High‐Titanium Zircon Rims in Rhyolite – A Reflection of Adiabatic Ascent?
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Bibliographic record
Abstract
ABSTRACT Autocrystic zircon formed during magma crystallisation provides crucial information for understanding the long‐term evolution of Earth's crust. Due to the factors that control zircon solubility in silicate melt (e.g., temperature and melt composition), zircon crystallisation may occur during magma ascent, emplacement, and eruption. Zircon sourced from volcanic rocks can have rims with elevated concentrations of titanium relative to zircon cores; this has been linked to temperature changes associated with recharge events in magma chambers. An alternative cause of temperature shifts in subvolcanic systems is adiabatic ascent without magma mixing or recharge. Here, we simulate adiabatic ascent of rhyolitic magmas to model the growth and dissolution of zircon during ascent from the mid‐crust to sub‐volcanic depths – decompression melting and system expansion drive cooling prior to fluid saturation. Sub‐volcanic boiling induces magma crystallisation. Zircon growth is predicted throughout ascent for both A‐ and S‐type magmas. Our results suggest that high‐titanium rims of autocrystic zircon can form through the protracted evolution of a single magmatic pulse without the need for magmatic recharge.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.009 | 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 it