Tectonostratigraphic and petrogenetic setting of late Mississippian volcanism in eastern Canada
Bibliographic record
Abstract
In the aftermath of the Middle Devonian Acadian Orogeny, a thick mafic body is inferred to have been emplaced at the base of the crust during development of the Maritimes Basin complex in eastern Canada and is believed to have sourced regional Late Devonian to Mississippian volcanism. By late Mississippian times, volcanism was limited to central New Brunswick and the Magdalen Islands of eastern Quebec. Whereas Late Devonian to early Mississippian mafic volcanism was mainly characterized by subalkaline lavas produced by the high-degree partial melting of a subduction-enriched lithospheric mantle source, late Mississippian volcanism was dominated by alkali mafic lavas produced by the low-degree partial melting of a sublithospheric mantle source that shows no evidence of subduction imprint. Two distinct upper Mississippian volcanic successions were identified in central New Brunswick and are estimated to be separated by ∼7 million years based on U–Pb dates on felsic intervals. They respectively belong to the Cumberland Hill Formation and a new volcanic member of the Hopewell Cape Formation. As they share close geochemical affinities, we interpret both volcanic units as having been derived from the same primary source but from distinct magmatic pulses. Based on the sedimentology of interbedded clastic units as well as available mapping and geophysical data in New Brunswick, we interpret that the upper Mississippian mafic lavas were issued from large NW–SE striking dykes responding to NW–SE compression in a pull-apart basin, whereas less voluminous and more localised felsic rocks were possibly issued from discrete volcanic pipes.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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 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".