Late Paleozoic post-collisional magmatism in the Eastern Tianshan Belt, Northwest China: New insights from geochemistry, geochronology and petrology of bimodal volcanic rocks

► A bimodal volcanic event took place in the Early Permian, at around 295 Ma in the Eastern Tianshan Belt. ► The bimodal volcanic series was generated in an initial post-collisional setting. ► Basalts were likely derived from a lithospheric depleted mantle with partial incorporation of crustal components. ► Zircons from rhyolites yield varied εHf(t) values, suggesting a mixing of multiple source materials.