Sandbox Modeling of Transrotational Tectonics With Changeable Poles: Implications for the Yinggehai Basin

The main formation of the Yinggehai Basin has been related to rotation Indochina block, resulting in large-scale strike-slip motion along Red River Fault Zone (RRFZ). Transrotational tectonics played a key role evolution Basin. In this study, we present analog experiments with preexisting basal velocity discontinuity boundary, crustal blocks concerning vertical axes, and syntectonic sedimentations evaluate how transrotational controls evolutionary process Particle image velocimetry (PIV) was used monitor deformation model surface. Four successive poles have applied model. basin underwent two phases. An early phase is characterized by nucleation internal faults above boundary segmented en echelon border fault systems. phase, mainly accommodated displacement. During progressive extension, deactivated, tectonic activity localized secondary late phase. rotating block play dominant widening deepening rift zone at an accelerating rate. surface morphology shows similarities Basin, which wide middle converges toward northwest southeast. addition, experimental profiles compared seismic results also indicate that combines strong motion. between modeling nature provide support for ∼250 km sinistral displacement RRFZ ∼32 ∼21 Ma.