The Khmilnyk structural and tectonic unit and its geological and geophysical essence
Bibliographic record
Abstract
The Khmilnyk structural and tectonic node is an extraordinary case for the Ukrainian Shield. It is located in its southwestern part (Berdychiv Uplift), at the intersection of three deep faults, and is a clearly manifested deep-penetrating section of the crystalline basement (thermoblast). Its conditional length from west to east is about 40 km, and the epicenter falls on the Khmilnyk gravity minimum with dimensions of 25×25 km and relative intensity of −16 mGal, which coincides with the area of reduced magnetic field intensity. According to a comprehensive geological and geophysical interpretation of these data, the nature of the minimum is due to the manifestation of a local center of Proterozoic acid magmatism among the granitoids of the Berdychiv complex, represented by a mushroom-shaped massif of garnet leucogranites of a biotite composition, traced to a depth of 15 km, i.e., to the zone of existence of a possible granite melt. The mushroom shape of the granitoids, whose density is 0.1 g/cm3 less than that of Berdychiv granites, is explained by subhorizontal penetration of the melt in the near-surface part of the crust in the form of sills. Magmatic activity within the massif and in the area of its endo-exocontacts is accompanied by deep degassing in the form of radon emanations and manifestations of uranium mineralization. The area of the entire Khmilnyk structural and tectonic unit is characterized by numerous manifestations of dike gabbro-diabase Proterozoic magmatism, contrasting halos of indicator minerals of kimberlites and diamond fragments in the sedimentary cover. Detailed petrologic and geochemical characteristics of garnets in general and pyropes in particular are presented. It is shown that the garnets of the study area are of crustal-mantle origin. Some are identical in chemical composition and colorimetric parameters to the garnets of diamond-bearing bimineraleclogites from kimberlites of diamond-bearing provinces of the world. The pyrope is dominated by orange garnets, which indicates a high content of eclogite association varieties. More than a dozen pyrope halos have been identified, lesson smaller than the pyrope halo of the world-famous Snap-Lake deposit (Canadian Shield).
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 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".