Lithogeochemistry and hydrothermal alteration of the Halfmile Lake South Deep Zone: a volcanic hosted massive sulphide deposit, Bathurst Mining Camp, New Brunswick
Bibliographic record
Abstract
The Halfmile Lake South Deep zone (HMLSDZ), Bathurst Mining Camp, New Brunswick, was discovered by Noranda Inc (Exploration) as a result of a 3-D seismic survey. Mineralization consists of Pb-Zn-Cu and hosted by an overturned Lower Tetagouche Group volcano-sedimentary package. Epiclastic rocks are interbedded with subordinate fine-grained felsic pyroclastic rocks that dominate the structural hangingwall. Locally crystal rich felsic tuffs and subordinate epiclastic rocks comprise the immediate structural footwall. This sequence was intruded by quartz-feldspar porphyritic intrusions and cut by intermediate to basaltic dykes. The host rocks to the deposit have suffered sub-greenschist facies metamorphism, polyphase deformation, and are variably hydrothermally altered. The host rocks can be geochemically discriminated using trace element ratios such as Zr/TiO2, Nb/TiO2, 'etc'. These ratios indicate that four volcanic compositions existence at the HMLSDZ: rhyolite, dacite, andesite, and basalt. The aphyric and feldspar quartz phyric volcanic rocks are rhyolitic and dacitic in composition whereas the epiclastic rocks are predominantly dacitic. Pearce element ratio (PER) diagrams, molar element ratio (MER) diagrams, and petrographic examination demonstrate that hydrothermal activity involved muscovite, chlorite, and minor carbonate formation. A lateral and vertical zone (200-300 m) of intense alteration is developed in the immediate structural hangingwall to the HMLSDZ. This alteration halo is characterized by additions of Fe, H and variable K, and losses of Na and minor Ca, due to hydrothermal activity. Results from this study demonstrate that metamorphism and deformation have not significantly obscured hydrothermal alteration signatures.
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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".