Geochemical evidence of a developing plate boundary and a SW rift extension of the East African Rift
Bibliographic record
Abstract
The Central African Plateau of Zambia and the Democratic Republic of Congo has been suggested as a broad zone of NW/SE extension based on low gravity, high heat flow and sparse and irregular seismicity. Recent multi-disciplinary tectonic analysis argued that there is a young, through going, active rift system that breaks the Nubian plate, extending from the East African Rift System (EARS), and forming a southwestern rift extension (Daly et al., 2020). The isotopic composition of helium from hot springs in the centre of this rift system adds new and compelling data to this hypothesis. Gas samples from surface vents along the faulted margin of the Kafue Rift Basin are N 2 -dominated, with up to 2.3% 4 He and 3 He/ 4 He ratios of 0.15 R/R A . The geochemical profile indicates presence of mantle fluids and enhanced release of crustal N 2 and 4 He, in line with observations of early rift stages in Rukwa basin, Tanzania [2]. CO 2 / 3 He ratios in the Kafue Rift samples are lower than MORB values by up to a factor of 200, indicating mantle CO 2 loss from the system. Mantle CO 2 is sequestered within the crust during hydrothermal fluids ascent, in contrast to CO 2dominated fluids proximal to mature EARS spreading centres. The Kafue Rift basin records geochemical signatures of the very early stage processes of lithospheric heating and weakening associated with the propagation of continental rifting.
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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 | 0.000 | 0.001 |
| 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".