Mineralogy, lithostratigraphy and geochemistry of North Ingebright Lake, Saskatchewan, Canada
Bibliographic record
Abstract
North Ingebright Lake, containing Canada's thickest known Holocene terrestrial salt sequence, is a small (1.25 km2), hypersaline playa basin located in the Great Sand Hills area of southwestern Saskatchewan. Because of its remarkably thick lacustrine sedimentary fill, the basin offers considerable potential for providing a high resolution record of past environmental changes in a region that has few other sources of Holocene paleoenvironmental information. Until recently, efforts to acquire cores of this thick sequence of well-indurated but very soluble salt have been unsuccessful using conventional coring techniques. However, exceptional sediment recovery was achieved using a compressed-air diamond drilling technique that permitted collection of continuous, large-diameter, undisturbed and chemically unaltered cores. The 10,000 year long lacustrine sequence recovered from the basin consists of well-indurated salt, with only minor dispersed mud and organic debris. Indeed, the section is remarkable in its lack of obvious bedding, colour variation or other visible sedimentary structures. The mineral suite of these Holocene salts consists mainly of hydrated Na, Mg, Ca, and Mg+Na sulfates, carbonates, and chlorides. Minor amounts of nitrate evaporitic minerals also occur. This long uninterrupted sequence of soluble salts implies that the lake was characterized by high salinity throughout its Holocene history. However, variations in the mineralogy of the salts suggest that the basin experienced significant changes in brine composition. These evaporites, which allow a detailed reconstruction of specific ion activities and ratios in the brine through time, provide our evidence of the complexity of brine evolution in a closed-basin lacustrine environment in western Canada.
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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) | 0.001 | 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".