Origin of Late Mesozoic igneous rocks in Southeastern China: implications for lithosphere subduction and underplating of mafic magmas

摘要: Abstract On the basis of geological, geochemical and geophysical data Late Mesozoic igneous rocks in SE China, we suggest that during period from 180 to 80 Ma, slab dip angle Paleo-Pacific plate subduction underneath China increased a very low median angle. Consequently, magmatic activity continental margin migrated oceanward southeast. Initially, magmatism was concentrated region as far 800∼1000 km northwest ocean–continent boundary zone, which is located eastern flank Central Ranges, Taiwan. As increased, this belt rapidly only 100–200 km away zone. During process, various degrees mantle wedge melting basaltic underplating provided necessary heat cause partial lower- middle- crust, generation voluminous felsic magmas. A combination these processes responsible for formation famous Yanshanian granitoids, volcanic related ore deposits China. Mantle input may have played an important role sustaining magma fractionation eventually leads release fluids world class W, Sn other types