Stratigraphy of the western Lake St. Joseph greenstone terrain, Northwestern Ontario / by Ben R. Berger. --
Bibliographic record
Abstract
The western Lake St. Joseph area in Northwestern Ontario is underlain \nby Archean metavolcanic and metasedimentary rocks. The strata, \nreferred to as the Lake St. Joseph Group comprise three formations \nrepresentative of mafic to felsic volcanic cyclicity. The Blackstone \nFormation, stratigraphically the lowest, contains a lower member composed \nof predominantly high-Mg, low-K tholeiitic pillowed basalts and an upper \nmember composed of rhyoliticflows and pyroclastic rocks. The overlying \nWestern Lake St. Joseph Formation contains a lower member composed \nof predominantly calc-alkaline massive and pillowed basalts and an \nupper member composed of dacitic pyroclastic and epiclastic rocks. The \noverlying Carling Formation contains a volcanic member and a sedimentary \nmember. The volcanic member is composed predominantly of high-Fe, \nlow-K tholeiitic pillow breccias and dacitic to rhyolitic epiclastic and pyroclastic rocks. The sedimentary member consists of basal greywacke \nturbidites and laminated iron formation of economic potential overlain \nby chloritic classical turbidites. These sedimentary rocks are overlain \nby massive and cross-bedded arkosic greywackes which are in turn \noverlain by conglomerate and pebbly sandstone. \nThe deformation of the rocks is expressed by isoclinal folding, most \nevident on Eagle Island, and development of the regional Lake St. \nJoseph Fault. Contact and regional metamorphism (lower to middle greenschist facies) have also affected the rocks. \nThe primary structures, vertical and lateral variations in the felsic \nvolcanic rocks of the Blackstone and Western Lake St. Joseph Formations \nindicate deposition on a subaqueous paleoslope. Similarly the felsic volcanic rocks of the Carling Formation indicate subaqueous deposition \non a different paleoslope. \nThe lithologies, primary structures, vertical and lateral variations \nof the units in the sedimentary member of the Carling Formation indicate \ndeposition on a prograding submarine fan. Meyn and Palonen (1980) \nsupport this interpretation. \nReconstruction of the paleoenvironment envisages three stages of \nevolution. In stage 1 the Blackstone and Western Lake St. Joseph Formations are extruded and deposited on the flank of a volcanic edifice. \nIn stage 2 the volcanic member of the Carling Formation is extruded \nfrom a separate vent and in part deposited upon the degradation products \nof stage 1. In stage 3 laminated iron formation is deposited with clastic \nsediments in a submarine fan-basin plain system to form the sedimentary \nmember of the Carling Formation.
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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 | 0.002 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.075 | 0.014 |
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".