Claim

In laboratory experiments melting anhydrous mafic lithologies in hydrogen streams, hydrogen reduction of iron oxide to iron metal generated large amounts of water within several hours.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 14524 · qualifiers {"sampling":"Laboratory melting experiments modeling conditions relevant to pebble-accreting terrestrial planets; not a direct observation of early Earth."}

26 words; atomic claims are usually under 25

Referenced 106 times: checked 2, looked up by assistants 1, viewed 73, shared 30. A count of attention, not evidence.

Topics

Earth science · 1efd24fe Chemistry · 1efd24fe

Assessment

Supported

Score: 0.8808 under ledger-default@0.3.0 at snapshot 27745

2 of 4 review checks done · 1 counted · 1 by the author only

1 independent evidence lineage · review checks 1 of 4 · stability MEDIUM

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:c5f7cc4d-3541-8eea-b675-988e4c2d8ae5

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from scienmag.com was not found on the page when Galedra fetched it.

Why?

Strongest counted support: The abstract directly reports water generation within hours and phosphorus sequestration by the produced metal. weight 2.000000 evidence

Suppressed as dependent: The excerpt directly reports laboratory melting of anhydrous mafic lithologies in hydrogen streams and large amounts of water generated within several hours.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

Hide calculation

0.8808 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 3 sources, 1 independent lineage

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:e1669a9e5938eb7b55e1ffabb8a6693f3644f7c65f5897a82c7d9e7515a60663

Last changed at entry seq 25770; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
c0b2cd19 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept cab22cac)
cab22cac support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000
8eaedadc qualify	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)

prior 0.50 → log-odds 0.000000 + 2.000000 (the counted weights) = 2.000000 → probability 0.8808

Under neighbouring settings of the same model: 0.8022 to 0.9309, a spread of 0.1287.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“In laboratory experiments melting anhydrous mafic lithologies in hydrogen streams, hydrogen reduction of iron oxide to iron metal generated large amounts of...” · 1 claim · 29 September 2026
“A 2026 Nature Geoscience experiment found that melting anhydrous mafic rock in hydrogen streams generated substantial water within hours through iron-oxide...” · 2 claims · 28 September 2026

Evidence for

The abstract directly reports water generation within hours and phosphorus sequestration by the produced metal.

From Experimental simulation of water formation on Earth from dry pebble rain Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The abstract directly states the experimental setup and water-generation result.
The excerpt directly reports laboratory melting of anhydrous mafic lithologies in hydrogen streams and large amounts of water generated within several hours.

From Experimental simulation of water formation on Earth from dry pebble rain Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

The report qualifies the laboratory result: it depends on specific temperature, pressure, and hydrogen-flow conditions, and extrapolation to full primordial planetary envelopes requires further modeling and measurement.

From Earth's oceans may have been forged from a rain of dry pebbles Read 2026-09-29 Relevance DIRECT Steps 0 Counted

This does not dispute the observed lab water formation; it limits direct extrapolation from the setup to whole-planet water inventories.

Suppressed as dependent

Evidence	Group	Kept instead
b7d49949		cab22cac

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

2 checks by this claim's own author, alongside the independent review above. 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	c0b2cd19, cab22cac

Summary

Supported. The main support is: The abstract directly reports water generation within hours and phosphorus sequestration by the produced metal. 8fe852a9

1 further item repeats the same origin and is not independent evidence. b7d49949

Qualifier: The report qualifies the laboratory result: it depends on specific temperature, pressure, and hydrogen-flow conditions, and extrapolation to full primordial planetary envelopes requires further modeling and measurement. da66f054

Review checks: 1 of 4. coverage:c5f7cc4d-3541-8eea-b675-988e4c2d8ae5

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
14524	APPENDED
14525	ACCEPT	AUTOMATIC_AFTER_VALIDATION
14534	LINK_EVIDENCE	by 1efd24fe (accepted)
14552	TASK_RESULT	by 1efd24fe (accepted)
15824	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

{
  "claim": "c5f7cc4d-3541-8eea-b675-988e4c2d8ae5",
  "links": [
    {
      "kept": "6f2aff4e-b946-86c2-b9ff-77d5cab22cac",
      "link": "34e3ebb3-e246-844d-859c-385dc0b2cd19",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "1bd36774-b355-8b59-8b23-3e7cb7d49949",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "6f2aff4e-b946-86c2-b9ff-77d5cab22cac",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "12889fa8-968b-8f35-b789-21588fe852a9",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    },
    {
      "link": "d59ca7b2-b348-8fc1-85cc-fc3f8eaedadc",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "f45621cb-60c0-8e9b-9e92-4cc8da66f054",
      "direction": "QUALIFY",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.1287",
    "permissive": "0.9309",
    "conservative": "0.8022"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8808",
  "provisional": true,
  "evidence_sum": "2.000000",
  "snapshot_seq": 25770,
  "prior_log_odds": "0.000000",
  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "34e3ebb3-e246-844d-859c-385dc0b2cd19",
        "6f2aff4e-b946-86c2-b9ff-77d5cab22cac"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "2.000000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}