The Karibib region as an emerging gold district in the Damara Belt, Namibia: a review and regional interpretation of controls on mineralization
Bibliographic record
Abstract
Abstract Recent discoveries around existing gold deposits and prospects demonstrate the significance of the Karibib region in the south Central Zone of the Pan-African Damara Belt in central Namibia as an emerging gold district. This paper aims to identify the underlying structural and lithological controls of the gold mineralization in individual deposits and prospects. Gold occurrences throughout the region are hosted by the lithologically heterogeneous, amphibolite-facies, carbonate-siliciclastic metasedimentary sequence of the Neoproterozoic Swakop Group. Gold is exclusively associated with quartz-vein systems and associated sulfides, primarily pyrrhotite, arsenopyrite, pyrite, and minor chalcopyrite. The geometry of the vein systems varies systematically between deposits and prospects but shows close relationships with the main generation of east-northeasterly trending folds and thrusts that formed during the main phase of northwest-southeast directed, subhorizontal shortening (D 2/3 ) between ca. 530 − 510 Ma. Sites of economic gold mineralization correspond to a combination of (1) contacts between rock types of distinctly contrasting rheology along which strain localization promoted fracturing and veining in more competent rocks, (2) high-strain zones that localized regional fluid flow, mainly along steep fold limbs of regional-scale folds, and (3) regional-scale deflections of wall-rock structures and jog-like geometries that resulted in either dilational or contractional structural sites. It is the combination and interplay of these factors that control the formation of auriferous quartz-vein systems in the Karibib region.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.008 | 0.008 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 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".