Phase transition of wadsleyite-ringwoodite in the Mg 2 SiO 4 -Fe 2 SiO 4 system

Noriyoshi Tsujino, Takashi Yoshino, Daisuke Yamazaki, Moe Sakurai, Wei Sun, Fang Xu, Yoshinori Tange, Yuji Higo

Research output: Contribution to journalArticle

Abstract

The Fe-bearing wadsleyite-ringwoodite phase transition loop under dry conditions in a temperature range of 1473 and 1873 K was determined by in situ X-ray diffraction experiments at the synchrotron facility SPring-8. Pressure at high temperature was precisely determined within a 0.23 GPa error using in situ X-ray diffraction of MgO as a pressure standard. Under dry conditions, assuming an equilibrium chemical composition of wadsleyite and ringwoodite coexisting with garnet in a pyrolite model and an adiabatic temperature gradient with a potential temperature of 1550-1650 K, the phase transition depth and effective width of the seismic discontinuity were found to be 500-514 and 20-22 km, respectively. This effective width, which is three times greater than that of the olivine-wadsleyite phase boundary, can reflect a seismic wave of approximately 0.25 Hz. The wider transition loop between wadsleyite and ringwoodite could create a broad seismic discontinuity. Considering wet and oxidized conditions, the depth of the wadsleyite-ringwoodite phase boundary could be greater than 520 km assuming the small temperature dependency on water and oxygen fugacity effects. Variation in the depth of seismic anomaly may be attributed to water content or oxygen fugacity of the transition zone.

Original languageEnglish
Pages (from-to)588-594
Number of pages7
JournalAmerican Mineralogist
Volume104
Issue number4
DOIs
Publication statusPublished - Apr 1 2019

Fingerprint

wadsleyite
ringwoodite
phase transition
Phase transitions
Phase boundaries
discontinuity
fugacity
Bearings (structural)
Oxygen
X ray diffraction
Temperature
Seismic waves
X-ray diffraction
pyrolite
Garnets
seismic waves
oxygen
Synchrotrons
diffraction
olivine

Keywords

  • in-situ experiments
  • Mantle
  • phase boundary loop
  • ringwoodite
  • wadsleyite

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Phase transition of wadsleyite-ringwoodite in the Mg 2 SiO 4 -Fe 2 SiO 4 system . / Tsujino, Noriyoshi; Yoshino, Takashi; Yamazaki, Daisuke; Sakurai, Moe; Sun, Wei; Xu, Fang; Tange, Yoshinori; Higo, Yuji.

In: American Mineralogist, Vol. 104, No. 4, 01.04.2019, p. 588-594.

Research output: Contribution to journalArticle

Tsujino, Noriyoshi ; Yoshino, Takashi ; Yamazaki, Daisuke ; Sakurai, Moe ; Sun, Wei ; Xu, Fang ; Tange, Yoshinori ; Higo, Yuji. / Phase transition of wadsleyite-ringwoodite in the Mg 2 SiO 4 -Fe 2 SiO 4 system In: American Mineralogist. 2019 ; Vol. 104, No. 4. pp. 588-594.
@article{a7035a8413b74b61bd81824aa1a43fb4,
title = "Phase transition of wadsleyite-ringwoodite in the Mg 2 SiO 4 -Fe 2 SiO 4 system",
abstract = "The Fe-bearing wadsleyite-ringwoodite phase transition loop under dry conditions in a temperature range of 1473 and 1873 K was determined by in situ X-ray diffraction experiments at the synchrotron facility SPring-8. Pressure at high temperature was precisely determined within a 0.23 GPa error using in situ X-ray diffraction of MgO as a pressure standard. Under dry conditions, assuming an equilibrium chemical composition of wadsleyite and ringwoodite coexisting with garnet in a pyrolite model and an adiabatic temperature gradient with a potential temperature of 1550-1650 K, the phase transition depth and effective width of the seismic discontinuity were found to be 500-514 and 20-22 km, respectively. This effective width, which is three times greater than that of the olivine-wadsleyite phase boundary, can reflect a seismic wave of approximately 0.25 Hz. The wider transition loop between wadsleyite and ringwoodite could create a broad seismic discontinuity. Considering wet and oxidized conditions, the depth of the wadsleyite-ringwoodite phase boundary could be greater than 520 km assuming the small temperature dependency on water and oxygen fugacity effects. Variation in the depth of seismic anomaly may be attributed to water content or oxygen fugacity of the transition zone.",
keywords = "in-situ experiments, Mantle, phase boundary loop, ringwoodite, wadsleyite",
author = "Noriyoshi Tsujino and Takashi Yoshino and Daisuke Yamazaki and Moe Sakurai and Wei Sun and Fang Xu and Yoshinori Tange and Yuji Higo",
year = "2019",
month = "4",
day = "1",
doi = "10.2138/am-2019-6823",
language = "English",
volume = "104",
pages = "588--594",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "Mineralogical Society of America",
number = "4",

}

TY - JOUR

T1 - Phase transition of wadsleyite-ringwoodite in the Mg 2 SiO 4 -Fe 2 SiO 4 system

AU - Tsujino, Noriyoshi

AU - Yoshino, Takashi

AU - Yamazaki, Daisuke

AU - Sakurai, Moe

AU - Sun, Wei

AU - Xu, Fang

AU - Tange, Yoshinori

AU - Higo, Yuji

PY - 2019/4/1

Y1 - 2019/4/1

N2 - The Fe-bearing wadsleyite-ringwoodite phase transition loop under dry conditions in a temperature range of 1473 and 1873 K was determined by in situ X-ray diffraction experiments at the synchrotron facility SPring-8. Pressure at high temperature was precisely determined within a 0.23 GPa error using in situ X-ray diffraction of MgO as a pressure standard. Under dry conditions, assuming an equilibrium chemical composition of wadsleyite and ringwoodite coexisting with garnet in a pyrolite model and an adiabatic temperature gradient with a potential temperature of 1550-1650 K, the phase transition depth and effective width of the seismic discontinuity were found to be 500-514 and 20-22 km, respectively. This effective width, which is three times greater than that of the olivine-wadsleyite phase boundary, can reflect a seismic wave of approximately 0.25 Hz. The wider transition loop between wadsleyite and ringwoodite could create a broad seismic discontinuity. Considering wet and oxidized conditions, the depth of the wadsleyite-ringwoodite phase boundary could be greater than 520 km assuming the small temperature dependency on water and oxygen fugacity effects. Variation in the depth of seismic anomaly may be attributed to water content or oxygen fugacity of the transition zone.

AB - The Fe-bearing wadsleyite-ringwoodite phase transition loop under dry conditions in a temperature range of 1473 and 1873 K was determined by in situ X-ray diffraction experiments at the synchrotron facility SPring-8. Pressure at high temperature was precisely determined within a 0.23 GPa error using in situ X-ray diffraction of MgO as a pressure standard. Under dry conditions, assuming an equilibrium chemical composition of wadsleyite and ringwoodite coexisting with garnet in a pyrolite model and an adiabatic temperature gradient with a potential temperature of 1550-1650 K, the phase transition depth and effective width of the seismic discontinuity were found to be 500-514 and 20-22 km, respectively. This effective width, which is three times greater than that of the olivine-wadsleyite phase boundary, can reflect a seismic wave of approximately 0.25 Hz. The wider transition loop between wadsleyite and ringwoodite could create a broad seismic discontinuity. Considering wet and oxidized conditions, the depth of the wadsleyite-ringwoodite phase boundary could be greater than 520 km assuming the small temperature dependency on water and oxygen fugacity effects. Variation in the depth of seismic anomaly may be attributed to water content or oxygen fugacity of the transition zone.

KW - in-situ experiments

KW - Mantle

KW - phase boundary loop

KW - ringwoodite

KW - wadsleyite

UR - http://www.scopus.com/inward/record.url?scp=85064162236&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85064162236&partnerID=8YFLogxK

U2 - 10.2138/am-2019-6823

DO - 10.2138/am-2019-6823

M3 - Article

AN - SCOPUS:85064162236

VL - 104

SP - 588

EP - 594

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 4

ER -