THE KATIE PROSPECT AND THE POTENTIAL FOR VOLCANOGENIC MASSIVE SULPHIDES IN THE BAIE D'ESPOIR GROUP, SOUTH-CENTRAL NEWFOUNDLAND: A METALLOGENIC AND LITHOGEOCHEMICAL STUDY
Bibliographic record
Abstract
The Huxter Pond volcanic belt is a felsic to intermediate volcanic sequence, seemingly formed in an island-arc-type setting, which may be a favourable environment for the deposition of volcanogenic massive sulphides. Regionally, the Huxter Pond volcanics are situated in the Exploits Subzone of the Dunnage Tectonostratigraphic Zone, and apparently represent the easternmost example of arc volcanism in the subzone. Locally, these rocks belong to the Middle Ordovician North Steady Pond Formation of the Baie d'Espoir Group, which comprises repetitive sequences of volcanogenic arkose, argillite, conglomerate, and transitional to calc-alkaline volcanic rocks consisting mainly of intermediate to felsic tuff. Volcanic rocks in the western Exploits Subzone of the Dunnage Zone, such as those in the Tulks Hill and Tally Pond volcanic belts, are recognized as hosts to significant VMS depositional environments and are similar in age and lithology to the Huxter Pond volcanic belt. Rock types and sulphide mineralization at the Strickland VMS deposit in the Hermitage Flexure of the southwestern Exploits Subzone also resemble those in the Huxter Pond volcanics, particularly in the vicinity of the Katie Prospect. The Strickland deposit is predominantly zinc rich and hosted by Ordovician felsic volcanic rocks interpreted to have erupted near the Gondwanan continental margin. This study was designed to determine if the Huxter Pond volcanics are genetically related to volcanism in the western half of the Exploits Subzone and their potential for base-metal enrichments. Geochemical data define the presence of two different igneous suites in the vicinity of the Katie Prospect, viz.; a calcalkaline rhyodacite to dacite suite (the so-called normal felsic volcanic suite) and a tholeiitic to transitional high-level granite–granite breccia–tuff suite. The granite–granite breccia–tuff suite itself appears to be at least, in part, bimodal, being further subdivided into andesite and rhyodacite groups. Sulphide-enriched samples are solely felsic volcanic and exhibit significantly different geochemical signatures than the normal suite including the immobile elements. Lead isotope data for a galena separate from the Katie Prospect resemble those for galenas from Victoria Mine, Tulks and Tulks Hill deposits of the Victoria Lake supergroup. Recognizing and documenting the metallogenic potential of the Huxter Pond volcanics with respect to other deposits in the Exploits Subzone, and to the overall geological development of the Iapetus Ocean may be of considerable importance for understanding the metallogenic development of the entire volcanogenic massive sulphide district in central Newfoundland.
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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 | 0.001 |
| 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".