Factors controlling early stage salt tectonics at rifted continental margins and their thermal consequences

摘要: [1] We use 2-D thermomechanical models to investigate the early evolution of rifted margin salt tectonics in terms competition among tilt, flow, and sediment aggradation. Model experiments include initial geometry autochthonous basin, subsequent synrift thermal subsidence, water loading, compaction. We also calculate system impact high conductivity (halite). Set 1 demonstrates a two-phase response deposition: short-term equilibration between crust longer-term relaxation which basin image penetrates depth on order its width. 2 addresses 3 examines other factors, width depth, width, potentially affect evolution. 4 shows that sawtooth subsalt topography, representing faulted basement grabens, does not strongly impede flow. The model results are discussed ternary diagram with apices sedimentation rates. Characteristic styles following: (1) tilt rapid flow draining distal before aggrades, (2) an equivalent faster aggradation captures as diapirs minibasins, (3) diapir-minibasins systems develop drains. Thermal consequences these discussed. A preliminary comparison structures resembling occur southwest Nova Scotian margin.