The provenance of heavy minerals in the Mesozoic and Tertiary formations at the Venture B-13 Borehole, offshore Nova Scotia, Canada
Bibliographic record
Abstract
The Venture gas field (Venture B-13 borehole) located ~11.3 km east of Sable Island (4402’11.61’’N, 59 32’03.54’’W) which was discovered in 1979, occupies the central part of the Sable delta complex (Figure1). It was drilled to a depth of 5368m to Mic Mac Formation and cored between 4692.7 mand 4734.4 m(Missisauga Formation) and 4949.0 m and 4967.30 m (Mic Mac Formation). Reservoir sediments are alternating sandstoneshale as part of Missisauga formation (Early Cretaceous) and Mic Mac Formation (Late Jurassic) (CNSOPB, 2000). These sediments were deposited under episodic deltaic, fluvio-shallow-marine environments. The composition of sandstones reflects the character of sedimentary provenance and the nature of sedimentary processes within the depositional basin. Provenance and depositional basin are governed by the tectonic regimes, which in turn control the distribution of types of sandstones. Many studies have correlated the composition of sandstones, their provenances, and tectonic settings (Dickinson and Suczek, 1979). In recent years additional tools have added more value to the provenance studies of these minerals. One such tool is determining the mineral chemistry of heavy minerals using electron microprobe analysis. Among the minerals used for such study by different authors are garnet (Sabeen et al., 2002; Morton and Hallsworth, 1999), tourmaline (Henry and Guidotti, 1985), zircon, rutile, amphibole, pyroxene, epidote and ilmenite. Heavy minerals proven to be most useful for provenance study are garnet and tourmaline because of their mineralogical and chemical diversity, abundance in sediments and rocks of different origin, and physicalchemical resistance and stability under various extreme geological conditions. Both, garnet and tourmaline were used as provenance indicators in this study.
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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 | 0.000 | 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".