Mineral Chemistry and Petrochemistry of Post-Collisional Tertiary Mafic to Felsic Cogenetic Volcanics in the Ulubey (Ordu) Area, Eastern Pontides, NE Turkey
Bibliographic record
Abstract
Post-collisional Tertiary volcanic rocks in the Ulubey (Ordu) area at the western edge of the eastern Pontides palaeo-arc are divided into four suites. The Yenisayaca basalt (TB) contains plagioclase (An_{61-83}), clinopyroxene (Wo_{42-44}En_{39-41}Fs_{15-18}) and olivine phenocrysts and titanomagnetite microphenocrysts, whereas the Çatal Tepe and Elekçioğlu Tepe suite (ÇES), Işık Tepe suite (ITS) and andesite/ trachyandesite suite (ATS) rocks include plagioclase (An_{23-78}), clinopyroxene (Wo_{27-48}En_{37-55}Fs_{11-26}), hornblende (Mg#= 0.63-0.76), biotite (Mg#= 0.63-0.82), sanidine phenocrysts and titanomagnetite and apatite microphenocrysts. Petrochemically, the volcanic rocks show tholeiitic-alkaline to the calc-alkaline affinities, and have medium to high-K contents. Most samples have low Mg#, Cr, and Ni, which indicates that they have undergone significant fractional crystallization from mantle-derived melts. The geochemical variations can be explained by fractionation of common mineral phases such as clinopyroxene ± plagioclase ± magnetite in the Yenisayaca basalt, and hornblende + biotite + plagioclase ± magnetite ± apatite ± sanidine in the Çatal Tepe and Elekçioğlu Tepe suite, Işık Tepe suite and andesite/trachyandesite suite rocks. N-Type MORB-normalized trace element patterns show that Ulubey volcanic rocks are enriched in LILE and to a lesser extent in Th and Ce, but depleted in Zr, Y and TiO_2. Besides, the rocks have depletion in Nb and Ta relative to LILE, moderate LREE/HREE ratios and high Th/Yb ratios, all of which indicate that parental magma(s) probably derived from an enriched source region (probably lithospheric mantle) which was previously modified by fluids. The C1-chondrite-normalized REE patterns are concave with low to medium enrichment, indicating similar source areas for the Yenisayaca Basalt, Çatal Tepe and Elekçioğlu Tepe suite, Işık Tepe suite and andesite/trachyandesite suite. The REE patterns also imply that negative Eu anomalies are probably associated with plagioclase fractionation in the evolution of the rocks.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".