TY - JOUR
T1 - Sound Velocities of Al-Bearing Phase D up to 22 GPa and 1300 K
AU - Xu, Chaowen
AU - Gréaux, Steeve
AU - Inoue, Toru
AU - Noda, Masamichi
AU - Sun, Wei
AU - Kuwahara, Hideharu
AU - Higo, Yuji
N1 - Funding Information:
The authors thank T. Tange for preparing the beamline BL04B1 at SPring-8 before our high-pressure in situ X-ray experiments. The synchrotron radiation experiments were performed at the BL04B1 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) including our preliminary cell performance experiments (Proposal No. 2014B1435, 2015B1509, 2016B1497, 2017B1549, and 2018B1708). Some beamtime is supported by the PU program of GRC. We acknowledge support from Open Foundation of the United Laboratory of High-Pressure Physics and Earthquake Science (2019HPPES07) and the Natural Science Foundation of China (41573121 and 91958216). C.X. was also supported by Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (DC2). This work was supported by JSPS KAKENHI Grant Numbers 18J12511 for C.X. and 26247073, 15H05828, and 18H03740 for T.I.
Funding Information:
The authors thank T. Tange for preparing the beamline BL04B1 at SPring‐8 before our high‐pressure in situ X‐ray experiments. The synchrotron radiation experiments were performed at the BL04B1 of SPring‐8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) including our preliminary cell performance experiments (Proposal No. 2014B1435, 2015B1509, 2016B1497, 2017B1549, and 2018B1708). Some beamtime is supported by the PU program of GRC. We acknowledge support from Open Foundation of the United Laboratory of High‐Pressure Physics and Earthquake Science (2019HPPES07) and the Natural Science Foundation of China (41573121 and 91958216). C.X. was also supported by Research Fellowships of the Japan Society for the Promotion of Science (JSPS) for Young Scientists (DC2). This work was supported by JSPS KAKENHI Grant Numbers 18J12511 for C.X. and 26247073, 15H05828, and 18H03740 for T.I.
Publisher Copyright:
© 2020. American Geophysical Union. All Rights Reserved.
PY - 2020/9/28
Y1 - 2020/9/28
N2 - Sound velocities of Al-bearing phase D were investigated up to 22 GPa and 1300 K using in situ synchrotron X-ray techniques combined with ultrasonic measurements in a multianvil apparatus. The isothermal bulk modulus of Al-bearing phase D was found to be ~16.7% lower than that of Mg-endmember, suggesting a strong effect of Al incorporation on the bulk modulus of phase D. Al-bearing phase D has higher P- (VP) and S- (VS) wave velocities compared to other mantle transition zone minerals, up to 4.3% for VP and up to 9.6% for VS compared with hydrous iron-bearing ringwoodite, which might engender reduction of velocity contrast between anhydrous mantle and hydrous slab components. The accumulation of hydrated slab components carrying Al-phase D in the uppermost lower mantle can explain some local negative shear velocity perturbations (ΔVS) up to −1.5%, although ΔVP (−0.5%) is expected to remain below the detection limit of seismological techniques.
AB - Sound velocities of Al-bearing phase D were investigated up to 22 GPa and 1300 K using in situ synchrotron X-ray techniques combined with ultrasonic measurements in a multianvil apparatus. The isothermal bulk modulus of Al-bearing phase D was found to be ~16.7% lower than that of Mg-endmember, suggesting a strong effect of Al incorporation on the bulk modulus of phase D. Al-bearing phase D has higher P- (VP) and S- (VS) wave velocities compared to other mantle transition zone minerals, up to 4.3% for VP and up to 9.6% for VS compared with hydrous iron-bearing ringwoodite, which might engender reduction of velocity contrast between anhydrous mantle and hydrous slab components. The accumulation of hydrated slab components carrying Al-phase D in the uppermost lower mantle can explain some local negative shear velocity perturbations (ΔVS) up to −1.5%, although ΔVP (−0.5%) is expected to remain below the detection limit of seismological techniques.
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U2 - 10.1029/2020GL088877
DO - 10.1029/2020GL088877
M3 - Article
AN - SCOPUS:85091488878
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 18
M1 - e2020GL088877
ER -