“…It shares the similar basement and cover sequences to those in other areas of the NCC, including the Archean to early Paleoproterozoic basement rocks and the overlying late Paleoproterozoic to Phanerozoic cover sequences (e.g., Zhang et al, 1985Zhang et al, , 1994Guan et al, 1988;Tu, 1998;Wan et al, 2006;Liu et al, 2009;Diwu et al, 2014;Hu et al, 2014). The oldest basement rocks in this area consist mainly of the Neoarchean-Paleoproterozoic Taihua Complex (2.84-1.97 Ga), which is also defined as Taihua Group composed of a suite of metamorphic rocks including graphitebearing gneisses, greenstones, biotite gneisses, marbles and banded iron formations (e.g., Zhang et al, 1985Zhang et al, , 1994Guan et al, 1988;Tu, 1998;Wan et al, 2006;Diwu et al, 2007Diwu et al, , 2010Diwu et al, , 2013Diwu et al, , 2014Liu et al, 2009;Xu et al, 2009;Huang et al, 2010Huang et al, , 2012Huang et al, , 2013. It is locally unconformably overlain by the Paleoproterozoic Tietonggou Formation in the Xiaoqinling area, which is the boundary region between Shaanxi and Henan provinces.…”