Stratigraphy and geochemistry of Ordovician volcanic rocks of the Eel River area, west-central New Brunswick
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Bibliographic record
Abstract
Early Paleozoic turbiditic sedimentary rocks and submarine volcanic-arc rocks in the Mel River area have been designated, respectively as the Woodstock and Meductic groups and divided into six formations. The Woodstock Group includes interbedded Cambrian to Early Ordovician quartz wacke, sandstone, and shale of the Baskahegan Formation and overlyng Early Ordovician silty mudstone and shale of the Bright Eye Brook Formation The conformably overlying Meductic Group is divided into the Early Ordovician Porten Road Formation (mainlv rhyolite). Eel River Formation (mainly andesite) and Oak Mountain Formation (basalt), and Late Ordovician Belle Lake Formation (feldspathic wacke and shale). Pyrovene-bearing low-silica andesite in the lower part of the Porten Road Formation is highly enriched in LREE and LESE and depleted in HESE relative to MORB. evidence of subduction in a compressional-continental arc setting. The upper part of the Porten Road Formation comprises an interlayered sequence of quartz-rich rhyolite and quartz-poor dacite likely derived from melting of continental crust. The Eel River Formation contains hornblende-bearing, high-silica andesite moderately enriched in LFSE. Calc-alkaline basalt from the overlying Oak Mountain Formation includes low- and high-alumina basalt varieties like those formed in an extensional-continental arc setting. Volcanic activity in the Meductic Group ceased in the later part of the Early Ordovician as the arc rifted and the subduction zone migrated northwestward with the opening of the tetagouche back-arc basin. RÉSUMÉ Des roches dun arc volcanique sous-matin et des roches sédimentaires turbiditiques du Palérozoique inférieur du secteur d'Eel River ont été désignées, respectivement groupes de Meductic ct de Woodstock et ont été subdivisées en six formations Le groupe de Woodstock comprend du schiste et du grès à wacke quartzifere interlites du Cambrien à I'Ordovicien inferiéur de la Formation de Baskahegan ainsi que du schiste et du mudslone silleux sus-jacent de I'Ordovicien inférieur de la Formation de Bright Eye Brook. Le groupe sus-jacent concordant de Meductic se subdivisc en trois formations de I'Ordovicien inférieur celle de Porten Road (essentiellement de la rhyolite) celle d'Eel River (essentiellement de I'andesile) et celle d'Oak Mountain (basalte) et une formation de l’Ordovicien supéricur. La Formation de Belle Lake (wacke feldspalhique et schiste). L'andesite a faible teneur en silice qui renferme de la pyroxene dans la panic inféricure de la Formation de Porten Road est fortement enrichie en EERE (éléments de terres rares légers) et en EEFC (éléments à faible intensate de champ) et pauvrce en EHIC (éléments à haute intensité de champ) comparativement aux BDMO (basaltes de la dorsale médio-océanique). ce qui temoigne d’une subduction au cours de l’établissement d’un arc compressif-continental. La partie supérieur de la Formation de Porten Road comporte une séquence interstratifiée de rhyolite riche en quartz et de dacite pauvre en quartz provenant stratisemblahlement de la fusion de la croôte contineniale. La Formation d'Eel River renferme de I'andésite riche en silice à hornblende moyennement enrichie d'EEIC. Le basalte calco-alcalin de la formation sus-jacente d'Oak Mountain comprend des basaltes à faible et forte teneur en alumine comnie ceux formes lors de I'etablissemenl d’un arc d'accretion-continetital. L'activité volcanique dans le groupe de Meductic à cessé vers la tin de I'Ordovicien inférieur lorsque l’are s'est effondré et que la zone de subduction a migré vers le nord-ouest avec I'ouverture du bassin marginal de l’étagouche Traduit par la rédaction
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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) | 0.002 | 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