Petrogenesis of the late <scp>C</scp>retaceous <scp>K</scp>‐rich volcanic rocks from the <scp>C</scp>entral <scp>P</scp>ontide orogenic belt, <scp>N</scp>orth <scp>T</scp>urkey
Bibliographic record
Abstract
Abstract Subduction‐related volcanic rocks are widespread in the C entral P ontides of T urkey, and represented by the H amsaros volcanic succession in the S inop area to the north. The volcanic rocks display high‐ K calc‐alkaline, shoshonitic and ultra‐ K affinities. 40 A r/ 39 A r age data indicate that the rocks occurred during the L ate C retaceous ( ca 82 Ma), and the volcanic suites were coeval. Primitive mantle‐normalized trace element patterns of all the lavas are characterized by strong enrichments in large ion lithophile elements ( LILE ) ( Rb , Ba , K , and Sr ), Th , U , Pb , and light rare earth elements ( LREE ; La , Ce ) and prominent negative Nb , Ta , and Ti anomalies, all typical of subduction‐related lavas. There is a systematic increase in the enrichment of incompatible trace elements from the high‐ K calc‐alkaline lavas through the shoshonitic to the ultra‐ K lavas. In addition, the shoshonitic and ultra‐ K lavas have significantly higher 87 S r/ 86 S r (0.70666–0.70834) and lower 143 N d/ 144 N d (0.51227–0.51236) initial ratios than coexisting high‐ K calc‐alkaline lavas ( 87 S r/ 86 S r 0.70576–0.70613, 143 N d/ 144 N d 0.51245–0.51253). Geochemical and isotopic data show that the shoshonitic and ultra‐ K rocks cannot be derived from the high‐ K calc‐alkaline suite by any shallow level differentiation process, and point to a derivation from distinct mantle sources. The shoshonitic and ultra‐ K rocks were derived from metasomatic veins related to melting of recycled subducted sediments, but the high‐ K calc‐alkaline rocks from a lithospheric source metasomatized by fluids from subduction zone.
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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 | 0.017 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.004 | 0.003 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.006 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.001 | 0.003 |
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".