Fig.1 Sketch map of the South China and Indosinian blocks ((a), modified from reference [31]) and simplified geologic map of southwestern Guangxi ((b), modified from references[24, 32])

Fig.2 Field and hand specimen photos of the study area

Fig.3 Microscopic photographs of sample 18DX-02 ((a), crossed polar; (b), plane polar) and sample 18JZ-01 ((c), crossed polar; (d), plane polar)

Fig.4 CL images (a)(c)(e) and zircon U-Pb concordia diagrams (b)(d)(f) of volcanic rocks from the study area

Fig.5 TAS ((a),modified from reference [44]) and SiO2 vs. K2O ((b),modified from reference[45]) diagrams of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi

Fig.6 A/CNK vs. A/NK ((a), modified from reference [46]) and ACF ((b), modified from reference[47]) diagrams of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi

Fig.7 Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized multi-element diagram (b) of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi

Fig.8 t vs. εNd(t)((a),modified from reference[58])and (87Sr/86Sr)i-εNd(t) ((b),modified from reference[59]) diagrams of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi

Fig.9 δEu vs. (La/Yb)N((a),modified from reference[65]) and La vs. La/Sm ((b),modified from reference[66]) diagrams of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi

Fig.10 C/MF vs. A/MF diagram of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi (modified from reference[67])

Fig.11 R1-R2 diagrams of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi(modified from reference[87])

Fig.12 Tectonic discrimination diagrams of (Y+Nb)-Rb ((a),modified from reference [88]) and SiO2-Fe2O3T/(Fe2O3T +MgO) ((b), modified from reference[89]) of the Early Mesozoic felsic volcanic rocks from southwestern Guangxi