Kimberlites of Camsell Lake field and some features of construction, and composition of lithosphere roots of southeastern part of Slave Craton, Canada
Bibliographic record
Abstract
Since the discovery of the first kimberlite pipe CL-25 within a new kimberlite field situated east of Camsell Lake in 1994 Petrographic and petrochemical characteristics of the CL-25 and CL-174 kimberlites are very close; the distribution patterns of compositions of garnets, magnesian ilmenites, and Cr-spinellide from both pipes are also quite identical. All the characteristics of kimberlites and their mantle-derived minerals reported for the CL-25 Pipe It is made up of typical kimberlite breccia with a high content of xenogenous material represented chiefly by the host granitoids and metamorphic rocks. Petrochemical and petrographical characteristics of the kimberlites from the CL-174 Pipe also permit them to be classified as group I (Skinner, Like the CL-25 Pipe, this pipe is poor in diamonds. The kimberlite rocks found in a system of dikes and in boulder trains near Snap Lake drastically differ from the kimberlites from the CL-25 and CL-174 pipes in petrography, petrochemistry, mineralogy, and in being incomparably richer in diamonds. The kimberlites from the Snap Lake region are established in a series of dikes up to 4 m thick, drilled on the western shore of the lake, in its southern part. Also, they are found in a blind body, resembling a thick (about 100 m) sill, drilled at a depth of 100 m; this body is made up of compositionally complex breccia with an upward variable amount of kimberlite material, reaching the maximum in the lower part of the body. A great deal of kimberlite fragments (hundreds of kilograms) have been established in a boulder train, extended from Snap Lake through a peninsula in the southern part of the lake. The dikes of the western shore are made up of kimberlite rocks with the massive texture of the groundmass and virtually contain no host rock xenoliths; the mantle rock xenoliths are very rare and are represented chiefly by serpentinized granular peridotites. Grains of pyropes, mainly of purple color and up to 3 mm in size, are very scarce. Grains of octahedral chromites up to 1.5 mm in size are also rare. Ilmenites in the rock are not found at all. It was established that the crushed and panned specimen, composed of several ten small fragments of 1.1 kg in total weight, contained 11 grains of pyrope, 16 grains of chromite, and 4 grains of diamond, the largest of which was about 2 mm in size. In composition these rocks belong to the most magnesian varieties of kimberlites and have analogs among the Siberian diamond-rich kimberlites: 31.6 -32.4 wt.% Si02, 0.73 -0.83 wt.% Ti02, 3.18 -3.93 wt.% A1203, 8.61 -9.38 wt.% Fe203, 0.18 -0.23 wt.% MnO, 32.5 -33.7 wt.% MgO, 1.64 -5.39 wt.% CaO, 0.01 -0.15 wt.% Na20, 0.36 -0.58 wt.% K20, 0.50 -0.82 wt.% P205; LOI= 13.2-15.9 wt.%. The pyropes from kimberlites have an unusually wide range of variations in Cr203 contents, up to 17 wt.%, and this distinguishes them from the pyropes from the South-African and Siberian pipes,
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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".