Tracing Polyphase Fault Reactivation and Lithospheric Evolution Through Wilson Cycles: Thermochronological Insights From the Newfoundland Appalachians
Bibliographic record
Abstract
Abstract Fault reactivation and exhumation‐related cooling are predicted by the Wilson cycle and models for the assembly and dispersal of continents. New thermochronology data and thermal history models of basement rocks in the Newfoundland Appalachians in Atlantic Canada were conducted to test these models and track connections between structural inheritance, rock exhumation, and amalgamation and breakup of supercontinent Pangea in eastern North America. The stages at the end of the last Wilson cycle, which in the Newfoundland Appalachians culminated with subduction‐related ocean closure and Paleozoic continental assembly, are exemplified by accelerated cooling (>1°C Myr−1) and ∼5–12 km of rock exhumation along segments of the inherited Avalonia‐Ganderia suture zone. Our results confirm that continental extension initiated at ∼255 Ma. This start of a new Wilson cycle involved the reactivation of faults across a 700 km‐wide corridor of the Appalachian orogen. Accelerated Triassic to Late Jurassic cooling during the embryonic rift stage was concentrated along the inherited Avalonia‐Ganderia suture zone and included ~5–12 km of exhumation, erosion, and filling of rift basins. Late Mesozoic‐Cenozoic accelerated cooling during the transition from the late embryonic rift to young ocean stage is not recognized in Newfoundland but instead recorded in the Grand Banks ∼300–500 km offshore. The migration of extensional deformation from onshore to offshore domains shows that inherited faults are critical for accommodating stress during the early stages of extension but are surpassed by thermal and compositional factors as the lithosphere thins.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".