Subduction-induced mantle heterogeneity beneath Eastern Tianshan and Beishan: Insights from Nd-Sr-Hf-O isotopic mapping of Late Paleozoic mafic-ultramafic complexes

► Systematic Nd-Sr-Hf-O isotopic mapping of the mafic-ultramafic complexes from the southern CAOB. ► Compositional heterogeneity of mantle sources beneath Eastern Tianshan and Beishan. ► Two subduction-related modifications from South Tianshan Ocean and subsequent Junggar Ocean induced mantle heterogeneity. ► The generation of mafic-ultramafic intrusions related to post-orogenic extension and ~ 280 Ma mantle plume.