Petrology, geothermobarometry, and phase equilibrium modelling of garnetiferous felsic gneiss from Grovnes peninsula in the Larsemann Hills of Prydz Bay, East Antarctica provide pristine evidence for the preservation of high-grade metamorphic imprint in the area. The metamorphic evolution of the sample is demonstrated by the development of the assemblage Grt+Bt+Melt+Pl+Sill+Kfs+Qtz+Ilm at peak metamorphic conditions of ∼790 °C and ∼7.5 kbar, which subsequently underwent retrogression and cooling to lower P-T conditions along a clockwise path. Texturally constrained chemical dating of monazites constrain the timing of peak metamorphism and garnet formation at ∼575 Ma, whereas the apatite U–Pb ages constrain cooling ages at ∼518 Ma. The clockwise P˗T˗t trajectory of the studied samples, together with the Ediacaran-Cambrian metamorphic/cooling ages demonstrate the long-lived nature of metamorphism in Prydz Bay, which is ascribed to collisional tectonism prevalent during the final stages of the assembly of East Gondwana supercontinent. Similar results from adjacent continental fragments including Sri Lanka, Eastern Ghats Belt, Madagascar, and South India suggest their coeval metamorphic evolution during the East African orogeny.

南极洲东部普里兹湾拉瑟曼山格罗夫内斯半岛的石榴石长英质片麻岩的岩石学、地温气压测量和相平衡模型为该地区高级变质印记的保存提供了原始证据。样品的变质演化通过组合 Grt+Bt+Melt+Pl+Sill+Kfs+Qtz+Ilm 在~790 °C 和~7.5 kbar 的峰值变质条件下的发展得到证明，随后经历了退化和冷却至沿顺时针路径降低 PT 条件。独居石的结构约束化学测年将变质峰和石榴石形成的时间限制在~575 Ma，而磷灰石U -Pb年龄将冷却年龄限制在~518 Ma。研究样本的顺时针 P˗T˗t 轨迹以及埃迪卡拉纪-寒武纪变质/冷却年龄证明了普里兹湾变质作用的长期性质，这归因于在组装的最后阶段普遍存在的碰撞构造作用。东冈瓦纳超大陆。斯里兰卡、东高止山脉、马达加斯加和南印度等邻近大陆碎片的类似结果表明，它们在东非造山运动期间经历了同时代的变质演化。