Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite
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...
Saved in:
| Main Authors: | , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-07-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2024GL114146 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850075315830784000 |
|---|---|
| author | Yingxin Yu Youyue Zhang Luo Li Xinyue Zhang Denglei Wang Zhu Mao Ningyu Sun Yanyao Zhang Xinyang Li Wancai Li Sergio Speziale Dongzhou Zhang Jung‐Fu Lin Takashi Yoshino |
| author_facet | Yingxin Yu Youyue Zhang Luo Li Xinyue Zhang Denglei Wang Zhu Mao Ningyu Sun Yanyao Zhang Xinyang Li Wancai Li Sergio Speziale Dongzhou Zhang Jung‐Fu Lin Takashi Yoshino |
| author_sort | Yingxin Yu |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-b069dead47cd4d0eb0a619c51edcc79f |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-b069dead47cd4d0eb0a619c51edcc79f2025-08-20T02:46:20ZengWileyGeophysical Research Letters0094-82761944-80072025-07-015214n/an/a10.1029/2024GL114146Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing StishoviteYingxin Yu0Youyue Zhang1Luo Li2Xinyue Zhang3Denglei Wang4Zhu Mao5Ningyu Sun6Yanyao Zhang7Xinyang Li8Wancai Li9Sergio Speziale10Dongzhou Zhang11Jung‐Fu Lin12Takashi Yoshino13Deep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaInstitute for Planetary Materials Okayama University Misasa JapanDeep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDeep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDeep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDeep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaDeep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaEarth and Planetary Sciences Stanford University Stanford CA USAState Key Laboratory of High Pressure and Superhard Materials College of Physics Jilin University Changchun ChinaCAS Key Laboratory of Crust‐Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaGFZ German Research Centre for Geosciences Potsdam GermanyGeoSoilEnviroCARS University of Chicago Argonne IL USADepartment of Earth and Planetary Sciences Jackson School of Geosciences The University of Texas at Austin Austin TX USAInstitute for Planetary Materials Okayama University Misasa JapanAbstract 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.https://doi.org/10.1029/2024GL114146(Al, H)‐bearing stishovitephase transitionmid‐lower mantlesmall‐scale seismic scatterers |
| spellingShingle | Yingxin Yu Youyue Zhang Luo Li Xinyue Zhang Denglei Wang Zhu Mao Ningyu Sun Yanyao Zhang Xinyang Li Wancai Li Sergio Speziale Dongzhou Zhang Jung‐Fu Lin Takashi Yoshino Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite Geophysical Research Letters (Al, H)‐bearing stishovite phase transition mid‐lower mantle small‐scale seismic scatterers |
| title | Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite |
| title_full | Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite |
| title_fullStr | Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite |
| title_full_unstemmed | Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite |
| title_short | Unraveling the Complex Features of the Seismic Scatterers in the Mid‐Lower Mantle Through Phase Transition of (Al, H)‐Bearing Stishovite |
| title_sort | unraveling the complex features of the seismic scatterers in the mid lower mantle through phase transition of al h bearing stishovite |
| topic | (Al, H)‐bearing stishovite phase transition mid‐lower mantle small‐scale seismic scatterers |
| url | https://doi.org/10.1029/2024GL114146 |
| work_keys_str_mv | AT yingxinyu unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT youyuezhang unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT luoli unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT xinyuezhang unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT dengleiwang unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT zhumao unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT ningyusun unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT yanyaozhang unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT xinyangli unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT wancaili unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT sergiospeziale unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT dongzhouzhang unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT jungfulin unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite AT takashiyoshino unravelingthecomplexfeaturesoftheseismicscatterersinthemidlowermantlethroughphasetransitionofalhbearingstishovite |