Depositional environment and provenance of Early Carboniferous clastic sedimentary rocks at McIsaacs Point, Nova Scotia: implications for syntectonic basin development during the formation of Pangaea
Bibliographic record
Abstract
Abstract Following the collision of Gondwana and Laurussia to form Pangaea, a large system of regional-scale strike-slip faults developed which resulted in the formation of transtensional syncollisional basins. One such basin, the Antigonish Basin, contains late Devonian fluvial, marine and lacustrine sedimentary rocks, including sandstone, conglomerate and shale. LA-ICP-MS U–Pb detrital zircon data from three samples from the lower and middle of the McIsaacs Point section have a strong Silurian–Devonian ( c. 440–380 Ma) population whereas the top of the section lacks these age populations and is instead dominated by Neoproterozoic ( c. 630–550 Ma) grains. Detritus was derived from a mix of local Avalonian and more distal Meguma terrane sources. Detrital zircon and field data show that sediments were deposited in a braided to meandering fluvial system transitional to a proximal braided stream environment followed by evolution to a more distal braided stream environment. As the basin evolved, the source of detritus shifted from a dominantly Meguma terrane source to a more local Avalonian source. This temporal evolution in provenance and depositional environment attests to the complex depositional processes associated with syntectonic basin evolution during the formation of Pangaea.
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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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".