The value of a combined approach: Innovative mineral exploration techniques in the Irish Zn-Pb orefield
Bibliographic record
Abstract
The Early Carboniferous stratigraphy of the Irish Midlands contains one of the world’s major carbonate-hosted zinc-lead orefields covering a region of approximately 8000 km2. The large-scale nature of the sedimentary fluid flow systems that produce these ore deposits suggest it is necessary to understand not only the nature of mineralisation, but also the nature of the basin in which it is hosted. In this study we integrate typical methods of stratigraphic analysis (core and outcrop logging) with recently acquired seismic reflection data and gamma ray logs to ascertain the relationship between the stratigraphic and structural setting of the Ballinalack Zn-Pb deposit and the wider host basin (Dublin Basin).Geometric relationships between layers as revealed by seismic reflection, in conjunction with detailed lithological analysis has shown extensional tectonism was the main driving force of sedimentation in the Dublin Basin. A period of significant extensional tectonism first occurred in the late Tournaisian (Moathill Event, ~348 Ma) and was accompanied by faulting and regional subsidence. This was followed by a period of relative tectonic quiescence, before a second period of tectonism during the lower Visean (Tober Colleen Event, ~345 Ma) resulted in regional subsidence, but without significant faulting. Major subsidence associated with these events produced strong transgressions in the Dublin Basin, interspersed with periods of regression. This view of the tectonic history of the Irish Carboniferous basin contrasts with previous interpretations that suggest the Lower Carboniferous represents an overall deepening sequence. The suggested earlier timing of fault movement has implications for arguments about the origin of Irish-type Zn-Pb deposits and the necessity (or not) for having active faulting during mineralisation. These novel results reveal the value of a combined approach to sedimentary basin analysis.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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".