Paleozoic mafic-intermediate intrusions (320–287 Ma) in the Kalatongke area, southern Altai, NW China: Products of protracted magmatism in a convergent tectonic setting

•The mafic-intermediate intrusions in the Kalatongke area of the southern Altai Orogenic Belt formed at 287–320Ma.•The protracted magmatism in such a small area (4.5×2km) does not support a mantle plume model.•The magmas before crustal contamination had arc-like trace element and Sr-Nd-Hf isotope characteristics.•Temporal correlation is not an effect tool to determine the size of a mantle plume.