Fig.1 Tectonic map of the Qinling Orogen (a) and geological sketch map of the Yangxie-Fengbeihe area (b)((a) modified after refs.[33-34]; (b)modified after ref.[35])

Fig.2 Geological map of the Dashegou tungsten deposit

Fig.3 Photos showing typical orebodies and ore hand-specimen of the Dashegou tungsten deposit

Fig.4 Hand-specimen photo (a) and microscopic photos (b-d) of the porphyroblastic augen plagiogneiss

Fig.5 Representative zircon CL images of the porphyroblastic augen plagiogneiss

Fig. 6 Chondrite-normalized REE patterns (a), U-Pb concordia diagram (b), and petrological discrimination diagrams of trace elements (c), (d) of zircons from the porphyroblastic augen plagiogneiss (base map after ref. [42])

Fig.7 Protolith discrimination and classification plots for the porphyroblastic augen plagiogneiss

Fig.8 SiO2-K2O (a)and A/CNK-A/NK (b) discrimination diagrams for the porphyroblastic augen plagiogneiss (base map after refs. [48] and [49], respectively)

Fig.9 Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagrams (b) for the porphyroblastic augen plagiogneiss (normalized data after ref. [52])

Fig.10 Granite discrimination diagrams for the porphyroblastic augen plagiogneiss ((a)(b) base map after ref.[57]; (c) base map after ref.[56])

Fig.11 Adakite discrimination diagrams of Y-Sr/Y (a) and YbN -(La/Yb)N (b) for the porphyroblastic augen plagiogneiss (base map after refs.[64, 68-69])

Fig.12 Discrimination diagrams of SiO2-Mg# (a) and C/MF-A/MF (b) for the porphyroblastic augen plagiogneiss in the Dashegou tungsten orefield (base map after refs.[83] and [84], respectively)

Fig.13 Discrimination diagrams of Y-Nb (a) and (Y+Ta)-Rb (b) for the porphyroblastic augen plagiogneiss in the Dashegou tungsten orefiled (base map after ref.[90])

Fig.14 Schematic model for Late Ordovician-Early Silurian tectono-magmatic evolution in the Qinling Orogen (modified from ref.[4])