Sedimentary architecture of the ediacaran mixed carbonate-siliciclastic system, NW arabian plate: Regionally extensive marine incursion or syntectonic fault-controlled basin?
Bibliographic record
Abstract
Ediacaran sedimentary successions worldwide are commonly characterized by mixed siliciclastic-carbonate deposits exhibiting contemporaneous deposition. In NW parts of the Arabian plate, a similar style of sedimentation is observed within a series of isolated basins along the NW-trending Najd Fault System. Two contrasting depositional models have been proposed to explain the formation of Km-thick Ediacaran sedimentary sequences in the region, from regionally extensive marine platform to fault-controlled basins with syntectonic deposition. To date, this question remains unanswered and the controlling factors governing the mode of formation, the evolution and the sedimentary architecture for these Ediacaran sequences remain enigmatic. In this study, we explore this mixed siliciclastic and carbonate sedimentation by conducting detailed sedimentology and stratigraphic analysis of the Ediacaran Dhaiqa basin, a transtensional basin formed along the Najd Fault system of western Saudi Arabia. Eight sedimentary facies are identified, ranging from polymict conglomerate to microbial carbonate which most likely represent accumulation in continental (alluvial to lacustrine) to marginal marine settings. In addition to sedimentological evidences for syn -sedimentary tectonic activity, we observed four 3rd-order fining- and deepening-upwards sequences, which may suggest multi-stage, fault-controlled sedimentation related to local tectonic activity in the Dhaiqa basin. Variations in sequence arrangement and thickness further indicate discrete fluctuations in the development of local accommodation space in the basin. These findings highlight how the style of sedimentation in the Ediacaran basins of the Arabian-Nubian Shield may be primarily controlled by local fault-related accommodation, which might differ from many Ediacaran successions that record relative and eustatic base level changes, but is similar to the basins formed in the regions influenced by tectonism. Such information provides a better framework to compare Ediacaran rocks across multiple isolated basins spread across the northwestern regions of the Arabian-Nubian Shield, and may provide base for the future correlations of these sequences with mixed siliciclastic carbonate successions in similar syn -tectonic basins worldwide.
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 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 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".