The Whale Mountain allochthon: A relic of the Iapetus Ocean preserved in the northeastern Brooks Range of Alaska and Yukon
Bibliographic record
Abstract
ABSTRACT The Whale Mountain allochthon is a structural complex composed of lower Paleozoic mafic volcanic and marine sedimentary rocks that are exposed within three fault-bounded, east–west-trending belts in the northeastern Brooks Range of Alaska and Yukon. Each belt is characterized by a unique structural and stratigraphic architecture. Trace-element systematics from the volcanic rocks define distinctive suites that are geographically restricted to each belt. The volcanic rocks of the southern belt (the Marsh Fork volcanic rocks) have a tholeiitic character and rare earth element trends that resemble modern mid-ocean-ridge basalt. The volcanic rocks of the central belt (the Whale Mountain volcanic rocks) and northern belt (Ekaluakat formation; new name) both have an alkaline character, but the northern belt rocks are significantly more enriched in the incompatible trace elements. New zircon U-Pb data from two volcaniclastic rock units, one from the southern belt and another from central belt, yield unimodal age populations that range from ca. 567 to 474 Ma, with weighted averages of 504 ± 11 and 512 ± 1.4 Ma for each sample. In the central and southern belts of the allochthon, basalt flows are interbedded with discontinuous limestone and dolostone units that contain trilobites and agnostoid arthropods. Three distinct trilobite faunas of late Cambrian (Furongian) age were recovered from widely separated localities. The scarcity of uniquely Laurentian genera, coupled with an abundance of distinctive species that could not be assigned to any established Furongian genus, argues against models that invoke extrusion of these volcanic rocks onto the autochthonous Laurentian shelf or slope. It is thus proposed that the Whale Mountain allochthon formed in a peri-Laurentian setting, possibly as disparate fragments of the northern Iapetus Ocean that were assembled in an ancient accretionary wedge and subsequently accreted to the northern margin of Laurentia during the early Paleozoic.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".