Three Paleoproterozoic magmatic episodes at ca. 2.33 Ga, ca. 2.17 Ga and ca. 2.05 Ga
Two stages of metamorphism at 1.95–1.90 Ga and ca. 1.85 Ga
3.0–2.7 Ga and ca. 2.5 Ga crustal growth events
The Alxa Block is an integrated part of the NCC from Neoarchean to Paleoproterozoic.