摘要
The nearly simultaneous emplacement of Mazhatarger basic-intermediate-acidic magma suite is proved by the outcrop evidence.Zircon SHRIMP U-Pb age of the quartz syenitic porphyry dyke from Mazhatarger is 273.0±3.7Ma.The above ages show the similarity of emplacement times of basic,intermediate and acidic magmas from the Bachu area,which is about in 275 Ma.Based on lhe published high-accuracy ages, it is proposed in this paper that the Tarim Large Igneous Province has a magmatism lifespan of~20Myrs.The flood basalt, which is thought to erupt mainly in 291~287 Ma,constitutes the major pulse of the Tarim LIP and should be generated by partial melting of a plume head.