Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Xu, Jingui; Zhang, Dongzhou; Fan, Dawei; Zhang, Jin S.; Hu, Yi; Guo, Xinzhuan; Dera, Przemyslaw; Zhou, Wenge

doi:10.1002/2017JB015169

Title: Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Journal Article · Fri Mar 23 00:00:00 EDT 2018 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2017JB015169· OSTI ID:1459953

Xu, Jingui ^[1];

^[2]; Fan, Dawei ^[3];

^[4];

^[2]; Guo, Xinzhuan ^[5];

^[2]; Zhou, Wenge ^[3]

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)

Synchrotron–based high–pressure and temperature single–crystal X–ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg_1.004Si_0.996O₃, ~619 ppm water; oEn#2: Mg_0.947Ni_0.055Si_0.998O₃, ~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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; 41772043; U1632112; EAR1440005; EAR11-57758; FG02-94ER14466; EAR1344942; EAR172296

OSTI ID:: 1459953

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 123, Issue 4; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 19 works

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Hydrogen Effect on the Sound Velocities of Upper Mantle Omphacite Mans, Wade; Zhang, Jin S.; Hao, Ming Minerals, Vol. 9, Issue 11 https://doi.org/10.3390/min9110690	journal	November 2019

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