“…The 900-870 Ma Gubaoquan granitoid gneisses possessing T C DM ages of 1.85-1.44 Ga, can serve as old crustal source material for these Phanerozoic igneous rocks (Fig. 12b), while the involvement of mantle-derived juvenile material is inevitable based on as young as Cambrian model ages and strongly positive ε Hf (t) values of zircons from some Phanerozoic igneous rocks (Feng et al, 2012;Li et al, 2012Li et al, , 2013Mao et al, 2012a;Zhang et al, 2010bZhang et al, , 2011Zhang et al, , 2012b (Wright, 1969); (b) A/CNK-A/NK diagram (Maniar and Piccoli, 1989); c) FeO t /(FeO t + MgO)-SiO2 diagram (after Frost et al, 2001Frost et al, ). et al, 2009Liu et al, 2010;Song et al, 2013a,b;Tian et al, 2013Tian et al, , 2014.…”