Abstract:

The thrust tectonic belts in the south margin of the Tianshan Mountains were region-ally controlled by N-S horizontal compressing stress field,thus forming E-W stretching fold-faulted tectonics.Those are macroscopically characterized by fan or reverse fan shapes.The belts could be divided into three kinds:1.thrusts mainly formed in Hercynian and distributed in the south flank of the Halicktao anticlinorium;2.imbricate tectonics formed in Indosinian-Yenshan Epoch and distributed in the fore part of south Tianshan;3.nappe tectonics characterized by thrusting up to several kilometres along sliding planesat low angles,developed in Himalayan Epoch and distributed in foreland depressions and the neighbouring inter montane basins.It is a intensive reformation to the thrust tectonics of the Hercynian and Indosinian-Yenshan Epoches.