RECONSTRUCTION OF MAGMATIC TO SUBSOLIDUS PROCESSES IN AN AGPAITIC SYSTEM USING EUDIALYTE TEXTURES AND COMPOSITION: A CASE STUDY FROM TAMAZEGHT, MOROCCO
Bibliographic record
Abstract
The Eocene Tamazeght (or Tamazert) complex, situated in the High Atlas Mountains of Morocco, comprises a suite of ultramafic to syenitic alkaline to peralkaline units cross-cut by carbonatite diatremes, and dyke rocks of both carbonatite and silicate lithology. In spatially restricted areas, the most evolved silicate unit of the complex (malignites) contains eudialyte-group minerals (EGM) as index phases for agpaitic systems. The chemical composition of EGM is closely related to their textural position; the EGM are stable over a wide range of temperature and chemical composition and readapt their composition to changing subsolidus conditions, including infiltration of external fluids. Therefore, EGM are a powerful petrogenetic indicator in agpaitic systems. Petrography and compositions of EGM record all stages of the (late-) magmatic to subsolidus history including (1) effects of an autometasomatic fluid, (2) infiltration of a fluid derived from associated carbonatites, and (3) opening of the system to meteoric fluids. During the late-magmatic stage 1, the crystallization of interstitial EGM is accompanied by intensive albitization of surrounding feldspars. The replacement of nepheline by sodalite occurs at the postmagmatic stage 2, when primary sector-zoned EGM are cross-cut by irregular bright zones in BSE image that are enriched in Sr, Mn, rare-earth elements (REE) and high field-strength elements (HFSE). Enrichment of these elements in distinct schlieren-like zones in EGM combined with the formation of Ca- and CO2-rich minerals of the cancrinite group points to the associated carbonatites as the potential source of fluid. The latest modifications (3) include the formation of zeolite-group minerals and calcite, which are believed to be a result of the interaction of the rocks with low-temperature meteoric fluids, probably in equilibrium with the surrounding country-rocks.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.000 | 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".