The Sikouzi Basin，located near Guyan in Ningxia Hui autonomous region，deposited the huge thick layer of Cenozoic strata，which document the characteristics of sedimentary evolvement and history of tectonic deformation. Based on analyzes of grain size，sedimentary structures and sedimentary sequence，twenty lithofacies and five sedimentary environments are recognized. By correlating previous magnetic straitigraphic result and our present analysis of sedimentary evolution and its response to tectonics，we suggest that the basin was slowly depressed before 20.1 Ma and was deformed in 1.2 Ma. Between 20.1 Ma and 1.2 Ma，three tectonic uplift events took place in the northeast of QinghaiTibet Plateau. They happened in the 6.4 Ma， 4.6 Ma and 1.2 Ma. Basin stratigraphy shows that the tectonic uplift at 6.4 Ma is the first time that growing of the northeastern QinghaiTibet Plateau affected the east region of HaiyuanLiupan Shan faulting. Both the style of development and the evolution of the Sikouzi Basin uncover that the Late Cenozoic thrusting of the Madong Shan front fault system led to the following evolution pattern. The Sikouzi Basin was strongly deformed and uplifted，and then most of the basin was merged into marginal plateau and consequently became the newest part of the QinghaiTibet Plateau.
. Cenozoic sedimentary evolution of the Sikouzi Basin |on the northeastern margin of the QinghaiTibetan Plateau and its tectonic significance[J]. Chinese Journal of Geology, 2010, 45(02): 440-452.