Tectono-magmatic evolution of the southern Reykjanes Ridge, North Atlantic, from ~11 M.y. to present
Bibliographic record
Abstract
The geology of the Reykjanes Ridge reflects variations in the style of crustal accretion related to mantle plume processes and tectonic reconfigurations. Following a ~30° change in spreading direction, ridge segments progressively reassumed a linear orientation under the influence of a regional mantle melting anomaly. This process is incomplete, with ongoing reorganization along the southernmost part of the ridge. We investigate the ongoing impacts of this reorganization on ridge propagation, seafloor morphology, and structural fabrics using a combination of geophysical evidence to inform the regional and detailed remote-predictive geological mapping over the southernmost ~200 km of the ridge, covering ~11 M.y. of spreading history. Our results show that this area is more segmented than previously described, as we identify two new fracture zones. In this area, transforms evolved to discontinuities between ~8.2 and 4.2 Ma, associated with the evolution of the segments comprising the southern part of the Reykjanes Ridge. At ~9.7–8.2 Ma, a new segment (S2) forms at the expense of segment S3. The evolution of southern most part of the Reykjanes Ridge is related to magma supply associated with buoyant upwelling mantle cells. The elimination of transform motion coincides with reorientation of the seafloor fabric from N-trending at the active plate boundary, to a complex NE-trending fabric in off-axis. This results in dissection of axial volcanic ridges by the oblique plate boundary zone. The complex interplay between segment reorganization and short ridge jumps along the migrating discontinuities results in more crustal accretion to the North American plate overall.
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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 | 0.000 |
| 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) | 0.001 | 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".