Pan-African structural evolution of Paleoproterozoic basement gneiss and Cu-Co mineralized shear zones in the Domes Region of the Lufilian Belt, Mwombezhi Dome, Zambia
Bibliographic record
Abstract
A B S T R A C TIn the Domes Region of the Lufillian Belt, world-class stratiform Cu (±Co,±Ni,±U,±Pb,±Zn) deposits areclosely associated with tectonized pre-existing basement unconformities, viz. the pre-Katanga-basementdécollement (KD). In the KD footwall on the Mwombezhi Dome, the Lumwana Mine exploits mineralizationwithin<60m thick, laterally-extensive shear zones beneath kilometer-scale thrust sheets of Paleoproterozoicgneiss and schist. New field data and structural analysis highlight preferential strain localization, kinematics andsequential reactivation of multiple shear zone generations (D1-3) under high- to medium-grade, metamorphicconditions and clockwise P-T-t path during the Lufillian Orogeny (ca. 550-500). Regional, progressive, top-tothe-NNE fore-thrusting is assigned to D1, while D2 represents localized, opposite, top-to-the-SSW kinematicsattributed to under-thrusting by dome-scale fore-thrusted basement slivers. Subsequent D3 shear zones transposedD1-2 structures and represent overall top-to-the-NNE extensional detachment and NNE-SSW-elongationalong a maximum principal extension axis (L3) which defines kilometer-scale shear- or asymmetrical-boudins ofcompetent gneiss in the KD footwall. A pre-existing NNE-SSW prolate dome asymmetry (L1-2) dictates adownlimb-directed sense of shear on the short axes of D3 asymmetrical boudins (WNW-ESE). D3 shear zones arepreferentially localized along relict pre-Katanga anisotropy and D1-2 mylonitic horizons, while Cu–Co bearingore shoots are associated with passive fold hinges in these asymmetrical boudin necks.
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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 | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".