Journal Article

PUBDB-2026-02411

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Serpentine’s wet breakdown path and enhanced water flux in cold subduction zones

Sim, H. ; Bang, Y.Extern* ; Hwang, H.Extern*XFEL.EU* ; Giordano, N.DESY* ; Zhang, D. ; Lee, H. H.Extern*XFEL.EU* ; Jeon, T. ; Farla, R.DESY* ; Liermann, H.-P.XFEL.EU*DESY* ; Lee, Y. (Corresponding author)Extern*XFEL.EU*

2026
Springer Nature [London]

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Please use a persistent id in citations: doi:10.1038/s41467-026-75935-4  doi:10.3204/PUBDB-2026-02411

Abstract: Serpentine stability dictates deep water cycling in subduction zones. We investigated pure serpentinites (≈ 13 wt.% H2O) using in-situ synchrotron X-ray diffraction and ultrasonic velocity measurements under two cold-slab P–T paths, varying excess water (0.9–31.5 wt.%). Here we report that under a cold core (or ultracold Moho) geotherm with >6.9 wt.% excess water, serpentinites undergo deep hydration to form the 3.65-Å phase and phase E above 9.3 GPa and 420 °C (ca. 280 km depth), increasing total water to ≈ 19.3 wt.%. With <6.9 wt.% excess water, serpentine transforms to phase E without water loss. Conversely, under a cold Moho geotherm, serpentinites dehydrate into phase E and clinoenstatite above 7.4 GPa and 585 °C (ca. 220 km depth), releasing ≈ 5.3 wt.% water. These divergent reactions highlight an underestimated water transport capacity of subducting slabs, generating lateral contrasts in hydration, density, and seismic velocity.

Note: 05K16WC2 P61B at PETRA-III

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Contributing Institute(s):

1. PETRA-D (FS-PETRA-D)
2. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 631 - Matter – Dynamics, Mechanisms and Control (POF4-631) (POF4-631)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20220264 (I-20220264) (I-20220264)
4. FS-Proposal: I-20231080 (I-20231080) (I-20231080)

Experiment(s):

1. PETRA Beamline P02.2 (PETRA III)

Appears in the scientific report 2026

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