GEOQUÍMICA E GEOCRONOLOGIA DE TRÊS PLÚTONS DO URUGUAI CENTRAL: IMPLICAÇÕES TECTÔNICAS PARA A OROGÊNESE TRANSAMAZÔNICA
Bibliographic record
Abstract
The Arroyo Grande Belt is the smallest of the three metamorphic belts recognized in south-central Uruguay and is located along the northern margin of the Piedra Aha Terrane. The belt is host to a number of granitic intrusions, three of which (the Marincho Complex, the Arroyo Grande Pluton and the South Granite) are discussed in this report. The three intrusions vary in composition from homblendite to leucogranite and have themselves been intruded by a number of dykes, also of variable composition. The Arroyo Grande Pluton formed in an extensional environment whereas the main portion of the Marincho Complex formed in a compressional tectonic regime. The main unit of the Marincho Complex has been dated at 2,291 ± 65 Ma whereas a leucogranite member of the mass has been dated at 2,067 ± 24 Ma, thereby demonstrating that the Marincho Complex is a composite mass. A leucogranitic dyke, intrusive into the Marincho Complex, yields an age of 1,969 ± 25 Ma. The leucogranitic South Granite has been dated at 2,180 ± 50 Ma. The Arroyo Grande Pluton has not been dated. The available data indicate three periods of emplacement of granitic plutons in southern and central Uruguay: 1. Archean, involving greenschist facies metamorphism; 2.2,290 Ma - 2,180 Ma.- the time of emplacement of massive granitoids; 3. 2,040 Ma -1,894 Ma. - emplacement of predominantly small granitic dykes.
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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 | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.004 | 0.001 |
| Open science | 0.008 | 0.002 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.001 | 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; both teacher heads agree on what is shown here.
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".