Metamorphic Evolution of the Archean Supracrustal Rocks from the Qingyuan Area of the Northern Liaoning Terrane, North China Craton: Constrained Using Phase Equilibrium Modeling and Monazite Dating

Archean supracrustal rocks from the Qingyuan area of northern Liaoning terrane, North China Craton, occur as enclaves or rafts various scales within tonalite–trondhjemite–granodiorite (TTG) domes. They were normally subjected to metamorphism at amphibolite facies with locally granulite facies. We collected biotite two-feldspar gneiss Hongtoushan and conducted petrography, mineral chemistry, phase equilibrium modeling monazite dating reveal its metamorphic evolution. The peak condition was constrained be 750–775 °C ~7 kbar based on stability inferred assemblage compositions including pyrite grossular contents in garnet core, XMg biotite. final ~700 ~6 solidus presence muscovite assemblage. post-peak near-isobaric cooling process consistent core?rim decreasing content garnet. Monazite yielded a age ~2.50 Ga for sample, coeval magmatism TTGs terrane. By combining other geological features, we suggest vertical sagduction responsible evolution area. This may correlated mantle plume.