Abstract:Basement rocks from drill cores at the northeastern margin of the Ordos Basin are mainly composed of meta sedimentary rocks. LA ICP MS U Pb zircon dating was conducted on two basement metamorphic rocks and yielded 96 valid data. A two mica plagiogneiss yielded a restricted range of the magmatic zircon ages from 18982 Ma to 20472 Ma, which suggest the possible existences of a Paleoproterozoic intensive magmatic episode. A two mica plagiogneiss and a sillimanite gneiss were overprited by two metamorphic events at ca.183Ga and ca. 178Ga. The ages and characters of the zircons indicate that the basement of the northeastern Ordos Basin had undergone two metamorphic events at Late Paleoproterozoic. The ca. 183Ga metamorphic event indicates the northeastern Ordos Basin joined the final amalgamation of the NCC, while the ca. 178Ga was probably a result of terrane uplift or regional extension.