Fluid inclusion studies of the Pea Ridge iron-oxide-rare earth elements deposit, Missouri.
Bibliographic record
Abstract
The Pea Ridge iron oxide-REE deposit is hosted by the Mesoproterozoic St. Francois granite-rhyolite terrane in southeast Missouri and is considered to be an example of an Olympic Dam-type deposit. Primary aqueous, liquid-vapour (LV) inclusions in apatite from the early amphibole stage have salinities of 14 to 24 equiv. wt. % NaCl+CaCl2 and Th (L-V) values of 130°C to 180°C. Primary fluid inclusions in quartz from the post-magnetite hematite stage comprise aqueous liquid-only and liquid-vapour inclusions. This association, and homogenization temperatures of around 100°C for many of the LV inclusions, indicates low depositional temperatures. The LV inclusions have salinities of 21 +/- 3 equiv. wt. % NaCl+CaCl2. Primary inclusions in quartz from the silicification stage, which surrounds the magnetite and hematite zones, comprise liquid-vapour-halite (LVH) inclusions that have salinities between 34 and 48 equiv. wt. % NaCl. Primary inclusions in quartz from late-stage REE-rich breccia pipes consist of LV inclusions that exhibit two salinity populations; one is moderately saline (∼20 wt. %) and one is dilute (0--5 wt. %). Microthermometry data suggest that there are three types of fluids responsible for the formation of the Pea Ridge deposit. (Abstract shortened by UMI.) Source: Masters Abstracts International, Volume: 41-04, page: 1036. Advisers: I. M. Samson; B. J. Fryer. Thesis (M.Sc.)--University of Windsor (Canada), 2002.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".