Petrogenesis of Neoproterozoic adakitic tonalites and high-K granites in the eastern Songpan-Ganze Fold Belt and implications for the tectonic evolution of the western Yangtze Block

The Gongcai and Qinganlin plutonic complexes in the Danba Domal Terrane, eastern Songpan-Ganze Fold Belt, consists of ca. 860 Ma adakitic tonalities and ca. 830 Ma high-K granites, respectively. Samples from the Gongcai complex have variable SiO2 (66.7–72.1 wt%), high Al2O3 (14.3–17.7 wt%), low alkalis (5.71–7.07 wt%), and high Sr (576–1309 ppm) and low Y (2.2–10.4 ppm) contents, similar to typical adakites. The Qinganlin complex possesses...