Microssonda eletrônica de elétrons U-Th-Pb e La-ICP-MS U-Pb datando de múltiplos eventos hidrotermais e metamórficos registrados em minerais de as albitites uraníferas da Lagoa Real (Brasil
Bibliographic record
Abstract
Os albititos uraníferos de Lagoa Real são rochas que passaram por várias modificações após a formação. A datação química U-Th-Pb por microssonda eletrônica e datação U-Pb por LAICP-MS dos minerais dos albititos revelaram cristalização e metamorfismo isoquímico do protólito (sienitos sódicos portadores de U) em cerca de 2,0-1,9 Ga durante as fases finais do evento orogênico Orosiriano, quando a primeira geração de uraninitas foi formada. Mobilizações múltiplas de urânio e chumbo promovidas por pelo menos cinco eventos hidrotermais (1,7 Ga, 1,5 Ga, 1,3 Ga, 1,1 Ga e 1,0 Ga) foram detectadas nos albititos. A provável formação de um segundo grupo de uraninitas e/ou o reajuste do relógio U-Pb das uraninitas mais antigas durante o evento orogênico Brasiliano (0,5 Ga) também ocorreram.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".