Modern Southern Junggar Foreland Basin System Adjacent to the Northern Tian Shan, Northwestern China

Abstract Building-up of the modern Tian Shan range due to India-Eurasia collision induces flexural subsidence southern Junggar block. The sedimentary infill and in foreland basin recorded growth northern Shan. We analyze four seismic profiles, well logging data, trends stream morphology decipher its architecture, stratigraphic history. system can be divided into wedge-top, Lakes Aiby-Fangcao-Baijiahai foredeep Luliang forebulge backbulge depozones. profiles present active shortening structures wedge top northward thinning onlapping Neogene-Quaternary sequence foredeep. strata unconformities separating pregrowth upper part are identified depozone. This indicates that competition between local folding relief regional bedrock determines erosion versus deposition top. data GQ2 reveal wedge-top depozone evolved from distal lake sedimentation, probably a setting, braided river piedmont setting. These lines evidence migration process driven by propagation since Neogene. north-northeast dipping topography thrust controls north-northeastward flowing all rivers top, these rivers’ direction changes where tectonic landform flatten out. Growth anticlines front may have triggered meandering channel Manas lower reach. transition depozones suggests control on morphology.