The paleoposition of the Antimonio depositional system (Sonora, Mexico): New insights from nonparametric and multivariate analysis of detrital zircon data
Bibliographic record
Abstract
The Antimonio depositional system ranges from the Upper Permian to the uppermost Lower Jurassic. It is the only locality of Upper Triassic shallow marine carbonates in Mexico and through its speculative basement; it provides a potential link between the terrane framework of Mexico and the North American Cordillera. Various paleotectonic models have been proposed to explain the mixed siliciclastic-carbonate successions of the Antimonio depositional system in Sonora, Mexico, including interpreting it as a distinct allochthonous terrane or having a position close to the Laurentian basement. Microfacies, paleontological and paleomagnetic studies have suggested a paleogeographic position in low latitudes close to Laurentia. However, the basement structures of the Antimonio depositional system are poorly known and have numerous uncertainties. Here, we use detrital zircon geochronology to identify the sources of terrestrial sediments of the Antimonio depositional system and to propose potential sedimentary distribution patterns. The results allow us to clarify its paleotectonic position and consolidate the geodynamic model of González-León et al. (2005), in which the Antimonio depositional system was attached to the Caborca block. Four major zircon age distributions of detrital zircon were determined in the Barra los Tanques and Sierra del Álamo sections of the Rio Asunción Formation (Antimonio depositional system: (1) a Permo-Triassic group (207–292 Ma); (2) the group/population of 1.0–1.2 Ga; (3) a group clustering between 1.3 and 1.5 Ga and (4) the group of 1.6–1.8 Ga. This new data set was compared with published detrital zircon data from localities along the North American Cordillera, using two-sample Kolmogorov-Smirnov tests and hierarchical clustering. The results allow us to identify potential sources located in the Cordilleran continental arc and the ancestral Rocky Mountains, as well as in sediments and volcanic deposits of their respective surrounding areas. We suggest that the transport for these sediments was likely provided through the Chinle river system, and long-shore oceanic currents. Combining published data from Magsat magnetic anomalies with stratigraphy based paleontology, and our new geochronological data analysis, we suggest that the Antimonio depositional system must have been part of Laurentia and potentially linked to the Caborca block during the Late Triassic.
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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 | 0.004 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 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".