Elastic properties of Mg-phase D at high pressure

Xu, Chaowen; Li, Ying; Inoue, Toru; Gréaux, Steeve; Li, Qingze; Gao, Jing; Sun, Fengxia; Fang, Leiming

doi:10.1080/08957959.2021.1954177

Cited by 4 publications

(3 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have proposed that the existence of low‐velocity regions at bottom of the MTZ may be related to the presence of hydrous minerals in the subducted slab (Liu et al., 2016; Rosa et al., 2015; Yang et al., 2017; Xu et al., 2020, 2021). It was however showed that phase D, the other main hydrous phase at these depths, cannot alone explain simultaneously low V P and low V S anomalies such as those observed beneath Tonga (Xu et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Sound Velocities of Superhydrous Phase B up to 21 GPa and 900 K

Gréaux

Inoue

et al. 2022

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Sound velocities and density of Mg10Si3H4O18 superhydrous phase B (SuB) were investigated by synchrotron X‐rays combined with ultrasonic interferometry techniques in a multi‐anvil apparatus, up to 21 GPa and 900 K. Our data show that SuB has compressional (VP) and shear velocities (VS) lower than major anhydrous minerals but higher than majorite garnet. Our data combined with those of other mantle minerals allowed estimation of VP and VS of hydrated mantle regions at depths of the mantle transition zone and upper lower mantle. The local hydration of pyrolitic mantle with SuB as the main water host could explain low VP and low VS anomalies near cold subduction zones while it would be associated with low VP and high VS anomalies in hot mantle regions. The anomalies may be particularly strong in the ∼30 km beneath the 660 km discontinuity, due to the discrepancy of post‐spinel transition between hydrous and dry pyrolite lithologies.

show abstract

Section: Discussionmentioning

confidence: 99%

Sound Velocities of Superhydrous Phase B up to 21 GPa and 900 K

Gréaux

Inoue

et al. 2022

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…High pressure ultrasonic measurement experiments were conducted in a newly designed hinge-type cubic large volume press (6 × 14 MN) with second-stage, which was installed at the high-pressure laboratory of China Mianyang Research Reactor (CMRR) neutron scattering facility, China Academy of Engineering Physics. [22][23][24][25][26] The schematic experimental setup for the newly designed hinge-type cubic LVP, and the highpressure ultrasonic measurement system is shown in Fig. 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The quasi-hydrostatic environment of the cell has been verified in previous h-AlN compression experiments. [23] A gold foil with 2 µm thickness is inserted between the buffer rod and the sample to enhance their mechanical coupling. In terms of high temperature experiments, a rhenium foil with 50 µm thickness is used as a furnace/heater to generate high temperatures.…”

Section: Experimental Methodsmentioning

confidence: 99%

In-situ ultrasonic calibrations of pressure and temperature in a hinge-type double-stage cubic large volume press

Chen

Xie

et al. 2022

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

Here, simultaneous in-situ calibration of pressures and temperatures was performed in a hinge-type second-stage cubic large volume press (LVP) up to 15 GPa and 1400 K by an acoustic travel-time approach. Based on the recently reported P-t S and P-T-t P -t S equations for Al2O3 buffer rod, the cell pressures and temperatures in the chamber of LVP were in-situ determined, in comparison with those by conventional off-line (or fixed-points) pressure calibration method and direct thermocouple measurement, respectively. It is found that the cell pressures of the LVP chamber are significantly reduced after annealing at simultaneous high pressures and high temperatures, owing to the stress relaxation as accumulate in the LVP chamber. This acoustic travel-time method is validated to be a good way for precise determination of thermal (cell) pressures at high temperature conditions, and is of great importance and necessity to conduct in-situ physical property measurements under extreme high P-T conditions, especially when the precious synchrotron X-ray/neutron diffraction beams are not available.

show abstract

Crystallographic Preferred Orientation of Phase D at High Pressure and Temperature: Implications for Seismic Anisotropy in the Mid‐Mantle

Wu,

Nishihara,

Tsujino

2024

JGR Solid Earth

View full text Add to dashboard Cite

Seismic anisotropy has been widely observed in the lower mantle transition zone and the uppermost lower mantle near several subducting slabs, which is typically attributed to the crystallographic preferred orientation (CPO) of constituent minerals. In this study, well‐controlled uniaxial and simple shear deformation experiments were conducted on Mg‐endmember phase D and Al‐bearing phase D aggregates at 20 GPa and 500–1,000°C. Strong (0001) fabrics were observed in the uniaxially compressed samples. The CPO from all experiments, including extension and simple shear, indicated that the most active slip systems in phase D were <110>(0001) and <100>(0001), with a dominance of <110>(0001). The calculated seismic velocity suggests that the deformed phase D generates positive radial seismic anisotropy (VSH > VSV) in both subhorizontal shearing and subvertical compression, causing significant shear‐wave splitting time. Our results suggest that the observed seismic anisotropy in the mid‐mantle in several cold subduction zones can be well explained by the presence of deformed phase D.

show abstract

Elastic properties of Mg-phase D at high pressure

Cited by 4 publications

References 44 publications

Sound Velocities of Superhydrous Phase B up to 21 GPa and 900 K

Sound Velocities of Superhydrous Phase B up to 21 GPa and 900 K

In-situ ultrasonic calibrations of pressure and temperature in a hinge-type double-stage cubic large volume press

Crystallographic Preferred Orientation of Phase D at High Pressure and Temperature: Implications for Seismic Anisotropy in the Mid‐Mantle

Contact Info

Product

Resources

About