STRATIGRAPHIC IMPLICATIONS FOR MINERALIZATION: PRELIMINARY FINDINGS OF A METALLOGENIC INVESTIGATION OF THE TALLY POND VOLCANICS, CENTRAL NEWFOUNDLAND
Bibliographic record
Abstract
Preliminary investigation of volcanogenic massive sulphide occurrences within the Tally Pond volcanics, suggests mineralization is intimately associated with a sequence of quartz-phyric , high-silica rhyolite flows and epiclastic sedimentary rocks. These mineralized rocks are hosted within a bimodal volcanic pile, where correlation as a single magmatic event cannot be confirmed but the available age-date determinations suggests the correlation of at least one widespread mineralizing event. This is demonstrated by identical U–Pb (zircon) dates (513 ± 2 Ma) obtained by previous workers, from similar quartzphyric volcanic rocks from the Duck Pond–Boundary deposit area and the Lemarchant prospect. Based mainly on observations of drill core from the Duck Pond and Boundary deposits, the internal stratigraphy of the Tally Pond volcanics appears to attest to a prolonged period of mafic volcanism, punctuated by several felsic volcanic episodes. The oldest felsic volcanic event is recorded as a thick sequence of flow-dominated aphyric to feldspar-phyric dacitic to rhyolitic volcanic rocks having textures indicative of a lobe-hyaloclastite flow volcanic regime. This sequence is con formably overlain and possibly locally intercalated, with an apparently less voluminous sequence of high-silica, quartzphyric, rhyolite and epiclastic turbidites that host, and is chronologically and perhaps genetically, linked with volcanogenic massive sulphide mineralization. Based on a review of available geochemical, geochronological and isotopic data, the Tally Pond volcanics are interpreted to have formed in an ensimatic-arc environment, as originally proposed by previous workers. However, it is further pro posed that this arc formed adjacent to the Gondwanan continental margin as evidenced by characteristic highly radiogenic Pb-isotopic signatures, observed from massive sulphides within the Tally Pond volcanics and the Victoria Lake supergroup. Tectono-magmatic models, proposed for pre- and post-Arenig volcanic rocks of similar tectonic affinities, within the Wild Bight and Exploits groups elsewhere in the Exploits Subzone, may apply to arc-related volcanic rocks of the Victoria Lake supergroup, including the Tally Pond volcanics, suggesting further links between these two metallogenically important areas.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 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".