fluid in eclogite and its implications for fluid migration in the Earth's interior: AQUEOUS FLUID CONNECTIVITY IN ECLOGITE journal June 2003
Raman spectroscopy of water-rich stishovite and dense high-pressure silica up to 55 GPa journal November 2017
High concentration of water in stishovite in the MORB system journal January 2002
Transport of water into the lower mantle: Role of stishovite: TRANSPORT OF WATER INTO THE LOWER MANTLE journal January 2003
Ultrafast visualization of crystallization and grain growth in shock-compressed SiO2 journal September 2015
Formation of hydrous stishovite from coesite in high-pressure hydrothermal environments journal November 2016
Toward an internally consistent pressure scale journal May 2007
Unit cell refinement from powder diffraction data: the use of regression diagnostics journal February 1997
Ultrahydrous stishovite from high-pressure hydrothermal treatment of SiO2 journal December 2011
Stability of hydrous silicate at high pressures and water transport to the deep lower mantle journal February 2014
In situ determination of crystal structure and chemistry of minerals at Earth's deep lower mantle conditions journal May 2017
The post-stishovite phase transition in hydrous alumina-bearing SiO2 in the lower mantle of the earth journal August 2007
Phase transition and equation of state of dense hydrous silica up to 63 GPa: DENSE HYDROUS PURE SILICA journal September 2017
The role of water in Earth's mantle journal June 2019
Water in Natural Mantle Minerals II: Olivine, Garnet and Accessory Minerals journal January 2006
Water in Natural Mantle Minerals I: Pyroxenes journal January 2006
Blue boron-bearing diamonds from Earth’s lower mantle journal August 2018
Hydrogen in Stishovite, with Implications for Mantle Water Content journal August 1993
Why do mafic arc magmas contain ∼4wt% water on average? journal February 2013
Double-sided laser heating system at HPCAT for in situ x-ray diffraction at high pressures and high temperatures journal June 2006
Effect of water on melting phase relations and melt composition in the system Mg2SiO4MgSiO3H2O up to 15 GPa journal September 1994
Water in the Earth's mantle journal June 2005
Evidence for an early wet Moon from experimental crystallization of the lunar magma ocean journal November 2016
Strength and Elasticity of S i O 2 across the Stishovite– C a C l 2 -type Structural Phase Boundary journal December 2002
CO2-induced destabilization of pyrite-structured FeO2Hx in the lower mantle journal March 2018
Equations of state and phase boundary for stishovite and CaCl2-type SiO2 journal May 2018
Rheology of synthetic olivine aggregates: Influence of grain size and water journal January 1986
Sound velocities of olivine at high pressures and temperatures and the composition of Earth's upper mantle: Sound Velocities of Olivine journal September 2016
Petrogenetic grid in the system MgO-SiO 2 -H 2 O up to 30 GPa, 1600°C: Applications to hydrous peridotite subducting into the Earth’s deep interior journal January 2004
A new, post-stishovite highpressure polymorph of silica journal July 1989
Early episodes of high-pressure core formation preserved in plume mantle journal January 2018
The H/C ratios of Earth's near-surface and deep reservoirs, and consequences for deep Earth volatile cycles journal May 2009
Equation of state of stishovite to lower mantle pressures journal February 2003
When water meets iron at Earth's core–mantle boundary journal September 2017
Phase transition and density of subducted MORB crust in the lower mantle journal August 2005
Water partitioning at 660 km depth and evidence for very low water solubility in magnesium silicate perovskite: WATER PARTITIONING journal September 2003
High hydrogen solubility in Al-rich stishovite and water transport in the lower mantle journal October 2007
Hydrous mantle transition zone indicated by ringwoodite included within diamond journal March 2014
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
The stability of hydrous silicates in Earth's lower mantle: Experimental constraints from the systems MgO–SiO2–H2O and MgO–Al2O3–SiO2–H2O journal December 2015
Subduction factory: 4. Depth-dependent flux of H 2 O from subducting slabs worldwide journal January 2011
Transformation of stishovite to a denser phase at lower-mantle pressures journal March 1995
Serpentine Stability to Mantle Depths and Subduction-Related Magmatism journal May 1995
Solubility of water in the α, β and γ phases of (Mg,Fe) 2 SiO 4 journal May 1996
Hydrous olivine unable to account for conductivity anomaly at the top of the asthenosphere journal October 2006
Stability of various hydrous phases in CMAS pyrolite-H 2 O system up to 25 GPa journal April 2003

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