Compositional variation of siderite and its significance in deciphering the diagenetic evolution of the Lower Cretaceous sedimentary system of the Scotian Basin
Bibliographic record
Abstract
Diagenetic siderite is widespread in the Scotian Basin with age ranging from sea-floor diagenetic to among of the last diagenetic products. Through the use of minor element chemistry five types of siderite have been identified. The relative ages of these five types of siderite have been established using their textural relationships in back-scattered electron (BSE) images, and through the use of petrographic microscopy. The studied siderites show extensive substitution of Mn and Mg and to a lesser extent of Ca for Fe, with the substitution of Mn for Fe being the most common in certain wells. Factors that may influence the chemistry of the diagenetic siderite include: chemistry of the circulating fluids, lithofacies, pre-existing detrital and diagenetic minerals, and availability of permeability. All these factors seem to have played a role in the chemistry of the studied siderites. The two competing mechanisms to produce the observed siderite chemical variability are regional basin hydrology and bio-mineralisation. Recrystallisation and re-precipitation of siderite are ubiquitous in most studied samples. They seem to be closely related with various dissolution events, syn-sedimentary deformation, and late regional salt tectonics. Of the dissolution events, late dissolution is especially enhanced in certain samples, and suggests the presence of very corrosive pore fluids. The best explanation for our data sets is the involvement of a variety of hydrogeological events. Factors that might have influenced the onset of these events include: regional tectonics, and in particular salt tectonics, transport of hydrocarbons, and overpressure, in addition to sea-level changes. Chemical evidence from siderite and associated minerals suggests that the circulating fluids that have influenced the precipitation of particular types of siderite must have changed drastically through time both in their chemistry and their temperature.
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 | 0.000 | 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) | 0.001 | 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".