Abstract:Detailed stratigraphy and provenance analysis have been conducted in the Jurassic Shiguai Basin, with aims at constructing the basin’s depositional architecture and facies distribution, tracing provenance’s tectonic position and uplifting history, and finally discussing the Jurassic geomorphic evolution in the Daqing Mountains area.Methods: Conventional sedimentological methods were applied in this study, including detailed logging in six available sections, restoring paleo-drainage system, and calculating detrital/gravel composition in sandstones and conglomerates. Based on these works, along with published studies of growth strata, isotopic dating and structural deformation, depositional architecture and facies distribution can be well reconstructed.Conclusions:The Shiguai Basin is the most well-preserved Jurassic basin among the Yinshan Mountains belt, whose depositional process and detrital composition document the Jurassic geomorphic evolution of the Daqing Mountains area. The Lower Jurassic Wudanggou Fm. and the Middle Jurassic Zhaogou Fm. constitute the lower part of the basin fill, and record an extensional setting. During the initial rifting, southern part of the basin deposited coarse-grained alluvial fan system duo to adjacent steep topography, and gravel composition within these deposits reveals the unroofing process of proximal high-grade metamorphic terrane. The late stage of rifting was characterized by thermal subsidence, and meanwhile the flooding surface reached its maximum. During the same interval, material sourced from sedimentary rocks increased markedly in the Zhaogou Fm., indicating the ongoing deplanation and the corresponding tectonic quiescence. After then, the Late-Middle Jurassic saw a tectonic inversion occurring in the Daqing Mountains area. This event formed the nearly E-trending Daqing Mountains fold-and-thrust belt which involved the southern part of the previous rifting basin into compressive deformation. However, these young structures were probably blind and their actives seemed not to cause obvious uplifting. On the contrary, basin’s northern margin denudated dramatically at the same time, as evidenced not only by the marginal deposition of the Changhangou Formation and Daqingshan Formation merely occurring in the northern part of the Shiguai Basin, but also by alternative unroofing of the deep and shallow materials in the Yinshan Mountains belt. This character that the north terrane uplifted higher than the south, could be attributed to the reactivation of regional faults beside the Yinshan Mountains belt, and also can be considered as remote response to the Late Mesozoic multi-plate convergence in East Asia.