Abstract: Magmatic sulphide mineralization in the Pants Lake Intrusion, Labrador: implications for geological exploration models for Voisey’s Bay-style deposits
Bibliographic record
Abstract
The ca. 1322 Ma Pants Lake Intrusion (PLI) comprises PLI intrusions, and is invariably associated with distinctive, several mafic intrusions emplaced into sulphide-bearing contaminated, sulphide-bearing mafic rocks that include metasedimentary gneisses, about I 00 km south of the textural equivalents of the 'basal breccias' and 'leopard world-class Voisey's Bay Ni--Cu--Co deposit. The PLI troctolites' described from Voisey's Bay. There is strong provides the closest analogue to the Voisey's Bay host rocks evidence for assimilation of local metasedimentary gneisses, recognized to date in Labrador, and contains widespread which may have provided an external source for much of the disseminated, and, more rarely, massive magmatic sulphide sulphur. The PLI mineralized sequences record the mineralization. The area presents an opportunity to test and introduction of discrete sulphideand fragment-bearing further develop geological exploration models based upon the magma pulses into evolving, dynamic, mafic magma Voisey's Bay deposits. Many critical processes seen (and chambers, as suggested for the Voisey's Bay deposit. inferred) in the Voisey's Bay area apparently also operated However, the PLI mineralized sequences appear to be during the emplacement of the PL!. However, there are also intrusion-wide 'stratigraphic' features, and discrete important differences between the two areas and their mineralized feeder conduits, as documented at Voisey's Bay, evolution may not be strictly parallel. have not yet been located. Ni contents at I 00% sulphide are The PU is dominated by several different varieties of mostly lower than at Voisey's Bay, but the sulphides contain olivine~gabbro. The component intrusions are sheet-like, and higher Cu and Co at a given Ni content, and consistent Ni/Cu range from <50 m to over 600 m in thickness. Their presently and Ni/Co ratios suggest a large-scale magmatic process. complex geometry probably reflects the superposition of There is evidence for the extraction of large quantities of Ni regional tilting and/or gentle folding on primary variations in and Cu from these magmas by sulphide liquids. The challenge their thickness and anatomy. Magmatic sulphide for future exploration in this area is to find out where it went! mineralization is ubiquitous near the basal contacts of most
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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 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".