Qin, K.Z.Su, B.X.Sakyi, P.A.Tang, D.M.Li, X.H.Sun, H.Xiao, Q.H.Liu, P.P.2019-05-032019-05-032011-06DOI: 10.2475/03.2011.03Vol.311(3): pp 237-260http://ugspace.ug.edu.gh/handle/123456789/29775Zircon SIMS U-Pb dating of the Poshi, Hongshishan, Bijiashan, and Huangshan Ni-Cu-bearing and Xiangshan Ni-Cu-Ti-Fe-bearing mafic-ultramafic intrusions in the Eastern Tianshan and Beishan Rift yields a relatively restricted range of 278.6 Ma to 284.0 Ma. The histogram of compiled age data of basalts in the Tarim Basin and mafic-ultramafic intrusions in the Eastern Tianshan and Beishan Rift has a peak of 280 Ma, which probably represents the time of mantle plume activity. The basalts have lower εNd(t) values in the range of -9.2 ~ -1.7 and Mg# of <50, and higher TiO2 contents (>2 wt.%), indicating that they were generated directly from a peripheral zone of the mantle plume by low degree of melting. The mafic-ultramafic intrusions have higher εNd(t) of -1.3~11.2 and Mg# of 33~90, and lower TiO 2 < 1.8 weight percent, suggesting that their parental magmas were produced from lithospheric mantle source by high degree of melting due to higher temperature of the mantle plume head. A possible mantle plume model beneath lithospheric mantle of the Tarim Basin, Tianshan and Beishan and its spatial framework is suggested.enBeishan RiftEastern TianshanLarge igneous provinceMantle plumeNi-Cu-bearing mafic-ultramafic intrusionTarim BasinArticle