Igneous rocks and hydrothermal alteration of Lower Carboniferous sedimentary rocks, Clarke Head, Minas Fault Zone, western Nova Scotia
Bibliographic record
Abstract
Fault zone megabreccia exposed at Clarke Head, near Parrsboro, Nova Scotia, is a splay of the mid-Carboniferous Minas Fault Zone. Lower Carboniferous sedimentary rocks and Upper Devonian-Lower Carboniferous igneous rocks occur as megablocks within the fault zone. This study investigated: 1) the character of the igneous rocks in the Clarke Head fault zone and (2) the type of hydrothermal veins cutting sedimentary and/or igneous rocks in the fault zone. This information is then used to make comparisons with the evolution of the igneous and hydrothermal systems in the Cobequid fault zone to the north. Igneous rocks comprise gabbro that was intruded by syenite and diorite that either intruded or has xenoliths of grey silty sandstone. The syenite contains magmatic rutile and analcime; magmatic K-feldspar has been largely replaced by scapolite, which shows a temporal transition from more Cl rich to more carbonate rich varieties. The source of the Cl was probably Windsor Group halite. Sedimentary rocks in the fault zone include Lower Horton Group siltstones and sandstones, Windsor Group gypsum and limestones, and grey to reddish clastic rocks that might be either Cheverie Formation or West Bay Formation. All these rocks are cut by Fe-carbonate and (hydr)oxide veins that have younger titania minerals, synchysite, barite, zircon and xenotime. These veins cross-cut older quartz-chlorite-calcite veins, which in turn only in the Lower Horton Group cross-cut albite veins. A similar succession of vein minerals has been described in the literature from the Cobequid Fault to the north. Taken together, the vein systems and the igneous rocks extend knowledge about the igneous and hydrothermal systems along the mineralised Minas Fault Zone and provide opportunities for more precise dating of the complex late Paleozoic tectonic events in the region.
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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".