The Mengjiatun Formation complex is a suite of supracrustal rocks formed in the early Neoarchean, and its typical rocks include garnet quartzite, biotite-quartz schist and amphibolite.

Based on data obtained in this study and by others, some conclusions can be drawn as follows: (1) The Zhuzhangzi and Dantazi Groups were formed in an arc environment at the end of Neoarchean;