RELATIONSHIPS OF COTICULE GEOCHEMISTRY TO STRATIGRAPHY IN THE PERRY MOUNTAIN AND MEGUNTICOOK FORMATIONS, NEW ENGLAND APPALACHIANS
Bibliographic record
Abstract
Coticules (garnet-rich quartzites) are chemically distinctive lithologies of controversial origin. They generally occur in pelitic schists, amphibolites, cherts, and quartzites as thin layers or discontinuous lenses in Paleozoic formations in the New England Appalachians and other orogenic belts. Geochemical data were collected to characterize coticules and their host rocks from the Middle Silurian Perry Mountain Formation of southern New Hampshire (near Rochester) and western Maine (near Rangeley), and the Cambrian Megunticook Formation of coastal Maine (Camden and Calais). Relative to their host rocks, the coticules are enriched in Fe, Mn, and P, and depleted in Ti and alkalis. Electron-microprobe analyses of garnet show higher spessartine and lower almandine components relative to garnet in the host. Coticules are light- REE -enriched and heavy- REE -depleted. They have concentrations between 10 and 100 times those of chondrites, generally lack a Ce anomaly, and have a negative Eu anomaly. Major-element compositions and REE profiles argue strongly against a hydrothermal origin for these rocks, and do not obviously support a hydrogenous (diagenetic) origin such as Mn–Fe formation. Rare-earth-element patterns differ as much within a local area as for widely separated samples within a single formation. All three samples from the Megunticook Formation are nearly identical, supporting stratigraphic correlation. But they are also like some of the Perry Mountain Formation samples, so that coticule compositions for a formation are not unique.
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How this classification was reachedexpand
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) | 0.000 | 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 teacher head, 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".