A TEXTURAL AND GEOCHEMICAL GUIDE TO THE IDENTIFICATION OF HYDROTHERMAL MONAZITE: CRITERIA FOR SELECTION OF SAMPLES FOR DATING EPIGENETIC HYDROTHERMAL ORE DEPOSITS
Why this work is in the frame
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Bibliographic record
Abstract
Hydrothermal monazite is one of the most reliable geochronometers for U-Pb dating of epigenetic or hydrothermal ore deposits because its blocking temperature, at ca.700°C, is higher than that of most metamorphic conditions. Although igneous monazite is routinely used for age dating igneous rocks, only a few ore deposits have been dated by hydrothermal monazite. This is due to the similar morphology of hydrothermal and igneous monazite, which prevents the reliable distinction of hydrothermal monazite, in particular. We demonstrate that hydrothermal monazite can be distinguished from igneous monazite by its unique geochemical signature, its local abundance, and to common association with hydrothermal mineral assemblages. Our data and the data of others reported in the literature suggest that the low ThO 2 content of hydrothermal monazite (0–1 wt %) is distinct from that of igneous monazite (3 to >5 wt %) and may be used to determine their genesis.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it