Lithospheric Thickness, Rift and Inversion Tectonics: The Formation and Deformation of the Neoproterozoic Katangan Basin of Central Africa.
Bibliographic record
Abstract
The tectono-stratigraphic development of continental basins is key to our understanding of the location and scale of metal deposits required by the energy transition. We examine the Neo-proterozoic Katangan copper basin of Central Africa to determine the link between lithosphere and crust and the generation of potential fluid pathways. Integration of lithospheric thickness, quantitative basin analysis and structure, defines a basin scale tectono-stratigraphic model for controls on potential fluid pathways. The basin developed along the thinned (140-170 km thick) margins of the Congo, Kalahari and Bangweulu cratons. Crustal scale fault zones define these margins and imply a mechanical weakness in the basin. Drill core and seismic data show extensional, half graben geometries. Basin subsidence analysis indicates two phases of rift-driven subsidence and increasing lithospheric extension from the basin boundary to a Central Rift Zone (CRZ). The CRZ also maps out as a sediment provenance boundary. Subsequent Late Ediacaran and Cambrian orogenesis and rift-fault inversion occurred most intensively within the CRZ. Basin expulsion and thrust tectonics resulted in a narrow belt of crustal thickening defined today by a ~50 km wide zone of garnet amphibolite facies metamorphism. The spatial coincidence of early crustal extension, relatively thin lithosphere, and later intense basin inversion along the CRZ, indicates that pre-existing crustal structure and weakness was a key tectonic control. The reactivated structures define several tectonic domains, control basin architecture within the zones and occur as potential fluid pathways for high volume fluid migration for metal bearing brines.
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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 | 0.000 |
| Scholarly communication | 0.000 | 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".