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Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions
Jingui Xu;  Dongzhou Zhang;  Dawei Fan;  Jin S. Zhang;  Yi Hu;  Xinzhuan Guo;  Przemyslaw Dera;  Wenge Zhou
2018
发表期刊Journal of Geophysical Research Solid Earth
卷号123期号:4页码:2723-2737
摘要

Synchrotron-based high-pressure and temperature single-crystal X-ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg1.004Si0.996O3, 619ppm water; oEn#2: Mg0.947Ni0.055Si0.998O3, 696ppm water) to 34GPa and 700K, using resistively heated diamond anvil cells. The -opx (Pbca space group)-opx (P2(1)/c space group) phase transition of oEn#1 occurs at 12.90(2)GPa, and the -opx phase persists to 34.25(1)GPa. The - transition of oEn#2 occurs at 13.50(1)GPa, and a new isosymmetric -opx-opxII transition takes place at 29.80(4)GPa. The -opxII phase is preserved down to 24.53(3)GPa during decompression. The transition to the monoclinic -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 - and -opx phases for both orthoenstatite samples. This study is the first attempt to determine the thermal equation of state of the -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. The presence of metastable orthoenstatite within cold slabs could promote slab stagnation above the 660-km discontinuity.

收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8771
专题地球内部物质高温高压实验室
作者单位1.Key Laboratory of High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI, USA
3.University of Chinese Academy of Sciences, Beijing, China
4.Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA
5.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geoscience, Wuhan, China
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GB/T 7714
Jingui Xu;Dongzhou Zhang;Dawei Fan;Jin S. Zhang;Yi Hu;Xinzhuan Guo;Przemyslaw Dera;Wenge Zhou. Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions[J]. Journal of Geophysical Research Solid Earth,2018,123(4):2723-2737.
APA Jingui Xu;Dongzhou Zhang;Dawei Fan;Jin S. Zhang;Yi Hu;Xinzhuan Guo;Przemyslaw Dera;Wenge Zhou.(2018).Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions.Journal of Geophysical Research Solid Earth,123(4),2723-2737.
MLA Jingui Xu;Dongzhou Zhang;Dawei Fan;Jin S. Zhang;Yi Hu;Xinzhuan Guo;Przemyslaw Dera;Wenge Zhou."Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions".Journal of Geophysical Research Solid Earth 123.4(2018):2723-2737.
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