Petrography, Mineralogy, and Geochemistry of the Nkamouna Serpentinite: Implications for the Formation of the Cobalt-Manganese Laterite Deposit, Southeast Cameroon
Bibliographic record
Abstract
The Nkamouna Co-Mn-Ni laterite is in advanced exploration project located in southeast Cameroon. The deposit comprises a deep and complex laterite profile with high Co (similar to 0.25 wt%) and Mn (1.33 wt %) contents, subeconomic Ni grade and a Ni:Co ratio of less than 3. This makes Nkamouna an unusual type of laterite deposit as it will be primarily mined for Co. The Co-Mn mineralization occurs it the interface between an overlying allochthonous felsic rock-sourced laterite and a lower in situ serpentinite- derived laterite. The serpentinite is massive with a nonpseudomorphic texture and consists of two genetically related phases: Serpentinite-I and Serpentinite-II. Serpentinite-I is characterized by antigorite, magnetite, quartz, ferritchromite, and magnesite, and Serpentinite-II by antigorite and magnesite. Both serpentinite types are extremely low in sulfides. Serpentinite-I is the dominant and oldest phase and was derived from a subcontimental mantle (pyroxene-rich) peridotite emplaced in die crust during the Pan-African orogeny. The Ni concentration in the serpentinite is variable (0.07-0.30%) heterogeneously distributed, partly reflecting the present dominance of pyroxenes in the protolith. However, Ni is also hosted by magnetite and ferritchromite. The differential weathering of these Ni-hosting minerlas is also responsible for the lower Ni grade of the deposit. Importantly, the serpentinite is depleted in Co and Mn and the enrichment of these cilia 0(21115 in the laterite profile suggests that these elements May be derived from an exotic source.
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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 | 0.001 | 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".