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Metal Saturation and the Redistribution of Hydrogen in Earth's Mantle

T0 review · 2 major / 1 minor · reviewed 2026-05-13 · grok-4.3

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Pith's one-line read Metallic iron from disproportionation saturates the lower mantle and reduces subducted hydrogen, drying the deep layers while allowing water to rise and wet the shallow mantle.

desk verdict Metal saturation from iron disproportionation can redistribute subducted hydrogen and cut mantle water storage by 64-96%, but the numbers rest on HeFESTo extrapolations that the abstract itself flags as uncertain above 50 GPa. read the letter →

arxiv 2605.11245 v1 submitted 2026-05-11 physics.geo-ph

Junjie Dong , Lars P Stixrude , Paul D Asimow , Jie Li This is my paper · ORCID
classification physics.geo-ph
keywords mantlehydrogenwaterstorageirondisproportionationredoxsubductionviscositythermodynamics
checked against Cost.FunctionalEquationFoundation.RealityFromDistinction
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper argues that iron disproportionation in silicates produces metallic iron throughout much of the lower mantle across a wide range of oxidation states. Subducted hydrated silicates that reach these metal-saturated zones undergo redox reactions that convert structurally bound hydrogen into mobile reduced forms such as molecular hydrogen or iron hydrides. This leaves deep mantle rocks effectively dry and permits hydrogen to migrate upward, where it can form hydrous melts that rehydrate the overlying mantle or accumulate near the transition zone. The net effect is a sharp internal contrast between a wet shallow mantle and a dry deep mantle, with the overall water storage capacity of mantle silicates falling by 64-96 percent.

What carries the argument

Iron disproportionation in silicates that generates metallic iron, followed by its redox reaction with hydrogen in subducted hydrated phases.

What would settle it

Direct sampling or remote sensing that shows substantial retained water in lower-mantle minerals or the absence of any viscosity jump at the upper-lower mantle boundary would falsify the predicted redistribution.

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Extended reading notes

Core claim

Iron disproportionation reactions in mantle silicates produce metallic iron that drives Earth's deep mantle toward metal saturation under reduced conditions. Subducting slabs transport hydrated silicates to these depths, where interactions with metallic iron reduce structurally bound hydrogen to reduced hydrogen-bearing phases such as molecular hydrogen or iron hydrides, leaving mantle rocks in effect dry. Metal saturation can thus redistribute hydrogen internally, creating a sharp contrast between a wet shallow mantle and a dry deep mantle, decreasing mantle silicate water storage capacity by 64-96% today to only 0.1-0.8 modern ocean masses.

Load-bearing premise

Subducting slabs carry enough hydrated silicates into the metal-saturated lower mantle for significant reduction to occur, and thermodynamic models correctly predict metallic iron stability and hydrogen speciation at pressures above 50 GPa.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 1 minor

Summary. The paper claims that iron disproportionation produces metallic iron in mantle silicates, driving metal saturation under reduced conditions. Subducting hydrated silicates interact with this metal to reduce structurally bound hydrogen to H2 or FeH_x phases, leaving deep mantle rocks effectively dry. Using the HeFESTo thermodynamic code with self-consistent iron-phase treatment, the authors model metallic iron stability in pyrolitic mantle for whole-rock Fe3+/ΣFe ratios of 1-10%. They find metal present through much of the lower mantle (extending into the upper mantle at 1-3% ratios). This enables redox-driven internal hydrogen redistribution, producing a wet shallow mantle and dry deep mantle. The process is said to decrease silicate water storage capacity by 64-96% today (to 0.1-0.8 modern ocean masses) and may explain the viscosity contrast near the upper-lower mantle boundary. Quantitative estimates are noted to depend on thermodynamic assumptions and remain uncertain above 50 GPa.

Significance. If the modeled mechanism holds, it supplies a self-consistent redox pathway for generating sharp mantle hydration contrasts and viscosity changes driven by subduction and iron disproportionation, without external water sources. This could help reconcile geophysical observations of upper-mantle hydration with lower-mantle dryness. The use of HeFESTo's self-consistent thermodynamic database for iron-bearing phases across a range of oxidation states is a clear strength, allowing systematic exploration of metal stability as a function of Fe3+/ΣFe.

major comments (2)
  1. [Abstract] Abstract: The central quantitative result (64-96% reduction in silicate water storage capacity, yielding 0.1-0.8 ocean masses) is derived from HeFESTo outputs for metallic iron stability and H speciation. The abstract itself states that 'quantitative estimates of metal abundance and distribution depend on thermodynamic assumptions and remain uncertain above 50 GPa,' yet no sensitivity tests, alternative databases, or comparisons to high-pressure experiments (e.g., diamond-anvil cell data on Fe-bearing pyrolite at 25-100 GPa) are described. This directly limits in the reported percentages and the viscosity-contrast explanation.
  2. [Abstract] Abstract: The claim that subducting slabs deliver sufficient hydrated silicates to metal-saturated lower-mantle regions for significant reduction reactions is asserted without supporting flux calculations, slab transport models, or estimates of reaction efficiency. This assumption is load-bearing for the proposed redistribution mechanism but is not quantified or tested within the presented modeling framework.
minor comments (1)
  1. [Abstract] Abstract: The ratio 'whole-rock Fe3+/ΣFe' is introduced without a parenthetical definition on first use, although it is standard in the field; adding '(ferric iron to total iron)' would improve immediate clarity for a broad readership.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thoughtful comments on our manuscript. We provide point-by-point responses to the major comments below and outline revisions to address the concerns raised.

read point-by-point responses

  1. Referee: [Abstract] Abstract: The central quantitative result (64-96% reduction in silicate water storage capacity, yielding 0.1-0.8 ocean masses) is derived from HeFESTo outputs for metallic iron stability and H speciation. The abstract itself states that 'quantitative estimates of metal abundance and distribution depend on thermodynamic assumptions and remain uncertain above 50 GPa,' yet no sensitivity tests, alternative databases, or comparisons to high-pressure experiments (e.g., diamond-anvil cell data on Fe-bearing pyrolite at 25-100 GPa) are described. This directly limits in the reported percentages and the viscosity-contrast explanation.

    Authors: We agree that the quantitative results depend on the thermodynamic model employed, as already noted in the abstract. The HeFESTo database is self-consistent and incorporates the latest experimental constraints on iron-bearing phases. However, we recognize that explicit sensitivity tests to alternative databases or direct comparisons to diamond-anvil cell experiments at pressures above 50 GPa are not included. In the revised manuscript, we will expand the discussion to include a qualitative assessment of how variations in thermodynamic parameters might affect metal stability and add references to relevant high-pressure experimental studies on Fe-bearing pyrolite. Full quantitative sensitivity analyses would require substantial additional computational work and are beyond the current scope, but we will highlight this limitation more prominently. Thus, this will be addressed partially through enhanced discussion. revision: partial

  2. Referee: [Abstract] Abstract: The claim that subducting slabs deliver sufficient hydrated silicates to metal-saturated lower-mantle regions for significant reduction reactions is asserted without supporting flux calculations, slab transport models, or estimates of reaction efficiency. This assumption is load-bearing for the proposed redistribution mechanism but is not quantified or tested within the presented modeling framework.

    Authors: The primary focus of our study is the thermodynamic modeling of metal saturation in the mantle using HeFESTo and the implications for hydrogen speciation upon interaction with subducted water. We do not perform detailed slab transport or flux calculations, as these are typically addressed in geodynamic modeling studies. The assertion is based on the established fact that subducting slabs carry significant amounts of water into the mantle and that metal-saturated regions exist in the lower mantle according to our models. To address this, in revision we will include order-of-magnitude estimates of subducted water flux drawn from the literature and discuss the potential efficiency of redox reactions based on experimental studies of iron-water interactions. We will clarify that while the mechanism is thermodynamically feasible, quantitative global redistribution rates require integration with geodynamic models. This represents a partial revision focused on adding supporting context from existing literature. revision: partial

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; forward modeling via external thermodynamic code

full rationale

The derivation consists of running the external HeFESTo code (with its self-consistent iron-phase treatment) over a range of whole-rock Fe3+/ΣFe values to determine metallic iron stability, then using those results to infer possible redox-driven hydrogen redistribution and storage-capacity reduction. No equations or steps in the abstract reduce a claimed prediction back to a fitted parameter or self-citation by construction. The paper explicitly flags that quantitative estimates depend on thermodynamic assumptions and remain uncertain above 50 GPa, treating the output as model-dependent rather than a self-derived necessity. This is a standard forward-modeling workflow against external benchmarks and does not match any of the enumerated circularity patterns.

Assumptions & free parameters 1 free parameters · 2 assumptions · 0 invented entities

The central claim rests on the HeFESTo thermodynamic database, which incorporates numerous parameters fitted to experimental data, plus the assumption that equilibrium phase calculations apply to the described redox reactions; the oxidation-state range is treated as an input variable rather than a fitted output.

free parameters (1)
  • whole-rock Fe3+/ΣFe ratio = 1-10%
    Varied from 1% to 10% to represent different mantle oxidation states and determine the extent of metallic iron stability
assumptions (2)
  • domain assumption Thermodynamic equilibrium governs phase stability and speciation in mantle silicates
    Invoked throughout the HeFESTo calculations for metallic iron presence and hydrogen reduction
  • domain assumption Subducting slabs deliver hydrated silicates to metal-saturated lower-mantle depths
    Required for the interaction that produces hydrogen redistribution to occur

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Pith. "Pith review of Metal Saturation and the Redistribution of Hydrogen in Earth's Mantle." pith.science (2026). https://pith.science/paper/2605.11245

@misc{pith2026260511245,
  author       = {Pith},
  title        = {Pith review of: Metal Saturation and the Redistribution of Hydrogen in Earth's Mantle},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/2605.11245}},
  note         = {Machine review of arXiv:2605.11245}
}
abstract

Iron disproportionation reactions in mantle silicates can produce metallic iron that drives Earth's deep mantle toward metal saturation under reduced conditions. Subducting slabs transport hydrated silicates to these depths, where interactions with metallic iron can reduce structurally bound hydrogen in silicates to reduced hydrogen-bearing phases, such as molecular hydrogen or iron hydrides, leaving mantle rocks in effect dry. Using the thermodynamic code HeFESTo with its latest self-consistent treatment of iron-bearing mantle phases, we investigate the stability and distribution of metallic iron in Earth's pyrolitic mantle across a broad range of oxidation states, represented by whole-rock Fe3+/$\Sigma$Fe ratio from 1% to 10%. We find that metallic iron is present through much of the lower mantle across this range and, under very reduced compositions of whole-rock Fe3+/$\Sigma$Fe = 1-3%, extends into the upper mantle. Where subducted water meets metal-saturated regions, hydrous melts may form and migrate upward, rehydrating the overlying mantle or pooling near the transition zone. Metal saturation can thus redistribute hydrogen internally, creating a sharp contrast between a wet shallow mantle and a dry deep mantle. This redox-driven redistribution can decrease mantle silicate water storage capacity by 64-96% today, to only 0.1-0.8 modern ocean masses, and may explain the viscosity contrast near the upper-lower mantle boundary. Although quantitative estimates of metal abundance and distribution depend on thermodynamic assumptions and remain uncertain above 50 GPa, our results reveal the role of redox reactions between disproportionated iron and subducted water in governing the speciation and redistribution of hydrogen in Earth's mantle.

Figures

Figures reproduced from arXiv: 2605.11245 by the authors.

Figure 1
Figure 1. Predicted ferric content in mantle minerals within pyrolite at whole-rock Fe3+/ P Fe = 1%, benchmarked against experimental data collected under similarly reduced conditions. This composition represents a reduced endmember of Earth’s mantle, in which metal saturation is present at all depths above 10 GPa with f O2(∆IW) ≈ −1. (a) Ferric content in clinopyroxene show negligible temperature dependence but increases sli… view at source ↗
Figure 2
Figure 2. Distribution of metallic Fe0 in the present-day mantle (Tp = 1600 K) for the reduced (1%, a) and oxidized (10%, b) endmembers. (a) In the reduced endmember, metal saturation begins in the upper mantle, and Fe0 abundance decreases with depth as metal production from bridgmanite becomes less favorable at higher pressure. (b) In the oxidized endmember, metal saturation is confined to the upper- and mid-lower mantle and… view at source ↗
Figure 3
Figure 3. Widespread metal saturation destabilizes structural OH in NAMs, resulting in a dry deep mantle. Dis￾tribution of metal abundance (a) and water storage capacity (b) in Earth’s mantle are modeled as functions of depth (km), potential temperature Tp (K), and oxidation state, expressed as the whole-rock Fe3+ / P Fe ratio (%). Present-day whole-rock Fe3+ / P Fe = 1–3% yields persistent metal saturation from the upper to … view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: Metallic Fe0 amounts to 8.6–10.5 × 1021 kg (2120–2600 ppm by weight) in Earth’s mantle today, stabilizing near the base of the upper mantle and extending to the core–mantle boundary. Whole-mantle metallic Fe0 abundance (a) and saturation depth (b) are modeled as functi…
Figure 5
Figure 5. Figure 5: Whole-mantle water storage capacity falls by 64–96% today, from 2.3 to 0.1–0.8 modern ocean masses, when metal saturation is taken into account. Whole￾mantle water storage capacity with metal saturation (this work, a) are modeled as functions of potential temperature T…

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Pith tools

Reviewed May 13, 2026 · model on record in the stance chip above.