The comparative studies on basalt dykes and dibase veins emplaced either in Qigebulak Formation （Z2q） of the Upper Sinian at Xianerbulak of Aksu, northwestern or Malieziken Group of the Early Ordovician at Qiate, southwestern Tarim, with a regard to field characteristics, geochemical analysis, and zircon SHRIMP U-Pb dating ages, yields constraints on magmatic activities. The former one is of characteristic of intrusion along the stratum with acidic xenoliths inclusion, similar to the features of basalts, such as the pillow structure, spherical weathering and columnar joints; while the latter has intruded into the ductile shear zone in the carbonate mylonitization. Both basalt dykes and dibase veins varies in the great contents with 36.3%～45.3% for 9 major geochemical composition exception for the contents of SiO2 , Na2O+K2O = 3.83% ～7.16% , TiO2 = 0.63% ～1.89% ; MgO = 3.72% ～6.74% ; compare with that of the latter dibase dykes. The former one are rich in the major composition, trace elements such as Sr, Ta, Nb, Ti, Yb, Ni, Cu, Zn, Y; depleted in the large ions and lithophile and petrogenetic element of Cs, Rb and the element ratios of La/Nb, K/Tl. However, both of them enriched in lithophile and petrogenetic elements of Li, Rb, Ba, Ga, Sr and rare elements of Nb,Ta; moderate richness light rare elements, depleted in Cr, Co iron family elements and Mo, Pb, Bi, U elements. The former basalt dykes is of REE = 227.72×10 -6～426.32×10-6 , L/H = 2.51～2.61, δEu = 0.48～0.52, δCe = 0.56. The latter dibase veins REE = 142.37×10 -6 ～187.92×10-6 , L/H = 2.34～3.99, δEu = 0.63～0.84, δCe = 0.52～0.54; comprehensive judgement indicated that the former basalt dykes origin mantle source without or weak lithosphere contamination, associated with the activities of deep faults in extensional intraplate setting; and the later connected with ductile shear in back-arc basin. The ages recorded by magmatic zircon SHRIMP U-Pb dating is 878～808.6 Ma for basalt dykes in Qigebulak Formation（Z2g）erupted in the new Proterozoic, association with the breakup and assembly of Rondina supercontinent; and 478±48 Ma for dibase veins emplaced in Malieziken Group, emplaced in the Late Ordovician. In addition, there are the other two ages for basalt dykes emplaced in Qigebulak Formation （Z2g）; one of concordia ages 2 090 Ma indicating of forming of columbia supercontinent; the other is 455.4±10.8 Ma, recording the age of hydrothermal alteration of magmatic activities in the Middle and Late Caledonian.
Qian Yixiong Zhang Hongan Yang Shengbin Li Huili Lei Ming Chen Yue Jia Cunshan Shao Zhibing. The age and tectonic settings constraint on the basalt dykes and dibase veins in the western Tarim[J]. Chinese Journal of Geology, 2017, 52(4): 1079-1096.