Timing of partial melting and granulite formation during the genesis of high to ultra‐high temperature terranes: insight from numerical experiments.

Long-lived high to ultra-high temperature (HT-UHT) granulitic terranes formed throughout Earth's history. Yet, the detailed processes involved in their formation remain unresolved and notably sequence of appearance duration migmatisation granulites conditions orogenic cycle. These can be evaluated by analytical numerical models. First, solving steady-state heat equation allows underlining interdependency parameters controlling crustal geotherm at thermal equilibrium. Second, performing two-dimensional thermo-mechanical experiments an cycle, from shortening gravitational collapse, consider non-steady-state geotherms understand how deformation velocity may affect relative timing migmatite granulite formation. with elevated radiogenic production slow rates allow large volumes prograde migmatites going through sillimanite field as observed many HT-UHT terranes. Finally, interplay between these explain difference predicted pressure-temperature-time paths that compared natural rock archive.