Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions
Abstract
Synchrotron–based high–pressure and temperature single–crystal X–ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg1.004Si0.996O3, ~619 ppm water; oEn#2: Mg0.947Ni0.055Si0.998O3, ~696 ppm water) to ~34 GPa and 700 K, using resistively heated diamond anvil cells. The α–opx (Pbca space group)→β–opx (P21/c space group) phase transition of oEn#1 occurs at 12.90(2) GPa, and the β–opx phase persists to 34.25(1) GPa. The α–β transition of oEn#2 occurs at 13.50(1) GPa, and a new isosymmetric β–opx→β–opxII transition takes place at 29.80(4) GPa. The β–opxII phase is preserved down to 24.53(3) GPa during decompression. The transition to the monoclinic β–opxII phase is interpreted as a result of incorporation of Ni2+ into the orthoenstatite structure. Fitting the third–order Birch–Murnaghan thermal equation of state to the single–crystal P–V–T data yields the thermoelastic parameters of the α– and β–opx phases for both orthoenstatite samples. This study is the first attempt to determine the thermal equation of state of the β–opx phase. Our results suggest that several hundred ppm of water has negligible effects on the bulk modulus of orthoenstatite but notably enhances the thermal expansion. The potential effects of metastable orthoenstatite on subduction zone dynamics are discussed, and the possible contributions of displacive phase transitionsmore »
- Authors:
-
[2];
[4];
[2];
[2];
- Chinese Academy of Sciences, Gulyang (China); Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Chinese Academy of Science, Beijing (China)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Chinese Academy of Sciences, Gulyang (China)
- Univ. of New Mexico, Albuquerque, NM (United States)
- China Univ. of Geoscience, Wuhan (China)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)
- OSTI Identifier:
- 1459953
- Grant/Contract Number:
- AC02-06CH11357; 41772043; U1632112; EAR1440005; EAR11-57758; FG02-94ER14466; EAR1344942; EAR172296
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 4; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES
Citation Formats
Xu, Jingui, Zhang, Dongzhou, Fan, Dawei, Zhang, Jin S., Hu, Yi, Guo, Xinzhuan, Dera, Przemyslaw, and Zhou, Wenge. Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions. United States: N. p., 2018.
Web. doi:10.1002/2017JB015169.
Xu, Jingui, Zhang, Dongzhou, Fan, Dawei, Zhang, Jin S., Hu, Yi, Guo, Xinzhuan, Dera, Przemyslaw, & Zhou, Wenge. Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions. United States. https://doi.org/10.1002/2017JB015169
Xu, Jingui, Zhang, Dongzhou, Fan, Dawei, Zhang, Jin S., Hu, Yi, Guo, Xinzhuan, Dera, Przemyslaw, and Zhou, Wenge. Fri .
"Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions". United States. https://doi.org/10.1002/2017JB015169. https://www.osti.gov/servlets/purl/1459953.
@article{osti_1459953,
title = {Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions},
author = {Xu, Jingui and Zhang, Dongzhou and Fan, Dawei and Zhang, Jin S. and Hu, Yi and Guo, Xinzhuan and Dera, Przemyslaw and Zhou, Wenge},
abstractNote = {Synchrotron–based high–pressure and temperature single–crystal X–ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg1.004Si0.996O3, ~619 ppm water; oEn#2: Mg0.947Ni0.055Si0.998O3, ~696 ppm water) to ~34 GPa and 700 K, using resistively heated diamond anvil cells. The α–opx (Pbca space group)→β–opx (P21/c space group) phase transition of oEn#1 occurs at 12.90(2) GPa, and the β–opx phase persists to 34.25(1) GPa. The α–β transition of oEn#2 occurs at 13.50(1) GPa, and a new isosymmetric β–opx→β–opxII transition takes place at 29.80(4) GPa. The β–opxII phase is preserved down to 24.53(3) GPa during decompression. The transition to the monoclinic β–opxII phase is interpreted as a result of incorporation of Ni2+ into the orthoenstatite structure. Fitting the third–order Birch–Murnaghan thermal equation of state to the single–crystal P–V–T data yields the thermoelastic parameters of the α– and β–opx phases for both orthoenstatite samples. This study is the first attempt to determine the thermal equation of state of the β–opx phase. Our results suggest that several hundred ppm of water has negligible effects on the bulk modulus of orthoenstatite but notably enhances the thermal expansion. The potential effects of metastable orthoenstatite on subduction zone dynamics are discussed, and the possible contributions of displacive phase transitions to enhancement of the transformational faulting mechanism of the deep–focus earthquakes in subducted slabs are considered. In conclusion, the presence of metastable orthoenstatite within cold slabs could promote slab stagnation above the 660–km discontinuity.},
doi = {10.1002/2017JB015169},
journal = {Journal of Geophysical Research. Solid Earth},
number = 4,
volume = 123,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2018},
month = {Fri Mar 23 00:00:00 EDT 2018}
}
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- Nishi, Masayuki; Kubo, Tomoaki; Ohfuji, Hiroaki
- Earth and Planetary Science Letters, Vol. 361
Site-specific hydrogen diffusion rates in forsterite
text, January 2014
- O'Neill, Hugh St. C.; Hermann, Joerg; Padrón-Navarta, José Alberto
- Elsevier
Works referencing / citing this record:
Compressional Behavior of Hydrous Orthoenstatite: Insight into the Nature of LVZ under Continental Plate
journal, January 2020
- Hua, Florian Tian-Siang; Dera, Przemyslaw; Kung, Jennifer
- Minerals, Vol. 10, Issue 1
Hydrogen Effect on the Sound Velocities of Upper Mantle Omphacite
journal, November 2019
- Mans, Wade; Zhang, Jin S.; Hao, Ming
- Minerals, Vol. 9, Issue 11