The metabasalts from the greenstone belt of the Lebzenia group in the Tasiast complex, Mauritania, and their geodynamic implications
Bibliographic record
Abstract
Samples of metabasalts collected from the Lebzenia Group, located in the Tasiast region of Mauritania, reveal a complex geochemical signature that highlights magmatic processes related to tectonically active environments. The analyses show low concentrations of incompatible elements such as Nb, TiO 2 , and P 2 O 5 , combined with marked negative anomalies in Nb, Ta, and Ti. These characteristics, along with an enrichment of light rare earth elements (LREE) and Th, are typical of a transitional calc-alkaline affinity commonly associated with volcanic arcs. The high Th/Nb ratios, as well as the presence of specific geochemical anomalies, suggest an interaction between an enriched mantle source and a modified continental crust. This interaction reflects partial mantle melting processes at significant depths, influenced by crustal materials or fluids from intense tectonic activity. Samples such as DRAM7 and DRAM8 show a transitional calc-alkaline affinity while exhibiting similarities to tholeiitic basalts of mantle origin. These geochemical data shed light on the diversity and complexity of the tectonomagmatic processes that contributed to the formation of the Lebzenia Group. This study enhances the understanding of the geodynamic evolution of the Tasiast region and its role in crustal growth processes during the Archaean, emphasising the contribution of mantle–crust interactions in magma genesis.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 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".