The Irtysh Shear Zone is a major tectonic boundary in the Central Asia Orogenic Belt.
Three episodes of late Paleozoic deformation (D1–D3) were recognized.
D1–D3 were associated with convergence of arc systems.
D1–D3 represent orogenic thickening, collapse and transpressional deformation.
D3 was possibly reactivated in the Mesozoic to Cenozoic.