Complex morphology of colliding  margins in Laurussia-Gondwana supercollision
Bibliographic record
Abstract
Late Paleozoic convergence between Gondwana and Laurussia culminated in terminal collisions that produced the Ouachita-Alleghanian-Mauritanian-Variscan orogen within the interior of Pangea. The evolution and architecture of this orogen was profoundly influenced by a series of ca. 400-300 Ma promontory collisions, which terminated 100 m.y. of subduction and terrane accretion along the Laurussian margin and passive margin sedimentation along the Gondwanan margin. These promontory collisions compartmentalized the orogen into several domains with very different subsequent tectonic evolutions. In Europe, the Variscan belt records coeval collisional (e.g. Iberian massif) and “Mediterranean-style” orogens (e.g. Bohemian massif). The former are characterized by crustal thickening, followed by extensional collapse. The latter occur in re-entrants and are characterized by complex orogenic collages of limited lateral extent produced by the opening and closing of ephemeral oceans. This collage includes the products of subduction of varying polarities within these oceans and accretionary collisions of local significance that preceded terminal collision. Late-stage orogenic processes are characterized by the formation of oroclines, extensional collapse, and the transition to Tethyan tectonics. Because part of the Laurentian-Mauritanide domains were located to the southwest of the promontory collisions, remnants of the Rheic Ocean persisted between them and their respective evolutions, as recorded in the Appalachian belt, are dominated by Andean-style orogenesis that preceded terminal collision. The geodynamic driver of Pangea amalgamation, by the Appalachian-Mauritanide-Variscan orogen, is consistent with the principles of orthoversion. In other collisional orogens, determining when geological continuity along converging continental margins gives way to compartmentalization may likewise document when promontory collisions have occurred.
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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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".