Pressure-induced velocity softening in natural orthopyroxene at mantle temperature [electronic resource]
In this study, we have measured the compressional and shear wave velocities of (Mg<sub>1.77</sub>Fe<sub>0.22</sub>Ca<sub>0.01</sub>)Si<sub>2</sub>O<sub>6</sub> natural orthopyroxene up to 13.5 GPa and 873 K using ultrasonic interferometry i...
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| Format: | Electronic eBook |
| Language: | English |
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Washington, D.C. : Oak Ridge, Tenn. :
United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2019.
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| Subjects: |
MARC
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| 245 | 0 | 0 | |a Pressure-induced velocity softening in natural orthopyroxene at mantle temperature |h [electronic resource] |
| 260 | |a Washington, D.C. : |b United States. National Nuclear Security Administration ; |a Oak Ridge, Tenn. : |b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy, |c 2019. | ||
| 300 | |a Size: p. 1173-1179 : |b digital, PDF file. | ||
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| 500 | |a Published through Scitech Connect. | ||
| 500 | |a 08/01/2019. | ||
| 500 | |a "Journal ID: ISSN 0003-004X." | ||
| 500 | |a Wang, Siheng ; Chen, Ting ; Cai, Nao ; Qi, Xintong ; Fiege, Adrian ; Liebermann, Robert C. ; Li, Baosheng | ||
| 500 | |a Stony Brook Univ., NY (United States) | ||
| 520 | 3 | |a In this study, we have measured the compressional and shear wave velocities of (Mg<sub>1.77</sub>Fe<sub>0.22</sub>Ca<sub>0.01</sub>)Si<sub>2</sub>O<sub>6</sub> natural orthopyroxene up to 13.5 GPa and 873 K using ultrasonic interferometry in conjunction with in situ synchrotron X-ray diffraction and imaging techniques. Previous acoustic experiments on orthoenstatite (OEn) MgSiO<sub>3</sub> indicated that both compressional and shear velocities (V<sub>P</sub> and V<sub>S</sub>) of OEn undergo continuous velocity softening above 9 GPa at room temperature, which has been attributed to the phase transition from OEn to the metastable, high-pressure clinoenstatite HPCEn2. For the first time, our results suggest that pressure-induced velocity softening can occur in natural orthopyroxene at high-temperature conditions relevant to the Earth's cold subduction zones. As a result, estimates of the impedance and velocity contrasts between orthopyroxene (Opx) and high-pressure clinopyroxene (HPCpx) have been calculated, and the possibility of this phase transformation being a plausible candidate for seismic X-discontinuities at depth around 250?350 km is re-evaluated. | |
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| 650 | 7 | |a 36 materials science |2 local. | |
| 650 | 7 | |a 58 geosciences |2 local. | |
| 650 | 7 | |a 75 condensed matter physics, superconductivity and superfluidity |2 local. | |
| 650 | 7 | |a High pressure and high temperature |2 local. | |
| 650 | 7 | |a Elasticity |2 local. | |
| 650 | 7 | |a Velocity softening |2 local. | |
| 650 | 7 | |a Orthopyroxene |2 local. | |
| 650 | 7 | |a Ultrasonic interferometry |2 local. | |
| 710 | 2 | |a United States. National Nuclear Security Administration. |4 spn. | |
| 710 | 1 | |a United States. |b Department of Energy. |b Office of Scientific and Technical Information |4 dst. | |
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