///Bensongcuo batholith occupies an area of over 1 800 km2 and is the greatest granite multiple batholith in central Qiangtang. Geochemical studies indicate that monzogranites are high-potassium peraluminous calc-alkaline granites formed in collisional tectonic setting, similar to other Indosinian intermediated-acid rocks in this area. The intermediated-acid rocks compose the collisional or post-collisional magmatic arc of the Lungmu Co-Shuanghu-Lancang River suture zone. Moreover, 40Ar-39Ar dating was carried out for biotites from the granite gneiss and the dating results show that the granitic gneiss resulted from the reformation of Indo-Chinese granites by Jurassic magmatism at (175.8±1.1) Ma, and hence the Bensongcuo batholith should serve as the material record of multi-stage intrusion of intermediate-acid magmatic rocks.oft-com:office:office" />