Provenance, paleoweathering and maturity study of shales in the Mundeck Formation of Kribi-Campo sub-basin in the western African margin (A geochemical approach)
Bibliographic record
Abstract
The geochemical investigation of shales from Mundeck Formation of the Kribi-Campo sub-basin was conducted to determine the origin, tectonic setting evolution, paleo-weathering conditions, sediment maturity and cycling. The research included a comprehensive field survey, sample collections, and analysis of a variety of major, trace, and rare-earth elements using inductive couple plasma-atomic emission spectrum (ICP-AES) and inductive couple plasma-mass spectrum (ICP-MS). Provenance plots of La/Sc, Th/Co, Cr/Th, Th/Sc ratios and Zr vs TiO 2 , Al 2 O 3 vs TiO 2 disclosed a felsic to mixed rock composition as the source rock of the studied shales. The felsic to mixed source rock compositions are also supported by an enrichment of LREE/HREE and a negative europium anomaly on chondrite calculation and chondrite normalized diagram. Discriminant diagrams of DF(A-P)M, and DF(A-P)MT used, designate an active marginal source rock for the studied shales. The active margin signature in this work shows the source rocks of the study shales was affected by the tectono thermal events of the Pan African Orogeny also known as the Brasiliano orogeny in South America. The chemical index of alteration (CIA and CIX) and the plagioclase index of alteration (PIA and PIX) suggest weak to extreme intensity. These variations are cause by potassium enrichment and depletion during weathering. The old and new ICV calculated values suggest that the shales are immature to mature. The plots of Zr and (La/Yb) N , Th/Sc and (Gd/Yb) N ratios show the studied shales are positive correlated and fall away from the zircon addition domain, thus confirming that they are immature to mature first cycle sediments.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.000 | 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 teacher head, 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".