GIST Scholar
College of Engineering
Department of Environment and Energy Engineering
1. Journal Articles
Serpentine’s wet breakdown path and enhanced water flux in cold subduction zones
- Type
- Article
- Citation
- Nature Communications, v.17, no.1
- Issued Date
- 2026-07
- Abstract
- Serpentine stability dictates deep water cycling in subduction zones. We investigated pure serpentinites (approximate to 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-& Aring; phase and phase E above 9.3 GPa and 420 degrees C (ca. 280 km depth), increasing total water to approximate 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 degrees C (ca. 220 km depth), releasing approximate to 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.
- Publisher
- Nature Publishing Group
- Appears in Collections:
- Department of Environment and Energy Engineering > 1. Journal Articles
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