Phase Transition of Enstatite‐Ferrosilite Solid Solutions at High Pressure and High Temperature: Constraints on Metastable Orthopyroxene in Cold Subduction

Xu, Jingui; Fan, Dawei; Zhang, Dongzhou; Guo, Xinzhuan; Zhou, Wenge; Dera, Przemyslaw K.

doi:10.1029/2020GL087363

Title: Phase Transition of Enstatite‐Ferrosilite Solid Solutions at High Pressure and High Temperature: Constraints on Metastable Orthopyroxene in Cold Subduction

Journal Article · Sat Jun 13 00:00:00 EDT 2020 · Geophysical Research Letters

DOI:https://doi.org/10.1029/2020GL087363· OSTI ID:1633390

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Key Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior, Institute of Geochemistry Chinese Academy of Sciences Guiyang China, Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology University of Hawai'i at Manoa Honolulu HI USA
Key Laboratory for High‐Temperature and High‐Pressure Study of the Earth's Interior, Institute of Geochemistry Chinese Academy of Sciences Guiyang China
Hawai'i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology University of Hawai'i at Manoa Honolulu HI USA

Abstract (Mg, Fe)SiO ₃ orthopyroxene is an abundant mineral of oceanic subducting slabs. In‐situ high‐pressure and high‐temperature single‐crystal X‐ray diffraction has been used to investigate the phase transition of orthopyroxene across the enstatite‐ferrosilite (En‐Fs) join (En ₇₀ Fs ₃₀ , En ₅₅ Fs ₄₅ , En ₄₄ Fs ₅₆ and Fs ₁₀₀ ) up to 24.3 GPa and 800 K, simulating conditions within the coldest part of a subduction zone consisting of an old and rapidly subducting slab. Instead of the orthopyroxene → high‐pressure clinopyroxene transition, the α‐opx → β‐opx and β‐opx → γ‐opx phase transition are observed at 7.2–15.3 and 11.6–21.1 GPa (depending on the Fs content), respectively. This study indicates that the pressure‐induced phase transition of (Mg, Fe)SiO ₃ orthopyroxene under relatively low temperature (<800 K) could be different than those occurring under relatively high temperature (>800 K). Additionally, the α‐opx → β‐opx → γ‐opx phase transition could exist within the center of the extremely cold slabs (like Tonga), where such low temperature persists to ~600‐km depth.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐FG02‐94ER14466; DE‐AC02‐06CH11357

OSTI ID:: 1633390

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 47 Journal Issue: 12; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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