start-ver=1.4
cd-journal=joma
no-vol=52
cd-vols=
no-issue=14
article-no=
start-page=e2024GL114146
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250718
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Small-scale scatterers observed in the mid-lower mantle beneath the subduction zones are thought to result from the phase transition of stishovite within subducted oceanic crusts. Here we investigate the phase transition of (Al, H)-bearing stishovite with four compositions at simultaneously high P-T conditions combining Raman spectroscopy and X-ray diffraction. These experimental results reveal that the incorporation of 0.01 a.p.f.u Al into stishovite with H/Al ratio of ∼1/3 lowers the transition pressure by 6.7(3) GPa. However, the Clapeyron slope of this transition is nearly unaffected by changes in the Al content and has a value of 12.2–12.5(3) MPa/K. According to our results, Al content variation ranging from 0 to 0.07 a.p.f.u in SiO2 can reasonably explain the depth distribution from 800 to 1,900 km of the seismic scatterers observed in the circum-Pacific region. These results deepen our understanding on the complex features of mid-lower mantle seismic scatterers and corresponding dynamic processes.
en-copyright=
kn-copyright=

en-aut-name=YuYingxin
en-aut-sei=Yu
en-aut-mei=Yingxin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ZhangYouyue
en-aut-sei=Zhang
en-aut-mei=Youyue
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=LiLuo
en-aut-sei=Li
en-aut-mei=Luo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=ZhangXinyue
en-aut-sei=Zhang
en-aut-mei=Xinyue
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=WangDenglei
en-aut-sei=Wang
en-aut-mei=Denglei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=MaoZhu
en-aut-sei=Mao
en-aut-mei=Zhu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=SunNingyu
en-aut-sei=Sun
en-aut-mei=Ningyu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=ZhangYanyao
en-aut-sei=Zhang
en-aut-mei=Yanyao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=LiXinyang
en-aut-sei=Li
en-aut-mei=Xinyang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=LiWancai
en-aut-sei=Li
en-aut-mei=Wancai
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=SpezialeSergio
en-aut-sei=Speziale
en-aut-mei=Sergio
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

en-aut-name=ZhangDongzhou
en-aut-sei=Zhang
en-aut-mei=Dongzhou
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=

en-aut-name=LinJung‐Fu
en-aut-sei=Lin
en-aut-mei=Jung‐Fu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=13
ORCID=

en-aut-name=YoshinoTakashi
en-aut-sei=Yoshino
en-aut-mei=Takashi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=14
ORCID=

affil-num=1
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=2
en-affil=Institute for Planetary Materials, Okayama University
kn-affil=

affil-num=3
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=4
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=5
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=6
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=7
en-affil=Deep Space Exploration Laboratory, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=8
en-affil=Earth and Planetary Sciences, Stanford University
kn-affil=

affil-num=9
en-affil=State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University
kn-affil=

affil-num=10
en-affil=CAS Key Laboratory of Crust‐Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China
kn-affil=

affil-num=11
en-affil=GFZ German Research Centre for Geosciences
kn-affil=

affil-num=12
en-affil=GeoSoilEnviroCARS, University of Chicago
kn-affil=

affil-num=13
en-affil=Department of Earth and Planetary Sciences, Jackson School of Geosciences, The University of Texas at Austin
kn-affil=

affil-num=14
en-affil=Institute for Planetary Materials, Okayama University
kn-affil=
en-keyword=(Al, H)-bearing stishovite
kn-keyword=(Al, H)-bearing stishovite
en-keyword=phase transition
kn-keyword=phase transition
en-keyword=mid-lower mantle
kn-keyword=mid-lower mantle
en-keyword=small-scale seismic scatterers
kn-keyword=small-scale seismic scatterers
END