THE AGES OF THE KABANGA NORTH AND KAPALAGULU INTRUSIONS, WESTERN TANZANIA: A RECONNAISSANCE STUDY
Bibliographic record
Abstract
The Kabanga North and Kapalagulu intrusions form part of a >500-km belt of intrusions within the Kibaran orogenic belt of central Africa. Some of the intrusions within the belt host important ore deposits, notably Ni sulfides at Kabanga and Ni laterites at Musongati and Kapalagulu. Despite the economic significance of the intrusions their ages have remained unclear. Here, we present SHRIMP II U-Pb zircon ages, interpreted as magmatic ages of crystallization, for the Kabanga North intrusion (1403 ± 14 Ma) and for the Kapalagulu intrusion (1392 ± 26 Ma). These data, along with other geochronological and petrological data, support a model of a broadly coeval and cogenetic suite of mafic-ultramafic intrusions throughout the Kibaran orogenic belt, from northwest Tanzania through Burundi, and possibly as far south as the Democratic Republic of Congo.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".