Geochronology of multi-stage metamorphic events: Constraints on episodic zircon growth from the UHP eclogite in the South Altyn, NW China

Petrography, mineral chemistry and pressure–temperature (P–T) estimates were carried out for the eclogite from the South Altyn in NW China. The results suggest three stages of metamorphism: an ultra-high pressure (UHP) eclogite-facies metamorphism at 717–871 °C and ≥ 2.8 GPa, a high pressure (HP) granulite-facies metamorphism at 624–789 °C and 1.42–1.52 GPa, and an amphibolite-facies metamorphism at 597–728 °C and 0.99–1.17 GPa....