Sedimentology, stratigraphy, geochemistry, geochemistry and diagenesis of giant lacustrine carbonate seep mounds (Ikpiarjuk Formation), Mesoproterozoic Borden Basin, Nunavut, Actic Canada
Bibliographic record
Abstract
The Ikpiarjuk Formation consists of a group of very large (kms long and hundreds of metres \nthick), isolated, deep-water, vent-related dolostone mounds that are unlike any documented \nexample of vent-related carbonate rocks in the geological record. The mounds lack ‘normal’ \nfeatures of Proterozoic carbonates: the mounds contain thrombolites (microbially clotted \ncarbonate), formed below the photic zone, and lack the stromatolitic fabric characteristic of most \nProterozoic reef structures. The sedimentology, stratigraphy, geochemistry, and diagenetic \nhistory of the mounds were investigated through field work, standard petrographic methods, and \nvarious geochemical and other analytical techniques. \nShale-normalised rare earth element patterns of various depositional components of the mounds \ndepicts binary mixing between basin-water-derived precipitates and seep-fluid-derived \ncarbonate. Basin fluid has characteristics that are consistent with deposition in an alkaline lake, \nand seep fluid features are consistent with circum-neutral groundwater that had interacted \nextensively with basement blocks before seeping into the lake bottom through faults. \nThe sedimentology and mineralogy of the mounds indicates that they were formed by \nthrombolites that were made up of a microbiota that was not photosynthetic or aerobic. The \nIkpiarjuk Formation thrombolite microbiota was probably dominated by an anaerobic \nchemoautotrophic or chemoheterotrophic metabolism, and records visible preservation of a \ncommunity that has never before been described from the Mesoproterozoic. \nThe diagenetic history of the Ikpiarjuk Formation is complicated. Dolomitisation occurred early \nduring diagenesis, and subsequently, five different fluids flowed through primary pore space in \nthe mounds and precipitated successive generations of cement. One of the cements contains \nsulphides inclusions and may correlate with base-metal bodies elsewhere in the basin.
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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) | 0.002 | 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".